CSA22-2-120_R2004

National Standard of Canada CAN/CSA-C22.2 No. 120-M91

Refrigeration Equipment

Prepared by Canadian Standards Association

Approved by Standards Council of Canada

ISSN 0317-5669 Published in September 1991 by Canadian Standards Association

178 Rexdale Boulevard, Rexdale (Toronto), Ontario, Canada M9W 1R3

Copyright Canadian Standards Association Reproduced by IHS under license with CSA

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S S

(Reaffirmed 2004)

The Canadian Standards Association, which operates under the name CSA International (CSA), under whose auspices this National Standard has been produced, was chartered in 191 9 and accredited

by the Standards Council of Canada to the National Standards system in 1973. It is a not-for-profit, nonstatutory, voluntary membership association

engaged in standards development and certification activities.

CSA standards reflect a national consensus of producers and users — including manufacturers, consumers, retailers, unions and professional organizations, and governmental agencies. The standards are used widely by industry and commerce and often adopted by municipal, provincial, and federal governments in their regulations, particularly in the fields of health, safety, building and construction, and the environment.

Individuals, companies, and associations across Canada indicate their support for CSA's standards development by volunteering their time and skills to CSA Committee work and supporting the Association's objectives through sustaining memberships. The more than 7000 committee volunteers and the 2000 sustaining memberships together form CSA's total membership from which its Directors are chosen. Sustaining memberships represent a major source of income for CSA's standards development activities.

The Association offers certification and testing services in support of and as an extension to its standards development activities. To ensure the integrity of its certification process, the Association regularly and continually audits and inspects products that bear the CSA Mark.

In addition to its head office and laboratory complex in Toronto, CSA has regional branch offices in major centres across Canada and inspection and testing agencies in eight countries. Since 1 91 9, the Association has developed the necessary expertise to meet its corporate mission: CSA is an independent service

organization whose mission is to provide an open and effective forum for activities facilitating the exchange of goods and services through the use of standards, certification and related services to meet national and international needs. For futher information on CSA services, write to CSA International 1 78 Rexdale Boulevard Toronto, Ontario, M9W 1 R3 Canada

CSA INTERNATIONAL

The Standards Council of Canada is the coordinating body of the National Standards system, a federation of independent, autonomous organizations working towards the further development and improvement of voluntary standardization in the national interest.

The principal objects of the Council are to foster and promote voluntary standardization as a means of advancing the national economy, benefiting the health, safety, and welfare of the public, assisting and protecting the consumer, facilitating domestic and international trade, and furthering international cooperation in the field of standards.

A National Standard of Canada is a standard which has been approved by the Standards Council of Canada and one which reflects a reasonable

agreement among the views of a number of capable individuals whose collective interests provide to the greatest practicable extent a balance of representation of producers, users, consumers, and others with relevant interests, as may be appropriate to the subject in hand. It normally is a standard which is capable of making a significant and timely contribution to the national interest.

Approval of a standard as a National Standard of Canada indicates that a standard conforms to the criteria and procedures established by the Standards Council of Canada. Approval does not refer to the technical content of the standard; this remains the continuing responsibility of the accredited standards-development organization.

Those who have a need to apply standards are encouraged to use National Standards of Canada whenever practicable. These standards are subject to periodic review; therefore, users are cautioned to obtain the latest edition from the organization preparing the standard. The responsibility for approving National Standards of Canada rests with the Standards Council of Canada 45 O'Connor Street, Suite 1 200 Ottawa, Ontario, Ki P 6N7 Canada

National Standards of Canada are published in English and French.

Although the intended primary application of this Standard is stated in its Scope, it is important to note that it remains the responsibility of the users to judge its suitability for their particular purpose.



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General Instruction No. 1 CAN/CSA-C22.2 No. 120-M91 September 1991 CSA Standard CAN/CSA-C22.2 No. 1 20-M91, Refrigeration Equipment, consists of 95 pages, each dated September 1991.

This Standard, like all CSA Standards, is subject to periodic review, and amendments in the form of replacement pages may be issued from time to time; such pages will be mailed automatically to those purchasers who complete and return the attached card.* Some Standards require frequent revision between editions, whereas others require none at all. It is planned to issue new editions of the Standard, regardless of the amount of revision, at intervals not greater than 5 years. Except in unusual circumstances, replacement pages will not be issued during the last year of that edition. * This card will appear with General Instruction No. 1 only.

Although any replacement pages that have been issued will be sold with the Standard, it is for the purchaser to insert them where they apply. The responsibility for ensuring that his or her copy is complete rests with the holder of the Standard, who should, for the sake of reference, retain those pages which have been replaced. Note: A General Instruction sheet will accompany replacement pages each time they are issued and will list the latest date of each page of the Standard.

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urn... .......O.,,. on sun ussus..usuuuu.n.rn.........g

Name ________ Organization

Address

lty

Prov./State

Country ___________ CSA Standard Postal/Zip Code CAN/GSA -C22.2 No. 120-M91



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Canadian Standards Association Consolidated Mailing List 178 Rexdale Blvd. Rexdale (Toronto), Ontario Canada M9W 1R3

Place

Stamp Here



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General Instruction No. 2 CAN/CSA-C22.2 No. 120-M91 May 1992

CSA Standard CAN/CSA-C22.2 No. 120-M91, Refrigeration Equipment, was published in September 1991; it consisted of 95 pages, each dated September 1991.

Errata to Clauses 4.8.3, 4.9.1, 4.10.2, 4.11.3, 4.11.4, and 6.11.5 are incorporated (and identified by a vertical line in the margin) in the attached replacement pages.

CSA Standard CAN/CSA-C22.2 No. 120-M91 now consists of the following pages: 3—24, 31-66, and 69-95 dated September 1991; and 25-30, 67, and 68 dated May 1992. These replacement pages are to be inserted into your copy of the Standard; the pages replaced should

be kept for reference.



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4.7.8.2 Where Table 4 references this Clause, a cabinet or enclosure intended for outdoor use shall be provided with one of the following coatings: (a) Hot dipped mill galvanized sheet steel having the coating designation G90 in Table 1 of ASTM Standard A525, with not less than 40% of the zinc on any side, as determined by the minimum single spot test requirement in this ASTM Standard. The weight of zinc coating may be determined by any recognized method; however, where results are in question, the weight of coating shall be established in accordance with the test method of ASTM Standard A9 0; (b) A zinc coating, other than that provided on hot dipped mill galvanized sheet steel, uniformly applied on each surface to an average thickness of not less than 0.01549 mm (0.000610 in), and to a minimum thickness of 0.01372 mm (0.00054 in); or (C) A zinc coating complying with Item (a) or (b) of Clause 4.7.8.1, plus one coat of outdoor paint as specified in Item (C) of Clause 4.7.8.1 on each surface. 4.7.8.3 Other finishes, including paints, special metallic finishes, and/or a combination of the two, may be accepted provided that the resultant finish provides equivalent protection to that of galvanized steel as specified in Clauses 4.7.8.1 or 4.7.8.2 as applicable.

4.7.8.4 Metals shall not be used in combinations such as to cause galvanic action that will adversely affect cabinets or enclosures.

4.7.9 Construction of Enclosures, Outdoor Use Equipment

4.7.9.1 The outer cabinet of the equipment intended for outdoor use shall be so constructed as to prevent the wetting of uninsulated live parts and shall protect the system against shock hazard due to exposure to rain, and shall comply with the rain test in Clause 6.18.

4.7.9.2 Service covers and access panels that are not secured by screws or other fasteners that require the use of tools to remove them, shall be left open or removed during the rain test, Clause 6.18.

4.7.9.3 An enclosure for electrical components shall have provision for drainage if the enclosure employs knockouts or unthreaded openings. The drainage holes shall be not less than 3.2 mm (1/8 in) diameter or drainage openings of at least equivalent size shall be included.

4.7.9.4 Nonmetallic materials used for the cabinet and gaskets for electrical parts and wiring in equipment for outdoor use shall not be adversely affected by atmospheric temperature changes and shall resist the effects of exposure to sunlight or rain if they are

CAN/CSA—C22.2 No..120—M91 — May 1992 — Page 25 (Replaces p. 25, September 1991)



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located so as to be exposed to these conditions.

4.7.9.5 Where gaskets are employed in order for enclosures of electrical components to comply with the rain test of Clause 6.18, the gasket material shall comply with Clause 6.19.

4.7.10 Field Wiring, Outdoor Use Equipment Conduit openings or knockouts shall be provided for all field wiring connections, and shall be at least 22.2 mm (7/8 in) diameter. Threaded openings shall be provided unless the location of the openings (a) is wholly below the lowest uninsulated live part within the enclosure; or (b) prevents drainage into the enclosure along the outside surface of a field—supplied wireway; or (c) is such that the routing of the factory— or field—supplied wiring forms a drip—loop which physically prevents any entering moisture from reaching uninsulated live parts.

4.8 Safety of Refrigerating System

4.8.1 Refrigerants shall be one of the types listed in CSA Standard B52.

4.8.2 Refrigerant—containing components shall comply with the requirements of CSA Standard C22.2 No. 140.3, and shall have design pressure rating suitable for the application.

4.8.3

Except for components and pressure vessels required to comply with CSA Standard B52, refrigerant—containing components shall meet the requirements of Clause 4.8.2 and shall withstand, without failure, a pressure equal to not less than five times the maximum normal working pressure or three times the maximum abnormal working pressure, whichever is greater, as determined by Clause 49.

4.8.4 Pressure vessels that are required to comply with CSA Standard B52 shall have a working pressure of at least the design pressure of the equipment as specified in Clause 4.9.3.

4.9 Determination of Maximum Working Pressures

4.9.1 Normal For the purpose of Clause 4.8.2, the maximum normal working pressures shall be as follows: (a) or high side parts, the highest of the following:

(1) The condensing pressure when the equipment is operated under the most severe condensing conditions for which it is intended, but in any case for equipment with an air-cooled condenser, at a condenser air inlet temperature of not less than 40°C (104°F), and for equipment with a water—cooled condenser, at condenser water temperatures not less than 26.7°C (80°F) at the inlet and 37.8°C (100°F) at the outlet; and under the most severe

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evaporator conditions for which it is intended (see Clause 6.2); Note: In determining the most severe load conditions the testing authority relies on published statements by the manufacturer, including marking of equipment to show conformity with trade association performance standards.

(ii) Minimum design pressure specified in CSA Standard B52, Table 5.3 (see Appendix B);

(iii) The condensing pressure of water—cooled equipment that does not have a pressure limiting device, if the water flow is stopped;

(iv) The design pressure marked on the equipment, if it exceeds that required by Clause 4.9.3. (b) For low side parts, the highest of the following:

(i) The evaporator pressure when the equipment is operated as specified in (a)(i) above;

(ii) The vapour pressure of the refrigerant at 21.1°C (70°F); (iii) The evaporation pressure when exposed to some design

temperature above 21.1°C (70°F); (iv) The minimum design pressure specified in CSA Standard

B52, Table 5.3 (see Appendix B); (v) The design pressure marked on the equipment, if it

exceeds that required by Clause 4.9.3; (vi) The evaporator pressure that results when a bulk milk

cooler of the direct expansion type is washed with water at 90°C (194°F). Note: For convenience, this pressure can be assumed to be the saturated vapour pressure of the refrigerant at 90°C (194°F).

4.9.2 Abnormal Maximum abnormal working pressure shall be as follows: (a) For high side parts. The pressure developed in temperature (abnormal) operation tests (see Clause 6.11). (b) For low side parts. The highest of the following:

(i) The low side pressure developed in the condenser fan failure (see Clause 6.11.1) or the condenser water failure (see Clause 6.11.2) including the pressure that results when the compressor stops;

(ii) The setting or rating of a pressure relief or rupture member fitted in the low side; (iii) If the high side operating pressure is limited by a

pressure relief valve that is vented into the low—pressure side of the system, the value of low side pressure that results from the action of the pressure relief valve;

(iv) The maximum low side pressure that results when the action of the compressor of a bulk milk cooler of the direct expansion type is stopped at any point during the normal operating cycle, including a period during which it is being filled, as noted in Clause 6.2.6.2 and a period during which it is being washed with water at 90°C (194°F).

4.9.3 The high and low side design pressures to be marked on equipment (see Clause 5.3(f)) shall be not less than the highest of the following: (a) The maximum normal working pressure as determined in Clause 4.9.1; or

CAN/CSA—C22.2 No. 120—M91 — May 1992 — Page 27 (Replaces p. 27, September 1991) Copyright Canadian Standards Association

Reproduced by IHS under license with CSA Document provided by IHS Licensee=Intertek Testing Service/9989803100, 03/02/2005 01:55:00 MST Questions or comments about this message: please callthe Document Policy Group at 303-397-2295.

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(b) Three—fifths of the maximum abnormal working pressure, as determined in Clause 4.9.2.

4.10 Protection Against Excessive Pressure

4.10.1 Equipment shall have protective means such as a fusible plug, rupture member, or pressure relief valve, or shall be so constructed that some part of the system will safely relieve the pressure in case of fire. Acceptable pressure relief means include soldered joints in tubing, gasketed joints, and elastomeric insulators for terminals of hermetic compressors. Note: "Soldered joints" include joints made with various filler metals suitable for the base metals being joined and having nominal melting points between 204°C a.nd 426°C.

4.10.2 If the refrigerating system includes a liquid—containing pressure- containing component with an inside diameter of over 76 mm (3 in), but not over 152 mm (6 in), that can be isolated by valves from the other parts of the equipment, the pressure—containing component shall be protected by (a) a rupture member or pressure relief valve that will relieve the pressure at not more than 40% of the pressure defined in Clause 4.8.2 or 40% of the pressure it is capable of withstanding, as determined by the pressure test in Clause 6.1 of CSA Standard C22.2 No. 140.3; or (b) a fusible plug that does not exceed the relieving pressure specified in Item (a) above, provided that the critical pressure of the refrigerant used does not exceed the relieving pressure specified in Item (a) above or the saturation pressure of the refrigerant used at the temperature marked on the plug.

4.10.3 No stop valve shall be located between any pressure relief device or fusible plug and the part or parts of the system protected thereby.

4.10.4 All pressure relief means shall be connected adjacent to or directly to the pressure—containing component or parts of the system protected. Except as indicated in Clause 4.10.5, pressure relief devices shall be connected above the liquid refrigerant level, and installed to make them accessible for inspection and repair, and to protect them from conditions that could cause them to malfunction.

4.10.5 Fusible plugs may be located either above or below the liquid refrigerant level.

4.10.6 The size of the pressure relief device, if required, shall be determined in accordance with CSA Standard 352.

4.10.7 Pressure relief devices may discharge into the low—pressure side of

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the system, provided that they are not appreciably affected by back pressures, and provided that the low—pressure side of the system is equipped with its own pressure relief device. The low side pressure relief devices shall have capacity to protect either the pressure-containing components that are relieved into the low— pressure side of the system, or all pressure—containing components on the low side of the system, whichever relieving capacity is the greatest.

4.10.8 Except as specified in Clause 4.10.9, a pressure relief valve shall be sealed at a start—to—discharge pressure not exceeding the marked working pressure of the pressure—containing component it protects.

4.10.9 A pressure relief valve for a pressure vessel that does not have a marked working pressure shall be sealed at a start—to—discharge pressure that corresponds to no more than one—fifth of the ultimate strength of the pressure—containing component.

4.10.10 Where the pressure relief means is provided by a rupture member, the nominal rated rupture pressure of the member shall not exceed the marked design pressure of the vessel protected, or one—fifth of the ultimate strength of pressure—containing components that do not have a marked design pressure.

4.10.11 Rupture members shall burst at the pressure specified in CSA Standard C22.2 No. 140.3, Clause 6.3.

4.10.12 Fusible plugs shall operate at a temperature within 5.6°C (10°F) of the marked temperature rating when tested in accordance with Clause 6.2 of CSA Standard C22.2 No. 140.3.

4.10.13 A positive displacement compressor operating at pressures exceeding 103 kP (15 psig) and having a displacement exceeding 0.02 ma/s (50 ft 1mm) shall be equipped with a pressure relief device having the capacity and the pressure setting necessary to prevent rupture of the compressor. The pressure relief device shall be located between the compressor and the stop valve on the discharge side. Discharge from the device may be vented to the atmosphere or into the low-pressure side of the system.

4.11 Pressure Limiting Devices

4.11.1 A pressure limiting device shall be provided on all air—cooled and remote type equipment (a) having a liquid receiver capable of containing 9 kg (19.8 lb) or more of refrigerant without the liquid occupying more than 90% of the volume of the receiver at a temperature of 32°C (89.6°F); or (b) containing more than 10 kg (22 lb) of.refrigerant.

CAN/CSA—C22.2 No. 120—M91 — May 1992 — Page 29

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4.11.2 A pressure limiting device shall be provided on all equipment having a water—cooled condenser unless (a) the capacity of the liquid receiver at 32°C (89.6°F) does not exceed 1.4 kg (3.1 ib) if 90% of the available volume is filled with liquid; and (b) a compressor motor overload device will stop the action of the compressor before the pressure exceeds one—fifth of the high side pressure that the system is capable of withstanding without failure.

4.11.3

Except as specified in Clause 4.11.4, if the equipment has a pressure limiting device, the maximum pressure to which it may be set by the adjusting means shall not exceed 90% of the following, whichever is the smallest: (a) One—fifth of the pressure that the high side parts of the system are capable of withstanding without failure (see Clause 4.8.2); (b) The lowest marked design pressure of pressure—containing components used in the high side; (C) The setting of the pressure relief device, if any, in the high side of the system; or (d) The high side design pressure marked on the equipment. Note: The pressure limiting device may have a maximum pressure setting higher than specified above if the adjusting means on the device is locked in some manner to prevent the maximum adjustable pressure from being exceeded.

4.11.4 For a pressure limiting device installed on air—cooled equipment not required by Clause 4.11.1 to be provided with such a device, the device shall have a maximum adjustable cutout setting not exceeding (a) one—third of the pressure that the high side parts of the system are capable of withstanding without failure (see Clause 4.8.2); or (b) 90% of the setting of the pressure relief device, if provided.

4.11.5 The pressure limiting device shall stop the action of the compressor at a pressure no higher than the maximum setting specified in Clause 4.11.3.

4.11.6 There shall be no shut—off valves between the pressure limiting device and the pressure imposing element.

4.12 Water Heating Tanks

4.12.1 Water heating tanks shall comply with CSA Standard C22.2 No. 110.

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1 mm, the application of the following 60 Hz voltage between live parts and exposed non-current—carrying metal parts: (a) 1000 V for a circuit including a motor rated at less than 1/2 hp, and 250 V and less; (b) except as specified in Clause 6.10.2, 1000 V plus twice the rated voltage of the motor, for a circuit including a motor rated at 1/2 hp or larger, or more than 250 V; and (C) 500 V for a circuit rated 30 V or less. If an inductively coupled winding is included in the circuit being tested, the winding not in the test circuit shall be grounded. This test shall be made following each of the temperature tests

specified in Clauses 6.4 to 6.7.

6.10.2 If higher than rated potential is developed in the motor circuit through the use of capacitors, the rated voltage of the system is to be used in determining the potential to be used in the test in Clause 6.10.1(b), unless the measured steady—state potential (see Clause 6.3.5) exceeds 500 V, in which case the test potential shall be 1000 V plus twice the developed voltage.

6.11 Temperature (Abnormal Operation)

6.11.1 Condenser Fan Failure Equipment with an air—cooled condensing unit shall be fitted with pressure gauges on both the high and low side of the refrigeration system close to the compressor. When two or more condenser fan motors are used, the test shall be conducted with one motor locked. The unit shall be operated with the fan motor locked until maximum stabilized temperatures and high side pressures are reached or until representative maximum temperatures and pressures are attained under cycling conditions. If the equipment cycles on a compressor motor overload device, fan motor overload device, or automatic—reset type pressure control, the test shall continue until maximum high side pressures are obtained.

6.11.2 Condenser Water Failure Equipment with a water—cooled condensing unit shall be fitted with pressure gauges as indicated in Clause 6.11.1 and shall be operated with the condensing water shut off, and also with the condensing water restricted until the maximum stabilized temperatures are reached, or until representative maximum temperatures are attained under cycling conditions. If the equipment cycles on a motor overload device or automatic—reset type pressure control, the test shall continue until maximum high side pressures are obtained.

6.11.3 For equipment incorporating a manual—reset type pressure control that operates during the tests of Clauses 6.11.1 or 6.11.2, the test shall continue until maximum temperatures are attained for up to five resets of the control. The control shall be reset as soon as possible after it operates.

6.11.4 The equipment shall not exhibit hazardous pressures or temperatures or leak refrigerant during the tests described in Clauses 6.:Ll.1

CAN/CSA—C22.2 No. 120—M91 — May 1992 — Page 67.

(Replaces p. 67, September 1991) Copyright Canadian Standards Association Reproduced by IHS under license with CSA


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and 6.11.2.

6.11.5 The equipment is considered to comply with Clause 6.11.4 if (a) the refrigerant system does not rupture or develop leaks during the test. The maximum pressure recorded shall be used to determine the strength of all parts in the equipment in accordance with Clause 4.8.2; (b) the maximum temperature of the compressor motor enclosure does not exceed 150°C (364°F); (C) the winding temperature of the fan motor having an inherent overheating protective device does not exceed the value permitted by CSA Standard C22.2 No. 77; and (d) the maximum temperature of the fan motor enclosure does not exceed 150°C (364°F).

6.11.6 Other Components Equipment shall comply with Clause 6.11.7 when operated under any abnormal load conditions liable to occur in service, such as (a) failure of a single component that may result in an intermittent duty relay or solenoid being energized continuously; (b) an electrically operated valve or solenoid becoming mechanically blocked in the deenergized position; (C) operation of an electric heater in air with the regulating thermostat adjusted to its maximum setting; Cd) operation of an electric storage tank heater with the water tank dry and the thermostat adjusted to its maximum setting; and (e) operation of an electric forced—air heater (such as an evaporator fan motor and defrost heater), if the fan motor operates during heater operation. The fan motor shall be locked and the thermostat or other control device shall be set at the highest temperature condition. If more than one fan motor is used, the test shall be conducted by locking the fan motor causing the most severe condition (such as the motor farthest from the control device).

6.11.7 Emission of any flame or molten material from the equipment during these tests shall constitute failure. Opening of the supply circuit protection is not considered to be a failure if a fire hazard does not exist.

6.12 Control Equipment

6.12.1 Overload

6.12.1.1 To comply with Clause 4.29.1, motor control devices, except as specified in Clause 6.12.1.2, shall be capable of making and breaking the motor locked—rotor current 50 times without undue burning, pitting, or welding of the contacts and without either electrical or mechanical failure. If the contacts control another circuit in addition to the motor, that circuit or an equivalent load shall be included in the total test current.

CAN/CSA—C22.2 No. 120—M9l — May 1992 — Page 68 (Replaces p. 68, September 1991)



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Technical Editor: Norm Hendrycks Managing Editor: Bernard Kelly

Canadian Standards Association—i 991

All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior permission of the publisher.



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Technical Committee on Environmental Products 6

Subcommittee on C22.2 No. 120 7

Preface 8

Foreword 9

1. Scope 11

2. Definitions 12

3. General Requirements 15

Construction 18 General 18 Mechanical Strength 19 Protection from Fire Hazard 19 Protection from Shock Hazard 21 Doors and Covers of Enclosures 22 Protection from Mechanical Hazards 22 Mechanical Assembly 23

Safety of Refrigerating System 26 Determination of Maximum Working Pressures 26 Protection Against Excessive Pressure 28 Pressure Limiting Devices 29 Water Heating Tanks 30 Pressurized Product Systems 31

Freezing Chambers Under Pressure 31

Supply Connections 31

Permanently Connected Equipment 32 Field Wiring Terminals 33 Current—Carrying Parts 34 Strain Relief (Supply Cord) 34

Bushings 34 Electrically Operated Valves and Wiring 35 Types of Wiring 36 Electrical Insulation 40 Motors 40 Transformers 42 Electric Lighting Equipment 43

Incandescent Lighting Circuits 43 Electric—Discharge Lighting Circuits 43 Ballasts 44

Capacitors 45 Switches and Controls 46 Protection of Water Heaters 47 Heater Elements 47 Electric Defrost Heaters 48 Electric Grid Heaters 48 Electric Crankcase Heaters 49

Contents

4.

4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.14 4.15 4.16 4.17 4.18 4.19 4.20 4.21 4.22 4.23 4.24 4.25 4.26 4.27 4.27.1 4 . 27. 2 4.27.3 4.28 4 . 29 4.30 4.31 4.32 4.33 4.34

Solenoids 34

CAN/CSA—C22.2 No. 2C-M91 - September T..991 - ?e 3 Copyright Canadian Standards Association Reproduced by IHS under license with CSA


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4.35 Spacings 50 4.36 Separation of Circuits 52 4.37 Grounding and Bonding 53 4.38 Receptacles 53 4.39 Plumbing Requirements 53

5. Marking 53

6. Tests 57 6.1 General 57 6.2 Conditions for Normal Load Tests 58 6.2.1 Nonrefrigerated Equipment 58 6.2.2 Refrigerated Equipment 58 6.2.3 Drinking Water Coolers and Beverage Dispensers 59 6.2.4 Freezer Dispensers for Food and Beverage Products 61 6.2.5 Ice Making Machines 61 6.2.6 Milk Coolers 61 6.2.7 Absorption Type Refrigerators 62 6.3 Rating 62 6.4 Temperature (Normal Load) 62 6.5 Temperature (Ballasts and Wiring) 63 6.6 Temperature (Condensation Wiring) 64 6.7 Temperature (Defrost) 64 6.8 Insulation Resistance (Defrost Heaters) 65 6.9 Leakage Current 65 6.10 Dielectric Strength 66 6.11 Temperature (Abnormal Operation) 67 6.12 Control Equipment 68 6.12.1 Overload 68 6.12.2 Endurance 69 6.13 Starting 70 6.14 Flexing 71

6.15 Cabinet Strength 71 6.16 Physical Abuse (Enclosures) 72 6.17 Physical Abuse (Glass Assemblies) 73 6.18 Rain Test 73 6.19 Elastomeric Materials Deterioration Test for Gaskets and Adhesives 75 6.20 Moisture Absorption Resistance 75 6.21 Printed Circuit Boards (Abnormal) 76 6.22 Door Latch Release 76 6.23 Overflow 77 6.24 Strain Relief (Supply Cord) 77 6.25 Pressure Test for Water Heater Tanks 78 6.26 Pressure Tests 79 6.26.1 Pressurized Product Systems 79 6.26.2 Refrigerant-Containing Components 79 6.27 Limited Short Circuit (Inherent Motor Protective Devices) 79 6.28 Short—Circuit Test for Wiring 80

Tables 81

Figures 87

Appendices A——Minimum Design Pressures 93

CAN/CSA—C22.2 No. 120—M91 — September 1991 — Page 4 Copyright Canadian Standards Association Reproduced by IHS under license with CSA


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B—-Manufacturing and Production Tests 94 C——Determination of Minimum Circuit Arnpacity 95



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Technical Committee on Environmental Products

D.H. Dunsire Manitoba Hydro, Chairman

Winnipeg Representing Regulatory Authorities

R.L. Hicks Ontario Hydro, Vice-Chairman Toronto Representing Regulatory Authorities

D.W. Ritchie Canadian Standards Association, Standards Rexdale, Ontario Administrator,

Non voting

Representing Regulatory Authorities

D.G. Harley The City of Calgary Electric System, Calgary, Alberta

M. Riendeau Ministère du Travail du Québec, Montréal

Representing Producers

B.C. Christie Manville Canada Inc., Brampton, Ontario

G.L. Cornish Hewlett-Packard (Canada) Ltd., Ottawa, Ontario

J. Kube Chromalox Inc., Rexdale, Ontario

G. Longmuir Commander Electrical Equipment Inc., Scarborough, Ontario

Representing General Interests

R.L. Cane Caneta Research Inc., Consumer

Mississauga, Ontario Representativ

J. Gulino Canadian Standards Association, Rexdale, Ontario

W.J. Heeley Heating, Refrigerating and Air Conditioning Institute of Canada, Islington, Ontario

I. Pasini Public Works Canada, Ottawa, Ontario

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Subcommittee on C22.2 No. 120

N. Panabaker Hussmann Store Equipment Ltd., Chairman Brantford, Ontario

N.L. Beck Taylor Freezer, Rockton, Illinois, USA

T.W. Clark Canadian Curtis Refrigeration Ltd., Rexdale, Ontario

D.H. Dunsire Manitoba Hydro, Winnipeg

K.J. Emody Jet Spray Cooler Inc., Norwood, Massachusetts, USA

W. Flaska Tyler Refrigeration Corporation, Niles, Michigan, USA

R.I. Greenwald Ebco Manufacturing Company, Columbus, Ohio, USA

S.R. Griffin W.C. Wood Company Ltd., Guelph, Ontario

F. Oreskovich Keeprite Inc., Brantford, Ontario

R.J. Quatman Elkay Manufacturing Company, Lanark, Illinois, USA

M. Wagner Unif low Manufacturing Company, Erie, Pennsylvania, USA

G. Young Canadian Standards Association, Rexdale, Ontario

D.W. Ritchie Canadian Standards Association, Standards Rexdale, Ontario Administrator

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Preface

This is the third edition of CSA Standard C22.2 No. 120 (now CAN/CSA—C22.2 No. 120) and is a compilation of the basic requirements of five previous CSA Standards, namely (a) C22.2 No. 91, (1971) Drinking Water Coolers and Beverage Dispensers; (b) C22.2 No. 93, (1971) Freezer Dispensers for Food and Beverage Products; (C) C22.2 No. 120, (1974) Commercial Refrigerated Equipment; (d) C22.2 No. 132, (1973) Milk Coolers; and Ce) C22.2 No. 133, (1964) Ice Making Machines. After the effective date of this edition, the above standards

will be withdrawn. CSA Standard C22.2 No. 63, Household Refrigerators and Freezers,

was also used extensively as a reference document. The requirements of applicable Electrical Bulletins Numbers 1169

and 1311, Electrical Notice No. 568, and TIL N—22 are also incorporated into this document. This Standard was prepared by a subcommittee of the Technical

Committee on Environmental Products under the jurisdiction of the Standards Steering Committee on the Canadian Electrical Code Part II and was formally approved by these Committees. It has been approved as a National Standard of Canada by the Standards Council of Canada.

September 1991

Notes: (1) Use of the singular does not exclude the plural (and vice versa) when the sense allows. (2) Although the intended primary application of this Standard is stated in its Scope, it is important to note that it remains the responsibility of the users of the Standard to judge its suitability for their particular purpose. (3) CSA Standards are subject to periodic review, and suggestions for their improvement will be referred to the appropriate committee. (4) All enquiries regarding this Standard, including requests for interpretation, should be addressed to Canadian Standards Association, Standards Division, 178 Rexdale Boulevard, Rexdale, Ontario M9W lR3. Requests for interpretation, should

(a) define the problem, making reference to the specific clause, and, where appropriate, include an illustrative sketch; (b) provide an explanation of circumstances surrounding the actual field condition; and (c) be phrased where possible to permit a specific "yes" or "no" answer. Interpretations are published in CSA Information Update. For

subscription details and a free sample copy, write to CSA Sales Promotions or telephone (416) 747-4116.

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Foreword

Certification organizations, as accredited by the Standards Council of Canada, have their own criteria and procedures for certification services. The following paragraphs define CSA Certification policies.

The Canadian Standards Association provides certification services for manufacturers who, under license from CSA, wish to use the appropriate registered CSA Marks on certain products of their manufacture to indicate conformity with CSA Standards.

CSA Certification for a number of products is provided in the interest of maintaining agreed—upon standards of quality, performance, interchangeability and/or safety, as appropriate. Where applicable, certification may form the basis for acceptance by inspection authorities responsible for enforcement of regulations. Where feasible, programs will be developed for additional products for which certification is desired by producers, consumers or other interests.

In performing its functions in accordance with its objectives, CSA does not assume or undertake to discharge any responsibility of the manufacturer or any other party. The opinions and findings of the Association represent its professional judgement given with due consideration to the necessary limitations of practical operation and state of the art at the time the Standard is processed.

Products in substantial accord with this Standard but which exhibit a minor difference or a new feature may be deemed to meet the Standard providing the feature or difference is found acceptable utilizing appropriate CSA Certification Division Operating Procedures. Products which comply with this Standard shall not be certified if they are found to have additional features which are inconsistent with the intent of this Standard. Products shall not be certifiable if they are discovered to contravene applicable Federal laws or regulations. Testing techniques, test procedures and instrumentation

frequently must be prescribed by the CSA Certification Division in addition to the technical requirements contained in Standards of CSA. In addition to markings specified in the Standard the CSA Certification and Testing Division may require special cautions, markings and instructions that are not specified by the Standard.

Some tests required by CSA Standards may be inherently hazardous. The Association neither assumes nor accepts any responsibility for any injury or damage that may occur during or as the result of tests, wherever performed, whether performed in whole or in part by the manufacturer or the Association, and whether or not any equipment, facility or personnel for or in connection with the test is furnished by the manufacturer or the Association. Manufacturers should note that, in the event of the failure of

the CSA Certification and Testing Division to resolve an issue arising from the interpretation of requirements, there is an appeal procedure: the complainant should submit the matter, in writing, to the Secretary of the Canadian Standards Association. If this Standard is to be used in obtaining CSA Certification

please remember, when making application for certification, to request all current Amendments, Bulletins, Notices and Technical



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Information Letters that may be applicable and for which there may be a nominal charge. For such information or for further information concerning details about CSA Certification please address your inquiry to the Applications and Records Section, Canadian Standards Association, 178 Rexdale Boulevard, Rexdale (Toronto), Ontario M9W 1R3.

Publication Date--September 30, 1991. (ie, the date.on or after which this Standard may, at the discretion of the applicant, be used for certification).

Effective Date--March 31, 1993.* (ie, the date on which this Standard shall be applicable to equipment being submitted for certification and to equipment already certified and manufactured on or after that date). *Unless otherwise noted in the text or General Instruction.

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CAN/CSA—C22.2 No. 120—M9l Refrigeration Equipment

1. Scope

1.1 This Standard applies to self—contained and remote refrigeration equipment, designed to be installed and used inaccordance with the Canadian Electrical Code, Part I, for use in nonhazardous locations indoors or outdoors in commercial and business establishments.

1.2 This Standard also applies to self—contained, cord—connected equipment rated at not more than 250 V to be operated from branch circuits fused at not more than 60 A, and equipment intended for

permanent connection rated at 600 V and less.

1.3 This Standard applies to (a) refrigerated equipment such as display cases, meat, dairy, or frozen food cases, reach—in cabinets, wall cabinets, and bottle

type beverage coolers; (b) self—service or illuminated refrigerators, freezers and ice cream cabinets; (C) walk—in coolers; (d) equipment designed to be field—installed as part of a refrigeration system such as remote display cases and unit coolers; Ce) equipment designed to produce some degree of freezing of food or beverage mixtures and to dispense them at will from the equipment at the time of sale; (f) water coolers, pressure or bottle type, freestanding or wall— mounted having added features such as a means for heating water, or a refrigerated space; (g) refrigerated beverage dispensers for use in coimnercial establishments, designed for freestanding use or for building into fixtures; (h) coolers for raw milk intended for farm use, permanently connected, of the bulk direct expansion ice bank type having either a self—contained or remote condensing unit; (i) ice making machines that manufacture and harvest ice in cube, flake or other readily usable form and that may or may not incorporate ice storage means; Note: This Standard does not apply to automatic ice-makers that are accessory components in household refrigerators and freezers. (j) door and frame assemblies used as part of a refrigerated room or cabinet; and (k) other equipment used in conjunction with refrigerated equipment such as carbonators, ice dispensers, and nonrefrigerated display cases.

1.4 This Standard includes requirements for the electrical features of

equipment, having in mind the effects of sanitation procedures that may be required by authorities having jurisdiction in these



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matters, as well as the functional operation of the equipment, and requirements for the mechanical safety of refrigerating systems, water heating means, carbonating equipment, dispensing equipment, and door frame assemblies.

1.5 This Standard does not apply to compressor and condensing units covered by CSA Standard C22.2 No. 236.

1.6 The values given throughout this publication in SI (metric) units are the standard. The values given in parentheses are for information only.

2. Definitions

2.1 The following definitions apply in this Standard:

Accessories——components such as movable shelves, heated condensate pans, etc, that may be factory— or field—installed on the equipment.

Batch (impounded liquid) type beverage dispenser--equipment having a reservoir for liquid and constructed so that the liquid is cooled in the reservoir as a batch, regardless of whether any liquid is withdrawn.

Beverage dispenser——equipment comprising means for performing one or more of the functions of cooling, mixing, carbonating, and manual dispensing of beverages, and intended to be used in commercial establishments.

Class 2 circuit——a circuit having a voltage of not more than 30 V rms or 42.4 V peak and having limitations in accordance with the Canadian Electrical Code, Part I, Section 16.

Compressor motor—-a motor employed to operate a refrigeration compressor.

Condensing unit--a specific refrigerating machine combination for a given refrigerant, consisting of one or more power—driven compressors, condensers, liquid receivers (when required), and the regularly furnished accessories.

Control circuit——a low voltage circuit that carries electric signals directing the performance of a controller which, in turn, governs power delivered to a motor or other load in the equipment. A control circuit does not carry main power current. A control circuit may be either (a) Direct—connected—-a control circuit that is supplied directly from a branch circuit separate from the circuits supplying other loads within the equipment; or

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(b) Tapped——a control circuit that is tapped within the equipment from the load side of the overcurrent device for the controlled load.

Design pressure——the maximum allowable working pressure, kPa (psig), for which a specific part of a system is designed.

Drinking fountain—-equipment designed to dispense potable water in a projected upward stream such that no intermediate device is required for drinking purposes. Note: For the purpose of this Standard, a drinking fountain may employ a remote type water cooler.

Electric grid--a hot—wire assembly designed to cut slab ice into cubes.

Enclosure——a part that by itself or in conjunction with barriers (a) renders inaccessible all or any parts that may otherwise present a risk of electric shock, (b) reduces the risk of mechanical hazards, or (C) prevents propagation of flame due to electrical disturbances occurring within. A cabinet may serve as an enclosure of electrical components or

wiring if routine maintenance, as outlined in the operation/user's manual of the equipment, does not require access to components enclosed by the cabinet.

Extra—low voltage--any voltage up to and including 30 V.

Freezer dispenser——equipment for the freezing of food and beverage mixtures (such as ice cream, frozen yogurt, slush ice) and dispensing of the frozen product at the time of sale. The equipment may include beater motors for continuous mixing of the frozen product and may include other systems such as product carbonation or mix storage.

Fusible plug——a device containing an alloy that will melt at a specified temperature and relieve pressure.

Heat exchanger——a device specifically designed to transfer heat between two physically separated fluids.

High side——the part of a refrigerating system under condenser pressure.

Ice making machine——equipment in which a refrigerating system is used directly in the freezing of water. Other mechanical or electrical means may be incorporated to manufacture or harvest ice in a usable form.

Low side——the part of a refrigerating system under evaporator pressure.

Milk cooler--a cooler that consists of a refrigerating system used for the bulk cooling of milk, and is rated for (a) everyday pickup (intended to cool a volume of milk equal to

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one—half the measured capacity of the cooler); or (b) every—other—day pickup (intended to cool a volume of milk equal to one—quarter the measured capacity of the cooler); The milk cooler may be one of the following types:

(a) Direct expansion type—-a cooler in which evaporator tubing is secured directly to the milk tank or the tank forms one side of the evaporator; or (b) Ice bank type——a cooler in which a bank of ice is formed for cooling of milk in bulk form or in cans.

Potable water-—water intended for human consumption.

Pressure—containing component——a refrigerant—containing vessel, such as a receiver, that does not meet the definition of pressure vessels.

Pressure limiting device-—a pressure—responsive mechanism designed to automatically stop the operation of the pressure—imposing element at a predetermined pressure.

Pressure relief device——a pressure—actuated valve or rupture member designed to relieve excessive pressure automatically.

Pressure relief valve—-a pressure—actuated valve held closed by a spring or other means and designed to automatically relieve pressure in excess of its setting.

Pressure vessel—-a closed vessel in which the pressure exceeds 103 kPa (15 psi) used for containing, storing, distributing, transferring, distilling, processing, or otherwise handling any gas, vapour, or liquid under pressure where one of the following limits is exceeded: (a) an internal capacity of 0.0425 m3 (1—1/2 ft3); or

(b) an internal diameter of 152 mm (6 in). The following vessels are not considered to be pressure vessels:

evapor9ors (eac separate section of which does not exceed

0.014 m (1/2 ft ) of refrigerant—containing volume), evaporator coils, compressors, condenser coils, controls, headers, pumps, and

piping. Pressure, unless otherwise stated, is expressed in kilopascals

above atmospheric pressure, ie, gauge pressure.

Pressurized product system—-equipment consisting of a pump, product tubing, and a tank for the pressurization of gas or liquid. The system may be part of or used in conjunction with other equipment such as beverage or freezer dispensers. Pressurized product systems include carbonation, water, or air systems.

Refrigerating system——a combination of interconnected refrigerant— containing parts constituting one closed refrigerant circuit in which a refrigerant is circulated for the purpose of extracting heat.

Remote system--a system consisting of a field-installed condensing unit situated at a location remote from the refrigerating unit.

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Self—contained system——a complete factory—made and factory—tested system, in a suitable frame or enclosurer that is fabricated and

shipped in one or more sections and has no refrigerant—containing parts connected in the field other than by companion or block valves.

Rupture member——a device that will rupture at a predetermined pressure.

Sealed compressor unit—-a compressor unit in which the compressor and motor are housed within a single container structure, or the motor is housed within a container structure integral with the compressor structure, so that the motor operates in a refrigerant atmosphere.

Sectional cabinet——a cabinet designed to be coupled to an adjoining cabinet during installation.

Unit cooler——a factory—made assembly that includes an evaporator coil, fan motors, and may include a defrost assembly, used for cooling purposes and intended for connection in a field-assembled

refrigerating system.

Water cooler——self—contained equipment designed for the sole

purpose of cooling potable water that may be drawn into vessels as required for drinking purposes in household, commercial, or industrial establishments. A water cooler may be either (a) Bottle type——a water cooler having a bottle or reservoir for water and constructed with a chamber in which the water is cooled

by entering the chamber from the reservoir in response to the withdrawal of water from the cooler. A bottle type water cooler is not intended for connection to a pressurized potable water source; or (b) Pressure type——a water cooler with or without attributes of a

drinking fountain, and/or glass filling capabilities, and having means for connection to municipal or other pressurized water source. Note: Water coolers not employing dispensing means are considered to be remote pressure type water coolers.

3. General Requirements

3.1 General requirements applicable to this Standard are given in CSA Standard C22.2 No. 0, General Requirements—-Canadian Electrical

Code, Part II.

3.2 Reference Publications

3.2.1 Where reference is made to CSA Standards of the Canadian Electrical

Code, Parts I and II, such reference shall be considered to refer to the latest editions and revisions thereto. This Standard refers

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to the following such Standards and the year dates shown indicate the latest editions available at the time of printing:

C22.l—1990, Canadian Electrical Code, Part I;

C22.2 No. O—M1982, General Requirements--Canadian Electrical Code, Part II;

C22.2 No. O.3—M1985, Test Methods for Electrical Cables and Wires;

C22.2 No. O.4—M1982, Bonding and Grounding of Electrical Equipment;

C22.2 No. O.6—M1982, Flammability Testing of Polymeric Materials;

C22.2 No. O.1l—M1985, Classification of Polymeric Compounds;

CAN/CSA—C22.2 No. O.15—M90, Adhesive Labels;

CAN/CSA C22.2 No. l—M90, Radio, Television, and Electronic Apparatus;

C22.2 No. 8—Ml986, Electromagnetic Interference Filters;

C22.2 No. 14—M1987, Industrial Control Equipment;

C22.2 No. 24—1987, Temperature-Indicating and -Regulating Equipment;

C22.2 No. 42—M1984, General Use Receptacles, Attachment Plugs and Similar Wiring Devices;

C22.2 No. 55—Ml986, Special Use Switches;

C22.2 No. 66—1988, Specialty Transformers;

C22.2 No. 72—M1984, Heater Elements;

C22.2 No. 74—1969, Lampholders and Control Equipment for Use with Electric Discharge Lamps;

C22.2 No. 94—1976, Special Purpose Enclosures 2, 3, 4 and 5;

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C22.2 No. 100—M1991, Motors and Generators;

CAN/CSA—C22.2 No. 11O—M90, Construction and Test of Electric Storage—Tank Water Heaters;

C22.2 No. 139—1982, Electrically Operated Valves;

CAN/CSA—C22.2 No. 140.2—M89, Hermetic Refrigerant Motor-Compressors;

C22.2 No. 140.3—M1987, Refrigerant Containing Components for Use in Electrical Equipment;

C22.2 No. 182.3—M1987, Special Use Attachment Plugs, Receptacles and Connectors;

CAN/CSA—C22.2 No. 236—M90, Heating and Cooling Equipment.

3.2.2 Where reference is made to the following publications such reference shall be considered to refer to that edition listed below:

CSA Standards CAN/CSA—B45 Series—88, CSA Standards on Plumbing Fixtures;

351—M1986, Boiler, Pressure Vessel, and Pressure Piping Code; 352—M1983, Mechanical Refrigeration Code;

CAN3—C235—83, Preferred Voltage for AC Systems 0 to 50 000 V.

ANSI/ASHRAE* Standard 34—1979, Number Designation of Retrigerants.

ASTMt Standards A90—81, Test Method for Weight of Coatings on Zinc Coated (Galvanized) Iron or Steel Articles;

A525—87, Specification for General Requirements for Sheet Steel Zinc Coated (Galvanized) Hot Dip Process.

ANSI/ULI Standard ANSI/UL No. 44—1985, Rubber-Insulated Wires and Cables.



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CGSB Standard 67—GP—7M—1978, Standard for Cotton, Absorbent Sterile or Nonsterile.

*erican National Standards Institute/American Society of Heating, Refrigeration, and Air Conditioning Engineers. tAmerican Society for Testing and Materials. +American National Standards Institute/Underwriters Laboratories Inc. Canadian General Standards Board.

4. Construction

4.1 General

4.1.1 Equipment shall be so designed and constructed as to provide protection against (a) the hazards of electric shock; (b) the hazards of electric fire; (C) the hazards of explosion; and

(d) other hazards as included in this Standard. Note: Requirements for protection against those hazards that are covered by federal or provincial authorities are not included in this Standard.

4.1.2 If corrosion of a metal part will contribute to or cause a hazard as stated in Clause 4.1.1, the part shall be protected against corrosion. (See Clause 4.7.8.)

4.1.3 Electrical components that are covered by other Canadian Electrical Code, Part II Standards shall be suitable for the intended applications, and shall comply with those requirements of the component Standard that are pertinent to the intended application.

4.1.4 Fibreglass thermal insulation shall not be used in areas where forced air movement could cause particles to be blown into food storage compartments.

4.1.5 Where polymeric material is specified in this Standard as being required to comply with a specific test in CSA Standard C22.2 No. 0.6, the following gives the acceptance criteria to be applied for each test:

Test B (127 mm (5 in) 5 s Flame Application) The material shall (a) not support combustion for more than 60 s after the fifth application of the test flame; (b) not burn up to the holding clamp;

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(C) not drip flaming particles that ignite the surgical cotton; and (d) on completion of the flame test, comply with the probe test requirements of Clause 4.4.7.

Test D (19 mm (3/4 in) Yellow Tip Flame) (a) The material shall not support combustion for more than 60 s after the removal of either application of the test flame. (b) No other criteria are specified.

Test E (Horizontal Burning) This test is complete in itself.

Test H (Foamed Plastic) This test is complete in itself.

4.1.6 Solder and fluxes used in copper and brass connections of potable liquid dispensing systems shall contain no more than 0.2% lead by mass.

4.2 Mechanical Strength

4.2.1 Enclosures Enclosures for electrical parts and wiring shall be formed and assembled so that they will have the strength and rigidity necessary to resist the abuse to which they may be subjected, without increasing the fire and accident hazards due to partial collapse with resulting reduction of spacings, loosening or displacement of parts, or other defects.

4.2.2 Enclosures shall comply with the physical abuse test specified in Clause 6.16.

4.2.3 Cabinet The cabinet shall comply with the cabinet strength tests specified in Clause 6.15.

4.2.4 Glass Assemblies

4.2.4.1 Except as permitted in Clause 4.2.4.2, glass door assemblies and other glass panel assemblies that enclose live parts shall comply with the physical abuse test in Clause 6.17.

4.2.4.2 A glass door assembly is not required to comply with the requirements of Clause 6.17 if the assembly includes a means to deenergize the enclosed live parts in response to the breakage of glass.

4.3 Protection from Fire Hazard

4.3.1 Polymeric material forming enclosures of live parts, including

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polymeric outer cabinet panels, shall comply with Test B of CSA Standard C22.2 No. 0.6. Where an adhesive foil is used in conjunction with polymeric

materials to form an enclosure or part of an enclosure of live parts, the combination shall comply with Clause 4.2.1 and Test B of CSA Standard C22.2 No. 0.6. The foil shall remain intact and the combination shall retain its mechanical integrity.

4.3.2 Electrical Components

4.3.2.1 Electrical components shall be secured directly to a metal plate or to a nonmetallic material that complies with Test B of CSA Standard C22.2 No. 0.6, except as permitted by Clause 4.3.3.

4.3.2.2 Electrical components designed to be snap—fitted in place, such as door switches, pilot lights, etc, may be mounted on material that complies with Test E of CSA Standard C22.2 No. 0.6, provided such components have integral leads or insulated terminals and the

component enclosure complies with the enclosure requirements of the

component Standard.

4.3.2.3 Electrical components shall be individually enclosed if (a) their design and location with respect to openings in the enclosure may result in emission of flame or molten metal through openings in the cabinet or otherwise result in a fire hazard; (b) there are openings in the bottom of the compartment in which the part is located that would permit dropping of molten metal, etc, on the surface underneath the equipment. An individual enclosure is not required if a baffle plate complying with Clause 4.3.1 is located below the component to prevent dropping of molten metal on the floor. The plate shall extend beyond the projection of the component including all terminals (see Figure 1); (C) there are openings in the top surface of the outer cabinet that would permit objects to fall on or near uninsulated live parts; or (d) the part is in proximity to combustible material (unless separated as specified in Clause 4.3.3).

4.3.3 Separation from Combustible Material Ignition sources within the unit (that is, wiring, other than wires with FT1 classification as specified in CSA Standard C22.2 No. 0.3, heater wire, and any electrical components such as a switch, relay, transformer, motor winding, or the like, not enclosed in material that complies with Test B of CSA Standard C22.2 No. 0.6), including live parts that are not required by Clause 4.3.2.3 to be individually enclosed, shall be separated from any material that does not comply with Test B of CSA Standard C22.2 No. 0.6.

Acceptable means of separation are as follows: (a) Metal foil not less than 0.13 mm (0.005 in) thick; (b) Fibreglass not less than 12.7 mm (0.5 in) thick; (c) Polymeric material that complies with Test B of CSA Standard C22.2 No. 0.6; or (d) Wiring insulation not less than 1.6 mm (0.064 in) thick (see

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Clause 4.23.2), except that a lesser thickness is acceptable if the wiring is restricted and maintained by design such that it is spaced not less than 6.4 mm (0.25 in) from combustible material.

4.3.4 For equipment having a metal outer cabinet, the following means of separation are acceptable instead of those of Clause 4.3.3: (a) Spacing not less than 6.4 mm (0.25 in) from combustible material, provided that underneath the ignition source there is a barrier of material that complies with Test B of CSA Standard C22.2 No. 0.6; (b) Insulated internal wiring and insulated low wattage resistance type heater wire rated at not more than 8.5 W/m (2.5 W/ft) that is in contact with material that complies with Test E or Test H of CSA Standard C22.2 No. 0.6, as applicable; or

(C) Insulated internal wiring that is restricted and maintained by design such that it is spaced not less than 6.4 mm (0.25 in) from combustible material.

4.4 Protection from Shock Hazard

4.4.1 All live parts except supply wires, cables, or appliance wiring complying with Clause 4.23.2 shall be enclosed in asuitable cabinet or equivalent enclosure that complies with the requirements of Clauses 4.4.2 to 4.4.7.

4.4.2 Electrical components shall be located, guarded, or enclosed so that a shock hazard is not created when uninsulated live parts in low voltage and extra—low voltage safety control circuits are wetted by liquids during normal operation of the equipment, including (a) defrosting, as determined by the defrost test, Clause 6.7; (b) condensing or dripping of condensation, as determined by the temperature (normal) test, Clause 6.4; and (C) normal cleaning, sanitation, charging, or filling procedures common to the equipment.

4.4.3 Thermal insulation, such as mineral wool that may contain conductive impurities, shall not contact uninsulated live parts.

4.4.4 To ensure that a shock hazard is not created, equipment shall be constructed so that (a) condensate disposal means, such as a pan, trough, or the like, are designed and located such that overflow will not wet uninsulated live parts; (b) a blocked drain, a water inlet valve blocked in the open position, or leakage from a water line connection will not wet uninsulated live parts. A waste outlet having a clear opening of not less than 19.1 rum

(3/4 in) diameter and located at the lowest level to which water may drain is not considered subject to blockage; and (c) lines for dispensing liquids, ice, and the like are located

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such that leakage at a connection will not wet uninsulated live parts.

4.4.5 An overflow test (see Clause 6.23) shall be conducted if it is not evident that the equipment complies with the requirements of Clause 4.4.4.

4.4.6 Uninsulated live parts located inside the enclosure that are likely to be contacted by persons performing operations such as adjusting controls or oiling motors, shall be located, guarded, or enclosed to reduce the risk of unintentional contact unless tools are required to expose the uninsulated live part, or a nondefeatable interlock mechanism is provided. Note: A "nondeteatable interlock" is considered to be one which cannot be operated by the probe illustrated in Figure 2.

4.4.7 Openings in Enclosures An opening is acceptable if the probe illustrated in Figure 2 cannot contact live parts. The probe shall be applied (1) with a force of 22 N (5 lbf) and (2) in any possible configuration and to any depth that the size of an opening will permit. The probe shall be rotated or angled to any possible position before, during, or after insertion through the opening; if necessary, the configuration shall be changed after the probe has been inserted through the opening.

4.5 Doors and Covers of Enclosures

4.5.1 Doors and covers shall have means for securing them firmly in place. If uninsulated live parts are exposed by removal or opening of doors and covers, the securing means shall require the use of a tool for removal.

4.5.2 Whenever the parts specified in Clause 4.5.1 are required to be opened to replace fuses or reset overload devices or the like, they shall be attached also by hinged, sliding, or similar means, to prevent them from being removed from the equipment.

4.6 Protection from Mechanical Hazards

4.6.1 When equipment is installed in its intended manner, openings shall be designed, located, or guarded to reduce the risk of injury to persons due to unintentional contact with moving parts such as fan blade blower wheels, gears, and belts, or due to unintentional contact with any hot parts exceeding 90°C (other than the refrigerating system). Compliance with this requirement shall be determined by the tests in Clauses 4.6.3 and 4.6.4 with guards and covers, requiring a tool for removal, in place.

4.6.2 A guard or cover that does not require a tool for removal and

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allows access to moving parts shall •be provided with a nondefeatable interlock mechanism.

4.6.3 Openings having a minor dimension of less than 25.4 mm (1 in) are acceptable if the probe illustrated in Figure 2 cannot contact moving parts. The probe shall be applied (a) with a force of 11 N (2.5 lbf); and (b) in any possible configuration and to any depth that the size of an opening will permit. The probe shall be rotated or angled to any possible position before, during, or after insertion through the opening; if necessary, the configuration shall be changed after the probe has been inserted through the opening.

4.6.4 Openings having a minor dimension of 25.4 mm (1 in) or more are acceptable if the distance from the opening to a moving part is in accordance with Table 1.

4.6.5 All commercial refrigerated equipment having storage compartments with a minor dimension qreater than 205 mm (8 in) and a volume greater than 60 L (2 ft) shall be equipped with a means that will permit at least one outer door to be opened from the inside or shall be provided with nonautomatic external locks and keys and shall comply with the door latch release test of Clause 6.22. Door frame assemblies for use with refrigerated equipment shall also meet this requirement.

4.6.6 Lids that have a mass of 15.8 kg (35 lb) or greater which upon closing could cause personal injury, shall be counter—weighted or equivalent, or shall be provided with automatic latches or equivalent to retain them in the open position.

4.7 Mechanical Assembly

4.7.1 Parts used in the construction of equipment shall have adequate strength and shall be assembled and secured in position to ensure proper functioning under both normal and abnormal conditions that may be met in service.

4.7.2 Equipment shall be so assembled that the vibration of normal operation will not result in a hazardous condition.

4.7.3 A switch, lampholder receptacle, motor attachment—plug, or similar component shall be secured in position and shall be prevented from turning. Notes: (1) A lampholder of a type in which the lamp cannot be replaced, such as a neon pilot or indicator light in which the lamp is sealed in a nonremovable jewel, need not be prevented from turning if rotation cannot reduce electrical spacings below the minimum

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acceptable values. (2) A lockwasher is not considered a suitable means for the prevention of rotation of a stem—mounted rotary switch or control.

4.7.4 The condensing unit of self—contained equipment shall be adequately protected to prevent accidental damage to wiring, electrical components, and refrigerant tubing.

4.7.5 Equipment having a condensing unit of the pull—out type shall be so constructed that the condensing unit can be pulled out without kinking or otherwise damaging the refrigerant tubing, and without pinching, abrading, or stressing wires and cords.

4.7.6 Equipment shall be assembled so that removal and replacement of tanks and containers, replenishment of product, and the like, will not result in damage to wiring, electrical components, or the refrigerating system.

4.7.7 Equipment having provision for the storage of carbon dioxide cylinders shall be provided with means to retain the cylinders in position.

4.7.8 Equipment for Outdoor Use (Corrosion Protection) Sheet steel cabinets and enclosures of units intended for outdoor use shall be protected against corrosion as specified in Table 4, or by other metallic or nonmetallic coatings that have been shown to give equivalent protection. Nonferrous cabinets and enclosures may be employed without

special corrosion protection. The thickness of the material is to be judged on the basis of its strength and rigidity.

4.7.8.1 Where Table 4 references this Clause, a cabinet or enclosure exposed to weather shall be provided with one of the following coatings: (a) Hot dipped mill galvanized sheet steel conforming with the coating designation G60 or A60 in Table 1 of ASTM Standard A525, with not less than 40% of the zinc on any side, as determined by the minimum single spot test requirement in this ASTM Standard. The weight of zinc coating may be determined by any recognized method; however, where results are in question, the weight of coating shall be established in accordance with the test method of ASTM Standard A90; (b) A zinc coating, other than that provided on hot dipped mill galvanized sheet steel, uniformly applied on each surface to an average thickness of not less than 0.01041 mm (0.00041 in), and to minimum thickness of 0.00864 mm (0.00034 in); or Cc) Two coats of outdoor paint on both surfaces. The suitability of the paint shall be determined by consideration of its composition.



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4.7.8.2 Where Table 4 references this Clause, a cabinet or enclosure intended for outdoor use shall be provided with one of the following coatings: (a) Hot dipped mill galvanized sheet steel having the coating designation G90 in Table 1 of ASTM Standard A525, with not less than 40% of the zinc on any side, as determined by the minimum single spot test requirement in this ASTM Standard. The weight of zinc coating may be determined by any recognized method; however, where results are in question, the weight of coating shall be established in accordance with the test method of ASTM Standard A90; (b) A zinc coating, other than that provided on hot dipped mill galvanized sheet steel, uniformly applied on each surface to an

average thickness of not less than 0.01549 ruin (0.000610 in), and to a minimum thickness of 0.01372 ruin (0.00054 in); or (C) A zinc coating complying with Item (a) or (b) of Clause 4.7.8.1, plus one coat of outdoor paint as specified in Item (c) of Clause 4.7.8.1 on each surface.

4.7.8.3 Other finishes, including paints, special metallic finishes, and/or a combination of the two, may be accepted provided that the resultant finish provides equivalent protection to that of

galvanized steel as specified in Clauses 4.7.8.1 or 4.7.8.2 as

applicable.

4.7.8.4 Metals shall not be used in combinations such as to cause galvanic action that will adversely affect cabinets or enclosures.

4.7.9 Construction of Enclosures, Outdoor Use Equipment

4.7.9.1 The outer cabinet of the equipment intended for outdoor use shall be so constructed as to prevent the wetting of uninsulated live parts and shall protect the system against shock hazard due to

exposure to rain, and shall comply with the rain test in Clause 6.18.

4.7.9.2 Service covers and access panels that are not secured by screws or other fasteners that require the use of tools to remove them, shall be left open or removed during the rain test, Clause 6.18.

4.7.9.3 An enclosure for electrical components shall have provision for

drainage if the enclosure employs knockouts or unthreaded openings. The drainage holes shall be not less than 3.2 ruin (1/8 in) diameter or drainage openings of at least equivalent size shall be included.

4.7.9.4 Nonmetallic materials used for the cabinet and gaskets for electrical parts and wiring in equipment for outdoor use shall not be adversely affected by atmospheric temperature changes and shall resist the effects of exposure to sunlight or rain if they are



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located so as to be exposed to these conditions.

4.7.9.5 Where gaskets are employed in order for enclosures of electrical components to comply with the rain test of Clause 6.18, the gasket material shall comply with Clause 6.19.

4.7.10 Field Wiring, Outdoor Use Equipment Conduit openings or knockouts shall be provided for all field wiring connections, and shall be at least 22.2 mm (7/8 in) diameter. Threaded openings shall be provided unless the location of the openings (a) is wholly below the lowest uninsulated live part within the enclosure; or (b) prevents drainage into the enclosure along the outside surface of a field—supplied wireway; or (c) is such that the routing of the factory— or field—supplied wiring forms a drip—loop which physically prevents any entering moisture from reaching uninsulated live parts.

4.8 Safety of Refrigerating System

4.8.1 Refrigerants shall be one of the types listed in CSA Standard B52.

4.8.2 Refrigerant—containing components shall comply with the requirements of CSA Standard C22.2 No. 140.3, and shall have design pressure rating suitable for the application.

4.8.3 Except for components and pressure vessels required to comply with CSA Standard B52, refrigerant—containing components shall meet the requirements of Clause 4.8.1.2 and shall withstand, without failure, a pressure equal to not less than five times the maximum normal working pressure or three times the maximum abnormal working pressure, whichever is greater, as determined by Clause 4.9.

4.8.4 Pressure vessels that are required to comply with CSA Standard 352 shall have a working pressure of at least the design pressure of the equipment as specified in Clause 4.9.3.

4.9 Determination of Maximum Working Pressures

4.9.1 Normal For the purpose of Clause 4.8.1.2, the maximum normal working pressures shall be as follows: (a) For high side parts, the highest of the following:

(i) The condensing pressure when the equipment is operated under the most severe condensing conditions for which it is

intended, but in any case for equipment with an air—cooled condenser, at a condenser air inlet temperature of not less than 40°C (104°F), and for equipment with a water—cooled condenser, at condenser water temperatures not less than 26.7°C (80°F) at the inlet and 37.8°C (100°F) at the outlet; and under the most severe

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evaporator conditions for which it is intended (see Clause 6.2); Note: In determining the most severe load conditions the testing authority relies on published statements by the manufacturer, including marking of equipment to show conformity with trade association performance standards.

(ii) Minimum design pressure specified in CSA Standard 352, Table 5.3 (see Appendix 3);

(iii) The condensing pressure of water—cooled equipment that does not have a pressure limiting device, if the water flow is stopped;

(iv) The design pressure marked on the equipment, if it exceeds that required by Clause 4.9.3. (b) For low side parts, the highest of the following:

(1) The evaporator pressure when the equipment is operated as specified in (a)(i) above;

(ii) The vapour pressure of the refrigerant at 21.1°C (70°F); (iii) The evaporation pressure when exposed to some design

temperature above 21.1°C (70°F); (iv) The minimum design pressure specified in CSA Standard

352, Table 5.3 (see Appendix 3); Cv) The design pressure marked on the equipment, if it

exceeds that required by Clause 4.9.3; (vi) The evaporator pressure that results when a bulk milk

cooler of the direct expansion type is washed with water at 90°C (194°F). Note: For convenience, this pressure can be assumed to be the saturated vapour pressure of the refrigerant at 90°C (194°F).

4.9.2 Abnormal Maximum abnormal working pressure shall be as follows: (a) For high side parts. The pressure developed in temperature (abnormal) operation tests (see Clause 6.11). (b) For low side parts. The highest of the following:

(i) The low side pressure developed in the condenser fan failure (see Clause 6.11.1) or the condenser water failure (see Clause 6.11.2) including the pressure that results when the compressor stops;

(ii) The setting or rating of a pressure relief or rupture member fitted in the low side;

(iii) If the high side operating pressure is limited by a pressure relief valve that is vented into the low—pressure side of the system, the value of low side pressure that results from the action of the pressure relief valve;

(iv) The maximum low side pressure that results when the action of the compressor of a bulk milk cooler of the direct expansion type is stopped at any point during the normal operating cycle, including a period during which it is being filled, as noted in Clause 6.2.6.2 and a period during which it is being washed with water at 90°C (194°F).

4.9.3 The high and low side design pressures to be marked on equipment (see Clause 5.3(f)) shall be not less than the highest of the following: (a) The maximum normal working pressure as determined in Clause 4.9.1; or

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(b) Three—fifths of the maximum abnormal working pressure, as determined in Clause 4.9.2.

4.10 Protection Against Excessive Pressure

4.10.1 Equipment shall have protective means such as a fusible plug, rupture member, or pressure relief valve, or shall be so constructed that some part of the system will safely relieve the pressure in case of fire. Acceptable pressure relief means include soldered joints in tubing, gasketed joints, and elastomeric insulators for terminals of hermetic compressors. Note: "Soldered joints" include joints made with various filler metals suitable for the base metals being joined and having nominal melting points between 204°C and 426°C.

4.10.2 If the refrigerating system includes a liquid—containing pressure— containing component with an inside diameter of over 76 mm (3 in), but not over 152 mm (6 in), that can be isolated by valves from the other parts of the equipment, the pressure—containing component shall be protected by (a) a rupture member or pressure relief valve that will relieve the pressure at not more than 40% of the pressure defined in Clause 4.8.1.2 or 40% of the pressure it is capable of withstanding, as determined by the pressure test in Clause 6.1 of CSA Standard C22.2 No. 140.3; or (b) a fusible plug that does not exceed the relieving pressure specified in Item (a) above, provided that the critical pressure of the refrigerant used does not exceed the relieving pressure specified in Item (a) above or the saturation pressure of the refrigerant used at the temperature marked on the plug.

4.10.3 No stop valve shall be located between any pressure relief device or fusible plug and the part or parts of the system protected thereby.

4.10.4 All pressure relief means shall be connected adjacent to or directly to the pressure—containing component or parts of the system protected. Except as indicated in Clause 4.10.5, pressure relief devices shall be connected above the liquid refrigerant level, and installed to make them accessible for inspection and repair, and to protect them from conditions that could cause them to malfunction.

4.10.5 Fusible plugs may be located either above or below the liquid refrigerant level.

4.10.6 The size of the pressure relief device, if required, shall be determined in accordance with CSA Standard B52.



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4.10.7 Pressure relief devices may discharge into the low—pressure side of the system, provided that they are not appreciably affected by back pressures, and provided that the low—pressure side of the system is equipped with its own pressure relief device. The low side pressure relief devices shall have capacity to protect either the pressure—containing components that are relieved into the low— pressure side of the system, or all pressure—containing components on the low side of the system, whichever relieving capacity is the greatest.

4.10.8 Except as specified in Clause 4.10.9, a pressure relief valve shall be sealed at a start—to—discharge pressure not exceeding the marked working pressure of the pressure—containing component it protects.

4.10.9 A pressure relief valve for a pressure vessel that does not have a marked working pressure shall be sealed at a start—to—discharge pressure that corresponds to no more than one—fifth of the ultimate strength of the pressure—containing component.

4.10.10 Where the pressure relief means is provided by a rupture member, the nominal rated rupture pressure of the member shall not exceed the marked design pressure of the vessel protected, or one—fifth of the ultimate strength of pressure—containing components that do not have a marked design pressure.

4.10.11 Rupture members shall burst at the pressure specified in CSA Standard C22.2 No. 140.3, Clause 6.3.

4.10.12 Fusible plugs shall operate at a temperature within 5.6°C (10°F) of the marked temperature rating when tested in accordance with Clause 6.2 of CSA Standard C22.2 No. 140.3.

4. 10. 13 A positive displacement compressor operating at pressures exceeding 103 kP4 (15 psig) and having a displacement exceeding 0.02 m-/s (50 ft/min) shall be equipped with a pressure relief device having the capacity and the pressure setting necessary to prevent rupture of the compressor. The pressure relief device shall be located between the compressor and the stop valve on the discharge side. Discharge from the device may be vented to the atmosphere or into the low—pressure side of the system.

411 Pressure Limiting Devices

4.11.1 A pressure limiting device shall be provided on all air—cooled and remote type equipment (a) having a liquid receiver capable of containing 9 kg (19.8 ib) or more of refrigerant without the liquid occupying more than 90% of the volume of the receiver at a temperature of 32°C (89.6°F); or

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(b) containing more than 10 kg (22 ib) of refrigerant.

4.11.2 A pressure limiting device shall be provided on all equipment having a water—cooled condenser unless (a) the capacity of the liquid receiver at 32°C (89.6°F) does not exceed 1.4 kg (3.1 lb) if 90% of the available volume is filled with liquid; and (b) a compressor motor overload device will stop the action of the compressor before the pressure exceeds one—fifth of the high side pressure that the system is capable of withstanding without failure.

4.11.3

Except as specified in Clause 4.11.4, if the equipment has a pressure limiting device, the maximum pressure to which it may be set by the adjusting means shall not exceed 90% of the following, whichever is the smallest: (a) One—fifth of the pressure that the high side parts of the system are capable of withstanding without failure (see Clause 4.8.1.2); (b) The lowest marked design pressure of pressure—containing components used in the high side; (c) The setting of the pressure relief device, if any, in the high side of the system; or Cd) The high side design pressure marked on the equipment. Note: The pressure limiting device may have a maximum pressure setting higher than specified above if the adjusting means on the device is locked in some manner to prevent the maximum adjustable pressure from being exceeded.

4.11.4 For a pressure limiting device installed on air—cooled equipment not required by Clause 4.11.1 to be provided with such a device, the device shall have a maximum adjustable cutout setting not exceeding (a) one—third of the pressure that the high side parts of the system are capable of withstanding without failure (see Clause 4.8.1.2); or (b) 90% of the setting of the pressure relief device, if provided.

4.11.5 The pressure limiting device shall stop the action of the compressor at a pressure rio higher than the maximum setting specified in Clause 4.11.3.

4.11.6 There shall be no shut—off valves between the pressure limiting device and the pressure imposing element.

4.12 Water Heating Tanks

4.12.1 Water heating tanks shall comply with CSA Standard C22.2 No. 110.

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4.12.2 Water heating tanks that are not vented to the atmosphere shall have sufficient strength to withstand the hydrostatic test, Clause 6.25.

4.12.3 Water heating tanks that are not vented to the atmosphere shall have a readily accessible fitting to which may be connected a pressure relief valve as required by plumbing codes in the locations where the equipment is installed.

4.13 Pressurized Product Systems

4.13.1 Pressurized product systems shall include a pressure regulating device.

4.13.2 Pressurized product systems shall include a means to relieve excess pressure.

4.13.3

Except as specified in Clause 4.13.4, a pressurized product system shall have sufficient strength to withstand the pressure test specified in Clause 6.26.1.

4.13.4 If the pressurized product system includes a pressure vessel, the vessel shall comply with the applicable requirements of CSA Standard B51. The working pressure of the vessel shall be not less than the setting of the pressure regulating device as specified in Clause 4.13.1.

4.14 Freezing Chambers Under Pressure

4.14.1 Freezing chambers that are not vented to the atmosphere and that are intended to be maintained under fluid pressure shall be

protected by pressure relief means that will relieve the pressure when it exceeds the maximum normal value permitted by the design of the equipment.

4.14.2 Freezing chambers as specified in Clause 4.14.1 shall have sufficient strength to withstand the test in Clause 6.26.1.

4.15 Supply Connections

4.15.1 General Equipment may be cord—connected unless (a) the voltage rating exceeds 250 V; (b) it will not start and operate as intended without rupturing a 60 A fuse; (C) the marked rating exceeds 48 A; or (d) it is part of a system other than a self—contained system.

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4.15.2 Cord—Connected Equipment

4. 15. 2. 1 Cord—connected equipment shall have a Supply cord that has a flexible cord rated at least as a hard usage type and ranges in length between 0.5 and 3 m (1.5 and 10 ft) depending on application and (a) for outdoor equipment, complies with the requiremen for Type sow or SJTW; (b) for indoor equipment, complies with the requiremen5 for any of Types SJ, SJT, SJO, or SPT—3; and (C) includes a Conductor for grounding purposes. 4. 15. 2. 2 Supply cords shall have current—carrying capacities at least equal to the total input in amperes measured when operating under normal load conditions as specified in Clause 6.2 or defrost Conditions as specified in Clause 6.7, whichever produces the highest input. The total marked input shall include the maximum allowable

external load that may be Connected to any convenience receptacle present on the equipment (see Clause 5.4.1).

4.15.2.3 The supply cord attachment_plug shall be a general purpose type and shall have a voltage rating Suitable for the nominal voltage marked on the equipment and a current rating not less than 125% of the total input marked on the equipment.

4.15.2.4 General purpose attachment_plugs shall comply with the requiremen of CSA Standard C22.2 No. 42. Special—use attachment_plugs shall comply with the requireme of CSA Standard C22.2 No. 182.3.

4.15.2.5 All cord—connected equipment shall be provided with a switch complying with Clause 4.29 to disconnect all ungrounded supply conductors. The main disconnect switch is not required on equipment rated 125 V or less, with any one motor rated 1/3 hp or less.

4.15.2.6 Accessory components on equipment shall comply with Clause 4.15.2.1 and may be terminated in a special-use attachment_plug with a voltage and current rating suitable for the component load specified.

4.16 Permanently Connected Equipment

4.16.1 Equipment intended for permanent connection shall be provided with a terminal or connection box, or similar compartment having provision for conduit connection to the source of supply and a grounding means as required by Clause 4.37. Such boxes shall comply with the requiremen5 of CSA Standard C22.2 No. 0. Conduit openings shall accommodate the trade size of Conduit as determined

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in the Canadian Electrical Code, Part I, Section 12.

4.16.2 Equipment intended to be connected in the field with other auxiliary devices shall include provision for permanent connection of the auxiliary devices as specified in Clause 4.16.1.

4.16.3 The metal plate to which conduit or armoured cable is attached, if of sheet steel, shall be not less than 0.78 mm (0.031 in) thick and not less than 1.08 mm (0.43 in) thick if of nonferrous metal.

4.16.4 Terminal boxes or wiring compartments in which supply connections are made shall be secured to prevent rotation and shall be located so that connections will be readily accessible for inspection after the equipment is installed as intended.

4.17 Field Wiring Terminals

4.17.1 Field wiring terminals shall have means other than friction to prevent them from turning, which could result in reduced electrical spacings (see Clause 4.35).

4.17.2 Field wiring terminals shall be a size which will accommodate conductors of an ampacity as required by the Canadian Electrical Code, Part I, when operating under normal load conditions as specified in Clause 6.2 or defrost conditions as specified in Clause 6.7, whichever provides the highest input.

4.17.3 Where leads are provided for field connection, they shall be not smaller than No. 18 AWG or less than 152 mm (6 in) long. These leads shall be provided with means for strain relief if stress on the leads may be transmitted to terminals, splices, or internal wiring that may cause the leads to separate from their terminations, or subject them to damage by sharp edges.

4.17.4 If a binding head screw is employed at a field wiring terminal, it shall be not smaller than No. 8 if the supply circuit conductors are No. 14 AWG, and not smaller than No. 10 if the supply circuit conductors are No. 12 or No. 10 AWG. Screws made of steel shall be suitably plated. Note: The terminals of a control may be employed for the connection of supply circuit conductors, provided the terminals comply with the size requirements above.

4.17.5 If supply conductors are larger than No. 10 AWG, the terminal screws shall be suitable for the lugs or connectors provided on the conductors.

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4.17.6 The arrangement and spacing of terminal parts within enclosures, wherein field—installed conductors are to be connected, shall ensure that the largest conductors to be accommodated can be installed, without forcing the insulation of the conductors against uninsulated live parts of opposite polarity or other different potential, so as to comply with the requirements for separation of circuits (see Clause 4.36).

4.18 Current—Carrying Parts

4.18.1 All current—carrying parts shall be of silver, copper, copper alloy, or other materials that are inherently resistant to corrosion.

4.18.2 Uninsulated live parts, including terminals, shall be secured so that neither they nor their supporting means can be moved to reduce the spacings required by Clause 4.35.1.

4.19 Strain Relief (Supply Cord)

4.19.1 Strain relief shall be provided so that mechanical strain on the supply cord will not be transmitted to terminals, splices, or interior wiring. The strain relief means shall comply with the test specified in Clause 6.24.

4.19.2 If a metallic means of strain relief is provided, it shall not touch uninsulated live parts or reduce spacings within the enclosure if the cord is moved inward.

4.20 Bushings

4.20.1 Where a flexible cord or insulated conductor passes through an opening in a wall, barrier, or enclosure, there shall be a bushing or equivalent installed in the opening to prevent abrasion to the conductor insulation. The bushing shall be substantial and shall be reliably secured in place, or the edges of the hole shall have a smoothly rounded surface against which the cord may bear.

4.21 Electrically Operated Valves and Solenoids

4.21.1 Electrically operated valves and solenoids shall comply with CSA Standard C22.2 No. 139.

4.21.2 An electrically operated valve or solenoid shall not create a fire hazard under abnormal conditions specified in Clause 6.11.6.

4.21.3 If a valve must be cleaned periodically, the construction shall be

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such that this operation can be performed without damage to the electrical parts of the valve or wiring.

4.22 Wiring

4.22.1 General

4.22.1.1 The space within the enclosures of equipment shall be sufficient for the distribution of wires and cables required for the proper wiring of the equipment, and for the separation of circuits required by Clause 4.36.

4.22.1.2 Wiring shall be supported and routed to prevent damage due to movement of shelves, food containers, or contact with sharp edges such as fins on refrigeration coils, moving parts, or parts that may attain a temperature in excess of that for which the wiring insulation is rated, and shall not be immersed in water unless rated for use in wet locations. Self—draining raceways that do not retain water are not considered as requiring wiring for use in wet locations.

4. 22 .1. 3 Splices shall be located, enclosed, and supported so that they are not subject to damage, flexing, motion, or vibration. A splice is considered enclosed in a junction box, control box, or other similar enclosed compartment. A splice shall be secured to a fixed member if it may be subject to movement or damage during servicing.

4.22.1.4 Insulated connectors in a semi-enclosed location such as the machine compartment shall be of a type accepted for general use or shall have a minimum insulation thickness as specified in Clause 4.23.2. The use of insulating tubing with a minimum wall thickness of 0.76 mm (0.030 in) is acceptable. Means such as the use of shrink tubing, or routing and securement

of the wiring harness, shall be provided to prevent disconnection at the connectors.

4.22.1.5 For a semi—enclosed location (a machine compartment accessible without the use of a tool is considered to be a semi—enclosed location), splices insulated within a moulded junction block or within heat—shrinkable tubing or equivalent shall have insulation on the current—carrying parts not less than the minimum conductor insulation. The aging characteristics of the compound shall be suitable for the temperature to which it is subjected. The assembly shall be well secured. Twist—on wire connectors and similar wiring devices are not acceptable.

4.22.1.6 Wireways shall be smooth and free from sharp edges and burrs that may cause abrasion of the insulation on the conductors.

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4.22.1.7 Rubber—insulated conductors, except those with oil—resistant compounds, shall not be used where they may be exposed to oil, grease, oily vapour, or other substances having a deleterious effect on rubber.

4. 22.1. 8 Stranded conductors at terminals shall be prevented from contacting other uninsulated live parts that may not always be of the same polarity as the wire, and from contacting dead metal parts. The shanks of terminal connectors shall be protected by insulating tubing, or equivalent, if spacings may be reduced by loosening the

clamping means.

4.23 Types of Wiring

4.23.1 The wiring shall consist of types that are suitable for the particular application when considered with respect to (a) temperature and voltage to which wiring is liable to be subjected; (b) exposure to oil, grease, or other substances liable to have a deleterious effect on the insulation; Cc) exposure to moisture; Cd) other conditions of service to which the wire is liable to be subjected; and (e) combustible materials (see Clauses 4.3.3 and 4.3.4).

4.23.2 Equipment shall be wired by one or more of the following means: (a) Type SJ, SJO, SJT, or SPT—3 flexible cords or appliance wiring material suitable for refrigeration use. Appliance wiring material shall have a nominal insulation

thickness of not less than 1.52 trim (0.060 in) for No. 16 or No. 18 AWG conductors and not less than 1.98 mm (0.078 in) for No. 10 to 14 AWG conductors, and not less than 2.38 mm (0.094 in) for No. 8 conductors. The required total insulation thickness may be obtained by the

addition of insulating tubing over the conductors, provided that (i) the nominal insulation thickness of the appliance wiring

material is not less than 0.76 nun (0.030 in); (ii) extensions of appliance wiring material beyond the

insulating tubing do not exceed 25.4 mm (1 in), and wiring so exposed is covered with insulating tape, shrink tubing, or the equivalent; and

(iii) movement of the insulating tubing does not permit exposure of the appliance wiring material. (b) Suitable wiring material enclosed in conduit, suitable wireways, or equivalent enclosures. The nominal thickness of the insulation shall be

(1) not less than 0.76 trim (0.030 in), for rubber or thermoplastic—insulated fixture wire, or equivalent type wire;

(ii) not less than 0.76 mm (0.030 in), for thermoplastic— insulated appliance wiring; and

(iii) not less than 1.12 mm (0.044 in), for rubber insulated appliance wiring.



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(C) Arnioured or nonmetallic sheathed cable.

4.23.3 Parallel-conductor appliance wiring material of the integral type shall not be ripped more than 76 mm (3 in) unless the minimum thickness of insulation is at least 1.37 mm (0.054 in) after

ripping, or the material has conductor insulation not less than 0.66 mm (0.026 in) thick after ripping and is wholly contained within a separate enclosure.

4.23.4 Wiring of extra—low voltage Class 2 circuits (other than extra—low

voltage safety control circuits) that is separated from a flammable liner or insulation by acceptable means (see Clause 4.3.3) need not

comply with the requirements of Clause 4.23.2.

4.23.5 Wiring for Panels of Walk—In Coolers

4.23.5.1 Except as stated below, all wiring of panels for walk—in coolers shall be armoured or moisture—resistant nonmetallic sheathed cable or shall be one or more of the types specified in Clause 4.23.2.

4.23.5.2 All wiring shall be confined to one particular section unless provision is made for prewired panels to be properly connected

together at the time of installation.

4.23.6 Wiring to External Accessories The interconnecting wiring from accessories to the cabinet shall be, at least, a three—conductor Type SPT—3 flexible cord terminating in an attachment—plug having a grounding pin, and shall be routed and protected against mechanical damage. The interconnecting wiring shall comply with the strain relief

requirements of Clause 4.19.

4.23.7 Resistance Type Heater Wire The temperature of the insulation of resistance type heater wire used to prevent condensation on exposed surfaces shall not exceed its rated temperature limit. If the input to the heater exceeds 8.5 W/m (2.5 W/ft), or the wires are less than 19 mm (3/4 in) apart, or the wires are not in positive contact with a radiating surface, the heater shall be subjected to the temperature (condensation wiring) test specified in Clause 6.6.

4.23.8 Wiring to Doors and Lids

4. 23.8.1 The wiring between doors and lids to the cabinet shall consist of one or more of the types specified in Clause 4.23.2(a), and if exposed to the user, shall comply with the strain relief requirements of Clause 4.19.

4. 23.8.2

Wiring to doors and lids that is subjected to bending or twisting during normal use of the equipment shall comply with the flexing

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test specified in Clause 6.14.

4.23.9 Conductor Size

4. 23 .9.1 Except as specified in Clauses 4.23.9.2 and 4.23.9.3(a), conductors shall have an ampacity (a) for cord—connected equipment, not less than one—third of the ampacity of the power supply cord; or (b) for permanently connected equipment, not less than one—third of the ampacities of the supply conductors.

4. 23.9. 2 Conductors shall not be required to comply with Clause 4.23.10.1 if (a) they are No. 18 AWG or larger and not more than 1.2 m (4 ft) in length and provided with overcurrent protection in the equipment at the point where the smaller conductor receives its supply; (b) they are connected between two fixed impedances that reduce the risk of a high fault current within the conductor (eg, a conductor extending between a motor-running capacitor and the start—winding of a permanent split capacitor motor); (C) the conductor is a jumper lead between controls and is not longer than 76 mm (3 in), unless the conductor is located in a control panel; or (d) the conductors comply with the short—circuit test for wiring, Clause 6.28.

4.23.9.3 The minimum size of conductor shall be No. 18 AWG, except that No. 22 AWG conductors shall be acceptable as integral leads of lampholders, solenoids, or other loads rated at not over 60 V'A.

4.23.9.4 For extra—low voltage Class 2 circuits, the conductor size shall be adequate for the normal or short—circuit current likely to occur.

4.23.10 Control Circuits

4.23.10.1 A low voltage control circuit shall be considered a safety circuit if it includes contacts of any controls integral with, or external to, the equipment that are intended to prevent unsafe operation of the equipment (due to circuit wiring becoming grounded, open— circuited, or short—circuited), such as (a) a device to prevent overheating of a motor due to overload (including locked rotor); (b) a temperature limit switch, the failure of which to operate might result in an unsafe operation; or (C) a pressure limiting device in a refrigerating system, the failure of which to operate might result in an unsafe condition. Note: A control circuit having a pressure limiting device is not considered to be a safety circuit if the pressure limiting device is not required by Clause 4.11 and all parts of equipment subjected to refrigerant pressures comply with Clause 4.8.



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4. 23. 10. 2 In a control circuit that is a safety circuit, the contacts of a safety device shall be connected to the ungrounded side of the control circuit.

4.23.10.3 Conductors of low voltage control circuits shall be provided with overcurrent protection. The rating of the overcurrent protective device or devices shall not exceed the applicable values specified in Table 6, except (a) conductors of size Nos. 18, 16, and 14 AWG that do not exceed 1.2 in (4 ft) in length, may be protected by overcurrent protective devices rated 60 A or less; (b) an overcurrent protective device of a higher rating may be used if the conductors withstand short—circuiting when tested as specified in the limited short—circuit test, Clause 6.27; (c) a lead of 305 mm (12 in) or less in length need not be provided with overcurrent protection; (d) a control circuit conductor, supplied from the secondary of a single—phase transformer that is connected so that only a two—wire (single voltage) secondary is used, may be protected by an overcurrent device located on the primary side of the transformer, provided that this protection complies with requirements for transformers in Clause 4.26 and the rating of the device does not exceed the applicable values specified in Table 6, multiplied by the ratio of secondary to primary rated transformer voltage; and Ce) a control circuit conductor that is tapped from the main power circuit at a point outside of the control equipment enclosure shall be protected as specified in the relevant requirements of the Canadian Electrical Code, Part I.

4.23.10.4 Except as specified in Clause 4.23.10.5, overcurrent protection for a conductor of a low voltage control circuit, as required by Clause 4.23.10.3, shall be provided as part of the equipment if, based on the marked rating of the equipment, the rating of the branch circuit overcurrent protective device exceeds the applicable values specified in Table 6.

4.23.10.5 If the unit employs a direct—connected low voltage circuit, and the overcurrent protective devices are not provided as part of the unit, the unit shall be marked to specify the type and maximum size of overcurrent device for the unit.

4.23.10.6 Except as specified in Clause 4.23.10.7, control circuit overcurrent protective devices shall be provided for all ungrounded conductors, be sized in accordance with the requirements of Clause 4.23.10.3, and shall have a voltage rating not less than the circuits in which they are used. The devices shall be either a circuit breaker or a fuse suitable for branch circuit protection.

4. 23. 10.7 If the control circuit is tapped from a circuit supplying other loads in the equipment, a device used for overcurrent protection

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may be of the supplementary type, provided that it has a short circuit rating acceptable for the circuit in which it is used. See Clause 5.11 for fuse replacement marking.

4.23.10.8 Where the equipment has part of a control circuit included within it, and is intended to have the circuit completed at the time of installation by external wiring to a safety device located outside the equipment, the equipment shall be marked to show that the external wiring is to comply with the requirements for a Class 1 circuit, as provided in the Canadian Electrical Code, Part I.

4.24 Electrical Insulation

4.24.1 Uninsulated live parts shall be supported on insulating materials such as porcelain, phenolic composition, or some equivalent material that complies with the moisture absorption resistance test of Clause 6.20 and flame test D of CSA Standard C22.2 No. 0.6.

4.24.2 Vulcanized fibre may be used for insulating bushings, washers, separators, and barriers but shall not be used as the sole support for uninsulated live parts.

4.25 Motors

4.25.1 Motors, other than those described in Clause 4.25.2.2, shall comply with CSA Standard C22.2 No. 100.

4.25.2 Motor Overheating and Overload Protection

4.25.2.1 Motors, other than those described in Clause 4.25.2.2, with inherent overheating protection shall comply with the applicable clause of CSA Standard C22.2. No. 100.

4. 25. 2. 2

Hermetically sealed motors and compressors shall comply with the requirements of CSA Standard C22.2 No. 140.2.

4.25.2.3 All motors shall be protected against overload and overheating by thermal or overcurrent protective devices. For any motor protection methods not covered in Clauses 4.25.2.4 to 4.25.2.7, the protection method shall be as specified in Section 28 of the Canadian Electrical Code, Part I.

4. 25.2.4 For a motor other than a hermetic refrigerant motor compressor, an overload device responsive to motor current shall be rated or selected to trip at not more than the following: (a) 125% of the full load current rating of a motor having a marked service factor of 1.15 or greater; or (b) 115% of the full load current rating of a motor that does not

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have a marked service factor or where the marked service factor is less than 1.15.

4. 25. 2. 5 Overload devices shall consist of one of the following: (a) A separate overload device that is responsive to motor current, rated or set at values not greater than the percentages of the marked full load current specified in Clause 4.25.3.2 and that combines the functions of overload and overcurrent protection if it is capable of fully protecting the circuit and motor both under overload and short circuit conditions; (b) A protective device, integral with the motor, responsive to motor current, or to both motor current and temperature providing such device will protect the circuit conductors and control equipment, as well as the motor; or (c) An overload protector included as part of the assembly.

4. 25. 2 .6 For hermetic refrigerant motor compressors, overload protection shall consist of one of the following: (a) A separate overload relay that is responsive to motor compressor current and will trip at not more than 140% of the rated load current of the motor compressor marked on the equipment; (b) A thermal protector integral with the motor compressor that complies with the applicable requirements in CSA Standard C22.2 No. 140.2; (c) A fuse or circuit breaker responding to motor current and rated at not more than 125% of the rated load current of the motor compressor marked on the equipment. The product shall start and operate as intended with the fuse or circuit breaker provided; or (d) A protective system that complies with the applicable requirements in CSA Standard C22.2No. 140.2.

4. 25.2 .7 A three—phase motor shall be provided with overload protection as follows: (a) three overcurrent units; or (b) thermal protectors, a combination of thermal protectors and overcurrent units, or another method of protection, where the specific protective arrangement has been investigated and found to provide protection under primary, single—phase fault conditions when power is supplied from transformers connected wye—delta or delta—wye.

4. 25. 2 .8 Fuses used as separate overload protection of motors shall be of the time delay type and shall not be used unless the motor is adequately protected by a fuse of the largest size that can be inserted in the fuseholder.

4.25.2.9 Motor protective devices shall be connected to the ungrounded side of the circuit.

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4.25.3 Short Circuit Protection

4.25.3.1 Motor overcurrent protective devices and thermal protective devices shall comply with the applicable short—circuit requirements for the class of protective device when tested in accordance with Clause 6.27.

4.25.3.2 Except as indicated in Clause 4.25.3.3, an overcurrent protective device, or a thermal protective device employed on equipment having more than one motor, shall withstand short—circuit and ground fault conditions in accordance with the short—circuit test, Clause 6.27, without creating a fire or shock hazard.

4.25. 3. 3 The short—circuit tests specified in Clauses 4.25.3.1 and 4.25.3.2 may be waived if (a) the thermally protected motor or separately enclosed motor overload protective device is within the outer cabinet; (b) the motor or device is intended to be protected by the overcurrent protective device as specified on the unit nameplate, or is provided as part of the product and is acceptable for the branch circuit protection; (C) the assembly is constructed so that flame and molten metal will be confined within the cabinet; and (d) there is no combustible material, except electrical insulation below the motor or protective device.

4.25.3.4 Plug fuses shall not be used in circuits exceeding 150 V to ground; screw shells of plug fuses shall be connected to the load side of the circuit.

4.25.3.5 If equipment is intended to be connected to the identified conductor of a power supply circuit, screw shells of plug fuseholders and the terminal of extractor type fuseholders adjacent to the panel in which they are mounted shall be connected to the load side of the circuit.

4.25.3.6 If a fuseholder is incorporated in the product or in a remote control assembly, the product manufacturer need not ship the fuses with the product or with the remote control assembly, provided that the fuse ratings and type and class numbers, etc, if necessary, are included on the adjacent fuse replacement label (see Clause 5.11).

4.26 Transformers

4.26.1 Transformers shall comply with the applicable requirements of CSA Standard C22.2 No. 66.

4.26.2 Transformers that supply Class 2 circuit voltages shall be of the

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isolating type.

4.26.3 Where a combination of transformer and thermal overload or overcurrent protective device is required for extra—low voltage secondary circuits to meet Class 2 requirements, the combination shall comply with the applicable requirements of CSA Standard C22.2 No. 66.

4.26.4 Transformers other than Class 2 types shall be provided with overcurrent protection in accordance with the Canadian Electrical Code, Part I, Section 26.

4.27 Electric Lighting Equipment

4.27.1 Incandescent Lighting Circuits

4.27.1.1 If the equipment has an identified conductor, a lampholder supplied as part of the equipment shall be wired so that the screw shell will be connected in the identified conductor circuit.

4. 27.1. 2 Lampholders having paper liners shall not be used in moist or damp locations.

4.27.1.3 Lamps shall be protected from damage, either by their location, by the type of lampholder, or by provision of a guard. The guard shall be secured so that it is unlikely to be broken or dislodged during normal use.

4. 27 .1. 4 Means shall be provided to prevent the installation of a lamp having a rating exceeding that of the switch by which it is controlled (see Clause 5.9).

4.27.1.5 Lamps located in walk—in coolers shall be installed in totally enclosed gasketed fixtures.

4.27.1.6 In accordance with the Canadian Electrical Code, Part I, Section 30, equipment having incandescent lighting circuits shall be provided with overcurrent protection rated or set at not more than 20 A for medium base lanipholders or 40 A for mogul base lampholders, unless the equipment branch circuit overcurrent

protection complies with the above requirements.

4.27.2 Electric—Discharge Lighting Circuits

4.27.2.1 Equipment for use with electric—discharge lighting circuits in

equipment shall be designed for an open—circuit voltage of not more than 1000 V and shall be of a type suitable for the application.

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4.27.2.2 Equipment having electric_discharge lamps shall be provided with one or more ballasts designed for the operation of lamps of the size intended to be used in the cabinet.

4.27.2,3 A fluorescent luminajre provided with a ballast that involves an open-circuit secondary voltage of more than 300 V shall be provided with a lampholder of the circuit—interrupting type at the low voltage end of the ballast output. The lampholder at the high voltage end shall be rated at 600 V or more. Notes: (1) Lampholders rated at 250 V may be employed at the high voltage end if supplementary insulation consisting of 0.4 mm (0.016 in) thick fibre or phenojjc Composition or a permanent air spacing of riot less than 2 mm (0.78 in), is provided between the back of the lampholder and the metal of the fixture. (2) Recessed double-contact lampholders for use with 800 and 1500 mA rapid-start lamps need not be of the circuit-interruptjng type.

4. 27. 2. 4 Lampholders shall have a pulse rating suitable for the lamp starting Voltage.

4. 27.2.5 If the voltage in an electric_discharge circuit exceeds 300 V1 the design shall be such that no Uninsulated live parts will be accessible when the lamps are in place or while they are being inserted or removed. Each of the following types of construction shall be considered

as being in compliance with this requiremen (a) a lampholder having recessed, inaccessible contacts and designed for use with lamps having recessed, inaccessible contacts; (b) a lampholder SO designed and wired that, when the lamp is removed, the voltage in the lamp circuit is less than 300 V; or Cc) a design such that the primary circuit will be open during the relainping operation and all live parts will be inaccessible when the lamps are removed and the primary circuit IS reestablished.

4. 27. 2.6 In accordance with the Canadian Electrical Code, Part I, Section 30, equipment having electric—discharge lighting circuits shall be provided with overcurrent protection rated or set at not more than 20 A, unless the equipment branch circuit overcurrent protection complies with the above requirementg

4. 27. 2.7 Lamps shall be protected from damage as described in Clause 4.27.1.3.

4.27.3 Ballasts

4. 27. 3 .1 Ballasts for use with electric_discharge lamps shall comply with

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the requirements of CSA Standard C22.2 No. 74.

4. 27. 3 .2 Ballasts installed within the refrigerated compartment or in other locations where they may be subjected to moisture shall be of a compound-filled type that is suitable for the application.

4. 27. 3.3 Ballasts of other than the simple reactance type shall be of the thermally protected type.

4.27.3.4 If ballasts are installed so that thermal insulation may cause overheating, so that they are subjected to external heat, or so that they are mounted at more than one level within a common enclosure, they shall be tested in accordance with Clause 6.5.

4.27.3.5 The requirements of Clause 4.27.3.4 may be waived for ballasts on equipment that employs (a) not more than one lighting ballast; (b) two 2—lamp 20 W ballasts mounted side by side, provided that the spacing between the sides of the ballasts is not less than 19.1 mm (3/4 in); (c) four or more single—lamp 20 W ballasts mounted in pairs, provided that the spacing between the sides of the ballasts in each pair is not less than 50.8 mm (2 in) and the spacing between the ends of adjacent pairs is not less than 102 mm (4 in); or (d) ballasts other than described in Items (b) and (C) provided that the spacing between any two ballasts is not less than 25.4 mm (1 in) when arranged end to end and not less than 102 mm (4 in) when arranged otherwise.

4.27.3.6 Ventilating openings shall not affect the strength of an enclosure in which ballasts are mounted. A slot or louvre shall be not more than 9.52 mm (0.375 in) wide or more than 968 nirn2 (1.5 in2) in area. Any other ventilating openings shall be not more than 12.7 mm (0.5 in) in diameter, or 12.7 mm (0.5 in) square. Ventilating openings shall not be located in the top or, bottom of an enclosure mounted on a vertical surface and shall be located not less than 127 mm (5 in) from surfaces of combustible material, except that openings in an enclosure surface perpendicular to or facing away from a combustible surface shall be not less than 12.7 mm (0.5 in) from such material.

4.28 Capacitors

4.28.1 Compressor motor starting and running capacitors shall be within a separate enclosure except that if a capacitor is protected against damage by the outer cabinet of the equipment, a separate enclosure for the capacitor is not required. 4.28.2 If the container of an electrolytic capacitor is constructed of



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metal, the container shall either be permanently insulated from non—current—carrying metal parts by moisture—resistant insulation not less than 0.66 mm (0.026 in) thick, or shall be separated from non—current—carrying metal parts by spacings in accordance with Table 2.

4.28.3 Paper capacitors shall be impregnated or enclosed to exclude moisture.

4.28.4 Electrolytic or other special types of capacitors and capacitors intended for connection directly across the line shall comply with the applicable requirements of CSA Standard C22.2 No. 1.

4.29 Switches and Controls

4.29.1 Switches and controls (including thermostats, relays, and pressure controls) shall comply with the applicable requirements of CSA Standards C22.2 No. 14, C22.2 No. 24, and C22.2 No. 55, and, where applicable, shall comply with overload and endurance tests specified in Clause 6.12.

4.29.2 A switch or other control device shall be rated for at least the voltage of the circuit in which it is used and shall have a current—interrupting capacity not less than the load it controls, and shall comply with the requirements of Clauses 4.29.3 and 4. 29.4.

4.29.3 Except as otherwise specified in Clauses 4.29.4 to 4.29.7, switches and other control devices used for motor control or as motor disconnect means shall be rated in accordance with the applicable requirements in the Canadian Electrical Code, Part I, Section 28.

4.29.4 A switch or control device used as a disconnect means for one or more motors (including a compressor) shall be rated at 115% of the full load current of the largest motor in the group plus the sum of the full load currents of all other motors in the group which may be operated at the same time.

4.29.5 A switch or other control device used in a circuit that may include one or more motors and some other load, and that may break the circuit under locked—rotor conditions shall have a current— interrupting capacity not less than the total of the locked—rotor motor current of the largest motor and the other load (see Clause 6.12.1).

4.29.6 A switch for incandescent lighting circuits shall have a suitable "T" rating of not less than the ampere rating of the load it controls (see Clause 5.9).



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4.29.7 A switch controlling one or more electric—discharge lamps shall have a suitable "F" rating or a current rating of not less than twice the total marked current rating of the ballasts and other

equipment it controls.

4.29.8 A switch or other control device that controls one or more electric discharge lamps or performs a safety function shall not be connected in the circuit of the identified conductor.

4.29.9 A defrost timer control is not required to be provided on remote type equipment if the equipment is marked in accordance with Clause 5.15.

4.30 Protection of Water Heaters

4.30.1 Equipment that has a water heating tank that is not vented to the atmosphere shall have a temperature regulating thermostat to control the heating element so that the temperature of the water in the tank will not exceed 90°C, and a temperature limiting means that will prevent the temperature of the water in the tank from

exceeding 96°C in case of failure of the regulating thermostat.

4.30.2 Equipment that has a water heater that may operate when dry shall be provided with a protective device that will open the power supply or reduce the power input to the heating element to prevent unsafe operation, as determined by the test in Clause 6.11.6(b). Note: Such protection is unnecessary on appliances constructed so that they may be operated safely, when dry, at maximum rated voltage. Heating elements are not considered protective devices.

4.30.3 Fusible links provided in appliances to prevent hazardous

temperatures due to abnormal operation shall be constructed or enclosed so as to prevent tampering and shall operate without short—circuiting or grounding of live parts.

4.30.4 Reset levers or buttons of manually—reset protective devices shall be recessed or guarded so that the protective device cannot be operated accidentally.

4.30.5 The design of the protective device shall be such that its purpose cannot be defeated.

4.31 Heater Elements

4.31.1 Heater elements shall comply with the applicable requirements of CSA Standard C22.2 No. 72.

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4.31.2 Heater elements shall be supported in a substantial and reliable manner, and shall be protected against mechanical injury and contact with outside objects.

4.31.3 A heater element shall not create a fire or shock hazard when operated under abnormal conditions as specified in Clause 6.11.6.

4.32 Electric Defrost Heaters

4.32.1 An electric defrost heater assembly that may be exposed to water during defrost shall be sealed or constructed to prevent hazardous current leakage. The heater assembly shall not be affected adversely by the temperature or moisture to which it may be subjected.

4.32.2 Materials used for insulating and sealing the heater terminals shall have suitable aging and dielectric properties at the temperatures and moisture conditions involved, and shall comply with the requirements of Clause 6.8. Note: The use of rubber caps vulcanized to the heater leads and heater sheath is an acceptable means of sealing terminals provided that the material has a wall thickness not less than that of the conductor insulation and has suitable aging and dielectric properties at the temperatures and moisture conditions involved.

4.32.3 Metal tubing forming the heater element enclosure shall be constructed of corrosion—resistant material or shall be suitably plated, dipped, coated, or otherwise treated to resist external corrosion, and shall be suitable for the temperatures to which it is subjected.

4.32.4 Any part of the defrost assembly on which a temperature exceeding 90°C may be attained shall be located or guarded so that organic material cannot normally come, in contact with it after installation.

4.32.5 Electrically heated defrost evaporator trays shall be secured in place by means that require the use of a tool for their removal.

4.33 Electric Grid Heaters

4.33.1 An electric grid heater shall be supplied from an extra—low voltage Class 2 circuit as defined in Clause 2.1 unless it can be determined that the grid circuit will not create a shock or fire hazard under abnormal conditions as determined in Clause 6.11.6.

4.33.2 An electric grid heater shall be substantially constructed. It

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shall be insulated from non—current—carrying metal parts with insulation that will withstand moisture, and shall be capable of withstanding the dielectric strength test, specified in Clause 6.10, when wetted after the harvest cycle.

4.33.3 An electric grid heater including the interconnecting wiring shall be separated or segregated from low voltage parts or wiring as specified in Clause 4.36.

4.34 Electric Crankcase Heaters

4.34.1 An electric crankcase heater assembly shall be constructed of materials suitable for the temperatures to which it may be subjected in the unit.

4.34.2 The heater element may be enclosed in metallic sheathing, or may be resistance wire insulated to comply with these requirements, and installed so as to be protected against damage in its intended, normal use. Metallic enclosed heater elements may be insulated from the sheath with magnesium oxide, porcelain beads, or other materials having heat resisting properties.

4.34.3 To comply with Clause 4.34.1, a heater case or a terminal seal of rubber or thermoplastic materials shall have suitable aging properties for temperatures measured during heating tests as determined by material temperature rating properties.

4.34.4 If moulded seal caps are provided, the wall thickness of material covering splice connections shall be equivalent to the required minimum thickness of insulation on the heater leads.

4.34.5 Metal tubing forming a heater element enclosure shall be constructed of corrosion—resistant material, or shall be plated, dipped, coated, or otherwise treated to resist external corrosion, and shall be suitable for the temperatures to which it is subjected.

4.34.6 Uncoated copper tubing may be used for temperatures of 200°C (392°F) and lower; metallic coated copper tubing is acceptable for temperatures below the melting temperatures of the coating. tJncoated or oxide coated steel tubing is not acceptable as a crankcase heater sheath. Plated steel tubing may be employed if the plating is determined to be corrosion—resistant, and will withstand the temperatures to which it may be subjected. Aluminum tubing may be employed if the alloy withstands the abnormal tests as specified in Clause 6.11.6 without melting or other breakdown. Stainless steel tubing such as ASTM Type 304 is acceptable for crankcase heater sheaths.

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4.35 Spacings

4.35.1 Spacings shall be not less than those shown in Table 2, except as noted in Clause 4.35.2. If uninsulated live parts are not rigidly supported, or if movable non—current—carrying metal parts are in proximity to uninsulated live parts, the construction shall be such that the specified minimum spacings will be maintained under all conditions.

4.35.2 An insulating barrier or liner may be used to obtain the required spacings provided that it is (a) of adequate dielectric strength and resistant to moisture (see Clause 6.20); (b) not adversely affected by arcing and suitable for the temperature encountered; (C) of adequate mechanical strength and permanently retained in place by means other than adhesives; (d) not less than 0.66 ruin (0.026 in) thick, except that it may be as thin as

(i) 0.33 rum (0.013 in) if used with a spacing that is not less than one—half of that required before the barrier is applied; or

(ii) 0.25 mm (0.010 in) thick if it is of mica or other equivalent insulating material of a suitable thickness to comply with the requirements of Items (a) and (b). Such parts shall be held in position between the parts involved by mechanical means (no spacing required). Adhesive shall not be relied upon to fix such insulation in place.

4.35.3 Electronic Circuits on Printed Circuit Boards

4.35.3.1 Spacings between uninsulated live parts of a circuit containing a component such as a rectifier, a resistor, a capacitor, a transistor, or other solid—state device, and (1) grounded non- current—carrying metal parts, including the enclosure, and (2) other circuits, shall be in accordance with Table 3.

4.35.3.2 Spacings between live parts of different voltages in a circuit containing a component as mentioned in Clause 4.35.3.1 are not specified if (a) the spacings between such circuits are capable of withstanding the dielectric, strength test specified in Clause 6.10; (b) no risk of fire or electric shock results from the tests described in Clause 6.21; or (C) the location and relative arrangement of components are such that acceptable separation will be maintained.

4. 35.3.3 The requirements in Clauses 4.35.3.1 and 4.35.3.2 do not apply to extra—low voltage Class 2 circuits nor to extra—low voltage and low voltage secondary circuits in which the short—circuit power between

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conductors is limited by an isolating transformer to 150 V.A* and no fire hazard will result from the short circuit. *For purposes of this requirement, the short-circuit volt ampere limit is defined as the product of the open-circuit volts and the short—circuit amperes of the transformer; these are rms values in ac circuits. Suitable resistance or inductance externally connected in series with the secondary winding of the transformer may be used to limit the short-circuit current to comply with these power limitations. 4.35.4 Where higher than rated potential is developed in a motor circuit through the use of capacitors, the rated voltage of the system shall be employed in applying the spacings indicated in Clause 4.35 unless the developed steady—state potential measured in Clause 6.3 exceeds 500 V, in which case the developed potential is to be used in determining the spacings for the parts affected.

4.35.5 Extra—Low Voltage Safety Control Circuits

4.35.5.1 Note: No spacings are specified for extra-low voltage Class 2 circuits not used as safety circuits. If an extra—low voltage control circuit is used as a safety circuit in accordance with Clause 4.23.10.1, and a short circuit between the parts may result in unsafe operation of the equipment, spacings shall be not less than those specified as follows: (a) The spacing between an uninsulated live part and the wall of a metal enclosure, including fittings for the connection of conduit or cable, shall be not less than 3.2 mm (0.125 in). A greater spacing may be required if, because of its size, shape, or the material used, the enclosure is not sufficiently rigid to maintain the required spacing; (b) The spacing between wiring terminals, regardless of polarity, and between a wiring terminal and a non-current—carrying metal part (including the enclosure), which may be grounded when the equipment is in use, shall be not less than 6.35 mm (0.250 in); and (c) The spacing between uninsulated live parts, regardless of

polarity, and between an uninsulated live part and a non—current—

carrying metal part, other than the enclosure, which may be grounded when the equipment is in use, shall be not less than 0.8 mm (1/32 in), provided that the construction of the parts is

such that spacings will be maintained.

4.35.5.2 Spacings through air as specified in Table 2 and in Clause 4.35.5.1

may be obtained by barriers that shall (a) comply with Clause 4.24; (b) be not less than 0.66 mm (0.026 in) thick if spacings before the barrier is applied are less than half those specified; (C) be not less than 0.33 mm (0.013 in) thick if spacings before the barrier is applied are not less than half those specified; and

(d) be reliably held in place. Note: Insulating materials having a thickness less than that specified in Clause 4.35.5.2 may be used if upon investigation they are found to have mechanical and electrical properties adequate for



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all conditions of service.

4.35.6 All uninsulated live parts connected to circuits of different voltage shall be spaced from one another as though they were parts of opposite polarity in accordance with the requirements of Table 2 for the highest voltage involved (see Clause 4.36).

4.35.7 The spacings between uninsulated live parts in electric discharge lighting circuits and non—current—carrying metal parts and the enclosure shall not be less than 12.5 mm (0.5 in) for potentials 600 V or less and not less than 19.1 mm (0.75 in) for potentials of 601 to 1000 V.

4.36 Separation of Circuits

4.36.1 Insulated conductors of circuits that operate at different voltages shall be separated by barriers or shall be segregated from each other unless all the conductors are insulated for the highest voltage, and shall in any case, be so separated or segregated from uninsulated live parts connected to circuits of different voltage, or to conductors of opposite polarity. Note: Segregation of insulated conductors may be accomplished by clamping, routing, or equivalent means that ensure permanent separation from insulated or uninsulated live parts of a different circuit.

4.36.2 Equipment that requires the field installation of insulated conductors that operate at different voltages, or at voltages different from that of insulated conductors in the equipment, shall be constructed so that there will be a permanent separation of conductors of different voltage, unless all the conductors are insulated for the highest voltage.

4.36.3 Equipment shall be constructed so that field—installed conductors will be segregated or separated by barriers from (a) uninsulated live parts of opposite polarity or of a circuit of different voltage; (b) any uninsulated live parts of electrical components such as a pressure limiting device, motor overload protective device, or other protective device, where short—circuiting or grounding may result in unsafe operation of the unit. Note: The difference in voltage referred to in Clauses 4.36.1 to 4.36.3 is a difference that would ordinarily permit a difference in level of insulation.

4.36.4 If a barrier is used to provide separation between the wiring of different circuits, it shall be of metal, or of suitable insulation material of adequate mechanical strength, and reliably held in place.



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4.37 Grounding and Bonding Equipment shall be constructed to comply with the requirements of CSA Standard C22.2 No. 0.4.

4.38 Receptacles

4.38.1 General purpose receptacles shall comply with CSA Standard C22.2 No. 42 and special—use receptacles shall comply with CSA Standard C22.2 No. 182.3.

4.38.2 Overcurrent protection shall be provided as part of the equipment for each receptacle or lighting circuit included in the equipment unless (a) the receptacle or lighting circuit is intended to be connected to a power supply separate from that supplying the equipment; (b) the equipment can be connected to a branch circuit rated at not more than 15 A in accordance with the Canadian Electrical Code; or (c) the receptacle is intended for use only with specific accessories.

4.38.3 Unless supplied by a separate branch circuit, the receptacle shall be marked with the total input current. If the protective device required by Clause 4.38.2 is a fuseholder, the maximum fuse size shall be marked adjacent to the fuseholder (see Clause 5.11).

4.39 Plumbing Requirements Electric drinking fountains and water coolers having provision for connection to a municipal or other pressurized potable water supply and/or public sewer system shall comply with the applicable requirements of the CAN/CSA—345 Series, CSA Standards on Plumbing Fixtures.

5. Marking

5.1 Markings shall comply with the requirements of CSA Standard C22.2 No. 0. Adhesive nameplates shall comply with the applicable requirements of CSA Standard C22.2 No. 0.15.

5.2

Markings shall be permanent and be located on one or more permanent labels (or equivalent), readily visible after installation, without the use of tools. The markings shall not be located on any panel that can be removed without the use of tools, except (a) the markings may be located on a panel that would be removed for installation or service, provided the panel must be in place for the intended operation of the equipment; (b) if the markings are located on a removable cover, duplicate



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markings including the electrical rating, model designation, and a note to see markings on cover, are located on the inside of the unit; or (c) the marking on a unit intended for built—in installation may be located behind a louvred panel or grille that may require tools for removal.

5.3 The equipment shall be marked, in accordance with Clause 5.2, with the following: (a) The manufacturer's name, trademark, tradenarne, or other recognized symbol of identification; (b) The catalogue style, model, or other type designation; (c) The rated input voltage; (d) The frequency or frequencies; (e) The total or individual loads in amperes (see Clauses 5.4 and 5.5); (f) For each refrigerating system high and low side design pressures as determined in Clause 4.9.3 on remote and factory— charged equipment, except that only high side design pressures are required on high side components (condensing units) and only low side design pressures are required on low side components (evaporator units); (g) For each refrigerating system the type and weight of refrigerant, except that the weight need not be shown on remote equipment; (h) For milk coolers the duty rating (ie, every—day or every— other—day pickup) *; *May be indicated by abbreviations E.D. and E.O.D. respectively. (i) The month and year of manufacture, at least, shall be marked in a location accessible without the use of tools. Date coding, serial numbers, or equivalent means may be used; and (j) The statement: FOR OUTDOOR USE (or equivalent) where applicable.

5.4 Cord—Connected Equipment

5.4.1 Cord—connected equipment shall be marked with one or both of the following, as applicable: (a) The total load in amperes of the refrigeration system and other concurrent loads, including the protective device rating of a receptacle, if provided; or (b) The total load in amperes of an electric defrost system and other concurrent loads, if this load exceeds that in (a) above.

5.4.2 Cord—connected equipment that requires its supply circuit to be protected by a time delay fuse to permit starting, operation, or defrosting (see Clause 6.13) shall be visibly marked with the following, or equivalent, wording:

IF CONNECTED TO A CIRCUIT PROTECTED BY FUSES, USE TIME DELAY FUSE MARKED D

and



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SI CETTE MACHINE EST CONNECTE A UN CIRCUIT PROTEGE PAR DES FUSIBLES, EMPLOYER DES FUSIBLES A ACTION DIFFEREE MARQUES D

5.5 Permanently Connected Equipment

5.5.1 Permanently connected equipment shall be marked with the total load in amperes as specified in Clause 5.4.1, or shall be marked with the following: (a) For hermetic refrigerant motor compressors, the rated load amperes as determined by Clause 6.3 and locked—rotor amperes; (b) The horsepower and full load amperes of each motor, except motors smaller than 1/8 hp may be rated in watts or amperes; (C) The load in amperes of other loads; (d) The minimum circuit ampacity for each circuit as calculated in Appendix C, except as specified in Clause 5.5.2; and (e) The maximum overcurrent protective device type and size for each circuit as calculated in Appendix C, except as specified in Clause 5.5.2. Note: Where the overcurrent protective device is a fuse, it shall be considered to be a "time delay" "D" type unless otherwise specified.

5.5.2 Equipment of the sectional type intended to be interconnected and grouped in the field and supplied by a single branch circuit need not be marked with the minimum circuit ampacity and maximum overcurrent protection. However, the wiring diagrams on the equipment, together with the nameplate information, shall provide the necessary information and instructions for the determination of minimum circuit ampacity and maximum overcurrent protection for the number of units to be grouped.

5.5.3 Unless the proper wiring connections of permanently connected equipment are plainly evident, wiring terminals shall be marked or the equipment shall be provided with a suitable wiring diagram to indicate the connections.

5.5.4 Equipment designed for connection to more than one branch circuit shall include the following warning, or equivalent, adjacent to each point of supply entry:

WARNING: MORE THAN ONE SOURCE OF ELECTRICAL SUPPLY. DISCONNECT ALL SOURCES BEFORE SERVICING

and

AVERTISSEMENT : PLUS D'UNE SOURCE D'ALIMENTATION. AVANT LE DEPANNAGE, COUPER TOUTES LES SOURCES D'ALIMENTATION.

5.6 The electrical rating of a controller for an external load shall be shown on the nameplate unless the rating marked on the controller



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can be read without requiring tools for removal of panels, etc.

5.7 A motor Controller having a manual—reset type overcurrent protective device that may be field—adjusted to an automatic—reset type shall be clearly marked to indicate that the controller is not to be adjusted to permit automatic—reset operation unless it has been determined that the motor is suitably protected by the controller when this change is made.

5.8 If the screw shell of a plug type fuseholder, or the terminal of an extractor post type fuseholder that is adjacent to the panel in which it is mounted is not at ground potential when the fuse is removed, the equipment shall be marked in a permanent manner, in a location readily seen when replacing the fuse, with a caution:

DISCONNECT SUPPLY BEFORE CHANGING FUSE;

and

COUPER L'ALIMENTATION AVANT DE REMPLACE LE FUSIBLE.

5.9 The type and maximum rating of any incandescent lamps permitted shall appear on or adjacent to the lampholder.

5.10 For equipment requiring field—provided motor overload protection, the equipment shall have markings readily visible stating this fact, and indicating that the motor overload protective devices shall be rated or selected in compliance with the Canadian Electrical Code, Part I.

5.11 A replacement marking shall be provided for fuses or overload protective heater elements Supplied as a part of a product or remote control assembly. The marking shall be visible when the cover or door of the compartment is opened. The marking shall specify (a) the rating of the fuse in amperes; (b) per Clause 4.23.10.5, the fuse manufacturer's or private labeller's name, catalogue number, and voltage rating; and

(C) the manufacturer and model designation of the overload protective heater element.

5.12 If the temperature in the compartment intended for field connection of the supply circuit conductors exceeds 60°C, as determined during the tests in Clauses 6.4 to 6.8, the equipment shall include the

following statement, or equivalent, in the vicinity of the point of field connection:

USE SUPPLY WIRES SUITABLE FOR AT LEAST °C

and

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EMPLOYER DES FILS D'ALIMENTATION A _____°c.

5.13 Electric drinking fountains and water coolers complying with the applicable additional plumbing requirements of CAN/CSA-B45 shall have the wording "Electrical and Plumbing" and "Electrique et Plomberie" located adjacent to the agency approval marking.

5.14 For equipment that requires installation clearances to be maintained in order to comply with the tests in Clauses 6.4 to 6.7, the clearances shall be marked on the equipment or shall be provided with the installation instructions.

5.15 As required by Clause 4.29.9, remote type equipment without an integral defrost control shall include a statement such as DO NOT EXCEED MINUTES ON DEFROST CYCLE (or equivalent).

6. Tests

6.1 General

6.1.1 Except as otherwise indicated, one representative sample shall be subject to the tests described in Clauses 6.3 to 6.28.

6.1.2 Rated Voltage Except where otherwise specified, the test voltage shall be the nominal system voltage for the supply system in which the equipment is intended to operate. Nominal system voltage (eg, 120 V) is that specified in CSA Standard CAN3—C235. For equipment that is rated for dual—voltage operation (ie, 208/240 V), tests shall be conducted at the rated nominal system voltage causing the greatest temperature rise.

6.1.3 Rated Frequency Equipment rated for a range of frequencies, or for dual—frequency operation, shall be tested at the frequency that will produce the greatest temperature rise.

6.1.4 Installation Clearances During the normal load tests, the equipment shall be installed within a test enclosure that maintains the installation clearances and ventilation openings specified by the manufacturer. The enclosure shall be constructed of plywood not less than 9.5 mm (3/8 in) thick and its inner surfaces shall be painted black. Where no clearances are specified, a clearance of zero shall be maintained unless it is obvious that the equipment would not be enclosed in any manner (such as walk-in cooler doors, compressor units, remote condensers, etc). Where the equipment is intended to be operated on a combustible floor, the equipment shall be



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supported on fir plywood 9.5 mm (3/8 in) thick, painted black.

6.2 Conditions for Normal Load Tests

6.2.1 Nonrefrigerated Equipment

6.2.1.1 Except where otherwise specified, the ambient temperature during normal load tests shall be 25°C (77°F).

6.2.1.2 The equipment shall be operated under the normal load conditions (including no load), as specified by the manufacturer, that produce the greatest temperature rise.

6.2.1.3 Equipment that includes a pressurized product system shall be operated at the highest adjustable setting of the pressure— regulating device on the pressurized product system.

6.2.2 Refrigerated Equipment

6.2.2.1 Except where otherwise specified, the ambient temperature shall be 25°C (77°F). During normal load tests the ambient temperature shall be (a) 40°C (104°F) for equipment with air—cooled condensers or air— and water—cooled condensers; and (b) any convenient temperature above 21.1°C (70°F) for equipment with water—cooled condensers.

6.2.2.2 For equipment with air—cooled condensers, the equipment shall be conditioned in 40°C (104°F) ambient air prior to test with all doors and lids open and with the unit inoperative until the entire equipment reaches the ambient temperature. Following the conditioning, all doors and lids shall be closed and the temperature control shall be set to the coldest position and then the equipment shall be started and operated.

6.2.2.3 For equipment with a water-cooled condenser, the rate of flow of water to the condenser shall be adjusted to maintain an inlet water temperature of 26.7°C (80°F) and an outlet water temperature of 38°C (100°F). During the test, the temperature control shall be set to the coldest position and then the equipment shall be started and operated.

6.2.2.4 For equipment with an air— and water—cooled condenser, the equipment shall be conditioned and operated as specified in Clause 6.2.2.2. During the test, water shall not be circulated through the condenser.

6.2.2.5 For remote systems in which equipment is intended to be connected



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in the field to remote condenser or evaporator units, the equipment shall be conditioned and operated in accordance with the applicable requirements in Clauses 6.2.2.2, 6.2.2.3, or 6.2.2.4. Only remote systems in which the manufacturer specifies the evaporator or condenser units to be connected to the equipment are required to be tested.

6.2.2.6 Any loads that may operate concurrently with the condensing unit shall be energized during the tests. Unless supplied from separate branch circuits, the maximum rated load to any convenience receptacles shall also be connected.

6.2.2.7 Pressure limiting devices, motor protective devices or manual—reset devices shall not be actuated by continuous operation of the equipment. Automatic—reset protective devices shall be allowed to cycle during the starting or pull—down period, provided that the temperature within the refrigerated compartment continues to decrease until the device stops cycling.

6.2.2.8 The equipment shall have provision for monitoring the high and low side pressures of the refrigeration system, as required by Clause 4.9.1.

6.2.2.9 Equipment that includes a pressurized product system shall be operated at the highest adjustable setting of the pressure— regulating device on the pressurized product system.

6. 2. 2 .10 Normal load conditions for specific types of refrigerated equipment, in addition to the conditions outlined in Clauses 6.2.2.1 to 6.2.2.8, are specified in Clauses 6.2.3 to 6.2.7.

6.2.3 Drinking Water Coolers and Beverage Dispensers

6.2.3.1 The temperature of drinking water entering pressure type coolers shall be 26.7°C (80°F).

6.2.3.2 The bottle or other container used in bottle type water coolers, batch (impounded liquid) type beverage dispensers, or premix type carbon dioxide pressurized beverage dispensers shall be filled with water at 37.8°C (100°F).

6.2.3.3 The liquid withdrawn from equipment during the test shall be diverted from the precooler (if any).

6.2.3.4 Thermostats that control water heater operation shall be at the hottest setting during the test period.

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6.2.3.5 Equipment having a refrigerated water bath (including ice bank types) shall be operated through the preparatory pull—down period according to the manufacturer's instructions before commencing tests in which liquid is to be withdrawn.

6.2.3.6 Rate of Withdrawal of Liquid

6.2.3.6.1 Except as provided in Clauses 6.2.3.7.2 to 6.2.3.7.4, the average rate of withdrawal of liquid during the test shall be the same as the manufacturer's published capacity rating for operation at temperature conditions listed below: ambient 32.2°C (90°F) water in 26.7°C (80°F) water out 10°C (50°F) Note: Where equipment has a precooler, the maximum published capacity rating (for the temperature conditions listed above) is selected for the rate of withdrawal, notwithstanding Clause 6.2.3.3.

6.2.3.6.2 Whenever a manufacturer's rating is published for temperature conditions that do not include those specified in Clause 6.2.2.1, the average rate of withdrawal of liquid during the test shall be the same as a capacity rating estimated by the testing authority to be a reasonable one for the temperature conditions specified in Clause 6.2.3.6.1.

6.2.3.6.3 Whenever a manufacturer's published capacity rating for beverage dispensers cannot be converted to litres (gallons) per hour on a continuous basis, or an intermittent basis such as referred to in Clause 6.2.3.6.6, or there is no rating available, the testing authority shall establish a rate of withdrawal to be used for the tests in Clauses 6.3 and 6.4 that will take into account (a) the rate of liquid flow that occurs when dispensing valves are fully open; (b) the number of dispensing valves on the equipment; and Cc) an estimate of the total number of "drinks", of 200 mL (7 fi oz) each, per hour that could be withdrawn from the equipment by an experienced person.

6.2.3.6.4 For batch (impounded liquid) type beverage dispensers, no liquid is withdrawn, to avoid reducing the maximum refrigerating load.

6.2.3.6.5 Except as provided in Clause 6.2.3.6.6, the withdrawal of liquid shall be on a continuous basis throughout the test period.

6.2.3.6.6 Whenever a manufacturer's specifications of equipment provide that it is intended to have liquid withdrawn at some stated rate for a limited period of time only, and to have liquid withdrawn at some lesser rate (including zero) for some further period of time, in

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order to recover a cooling capability, the testing procedure shall substantially duplicate the intended method of operation.

6.2.4 Freezer Dispensers for Food and Beverage Products

6.2.4.1 The temperature of the food or beverage mixture used in the test shall be the maximum recommended by the manufacturer of the equipment, but not exceeding 10°C (50°F) if the mixture is a type required to be refrigerated.

6.2.4.2 The mixture used in the test shall be of a kind for which the equipment is designed.

6.2.4.3 The equipment shall be operated at the maximum rate to allow withdrawal of the frozen product continuously or in batches. During this test, the equipment shall be kept filled with fresh mixture.

6.2.5 Ice Making Machines

6.2.5.1 Inlet water to the ice making machine shall be maintained at 26.7°C (80°F).

6.2.5.2 If the machine has a heated water defrost system, the water temperature control thermostat shall be set at the highest temperature position for the temperature test.

6.2.5.3 For ice makers that operate through alternating freeze and harvest cycles, the harvest cycle shall be considered to be equivalent to the temperature (defrost) test (see Clause 6.7).

6.2.6 Milk Coolers

6.2.6.1 Ice bank type coolers shall be tested by filling the water reservoir to its rated capacity with water at 26.7°C (80°F). Where applicable, milk cans shall be filled with water at 35°C (95°F) and placed in the cooler. The number of cans shall be that required to hold one—quarter the rated capacity of the cooler for every—other— day pickup units or one—half the rated capacity for every—day pickup units.

6.2.6.2 Direct expansion bulk type coolers shall be tested by adding water at 35°C (95°F) during a period not to exceed 90 mm, until the tank is one—quarter full for every—other-day pickup units or until the tank is one—half full for every—day pickup units.



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6.2.7 Absorption Type Refrigerators

6.2.7.1 For absorption type refrigerators, if the voltage rating is within the range of 100 and 120 V inclusive or 200 and 240 V inclusive, the refrigerator shall be connected to a supply circuit of voltage sufficient to cause a power input equal to

(120)2 (240)2 orWm

Vm Vm

where Wm = the rated power input Vm the rated voltage

If the rated voltage is more than 120 V or less than 100 V, or more than 240 V or less than 200 V, the refrigerator shall be connected to a supply circuit of voltage sufficient to cause a power input equal to the rated input.

6.3 Rating

6.3.1 The input in amperes shall be measured under the maximum normal load conditions specified in Clause 6.2 after balanced (stable) conditions have been reached (see Clause 6.4.2) and shall not exceed the marked rating, exclusive of the defrost rating, by more than 10%, except that the input to an electric absorption type refrigerator shall not exceed its marked rating by more than 5% when tested at rated voltage in the normally heated condition.

6.3.2 For permanently connected equipment in which the individual loads are marked, the input shall be measured as in Clause 6.3.1 and the individual rating of each load shall not exceed the marked rating by more than 10%.

6.3.3 The measured input in amperes during the defrost cycle shall not exceed the marked rating by more than 10% when tested in accordance with Clause 6.7.

6.3.4 For permanently connected equipment, the rated load amperes of a compressor shall be measured to determine marking as required in Clause 5.5.1(a).

6.3.5 The operating potential of motor circuits involving capacitors shall be determined for compliance with Clause 4.35.4.

6.4 Temperature (Normal Load)

6.4.1 Equipment, when tested under conditions of maximum normal load as described in Clause 6.2, shall not attain a temperature at any



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point sufficiently high to constitute a fire hazard or to affect injuriously any materials employed in the equipment nor show temperature rises at specific points greater than those indicated in Table 5. Equipment levelling screws, if supplied, shall be adjusted so that the equipment is at its lowest level position.

6.4.2 Except as provided in Clause 6.4.4, compliance with the requirements of Clause 6.4.1 shall be determined by operating the equipment under conditions of maximum normal load and, while connected to a supply circuit of test voltage, by selecting a frequency in accordance with Clauses 6.1.2 and 6.1.3. Temperatures shall be measured after balanced (stable) conditions have been reached on components such as fan motor windings, compressor enclosure, and wiring insulation. Freezer dispensers shall also be tested in accordance with Clause 6.4.5.

6.4.3 Temperatures shall be determined either by thermocouples or the rise—of--resistance method, except that, in special cases, one method may be specified. A temperature shall be considered to be constant when three successive readings taken at 5 mm intervals indicate no change. For equipment that is cyclic in nature, the temperature shall be considered constant after the mean temperature between operational peaks is essentially the same.

If thermocouples are used for measuring coil temperatures, temperature rises greater than those specified in Table 5 shall be accepted, provided that the temperature rise as determined by the rise—of—resistance method is within the prescribed limits.

6.4.4 The test specified in Clause 6.4.2 shall also be conducted with test voltages at the extreme operating voltages of the supply system specified in CSA Standard CAN3—C235 (for a nominal system voltage of 120 V, these are 104 and 127 V) with an additional allowance of 20°C (36°F) above the temperatures specified in Table 5.

6.4.5 For freezer dispensers, following the test of Clause 6.4.2, the unit shall continue to operate with the rate of withdrawal of product reduced and the temperature of the mix adjusted to allow continuous operation of the beater motor without tripping a protective device. The maximum temperatures shall be determined and shall not exceed those indicated in Table 5.

6.5 Temperature (Ballasts and Wiring)

6.5.1 Under normal operating conditions, the temperature of the coil of an open type ballast or the enclosure of an enclosed reactor type ballast or other control device used in an electric—discharge lamp system shall not exceed 90°C (194°F). The temperature on the enclosure of an automatic starter shall not exceed 80°C (176°F) and the temperature of the wiring shall not exceed its insulation temperature rating.

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6.5.2 The test required by Clause 6.5.1 shall be conducted with the refrigeratj0 unit in the OFF position, unless the ballasts are so located that they are exposed to heat from components of the refrigeration system. The ballasts and load shall be energized until temperatures, as measured by thermocouples, have become Constant.

6.6 Temperature (Condensation Wiring)

6.6.1 The temperature of the insulation of resistance type heater wire used to prevent condensation in equipment shall not exceed its rated insulation temperature limit when tested under the Conditions outlined in Clause 6.6.2. This test is not required if the heater wire used complies with the requiree of Clause 4.23.7.

6.6.2 To determine compliance with the requiremen of Clause 6.6.1, the heater shall be energized until constant temperatures, as measured by thermocouples on the insulation, are reached. The test shall be conducted at an ambient temperature of

approximately 25°C (77°F) with the refrigerti unit in the OFF position.

6.7 Temperature (Defrost)

6.7.1 A normal hot gas, reverse cycle, or electric heater defrost cycle shall not produce temperatures on combustible material, wiring insulation, motor windings, or the insulation of solenoid—operated valves or other electrical components sufficiently high to constitute a fire hazard or affect the insulating material injuriously, and shall not result in defrost water draining on uninsulated live parts or collecting within enclosures for electrical parts or wiring. The temperature rises at specific points shall be not greater than those indicated in Table 5.

6.7.2 To determine compliance with the requirements of Clause 6.7.1, equipment shall be operated until the evaporator is covered by ice or frost approximately 6 mm (0.25 in) thick, except that if the ice on the equipment may delay the action of the control terminating the defrost cycle, the evaporator shall be heavily iced. The defrost cycle shall be started by closing the circuit to the defrost heater, hot gas, or reversing valve. If the defrost time is determined by an adjustable control, the control is to be adjusted to the factory—set defrost time. If the time is determined by a control not supplied with the equipment, the length of the cycle shall be at least 125% of the defrost time marked on the equipment as specified in Clause 5.15, but not less than 15 mm, except that if no time is marked, the test shall continue until stabilized temperatures are reached. Note: If the cycle is terminated by a control that is responsive to low side temperature or pressure, the time of the cycle is

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automatically determined.

6.7.3 The temperature shall be measured at intervals during the defrost cycle and the electrical input to the defrost circuit shall be measured to determine the acceptability of the switches and controllers.

6.7.4 At completion of the defrost cycle, the assembly shall be examined to see if defrost water has come into contact with uninsulated live parts or has collected within the enclosures of electrical parts or wiring (see Clause 4.4.2).

6.8 Insulation Resistance (Defrost Heaters)

6.8.1 Electric defrost heaters other than those located outside the refrigerated space shall have an insulation resistance of not less than 50 000 2 when tested in accordance with Clause 6.8.2.

6.8.2 To determine the insulation resistance, the heater shall be mounted in a test chamber having a relative humidity of 98% and a temperature of any convenient value above 0°C (32°F). The heater shall be operated at its rated voltage and the heating cycle shall be initiated by a time switch and terminated by a control set to disconnect the heater when the temperature on the sheath reaches that measured in the defrost test described in Clause 6.7. The rate of cycling shall be from 3 to 10 cycles per h and the test shall be continued for a total of 1000 cycles.

6.8.3 The insulation resistance (between the heater leads and the sheath) shall be measured before the test, at intervals during the test, and at the conclusion of the test.

6.8.4 At the conclusion of the test, the heater shall withstand the dielectric strength test specified in Clause 6.10 applied between the heater leads and the sheath.

6.9 Leakage Current

6.9.1 The leakage current of cord—connected equipment intended for use on circuits not exceeding 150 volts—to—ground shall not exceed 0.5 mA when tested in accordance with the requirements of Clauses 6.9.2 to 6.9.11. Where sheathed heating elements are employed, the leakage current requirements are specified in Clause 6.9.12.

6.9.2 The meter may be electronic or a direct indicating type, average responding, calibrated at 60 Hz and indicating the rms value of a pure sine wave, with an accuracy of 5% at an indication of 0.5 mA. The meter shall have a terminal impedance of 1500 ci shunted by a

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0.15 iF capacitor.

6.9.3 The test frequency shall be 60 Hz.

6.9.4 The applied voltage shall be the nominal system voltage.

6.9.5 The test circuit shall be as shown in Figure 3.

6.9.6 The equipment shall be at room temperature with all Controls in the ON position and switch Si open and also tested within 5 s of applying the test voltage (switch Si closed) and again after

reaching normal operating temperatures. Equipment with temperature controls shall be tested at low, medium, and high settings of the controls.

6.9.7 The grounding conductor of cord—connected equipment having a

grounding circuit shall not be Connected to ground except through the test meter.

6.9.8 The tests shall be conducted with switch S2 in Position A and repeated with the switch in Position B.

6.9.9 The probe shown in Figure 3 shall be of metal and shall be applied to any exterior metal part.

6.9.10 Equipment shall also meet the requirements of Clause 6.9.1 after being conditioned for 24 h to a relative humidity of 85 5% at a

temperature of 32 2°C (89.6 3.6°F).

6.9.11 The leakage current test of equipment having insulating material for the enclosure, or part of the enclosure, shall have the test

probe in contact with metal foil with an area 10 x 20 cm, which, in turn, is in contact with accessible areas of the insulating material. The foil shall not remain in place long enough to affect normal operation, drainage, and ventilation.

6.9.12 Equipment having sheathed heating elements may exceed the 0.5 mA leakage current specified in Clause 6.9.1 for the first 10 mm after power is first applied, but shall not exceed 5 mA leakage current from 5 s after the power is applied until 10 mm after the power is applied.

6.10 Dielectric Strength

6.10.1 The equipment shall withstand, Without breakdown, for a period of

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1 mm, the application of the following 60 Hz voltage between live parts and exposed non—current—carrying metal parts: (a) 1000 V for a circuit including a motor rated at less than 1/2 hp, and 250 V and less; (b) except as specified in Clause 6.10.2, 1000 V plus twice the rated voltage of the motor, for a circuit including a motor rated at 1/2 hp or larger, or more than 250 V; and (C) 500 V for a circuit rated 30 V or less. If an inductively coupled winding is included in the circuit being tested, the

winding not in the test circuit shall be grounded. This test shall be made following each of the temperature tests

specified in Clauses 6.4 to 6.7.

6.10.2 If higher than rated potential is developed in the motor circuit through the use of capacitors, the rated voltage of the system is to be used in determining the potential to be used in the test in Clause 6.10.1(b), unless the measured steady—state potential (see Clause 6.3.5) exceeds 500 V, in which case the test potential shall be 1000 V plus twice the developed voltage.

6.11 Temperature (Abnormal Operation)

6.11.1 Condenser Fan Failure Equipment with an air—cooled condensing unit shall be fitted with pressure gauges on both the high and low side of the refrigeration system close to the compressor. When two or more condenser fan motors are used, the test shall be conducted with one motor locked. The unit shall be operated with the fan motor locked until maximum stabilized temperatures and high side pressures are reached or until representative maximum temperatures and pressures are attained under cycling conditions. If the equipment cycles on a compressor motor overload device, fan motor overload device, or automatic—reset type pressure control, the test shall continue until maximum high side pressures are obtained.

6.11.2 Condenser Water Failure Equipment with a water—cooled condensing unit shall be fitted with pressure gauges as indicated in Clause 6.11.1 and shall be operated with the condensing water shut off, and also with the condensing water restricted until the maximum stabilized temperatures are reached, or until representative maximum temperatures are attained under cycling conditions. If the equipment cycles on a motor overload device or automatic—reset type pressure control, the test shall continue until maximum high side pressures are obtained.

6.11.3 For equipment incorporating a manual—reset type pressure control that operates during the tests of Clauses 6.11.1 or 6.11.2, the test shall continue until maximum temperatures are attained for up to five resets of the control. The control shall be reset as soon as possible after it operates.

6.11.4 The equipment shall not exhibit hazardous pressures or temperatures or leak refrigerant during the tests described in Clauses 6.11.1

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and 6.11.2.

6.11.5 The equipment is considered to comply with Clause 6.11.4 if (a) the refrigerant system does not rupture or develop leaks during the test. The maximum pressure recorded shall be used to determine the strength of all parts in the equipment in accordance 'with Clause 4.8.1.2; (b) the maximum temperature of the compressor motor enclosure does not exceed 150°C (364°F); (C) the winding temperature of the fan motor having an inherent overheating protective device does not exceed the value permitted by CSA Standard C22.2 No. 77; and (d) the maximum temperature of the fan motor enclosure does not exceed 150°C (364°F).

6.11.6 Other Components Equipment shall comply with Clause 6.11.7 when operated under any abnormal load conditions liable to occur in service, such as (a) failure of a single component that may result in an intermittent duty relay or solenoid being energized continuously; (b) an electrically operated valve or solenoid becoming mechanically blocked in the deenergized position; (c) operation of an electric heater in air with the regulating thermostat adjusted to its maximum setting; (d) operation of an electric storage tank heater with the water tank dry and the thermostat adjusted to its maximum setting; and (e) operation of an electric forced—air heater (such as an evaporator fan motor and defrost heater), if the fan motor operates during heater operation. The fan motor shall be locked and the thermostat or other control device shall be set at the highest temperature condition. If more than one fan motor is used, the test shall be conducted by locking the fan motor causing the most severe condition (such as the motor farthest from the control device).

6.11.7 Emission of any flame or molten material from the equipment during these tests shall constitute failure. Opening of the supply circuit protection is not considered to be a failure if a fire hazard does not exist.

6.12 Control Equipment

6.12.1 Overload

6.12.1.1 To comply with Clause 4.29.1, motor control devices, except as specified in Clause 6.12.1.2, shall be capable of making and breaking the motor locked—rotor current 50 times without undue burning, pitting, or welding of the contacts and without either electrical or mechanical failure. If the contacts control another circuit in addition to the motor, that circuit or an equivalent load shall be included in the total test current.

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6. 12. 1.2 Any control device, such as a magnetic contactor, starter, or

relay, that directly controls a motor and that can cycle automatically under locked—rotor conditions, shall be capable of

making and breaking the motor locked—rotor current 6000 times without undue burning, pitting, or welding of the contacts and without either electrical or mechanical failure.

6. 12. 1.3 In performing the overload test, the duration of the OFF period shall be such that the temperature rise of the windings does not exceed that normally encountered in service, but in no case shall the control be operated at a rate faster than 10 times per mm.

6. 12. 1. 4 For the overload test, the pole of the control least likely to arc to metal parts that may be grounded shall be connected to such parts. Under this condition flashover to these parts shall not occur. The connection of the switch pole shall be as follows:

(a) For single—pole controls connected to single—phase circuits, the supply line opposite to that passing through the control shall be connected to grounded metal parts; (b) For double—pole controls connected to single—phase circuits, the connection shall be as specified in Clause 6.12.1.4. If it is

difficult to ascertain visually which pole is least likely to arc to grounded metal parts, 25 operations per pole shall be made, the opposite pole in each instance being connected to grounded metal parts; (C) For double—pole controls connected to three—phase circuits, the phase not passing through the control shall be connected to

grounded metal parts; and (d) For three—pole controls connected to three—phase circuits, the centre pole shall be connected to grounded metal parts. Note: In these tests, "grounded metal parts" refers to those parts that are normally grounded in service. During the overload tests, such parts are isolated from ground.

6.12.2 Endurance

6. 12. 2 .1 When required by Clause 4.29.1, control devices shall be tested to the endurance requirements specified in Clauses 6.12.2.2 to 6.12.2.7. The device to be controlled shall be connected to a supply of rated voltage and rated frequency and the control shall be made to open and close the supply circuit at a rate of not less than 6 cycles per mm. The control shall operate throughout the test without mechanical or electrical failure and shall be in good operating condition at the end of the test. Except as stated below, all controls shall be subjected to 6000 cycles of operation.

6. 12. 2.2 Except as stated in Clauses 6.12.2.3 to 6.12.2.7, all controls shall be subjected to 6000 cycles of operation.



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6. 12. 2.3 An operating control that controls a compressor unit and that cycles automatically under normal operating conditions shall be subjected to 30 000 cycles of operation.

6.12.2.4 An automatic—reset type control that operates in each defrost cycle shall be subjected to 100 000 cycles of operation under load if a hazard could result due to short—circuiting of the control.

6.12.2.5 An automatic—reset type limit control that opens only in response to abnormal temperature shall be subjected to 6000 cycles of operation under load if a hazard could result due to short— circuiting of the control.

6. 12. 2. 6 A manual—reset type limit control that opens in response to abnormal temperature shall be subjected to 1000 cycles of operation under load and 5000 cycles without load if a hazard could result due to short—circuiting of the control.

6. 12. 2.7 A temperature regulating control for a water heater shall be subjected to 100 000 cycles of operation.

6.13 starting

6.13.1 Cord—connected equipment shall start, operate, defrost, and restart after defrost without opening a standard supply circuit fuse of a rating corresponding to that of the supply cord attachment—plug.

6.13.2 To determine compliance with the requirements of Clause 6.13.1, the equipment shall be connected in series with a line fuse rated as specified in Clause 6.13.1. The equipment shall then be operated under the load conditions specified in Clause 6.2. If the fuse opens during this test, the test shall be repeated using a time delay fuse. If the time delay fuse opens, (a) the equipment cannot be cord—connected and must be permanently connected; or (b) the supply cord and attachment—plug shall be replaced with one of higher rating and the test of Clause 6.13.2 repeated at the higher fuse rating.

In either case, the fuse rating must be considered with respect to requirements for conductor size, Clause 4.23.9.

6.13.3 If a time delay fuse is required for the equipment to comply with the test in Clause 6.13.2, the equipment shall be marked as specified in Clause 5.4.2.



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6.14 Flexing

6.14.1 Wiring that is subjected to bending or twisting during the normal use of the equipment (see Clause 4.23.8.2) shall be subjected to the flexing test specified in Clauses 6.14.2 to 6.14.6.

6.14.2 The application of the required number of cycles shall not result in any strands of a conductor piercing the insulation, any undue deterioration or damage to the insulation, or failure of the wiring to withstand the dielectric strength test specified in Clause 6.10.

6.14.3 For wiring between a cabinet and door, the normal cycle shall be considered to be one that is caused by a door opening as follows: (a) For vertical doors, an angle of 900; and (b) For horizontal doors, the maximum angle permitted by the design, or 90°, whichever is less.

6.14.4 For wiring between a cabinet and door, an abnormal cycle shall be one that results from a door opening through the maximum angle permitted by the design of the equipment.

6.14.5 The number of normal cycles shall be 150 000 and the number of abnormal cycles shall be 1000.

6.14.6 In making the test, a representative sample of the wiring shall be used, the arrangements for applying the stress cycles shall duplicate a typical installation, and the rate of cycling shall be any convenient rate. The wiring shall be energized with the normal operating load.

6.15 Cabinet Strength

6.15.1 Equipment shall withstand the static load test of Clause 6.15.4 and the deflection test of Clause 6.15.5. The static load test may be waived for units on which the test cannot be performed (such as on small units without a sufficiently large horizontal cabinet surface), or where it can be determined by visual examination that the unit would comply with Clause 6.15.2.

6.15.2 To comply with Clause 6.15.1, equipment shall withstand the tests described in Clauses 6.15.4 and 6.15.5 without (a) damage to the refrigeration system as evidenced by release of refrigerant; (b) reduction of electrical spacings below those specified in Clause 4.35; Cc) creating a shock hazard as judged by the requirements of Clause 4.4; (d) creating a mechanical hazard as judged by the requirements of



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Clause 4.6; (e) reducing the insulating properties of internal wiring as judged by the dielectric strength test of Clause 6.10; and (f) any transient distortion that causes a conductive enclosure to contact uninsulated live parts.

6.15.3 In addition to the requirements of Clause 6.15.2, wall—hung equipment shall withstand the test described in Clause 6.15.4 without (a) collapse of the mounting means; or (b) severance of its securement to the mounting means when fastened to a wall.

6.15.4 Static I,oad A load of 68 kg (150 ib) shall be simultaneously applied for a period of 5 mm to each of two flat metal plates. The area of. the plates shall be approximately 255 x 100 x 6.3 mm (10 x 4 x 1/4 in). The plates shall be positioned with the major axis of each parallel to that of the other and to the sides of the cabinet as shown in Figure 4, except that if the width of the equipment is less than 508 mm (20 in), the 203 mm (8 in) dimension shown in Figure 4 shall be disregarded and the plates shall be located so that their outside edges are flush with the sides of the cabinet.

6.15.5 Deflection Test A 12.7 rmn (0.5 in) diameter hemispherical surface shall be applied with a force of 225 N (50 lbf) for 1 mm on any external cabinet surface, including louvres, screens, or grilles.

6.16 Physical Abuse (Enclosures)

6.16.1 If an enclosure is used to isolate uninsulated live parts, it shall withstand an impact of 7 J (5.2 ft'lbf) without denting, breaking, or cracking in a manner that would (1) reduce electrical spacings below those specified in Clause 4.35 or (2) expose uninsulated live parts as judged by the requirements of Clause 4.4.7 except that, if the enclosure is protected because of its location within the confines of the equipment, it shall withstand an impact of 2 J (1.5 ft'lbf).

6.16.2 If an enclosure is used to provide protection against mechanical hazards in accordance with the requirements of Clause 4.6, it shall withstand an impact of 2 J (1.5 ftlbf) without suffering damage that would obviate compliance with the requirements of Clause 4.6.

6.16.3 A polymeric functional (structural) part protected because of its location within the confines of the refrigerator shall withstand an impact of 2 J (1.5 ft•lbf) without breaking or cracking in a manner that would (a) reduce electrical spacings below those specified in Clause 4.35; or (b) expose uninsulated live parts as judged by the requirements of

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Clause 4.4.7.

6.16.4 The impacts shall be produced by a 51 mm (2 in) diameter, 0.56 kg (1.25 lb) steel ball. Three complete as—received samples shall be used for this test except as otherwise specified in Clause 6.16.5. Each sample shall be mounted in its intended position and shall be subjected to a single impact directed at a different location. If the manufacturer so elects, fewer samples may be used if the sample can withstand repeated impacts.

6.16.5 If a polymeric enclosure or part is used within a freezer compartment, the impact test of Clause 6.16.4 shall be conducted immediately after the test samples have been conditioned for a period of 3 h to an ambient temperature of —17.8 1.5°C (0 2.7°F). 6.17 Physical Abuse (Glass Assemblies)

6.17.1 As required by Clause 4.2.4, glass door and glass panel assemblies shall be tested as in Clause 6.17.2.

6.17.2 One glass door or panel assembly shall be supported in a manner representative of its intended use. An impact of 8 J (5.9 ft'lbf) shall be applied at the approximate centre of both the inside and outside surfaces. After this test, the glass panels shall not (a) reduce electrical spacings below those specified in Clause 4.35; or (b) expose uninsulated live parts as judged by the requirements of Clause 4.4.7.

6.17.3 The impacts shall be produced by a 51 mm (2 in) diameter, 0.56 kg (1.25 lb) steel ball.

6.18 Rain Test

6.18.1 The rain test apparatus shall consist of three spray heads mounted in a water supply rack as shown in Figure 5. The spray heads are to be constructed in accordance with Figure 6. The distance between the centre nozzle and the product shall be approximately 0.9 m (3 ft). The product shall be brought into the focal area of the three spray heads in such position, and under such conditions, that the greatest quantity of water will enter the product.

6.18.2 The spray shall be directed at an angle of 45° to the vertical, towards the louvres or other openings closest to live parts. Water pressure shall be maintained at 34.5 kPa (5 psig) at each spray head.

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6.18.3 The equipment shall be operated so that electrical components are energized, and the product shall be tested under the intended conditions of use judged most likely to cause the entrance of water into or onto electrical components. It may be necessary to operate the unit under various modes. of operation, or to deenergize the product, if more adverse conditions could result. In any case, each exposure shall be for 1 h, and if more than one exposure is required, the product shall be prepared for test as indicated in Clause 6.18.6 before repeating the test.

6.18.4 Openings intended for field conduit connection shall be provided with such connections, with outer end sealed, but with pipe thread compound at the connection. Openings intended for the entry of conductor for Class 2 wiring shall not be sealed.

6.18.5 Except as indicated in Clause 6.18.6, the unit shall be examined to determine that all electrical parts, including motor windings, are not wetted and that there is no accumulation of water within the enclosures of electrical parts prior to rain exposure.

6.18.6 Drying of the unit prior to the second or subsequent exposure is not required if, without such preparation, the unit complies with the requirement in Clause 6.18.7.

6.18.7 After each exposure the unit shall have an insulation resistance between live parts and dead—metal parts no less than 50 000 2. The insulation resistance shall be measured 1 rain after application of the test voltage, obtained by using the series voltmeter method, or other equivalent means, in a direct—current circuit.

6.18.8 After measurement of the insulation resistance, following the final exposure to the rain, the complete product shall be subjected to the dielectric strength test of Clause 6.10.

6.18.9 Water shall not enter enclosures above the lowest electrical component other than insulated wire in wetting of live parts except that (a) water may enter an enclosure above the lowest electrical component if the point of entrance is not in proximity to live parts, and if live parts are not wetted; and. (b) a motor winding may be wetted if the motor is located within the cabinet, and is shielded from openings in the top of the cabinet. However, the motor shall meet the minimum insulation resistance requirement of Clause 6.18.7 and the unit shall withstand the dielectric strength test of Clause 6.10.



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6.19 Elastomeric Materials Deterioration Test for Gaskets and Adhesives

6.19.1 For equipment that requires a gasket to comply with the rain test, Clause 6.18, the gasket material shall comply with Clauses 6.19.2 to 6.19.5.

6.19.2 Gasket materials shall show no apparent deterioration and shall not show a change in hardness of more than five gauge numbers (0.005 in) following the test of Clause 6.19.3.

6.19.3 The hardness of the ungauged material shall be determined as the average of five readings with a suitable gauge (such as the REX Hardness Gauge or the Shore Durometer). The component shall then be exposed to oygen at a pressure of 2070 70 kPa (300 10 lb/in'), and a temperature of 70 1°C (158 1.8°F), for 96 h, in accordance with the method described in ANSI/tJL Standard 44. The component shall remain at room temperature for not less than 4 h after being removed from the oxygen bomb. The hardness shall then be determined again as the average of five readings. The difference between the original hardness reading and the reading taken after exposure to oxygen shall be the change in hardness.

6.19.4 For a gasket secured by an adhesive, samples of the gasket, adhesive, and mounting surface shall be exposed to the following conditions for 72 h each: (a) exposure to air at 100°C (212°F); (b) immersion in distilled water; and Cc) exposure to air at —10°C (14°F).

6.19.5 To comply with Clause 6.19.4, the force required to peel the gasket from its mounting surface after exposure shall not be less than 50% of the value determined on as—received samples, nor less than 9 N/25 mm (2 lbf/in) width of gasket.

6.20 Moisture Absorption Resistance

6.20.1

Insulating material, required by Clause 4.24 to be moisture absorption resistant, shall comply with the test of Clause 6.20.2 or 6.20.3.

6.20.2 The insulating material shall not absorb more than 10% of water by mass when immersed for 24 h in water at 23 1°C (73.4 1.8°F). A sample of the material shall be conditioned at 105 5°C (253 9°F) for 1 h before weighing and immersing.

6.20.3 As an alternative to the test of Clause 6.20.2, cord—connected



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equipment shall be conditioned for 48 h in a test chamber that is maintained at a temperature of 32 2°C (89.6 3.6°F) and at a relative humidity of 88 2%. The equipment shall be at a temperature just above the

conditioning temperature when it is placed in the test chamber. Immediately after conditioning, the appliance shall be tested for

compliance with the leakage current test requirements of Clause 6.9.

6.21 Printed Circuit Boards (Abnormal)

6.21.1 To determine whether a circuit complies with the requirements in Clause 4.35.3.2(b), components shall be short— or open—circuited one at a time. There shall be no ignition of cotton* placed around other components that are likely to overheat as a result of the open— or short—circuited component. *Type 1, Class 2 surgical cotton as specified in CGSB Standard 67-GP- 7M.

6.21.2 During the test described in Clause 6.21.1, the equipment shall be connected to a supply that is protected by a branch. circuit fuse of a rating as required by the equipment, but in any event not less than 15 A.

6.21.3 The enclosure and exposed non—current—carrying metal parts shall be connected through a 1 A non-time—delay fuse to the pole of the supply circuit least likely to strike to ground. Opening of the fuse during the test is not acceptable.

6.21.4 The test shall be discontinued when any one of the following conditions occurs: (a) the cotton ignites or chars; (b) the circuit under test opens; (C) a protective device operates; or (d) no further change is likely to occur for each condition of open— or short—circuiting.

6.21.5 Opening of the branch circuit fuse, any circuit component, or an internal protective device is an acceptable termination of the test.

6.22 Door Latch Release

6.22.1 As required by Clause 4.6.5, a door latch release device shall comply with the test specified in Clause 6.22.2. This test shall be made with any nonautomatic locks in the unlocked position.

6.22.2 Art interior latch release device shall permit the door to open with a force of 67 N (15 lbf) or less applied at the rate of 13—18 N/s



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(3—4 lbf/s). Where applicable, this. test shall be conducted before and after the conditioning specified in Clause 6.22.5.

6.22.3 If the test in Clause 6.22.2 is applied to a door with an adjustable spring closing or counter—balancing mechanism, the mechanism shall be adjusted to the position requiring maximum opening force permitted by the design.

6.22.4 The release force measurements shall be made by means of a force gauge at three points on the inside accessible door or door liner edge on the side opposite the hinges. One point shall be near the top of the door, one point near the bottom of the door, and one point midway between these two points. The test shall be conducted with the equipment, in its entirety, in any convenient ambient temperature. The force measurements may be made at points on the outer door surface corresponding to the three internal points, except that if a force on an interior bar, lever, or similar actuator is required to release the door latch, the force shall be applied to this actuator.

6.22.5 Components of a latch release mechanism that permit a door to open as a result of pushing an actuator shall not break, crack, or permanently deform from the application of 50 successive pushing operations followed by 50 successive pulling operations (if either or both are applicable, depending on the component construction). The test force shall be applied by dropping a mass of 9.1 kg (20 ib) from a height of 150 mm (6 in).

6.23 Overflow

6.23.1 As required by Clauses 4.4.4 and 4.4.5, equipment shall be positioned as intended in use and investigated for the following conditions: (a) overflow of a pan, trough, or the like; (b) overflow of a blocked drain with an inlet valve or automatic water shut-off being blocked open; and (c) overflow caused by leakage from a water line connection.

6.23.2 Compliance with Clause 4.4.4 shall be determined by visual examination except that, where visual examination is not practical, the equipment shall, following each overflow test, comply with the dielectric strength test of Clause 6.10 and with the leakage current test of Clause 6.9, except the leakage current shall not exceed 5 mA.

6.24 Strain Relief (Supply Cord) The strain relief means provided for a supply cord as required by Clause 4.19.1 shall withstand for 1 mm, without displacement, a direct pull of 155 N (35 lb force). The strain relief means shall not allow any movement of the cord that would result in strain on the terminals, splices, or interior wiring.



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6.25 Pressure Test for Water Heater Tanks

6.25.1 Test Requirements

6. 25.1.1 This test shall be applied to all water heater tanks as required by Clause 4.12 except those .that bear provincial registration markings in accordance with CSA Standard B51, or markings indicating compliance with the applicable ASME Boiler and Pressure Vessel Code.

6. 25. 1.2 The water tank shall withstand (a) a hydrostatic test pressure of 1970 kPa (300 psi), or its rated hydrostatic test pressure, whichever is greater, for a period of 30 miii without leakage or permanent deformation; or

(b) a hydrostatic test pressure of 3450 kPa (500 psi), or five times its rated working pressure, whichever is greater, for a

period of 1 mm without leakage or rupture.

6. 25.1.3 If testing is done according to Clause 6.25.1.2(a), an increase of more than 0.2% of any circumference or an increase in deflection of the top head plus the deflection of the bottom head of more than 0.5% of the diameter of the tank shall be considered as permanent deformation.

6. 25. 1.4 The maximum allowable working pressure shall be not more than 42.5% of the hydrostatic test pressure, if the test is done according to Clause 6.25.1.2(a), and not more than 20% of the hydrostatic test pressure, if the test is done according to Clause 6.25.1.2(b).

6.25.2 Test Procedure

6. 25. 2.1 Pressure relief valves shall be removed from the tank and all openings closed.

6. 25. 2.2 The tank shall be filled with water at atmospheric pressure; air pocketing shall be avoided.

6.25.2.3 If testing according to Clause 6.25.1.2(a), the following measurements shall be taken before applying the hydrostatic pressure. The circumference shall be measured along the complete length at intervals not to exceed 30.5 cm (12 in). The overall length from the crown of the bottom head to the crown of the top head shall be measured or an extensorneter shall be fitted with the movable spindle against the crown of the bottom and top heads, to determine the deflection of the heads.

6. 25. 2.4 The hydrostatic pressure shall be applied, without creating shock



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stresses, and maintained at the required test value for 30 mm.

6.25.2.5 The hydrostatic pressure shall be reduced to atmospheric pressure and the measurements required by Clause 6.25.2.3 repeated.

6.25.2.6 The deformation shall be determined from the measurements taken before application of the hydrostatic pressure.

6.26 Pressure Tests

6.26.1 Pressurized Product Systems

6.26.1.1 The test of Clause 6.26.1.4 shall be applied to all components in a pressurized product system, but not including any pressure gauge or relief valve.

6. 26. 1.2 The start—to—discharge pressure of the pressure relief valve shall be determined by the test of Clause 6.25.1.3.

6. 26 .1. 3 Three samples of the pressure relief valve shall be tested. Each sample shall be connected to a gas source, such as air, carbon dioxide, or nitrogen, and immersed in water. The pressure shall be increased gradually until the valve opens as evidenced by the occurrence of bubbles in the water. The highest value obtained shall be the start—to—discharge pressure.

6.26.1.4 A sample of the product system referred to in Clause 6.26.1.1 shall be subjected to a hydrostatic pressure of five times the start—to— discharge pressure specified in Clause 6.25.1.2 for a period of 1 mm. The system shall be considered to comply with the requirement if it does not burst or leak, except that leakage shall not be considered a failure if the leakage occurs at a pressure greater than 40% of the required maximum pressure. If such leakage does occur, it shall comply with the overflow test of Clause 6.23.

6.26.2 Refrigerant—Containing Components Pressure tests on refrigerant—containing components, rupture members, and fusible plugs shall be conducted in accordance with the requirements of CSA Standard C22.2 No. 140.3.

6.27 Limited Short Circuit (Inherent Motor Protective Devices)

6.27.1 Motor protective devices, as referenced in Clause 4.25.3.2 and conductors, as referenced in Clause 4.23.10.3, shall withstand short—circuit and ground fault conditions when protected by either a device that is suitable for branch circuit protection and located in the product or a branch circuit protective device of the type and rating specified in Clause 4.25.3.3. There shall be no damage to conductors or their terminations, no ignition of cheesecloth



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surrounding the enclosure housing the components under test, and no arc—over between low voltage and extra—low voltage circuits.

6.27.2 Each motor protective device and each conductor shall be connected in a circuit having a capacity based on the rated current and voltage of the product, as specified in Table 7. The product rated current shall be determined by adding the rated motor currents and the other rated currents. The circuit capacity shall be measured without the devices or conductors in the circuit.

6.27.3 Three samples of each component under test shall be subjected to each test condition. A new protective device shall be used for each test. Consideration shall be given to both short—circuit and ground fault conditions.

6.27.4 The rating of the overcurrent devices in the branch circuit required to supply the equipment shall be (a) for cord—connected equipment, the rating of the supply cord attachment—plug; and (b) for permanently connected equipment, one of the following:

(i) four times the full load amperes of the largest motor of the group plus the sum of any additional loads;

(ii) if the largest motor is a sealed type, 65% of the locked— rotor current plus the sum of any additional loads; or

(iii) the maximum overcurrent protection marked on the equipment, provided such protection is less than that specified in (i) and (ii) above.

6.28 Short—Circuit Test for Wiring

6.28.1 The test of Clause 6.28.3 shall be applied to conductors as required by Clause 4.23.10.1.

6.28.2 The conductors may be tested in position in the equipment.

6.28.3 To perform the test, the circuits containing the conductors shall be short—circuited at the point where they are connected to the components that they supply. The circuits shall be connected in series with the fuse specified in Clause 6.27.4 to a test circuit having a nominal voltage the same as the equipment. There shall be no evidence of a fire hazard.



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Table 1 Dimensions of Openings

(See Clause 4.6.4.)

Minor openi mm

dimension of ng,*

(in)

Minimum opening mm

distance to moving

from part, (in)

25 (1) 154 ( 6) 38 (1.5) 267 (10.5) 51 (2) 368 (14.5) 57t (2.25)

• 419 (16.5) 63.5t (2.5) 470 (18.5) 70t (2.75) 521 (20.5) 76i (3) 572 (22.5) Over 51 (2) 762 (30)

*For an opening having a minor dimension between two of the values in the Table, the distance from the opening to the guarded part shall not be less than that found by interpolation between values in the right-hand column of the Table. tThese values apply only to openings at the base of the equipment where the upper edge of the opening is less than 205 mm (8 in) above the floor.



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Table 2 Spacings

(See Clauses 4.28.2 and 4.35.1.)

Item Parts involved* Voltage range, V

Minimum spacing, mm (in)

At other than field wiring terminals

At field wiring terminals

Through Over air surface

Through Over air surface

1 Primary and secondary circuits in equipment rated at 2000 VA and less (a) Spacing A* 0—— 30

31——150 15l——300 30l——750

-

1.6 (0.062) 3.2 (0.125) 3.2 (0.125) 6.3 (0.25) 3.2 (0.125) 6.3 (0.25) 9.5 (0.375) 12.5 (0.5)

6.3) (0.25) 6.3) (0.25) 5.3) (0.25) 6.3) (0.25) 6.3) (0.25) 6.3) (0.25) 6.3) (0.25) 6.3) (0.25)

(b) Spacing B 0—--l50 l5l——300 301——750

6.3 (0.25) 6.3 (0.25) 6.3 (0.25) 6.3 (0.25) 9.5(3.75) 12.5 (0.5)

6.3 (0.25) 5.3 (0.25) 6.3 (0.25) 6.3 (0.25) 6.3 (0.25) 6.3 (0.25)

2 Primary and secondary circuits in equipment rated over 200 VA (a) Spacing A* 31——150

151——300 301——750

3.2 (0.125) 6.3* (0.25) 6.3 (0.25) 9.5 (0.25) 9.5 (0.375) 12.5 (0.5)

6.3) (0.25) 6.3) (2.5) 6.3 (0.25) 9.5 (0.375) 9.5 (3.75) 12.5 (0.5)

(b) Spacing B 31——750 12.5 (0.5) 12.5 (0.5) 12.5 (0.5) 12.5 (0.5)

*Spacing A applies between bare live parts of opposite.polarity and between bare live parts and non- current—carrying metal parts other than the enclosure. Spacing S applies between bare live parts and the walls of a metal enclosure including fittings for conduit or armoured cable. These spacings do not apply to an individual enclosure of a component part within an outer enclosure

or cabinet. *The spacings at an individual component part are to be judged on the basis of the total measured volt ampere consumption of the load or loads that the components control. For example, a component that controls only the compressor motor is judged on the basis of the measured volt amperes of the compressor motor. A component that controls loads in addition to the compressor motor is judged on the basis of the sum of the volt amperes of the loads so controlled, except that a component that independently controls separate loads is judged on the basis of the volt amperes of the larger load. The volt ampere values for the load referred to above are to be determined by the marked rating of

the load except that, for loads which are not required to have a marked rating, the measured input is to be used in determining the volt ampere values. §The spacings between field wiring terminals of different voltages or between a wiring terminal and ground shall be not less than 6.3 mm (0.25 in) except that if short—circuiting or grounding of such terminals will not result from projecting strands of wire, the spacing may be 3.2 mitt (0.125 in). Field wiring terminals are those connected in the field and not factory—wired. **The over—surface spacings for glass—insulated motor terminals may be 3.2 mm where 6.3 mm is specified in the table and may be 6.3 mm where 9.5 mm is specified in the table. For heater elements which are not subject to moisture, the spacings at the heater element terminals nay be as follows:

Voltage range Through air Over surface

0——300 1.6 mm (0.062 in) 1.6 mm (0.062 in) 300——600 6.3 mm (0.25 in) 6.3 mm (0.25 in)

Notes: (1) The spacings of motor terminals inside a hermetic motor enclosure may be one—half of those indicated in the table except that the over—surface spacings may be 2.4 mm where 6.3 mitt is specified in the table. (2) The above spacing requirements do not apply to the inherent spacings of a component part of equipment for which spacing requirements are given in other CSA Standards. However, the spacings resulting from the assembly of the components into the complete machine, including those to non- current—carrying metal parts of enclosures, shall not be less than those specified in the table. (3) The above spacing requirements do not apply to components connected in a circuit in which the current and voltage are limited in accordance with the requirements for a Class 2 circuit as defined by the Canadian Electrical Code, Part I. No spacing requirements are specified for these components. (4) The above spacing requirements do not apply at fixed parts of a rigidly clamped special factory— installed and —wired assembly of bare live parts and insulating spacers (such as contact arms) or to relay sockets or multi—pin connectors when used in circuits in which the voltage and power are limited to 150 V and 2000 Vk, respectively. At other than solder terminals, the spacing at such parts is to be not less than 1.6 torn (0.062 in) through air and over surface. The spacing at solder terminals is to be not less than 3.2 mm (0.25 in) through air and over surface.



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Table 3 Printed Circuit Board Spacings

(See Clause 4.35.3.1.)

Circuit rating Minimum spacing, mm ( in)

Volt amperes Volts Through air Over surface To cabinet

Components and printed circuits on the same base

0——150 151——250

251——600

1.2* 2.4*

9.5

(0.050) (0.100)

(0.375)

1.2* 2.4*

12.5

(0.050) (0.100)

(0.5)

1.2 (0.050) 2.4 (0.100)

12.5 (0.5)

• *These spacings are acceptable only if they are rigidly maintained. The acceptability of such spacings at solder terminals shall be the subject of investigation.

Table 4 Corrosion Protection (See Clause 4.7.8.)

Lighter than No. 16

No. 16 MSG/GSG and MSG/GSG as heavier as specified specified

Type of cabinet and enclosure by Clause by Clause

Outer cabinets that protect motors, wiring, or enclosed current—carrying parts 4.7.8.1 4.7.8.2

Inside enclosures that protect current—carrying parts other than motors 4.7.8.1 4.7.8.2

Outer cabinets that are the sole enclosure of current—carrying parts 4.7.8.2 4.7.8.2



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Table

5

Maximum

Allowable

Temperature

Rises

(See

Clauses

6.'i.l,

6.14.3,

and

6.7.1.)

Item

Material

and

component

parts

Temperature

rise,

°C

1

On

motor

windings,

cores,

etc

See

CSA

Standard

C22.2

No.

100

2

Hermetic

compressor

motor

enclosure

150*

3

Relay,

solenoid,

and

other

coils

Class

A

insulation

Class

B

insulation

By

thermocouple

65

85

By

rise-of-resistance

method

85

105

4

Transformers

See

CSA

Standard

C22.2

No.

66

5

At

any

point

within

a

supply

terminal

box

or

60t

on

supply

conductors

6

Capacitors

Electrolytic

type

40

Other

types

Marked

rating

minus

ambient

temperature

7

Field

wiring

terminals

50

8

Fibre

used

as

electrical

insulation

or

65

cord

bushings

9

Phenolic

composition

used

as

electrical

125

insulation

or

as

parts

where

failure

will

result

in

a

hazardous

condition

10

Insulated

conductors

Temperature

rating

of'

conductor

Flexible

cord

and

wires

with

rubber,

thermoplastic,

or

neoprene

insulation

11

Any

surface

that

organic

material

may

contact

50

12

Fir

plywood

floor

directly

below

the

90*

refrigerator



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'Maximum

temperature

only--not

temperature

rise.

tTemperatures

not

exceeding

the

temperature

rating

of

the

supply

conductors

are

permitted

provided

the

equipment

is

marked

in

accordance

with

Clause

5.12.

Does

not

apply

to

a

capacitor

that

is

an

integral

part

of

an

approved

motor.

§See

also

Clause

4.6.6.



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Table 6 Overcurrent Protective Device Rating for

Control Circuit Conductors (See Clause 4.23.10.3.)

Tapped control circuit

onductor size, mm (AWG)

Maximum rating of overcurrent protective device, A

Conductors contained in control equipment enclosure

Conductors extending beyond control equipment enclosure

Copper Alulninum* Copper Alumifluifl*

0.82 (18) 1.3 (16) 2.1 (14) 3.3 (12) 5.3 (10)

>5.3 (10)

25 —— 40 ——

100 —— 120 100 160 140 1 t

5 ——

10 ——

45 ——

60 45 90 75 4

*Includes copper-clad aluminum. t4OO of value specified for 60°C conductors in the Canadian Electrical Code, Part I. #3QQ of value specified for 60°C conductors in the Canadian Electrical Code, Part I.

Table 7 Limited Short—Circuit Test Currents (See Clauses 6.27.2 and 6.28.2.)

Product Ratings, A

Single—phase Circuit capacity, A llO——120 V 200——208 V 220——240 V 254——277 V

9.8 or less 5.4 or less 4.9 or less —— 200 9.9——16.0 5.5——8.8 5.0——8.0 6.65 or less 1000 16.1——34.0 8.9——18.6 8.l——17.0 —— 2000 34.l——80.0 18.7——44.0 17.l—--40.0 —— 3500 Over 80.0 Over 44.0 Over 40.0 Over 6.65 5000

Three—phase Circuit capacity, A 200——208 V 220——240 V 440——480 V 550——600 V

2.12 or less 2.0 or less —— —— 200 2.l3——3.7 2.1——3.5 1.8 or less 1.4 or less 1000 3.8——9.5 3.6——9.0 —— —— 2000 9.6——23.3 9.l——22.0 —— —— 3500

Over 23.3 Over 22.0 Over 1.8 Over 1.4 5000

CN/CSA—C22.2 N. 2O-91 — September 1991 — Page 86 Copyright Canadian Standards Association Reproduced by IHS under license with CSA


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A

Legend A——Region to be shielded by baffle shall be the entire component if it is not otherwise shielded, and shall be the unshielded portion of a component that is partially shielded by the component enclosure or equivalent. B——Projection of outline of component on horizontal plane. C——Inclined line that traces out minimum area of baffle. When moving, the line is always (1) tangent to the component, (2) 50 from the vertical, and (3) so oriented that the area traced out on a horizontal plane is maximum. D——Location (horizontal) and minimum area for baffle is that included inside the line of the intersection traced out by the inclined line C and the horizontal plane of the baffle.

Figure 1 Baffle Area

(See Clause 4.3.2.3(b).)

CAN/CSA—C22.2 No. 120—M91 — September 1991 — Page 87

50

N



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3.5 Approx 300

25 radius

25 radius

Note: All dimensions given are in millimetres.

Figure 2 Articulate Probe


4

CAN/CSA—C22.2 No. 120—M91 - September 1991 — Pane 88 Copyright Canadian Standards Association Reproduced by IHS under license with CSA


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Figure 3 Leakage Current Measurement Circuit


CAN/CSA—C22.2 No. l20-M91 — September 1991 — Page 89

Identified supply conductor





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Top surface of cabinet

__________ /

/ 68.1 kg

Plate load Plate

102mm

203 mm 203 mm Door (closed)

Figure 4 Static Load Test Arrangement

(See Clause 6.15.4.)

CAN/CSA—C22.2 No. 120-M91 — Septer.ber 199 - Page 90 Copyright Canadian Standards Association Reproduced by IHS under license with CSA


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Plan view

'' B Control valve for each spray head

Side view Focal point

Piezometer assembly 1/2" brass pipe ANSI/ASTM 843—80

.— D—---4-E

Item Inch mm

A 28 710 B 55 1400 C 2-1/4 55 D 9 230 E 3 75

Figure 5

Rain Test Spray—Head Piping (See Clause 6.18.1.)

CAN/CSA-C22.2 No. 120-M91 - September 1991 — Page 9

C

Water pressure gauge for each spray head



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1/2 in tapered pipe thread—ANSI B2.1

R (drill to depth required for throat)

(hex or round bar stock)

Assembly

Body

T (drill thru) 450 C'sink — S (deep)

U (drillru/"

Insert N (max)

— 3HoIes— space 1200

J 3-square section slots — W wide x G deep-space 120°—

60° helix-leading edges tangent to radial holes

Item Inch mm Item Inch mm

A 1-7/32 31.0 B 7/16 11.0 C 9/16 14.0 D 0.578 14.68

0.580 14.73 E 1/64 0.40 F

* *

G 0.06 1.52 H (No. 9)b 5.0 J 23/32 18.3 K 5/32 3.97 L 1/4 6.35

M 3/32 2.38 N 1/32 0.80 P 0.575 14.61

0.576 14.63 0.453 11.51 0.454 11.53

R 1/4 6.35 S 1/32 0.80 T (No. 35)t 2.79 U (No. 40)t 2.49 V 5/8 16.0 W 0.06 1.52

*ANSI B94. 11 Drill Size tOptional — to serve as wrench grip

Figure 6 Rain Test Spray Head (See Clause 6.18.1.)

CAN/CSA-C22.2 No. 120—M91 — September 1991 - Page 92 Copyright Canadian Standards Association Reproduced by IHS under license with CSA


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Appendix A Minimum Design Pressures

Note: This Appendix is not a mandatory part of this Standard.

Minimuni* Design Pressures (See Clause 5.3(1).)

Minimum design pressures, h gauget

High side

Water- or

Low evaporator-

Refrigerant Name kPa side,

(psig) cooled, Air—cooled, kPa (psig) kPa (psig)

R-11 Trichiorofluoromethane R—12 Dichlorodjfluoromethane

103 15 103 15 145 21

R-13 Chiorotrifluoromethane 579 814 875 127 1165 169

R—1381 Bromotrifluoromethane 3591 521 3770 5147 3770 5147

R_114 Tetrafluoromethane 230 2213 321 2826 410

R—21 DichlorofluOromethane 3750 51414 3750 5144

R—22 Chlorodjf'luoromethane 103 15

1144

200 29 317 46

R—30 Methylene chloride 14524 211 1916 278

R-40 Methyl chloride 103 2496

15 103 15 103 15

R—113 Trichlorotrjfluoroethane 72 772 112 1041 151

R—114 Dichiorotetrafluoroethane 103 1214

15 103 15 103 15

R—115 Chioropentafluoroethane 1048 18 241 35 365 53

R—170 Ethane 142146

152 1337 1914 1737 252

R—290 Propane

616 4887 709 4887 709

R—C318 Octafluorocyclobutane 234 129 1296 188 1682 244

R—500 Dichlorodjfluoromethane 73 .8% and Ethylidene fluoride, 26.2% 703

34

102

1407 59 586 85

R—502 Chiorodifluoromethane, 48.8% and

Chioropentafluoroethane, 51.2% 1110 161

1055 153 1399 203

R-503

R—600

Trifluoromethane, 140.1% and

Chlorotrifluorornethane, 59.9% N—Butane

14253 617

1599 232 2075 301

4253 617 4253 617

R—600(a) Isobutarie 159 23 290 42 420 61

R—611 Methyl formate 39 24314 63 607 88

R—717 Ammonia 15 103 15 103 15

R—7)414 Carbon dioxide 951 6583

138

955 1475 2114 2020 293

R—76)4 Sulphur dioxide 7293 1058 7293 1058

R—1150 Ethylene 5046 732 538 78 793 115

50146 732 50146 732

*Selectjon of higher design pressures may be required to satisfy actual shipping, operating, or standby conditions. iSaturated pressures corresponding to a low side temperature of 26.7°C (80°F), a water- or evaporator-cooled temperature of 40.6°C (105°F) and an air-cooled temperature of 51.7°C (12°F).



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Appendix B Manufacturing and Production Tests


Bi. Production Line Dielectric Strength Test (a) The equipment, upon completion of manufacture and before shipment, shall withstand the dielectric strength test of Clause 6.10. As an alternative, a potential 20% higher may be applied for 1 S.

(b) If a unit employs components such as a solid—state control that can be damaged by the dielectric potential, the test may be conducted before such components are electrically connected. However, a sample selected at random from production each day is to be tested to verify compliance with Clause 6.10. The circuitry may be rearranged for the test on the randomly selected sample to reduce the possibility of component damage while retaining representative dielectric stress of the circuit.

B2. Pressure Test for Refrigerant Leakage At the completion of manufacture and before shipment, the complete refrigeration system of the equipment shall be tested and proved tight at pressures not less than the highest of the following: (a) The test pressures or design pressures marked on the data plate for the equipment; (b) The minimum design pressures as shown in Appendix A. Alternatively, the leakage test on the complete system may be

conducted at the marked low side test pressure if (a) the final assembly of the equipment is completed with flare type fittings or telescoped tubing joints that are sealed with silver solder, brazing, or equivalent means; and (b) the high side parts are either CSA certified refrigerant— containing component parts or have been individually tested at not less than the marked high side test pressure, unless the high side parts are fabricated from continuous tubing having a wall thickness not less than that shown in the table for "Tubing Wall Thickness" in CSA Standard C22.2 No. 140.3.

CAN/CSA—C22.2 No. 120—M91 — September 1991 — Paqe 94 Copyright Canadian Standards Association Reproduced by IHS under license with CSA


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Appendix C Determination of Minimum Circuit Ampacity (See Clause 5.5.1)


Cl. For a combination load (a load consisting of one or more motor/motor compressors, electric heaters, and any other loads), 125% of the Fr.1A/RE1A of the largest motor/motor compressor (whichever is greater), plus 100% of the heater load, plus the sum of all other loads.

C2. Determination of Maximum Overcurrent Protection The maximum current rating of overcurrent protection for units having one or more motor and other loads, operated from a single supply source, shall be determined as follows (all concurrent loads are to be considered in the determinations): (a) For non—time—delay fuse: 300% of the FLA* of the largest motor, or 50% of the RLAI of the largest motor compressor (whichever is greater), plus the FLA/RLA of all other loads; (b) For time delay fuse: 175% of the FLA of the largest motor, or 30% of the RLA of the largest motor compressor (whichever is greater), plus the FLA/RLA of all other loads; (C) For circuit breaker: 250% of the FLA of the largest motor, or 40% of the RLA of the largest motor compressor (whichever is greater), plus the FLA/RLA of all other loads. Notes: (1) If the calculated value does not permit the equipment to start, the calculated value may be 65 of the RLA of the motor compressor instead of 5O. (2) For equipment where the heating load exceeds the motor loads, the maximum overcurrent protection shall be calculated in accordance with Section 62 of the Canadian Electrical Code, Part I. *FL,A__Full Load Amperes tRLA---Rated Load Amperes



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Documents

CSA22-2-120_R2004