EBCS 10 Content

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EBCS-10:2013

Ethiopian Building Code Standard

_

ELECTRICAL INSTALLATION

OF BUILDINGS

2013 Edition


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FOREWORD

The Proclamation to define the powers and duties of the Central and Regional Executive Organs of the

Transitional Government of Ethiopia No. 41/1993 empowers the Ministry of Works and Urban Development to

prepare the Country's Building Code, issue Standards for design and construction works, and follow up and

supervise the implementation of same.

In exercise of these powers and in discharge of its responsibility, the Ministry is issuing a series of Building

Code Standardsof general application.

The purpose of these standards is to serve as nationally recognized documents, the application of which is

deemed to ensure compliance of buildings with the minimum requirements for design, construction and quality

of materials set down by the National Building Code.

The major benefits to be gained in applying these standards are the harmonization of professional practice and

the ensuring of appropriate levels of safety, health and economy with due consideration of the objective

conditions and needs of the country.

As these standards are technical documents which, by their very nature, require periodic updating, revised

editions will be issued by the Ministry from time to time as appropriate.

The Ministry welcomes comments and suggestions on all aspect of the Ethiopian Building Code Standards.

All feedback received will be carefully reviewed by professional experts in the field of building construction

with a view to possible incorporation of amendments in future editions.

Mekuria Haile

MinisterMinistry of Construction and

Urban Development

2013


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INTRODUCTION

This Code Standard for the Electrical Installation of Buildings, EBCS 10: 2013 Edition, is part of the Building

Code of Ethiopia which is a revision of the eaerlier EBCS 10: 1995 Edition.

EBCS 10 has been mainly adopted and adaptedfrom IEE Regulations for Electrical Installations (Bris=tish

origin), Canadian Electrical Code, Part 1; the German standard (DIN and VDE); and National Fire Protection

Authority/National Electrical Code (NFPA/NEC) of the USAto suit the Ethiopian conditions. Other

publications quoted are shown in the respective sections of the Code and the Ethiopian Standardization Agency

maintains registers of a number of foreign national and international standards.

The Code embraces several aspects of electrical installation work and sets standards and provisions for safe

utilization of electricity.

The Technical Committee for the first edition of the Code Standards for the Electrical Installation of Buildings

comprised of the then following Institutions representing balanced interest of all segments of the public

concerned with the subject matter:

Ministry of Works & Urban Development (MWUD),

now Ministry of Construction & Urban Development (MoCUD)

Building Design Enterprise (BDE)

Ethiopian Electric Light & Power Authority (EELP A),

now Ethiopian Electric Power Corporation (EEPCO)]

Addis Ababa University, Faculty of Technology (AAU),

now represented by Addis Ababa Institute of Technology (AAiT)

Ethiopian Authority for Standardization (EAS),

now Ethiopian Standards Agency

For the revision process to come up with EBCS-10: 2013 Edition, MoCUD signed a memorandum of

understanding with Addis Ababa University in 2012 which mandated also to involve members from other

stakeholders including the industry, private consultants, contractors andgovernment agencies. Accordingly, the

Building Electrical Installation Technical Committee (BEITC) has been formed from practical as well as

theoretically experienced members from Addis Ababa Institute of Technology (AAiT) of the AAU and a

private consultant.


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History and Development of the Ethiopian Building Electrical Installation Code

and Standard (now referred to as EBCS-10)

In the growing Ethiopian practice on building electrical installations, introduced, developed and established over

a period extending up to a century since the early 1900s, it appears that electrical installation practices (i.e. both

approved and taken for granted) were practically derived from European practices. Henceforth, the design rulesand contracting or subcontracting practices were implicitly based first on either on earlier versions of IEC 60

364 standards, or later on and more recently on DIN VDE 0 100 standards and regulations.

The first nationally governing regulatory document concerning building electrical installation in Ethiopia has

been issued by the then Ethiopian Electric Light and Power Authority(EELPA) under the theme Building

Electrical Installation Regulation ???? in 196??. During that time EELPA had been acting not only as a utility

engaged in the generation, transmission, distribution and sales of electric power but also as a regulator of the

same as well as building electrical installations. This first regulatory document, produced by EEPCO, has been

very limited in scope, coverage and application. This problem initiated the process and paved the way for

producing an entirely new and wide code.

By far the more wide issues covering, systematized, and standardized document comparable to international

similar experiences is the Building Electrical Installation Standard and Code of Ethiopia, referred to as EBCS-10

and developed in 1995.

EBCS-10 is an integral part of the Ethiopian Building Code Standard which comprises 11 codes that address the

structural, foundational, earthquake etc aspects of a building. EBCS 10 is concerned about only issues of

electrical installation in a building. The main purpose of EBCS 10 has been for the safe utilization of electricity

in buildings plus embracing several aspects of electrical installation work.

Some time in between, the then EELPA has been transformed in to Ethiopian Electric Power Corporation whose

activity has been limited to only operational and not regulatory. The regulatory aspect has been entitled to

various government agencies through proclamations.

As to application, because no formal enforcement mechanisms have been in place, only very few professionals

practiced the EBCS-10:1995 Building Electrical Installation Code and Standard while most adhering to

international codes and standards. As a result, it has been difficult to do impact analysis of the effect of EBCS-

10:1995 in the Ethiopian building installation practice.

The Ministry of Construction and Urban Development (MoCUD), observing the safety and reliability problemsin many buildings associated to electrical installations, initiated the EBCS10:1995 to be revised in 2011 after its

16 years of service. Accordingly EBCS-10: 2013 Edition, a revised version of EBCS10:1995, has been

produced.


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Preface to EBCS-10: 2013 Edition

EBCS-10: 2013 Edition is the updated version of EBCS-10: 1995. In the update process the Building Electrical

Installation Technical Committee (BEITC) focused mainly on the following aspects of revision:

Emphasizing/redefining the purpose/mandate of the EBCS-10 code

Using/citing updated and latest versions of the Normative Reference materials that has already been

utilized and reflecting the updated information therein in EBCS-10.

Incorporation of missing issues requiring codes and standards within the existing 26 sections of the code

Introducing additional separate Sections in to the existing code to address some important issues

Correction of typographical errors in the previous document of the code

The main purpose of EBCS 10 has been maintained to be primarily for safe utilization of electricity in buildings

ensuring the avoidance of fire hazards on humans/animals, buildings and properties therein and thereby as wellas shock hazards on humans and animals. Critical issues such as reliability, efficiency, economics as well as the

convenience, expansion and maintenance of a building electrical installations have been raised and discussed

among the Tehnical Committee.However, centering on the issue of safety makes logically the conductors,

devices, apparatuses and other electrical materials to be used to be of relatively higher capacity, higher quality

and durable and as a result reliability and efficiency aspects of the installation will be satisfied. However, cost of

the installation would increase which should be compromised for the prior agenda of safety of humans and

properties. Thus, in the selection and endorsement of the prior Normative References, cost has not been

considered.

EBCS-10: 1995 and EBCS-10:2013 both are adoptions of codes and standards from Europe, USA and Canada

plus some adaptations to local context. This process has been maintained and updated versions of the Normative

References have been referred.


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NOTICE AND DISCLAIMER OF LIABILITY CONCERNING THE USE OF EBCS-10: 2013

DOCUMENTS

The codes, standards, recommended practices, and guides contained in EBCS-10: 2013areadopted andadaptedfrom known codes such as that of the European (EN) and/or British (BS), the Canadian and theAmericans NEC.

Accordingly the Building Electrical Installation Technical Committee(BEITC) did not independently test,evaluate, or verify the accuracy of any information or the soundness of any judgments contained in its codes andstandards.

BEITCdisclaims liability for any personal injury, property or other damages of any nature whatsoever, whetherspecial, indirect, consequential or compensatory, directly or indirectly resulting from the publication, use of, orreliance on this document.

BEITCalso makes no guaranty or warranty as to the accuracy or completeness of any information publishedherein.

Anyone using this document should rely on his or her own independent judgment or, as appropriate,

seek the advice of a competent professional in determining the exercise of reasonable care in any givencircumstances.

BEITChas no power, nor does it undertake, to police or enforce compliance with the contents of this document.

Nor doesBEITClist, certify, test or inspect products, designs, or installations for compliance with thisdocument.

Any certification or other statement of compliance with the requirements of this document shall not beattributable toBEITCand is solely the responsibility of the certifier or maker of the statement.

ADDITIONAL NOTICES AND DISCLAIMERS

Updating of the EBCS 10 Document

Users of EBCS 10:2013 should be aware that the document may be superseded at any time by the issuance ofnew editions or may be amended from time to time through the issuance of amendments. An official EBCS10:13 document at any point in time consists of the current edition of the document together with any tentativeamendments and any Errata then in effect..Interpretations of the EBCS 10:2013 Document

..

Patents

EBCS 10:2013 does not take any position with respect to the validity of any patent rights asserted in connectionwith any items which are mentioned in or are the subject of codes, standards, recommended practices, andguides in EBCS 10:2013 and the EBCS 10:2013 disclaims liability for the infringement of any patent resultingfrom the use of or reliance on these documents.

Users of this document are expressly advised that determination of the validity of any such patent rights, and therisk of infringement of such rights, is entirely their own responsibility.


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EBCS 10:2013adheres to applicable policies of the Ethiopian Standards Agency or the Intellectual Property andCopyright Protection Authority??? of Ethiopia.

Law and Regulations

Users of this document should consult applicable federal, state, and local laws and regulations. EBCS 10 does

not, by the publication of its codes, standards, recommended practices, and guides, intend to urge action that isnot in compliance with applicable laws, and these documents may not be construed as doing so.

Copyrights

This document is copyrighted by the EBCS. It shall be made available for a wide variety of both public andprivate uses. These include both use, by reference, in laws and regulations, and use in private self-regulation,standardization, and the promotion of safe practices and methods.

By making this document available for use and adoption by public authorities and private users, the MoCUDdoes not waive any rights in copyright to this document.

Use of EBCS10 document for regulatory purposes should be accomplished through adoption by reference. Theterm adoption by reference means the citing of title, edition, and publishing information only. Any deletions,additions, and changes desired by the adopting authority should be noted separately in the adopting instrument.


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ETHIOPIAN BUILDING CODE STANDARD

EBCS-10: 2013 ELECTRICAL INSTALLATION OF

BUILDINGS S

TABLE OF CONTENTSFOREWORD .. i

INTRODUCTION .. ii

HISTORY AND DEVELOPMENT OF THE ETHIOPIAN BUILDING ELECTRICAL INSTALLATION CODE AND STANDARD . iii

PREFACE TO EBCS-10: 2013 EDITION: .. iv

NOTICE AND DISCLAIMER OF LIABILITY . v

SECTION 1 SCOPE AND DEFINITIONS

1.1 Scope . 1

1.2 Nonnative references 1

1.3 Definitions 2

SECTION 2 GENERAL REQUIREMENTS

2.1 Administrative 20

2.1.1 Authority for rules .20

2.1.2 Permit 202.1.3 Application for inspection .20

2.1.4 Posting of permit .20

2.1.5 Notification re-inspection 20

2.1.6 Plans and specifications 21

2.1.7 Connection authorization 21

2.1.8 Re-inspection .21

2.1.9 Renovation of existing installation 21

2.1.10 Use of approved equipment 22

2.1.11 Deviation or postponement 22

2.1.12 Powers of rejection .22

2.1.13 Installation of electrical equipment 22

2.1.14 Damage and interference 22

2.2 Technical ..23

2.2.1 Conventional symbols ..23


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2.2.2 Co-ordination ....23

2.2.3 Location and requirement of substation ..23

2.2.4 Rooms (spaces) required ..23

2.2.5 Location and requirements of distribution boards 24

2.2.6 Location and requirements of PBX/PABX rooms 24

2.3 Planning and designing 25

2.3.1 General 25

2.3.2 Layout and installation drawing 25

2.3.3 Design 25

2.4 Marking of equipment 26

2.4.1 General 26

2.4.2 Workmanship and materials 27

2.4.3 Material for anchoring 27

2.4.4 Protection of persons and property 27

2.4.5 Maintainability ... 27

2.4.6 Enclosures .. 28

SECTION 3 ILLUMINATION

3.1 Scope .293.2 Normative references 29

3.3 Definitions 30

3.4 Lighting requirements ..35

3.4.1 Illuminance . 35

3.4.2 Luminance ...35

3.4.3 Glare ... 36

3.4.4 Light direction and modelling .36

3.4.5 Colour rendering ..36

3.5 Emergency lighting requirements .37

3.5.1 Escape lighting ....37

3.5.2 Safety lighting for particular hazardous workplaces 37

3.5.3 Standby lighting .38


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3.6 Lighting requirements for various types of buildings 38

3.6.1 General .38

3.6.2 Industrial ..39

3.6.3 Offices . 39

3.6.4 Hotels and restaurants . 39

3.6.5 Educational establishments 40

3.6.6 Hospitals . 40

3.7 Outdoor lighting requirements ..42

3.7.1 Illuminance ..42

3.7.2 Colour rendering group 42

3.7.3 Limitation of glare ...43

3.7.4 Lighting of outdoor fixed location work spaces 43

SECTION 4 CONDUCTORS

4.1 Scope .66

4.2 Nonnative references .66

4.3 Definitions .67

4.4 Size of conductors .69

4.4.1 Phase conductors in a.c. circuits and live conductors in d.c. circuits ... 69

4.4.2 Neutral conductors . 69

4.5 Ampacity of wires, cables and flexible cords 70

4.5.1 Conductor operating temperature 70

4.5.2 Cables connected in parallel 70

4.5.3 Cables connected to bare conductors or bus bars .70

4.5.4 Voltage drop .70

4.6 Flexible cords . 70

4.7 Colour of conductors ..714.8 Maximum permissible temperature 71

Annex (preface)

Annex A (Normative) - Correction factors...74

Annex B (Normative) - Type of cable and ampacity 85


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SECTION 5 SERVICE AND SERVICE EQUIPMENT

.90

5.1 Scope . 141

5.2 Normative references .141

5.3 Definitions .141

5.4 General requirements .142

5.4.1 Number of services permitted 142

5.4.2 Consumer's installation not to be supplied through another building .143

5.4.3 Conductors considered outside of a building .143

5.4.4 Other conductors in raceway or cable ..144

5.4.5 Clearance from building openings .144

5.5 Service equipment .1445.5.1 General ...144

5.5.2 Control ...145

5.6 Wiring methods .148

5.6.1 Underground consumer's service conductors . 148

5.6.2 Overhead consumer's service conductors 148

5.7 Metering equipment ...149

5.7.1 Connection ..149

SECTION 6 CIRCUIT LOADING AND DEMAND FACTOR

6.1 Scope .150



6.4 General ..151

6.4.1 Current calculation .1516.4.2 Voltage drop... 151

6.4.3 Maximum circuit loading 151

6.4.4 Use of demand factor ..151

6.5 Services and feeders .151

6.5.1 Single-family dwellings 151


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6.5.2 Apartment and similar multi-family buildings .. 152

6.5.3 Schools ...153

6.5.4 Hospitals .153

6.5.5 Hotels, motels, dormitories, and buildings of similar occupancy ..154

6.5.6 Other types of occupancy 155

6.5.7 Branch circuits .155

6.5.8 Feeder demand factors for lifts 155

SECTION 7 EARTHING, BONDING, AND LIGHTNING PROTECTION

PART I - EARTHING, AND BONDING

7.1 Scope ..157

7.2 Normative references ..157

7.3 System and circuits earthing 1587.3.1 Direct current. systems 158

7.3.2 Alternating - current systems ..158

7.4 Location of system earthing connections 159

7.4.1 D.C. systems ...159

7.4.2 A.C. systems ...159

7.4.3 Isolated systems ..159

7.4.4 Single service supply to two or more buildings or structures ...160

7.4,5 Conductors to be earthed 160

7.4.6 Current over earthing conductor .160

7.5 Bonding 161

7.5.1 Non-current carrying metal parts ..161

7.5.2 Exposed non-current-carrying metal parts of equipment ..161

7.5.3 Non-metallic wiring systems .161

7.5.4 Non-electrical services .161

7.5.5 Extraneous fixed metalwork 164

7.6 Method of earthing ...164

7.6.1 Effective earthing .164

7.6.2 Common earthing conductor 164

7.6.3 Common earthing electrode 164

7.6.4 Underground service .165


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7.6.5 Short section of raceway .165

7.6.6 Fixed equipment ...165

7.7 Bonding methods ...166

7.7.1 Clean surface ... 166

7.7.2 Bonding at service equipment .166

7.7.3 Means of assuring continuity at service equipment .. 166

7.7.4 Metal armor or tape of service cable167

7.7.5 Bonding at other than service equipment .. 167

7.7.6 Loosely jointed metal raceways .167

7.7.7 Bonding jumpers .. 167

7.8 Earthing electrodes ..168

7.8.1 General.. 168

7.8.2 Service pipe electrode.168

7.8.3 Artificial earthing electrodes .169

7.9 Earthing and bonding conductors .171

7.9.1 General .171

7.9.2 Installation of system earthing conductors .172

7.9.3 Installation of equipment bonding conductors .173

7.9.4 Earthing conductor size for d.c. circuits .174

7.9.5 Earthing conductor size for a.c. system .1747.9.6 Bonding conductor size .174

7.10 Earthing and bonding conductor connections ..175

7.10.1 Bonding. conductor connection to raceways 175

7.10.2 Earthing conductor connection to water pipe electrodes .175

7.10.3 Earthing conductor connections to other than water pipe electrodes .175

7.10.4 Bonding conductor connection to circuits and equipment 176

7.10.5 Earthing conductor cQJ111Cction to electrodes ..176

SECTION 7 EARTHING, BONDING AND LIGHTNING PROTECTION

PART II - LIGHTNING PROTECTION

7.11 Scope .178



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7.14 Materials .180

7.14.1 General .180

7.14.2 Galvanic compatibility .180

7.14.3 Corrosion protection .181

7.14.4 Mechanical protection .181

7.14.5 Use of aluminum .181

7.15 Form and size .184

7.15.1 Air termination .184

7.15.2 Conductors .185

7.15.3Earth termination .185

7.15.4 Minimum dimension .185

7.16 Air termination .185

7.16.1 General .185

7.16.2 Support .185

7.16.3 Metallic projections .185

7.16.4 Metallic materials .186

7.16.5 Structure within zone .of protection ... 186

7.16.6 Air termination on roof .186

7.16.7 Air termination on reinforced concrete structure .186

7.17 Down conductor ...186

7.17.1 General ..186

7.17.2 Routing . 187

7.17.3 Recommended number . 187

7.17.4 Mechanical protection ...187

7.17.5 Corrosive soil ........... 187

7.17.6 External routes not available .187

7.17.7 Lift shafts ..188

7.17.8 Re-entrant loops .188

7.17.9 Sharp bends ...188

7.17.10 Bonding to prevent side flashing .188

7.1 7.11 Bonds ... 188

7.17.12 Test points ...189


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7.18 Earth termination .................... ....... 190

7.18.1 Termination..190

7.18.2 Resistance to earth .190

7.18.3 Earth electrodes.190

7.18.4 Connection point .190

7.19 Common earthing ...192

7.19.1 Common earth potential . 192

7.19.2 Common earth bonding .. 192

7.20 Use of reinforcement for earthing in concrete Structures .193

7.20.1 General..193

7.20.2 Electrical continuity .193

7.20.3 Prestressed concrete members .193

7.20.4 Precast concrete members .193

7.21 Structural steel framing for lightning protection .194

7.21.1 General ...194

7.21.2 Air termination . 194

7.21.3 Connection .194

7.21.4 Earthing .194

7.21.5 Interconnection .194

Annex (Informative)

Annex A - System design .219

Annex B - Consultation .220

SECTION 8 WIRING METHODS

8.1 Scope .223

8.2 Normative reference .2238.3 General requirements .223

8.3.1 Methods of installations .223

8.3.2 Wiring in ducts and plenum chambers .224

8.3.3 Underground installations .224

8.3.4 Conductors in hoist ways .225


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8.4 Conductors .226

8.4.1 Types of conductors .226

8.4.2 Radii of bends in conductors .226

8.4.3 Conductor joints and splices .227

8.4.4 Supporting of conductors .228

8.5 Open wiring .228

8.5.1 Open and clipped direct .228

8.5.2 Spacing of conductors .228

8.5.3 Conductor supports .229

8.5.4 Spacing of supports .229

8.6 Exposed wiring on exterior of buildings and between Buildings on the same premises ...229

8.6.1 Location of conductors. 229

8.6.2 Clearance of conductors .229

8.6.3 Power supply conductors .229

8.7 Bare bus bars and risers .230

8.8 Installation of boxes, cabinets, outlets and terminal fittings .230

8.8.1 Number of outlets per circuit .230

8.8.2 Outlet boxes ..231

8.8.3 Conductors in boxes .231

8.8.4 Terminal fittings .231

8.9 Cables, conductors and wiring methods .232

Annex A (Normative): Schedule of methods of installation of cables .233

SECTION 9 PROTECTION AND CONTROL

9.1 Scope ...2379.2 Normative references .237


9.3.1 Protective and control devices .237

9.3.2 Types and ratings of protective and control devices .238

9.4 Protective devices ...238


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9.4.1 Over current devices .238

9.4.2 Earth fault protection .239

9.5 Fuses .240

9.6 Circuit breakers ...240

9.7 Control devices ...240

9.8 Switches ..241

9.9 Protection and control of miscellaneous apparatus .241

SECTION 10 CLASS 1 AND CLASS 2 CIRCUITS

10.1 Scope ...245


10.3 Classification ...24510.3.1 General .245

10.3.2 Class 1 extra-low-voltage power circuits .246

10.3.3 Class 2 low-energy power circuits .246

10.3.4 Hazardous location .246

10.3.5 Circuits to safety control devices .246

10.3.6 Circuits in communication cables . 246

10.4 Class 1 circuits .247

10.4.1 Limitation of Class 1 circuits .247

10.4.2 Methods of installation for Class 1 circuits ...247

10.4.3 Overcurrent protection of Class 1 circuits ....247

10.4.4 Location of overcurrent devices in Class 1 circuits .. 247

10.4.5 Class I extra-low-voltage power circuit sources including Transformers ... 248

10.4.6 Conductor material and sizes .248

10.4.7 Insulated conductors for Class 1 wiring ...248

10.4.8 Conductors of different circuits in the ,same enclosure, cable, or Raceway .248

10.4.9 Mechanical protection of remote-control circuits .24910.4.10 Class 1 circuits extending aerially beyond a building ...249

10.5 Class 2 circuits ... 249

10.5.1 Limitations of Class 2 circuits 249

10.5.2 Methods of installation on supply side of overcurrent protection

or Transformers or other devices for Class 2 circuits .250


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10.5.3 Marking ..250

10.5.4 Overcurrent protection for Class 2 circuits 250

10.5.5 Location of over current devices 251

10.5.6 Conductors for Class 2 circuit wiring ..251

10.5.7 Separation of Class 2 circuit conductors from other circuits ..251

10.5.8 Conductors of different Class 2 circuits in the same cable, enclosure,

or raceway ...252

10.5.9 Penetration of a fire separation 252

10.5.10 Conductors in vertical shafts and hoistways 252

10.5.11 Class 2 conductors and equipment in ducts and plenum chambers .... 252

10.5.12 Equipment located on the load side of overcurrent protection,

transformers, or current-limiting devices for Class 2 circuits 252

10.5.13 Class 2 circuits extending beyond a building ..253

10.5.14 Underground installations 253

SECTION 11 INSTALLATION OF ELECTRICAL EQUIPMENT

11.1 Scope ...254


11.3 General .254

11.3.1 Fusible equipment .254

11.3.2 Connection to identified terminals or leads .254

11.3.3 Equipment over combustible surfaces .255

11.3.4 Installation of ventilated enclosures .255

11.3.5 Outdoor installations ..255

11.4 Electric heating and cooking appliances .255

11.4.1 Location of non-portable appliances .255

11.4.2 Rating of portable appliances ..255

11.4.3 Appliance exceeding 1500 W . 256

11.5 Heating equipment .. 25611.6 Submersible pumps ...256

11.7 Motors and associated circuits .257

11.7.1 Wiring methods and conductors .257

11.7.2 Overcurrent protection .260

11.7.3 Overload and overheating protection .262

11.7.4 Under voltage protection . 265


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11.7.5 Control .266

11.7.6 Disconnecting means .267

11.8 Air conditioning and refrigerating equipment .268

11.8.1 General ...268

11.8.2 Branch circuit .268


11.8.4 Supply cords . 269

11.9 Storage batteries ...269

11.9.1 Location of storage batteries .269

11.9.2 Ventilation of battery rooms or areas .269

11.9.3 Battery vents .269

11.9.4 Battery installation.269

11.9.5 Wiring ..270

SECTION 12 HAZARDOUS LOCATIONS

12.1 Scope ....279

12.2 Nonnative reference ..279

12.3 Classification ..279

12.3.1 Division of Class I locations . 279

12.3.2 Division of Class II locations .280

12.3.3 Division of Class III locations .281


12.4.1 Electrical equipment .281

12.4.2 Marking ..282

12.4.3 Non-essential electrical equipment .283

12.4.4 Equipment rooms . 283

12.4.5 Cable trays ... 284

12.5 Class I locations ...284

12.5.1 Installations in Class I, Division 1 locations 284

12.5.2 Installations in Class I, Division 2 locations ..286

12.6 Class II locations ...287


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12.6.1 Installations in Class II, Division 1 locations ...287

12.6.2 Installation in Class II, Division 2 locations ... 289

12.7 Class III locations ..290

12.7.1 Installations in Class III, Division 1 locations ..290

12.7.2 Installations in Class III, Division 2 locations ..293

SECTION 13 FLAMMABLE LIQUID DISPENSING AND SERVICE

STATIONS, GARAGES, BULK STORAGE PLANTS, FINISHING PROCESSES

AND AIRCRAFT HANGARS

13.1 Scope .294


13.3 Gasoline dispensing and service stations .295

13.3.1 Hazardous areas .295

13.3.2 Wiring and equipment within hazardous areas ..296

13.3.3 Wiring and equipment above hazardous areas ..297

13.4 Commercial garages, repairs and storage 297


13.4.2 Wiring and equipment in hazardous areas 298

13.4.3 Wiring above hazardous areas ..298

13.4.4 Equipment above hazardous areas ..298

13.5 Residential storage garages 298

13.5.1 Non-hazardous location298

13.5.2 Hazardous location .299

13.5.3 Wiring ... 299

13.6 Bulk storage plants ... 299


13.6.2 Wiring and equipment in hazardous areas ..302

13.6.3 Wiring and equipment above hazardous areas .302

13.7 Finishing processes .302


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13.7.1 Hazardous locations 302

13.7.2 Wiring and equipment in hazardous areas .304

13.7.3 Wiring and equipment above hazardous areas 305

13.8 Aircraft hangars 305

13.8.1 Hazardous areas.305

13.8.2 Wiring and equipment in hazardous areas 306

13.8.3 Wiring not within hazardous area 306

13.8.4 Equipment not within hazardous areas ... 307

SECTION 14 PATIENT CARE AREAS

14.1 Scope..308

14.2 Nonnative references .30814.3 Definitions ....308

14.4 Circuits in basic care areas .311


14.4.2 Bonding to earth in basic-care areas .311

14.4.3 Socket outlets in basic-care areas .312

14.5 Circuits in intermediate and critical-care areas .313


14.5.2 Bonding to earth in intermediate and critical-care areas . 313

14.5.3 Receptacles in intermediate-and critical-care areas .313

14.6 Isolated systems .. 314

14.6.1 Sources of supply 314

14.6.2 Single-phase isolated circuits . 314

14.6.3 Three-phase isolated systems .315

14.7 Essential electrical systems .31514.7.1 Circuits in essential electrical systems .315

14.8 Transfer switches . 316

14.9 Emergency supply ....316

SECTION 15 INSTALLATION OF LIGHTING EQUIPMENT


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15.1 Scope .... 3 18


15.3 Interior lighting equipment .318

15.3.1 General . 318

15.3.2 Location of lighting equipment .320

15.3.3 Installation of lighting equipment .323

15.3.4 Wiring of lighting equipment .323

15.3.5 Earthing of-lighting equipment .326

15.3.6 Electric-discharge lighting systems operating at 1000V or less ..326

15.4 Outdoor lighting equipment .327

15.4.1 General...327

15.4.2 Permanent outdoor floodlighting installation ...328

15.4.3 Exposed wiring for permanent outdoor lighting ..331

Annex A (Normative) ...334

SECTION 16 FIRE ALARM SYSTEM AND FIRE. PUMPS

16.1 Scope .344

16.2 Normative references ..344

16.3 Definitions .....344

16.4 Design consideration .346

16.4.1 General ..346

16.4.2Circuit design .347

16.4.3 Manual call points .348

16.4.4 Selection of fire detectors .349

16.4.5 Sitting of detectors .350

16.4.6 Sitting of heat sensitive (point) detectors.350

16.4.7 Vibration combined with rapid temperature change .. 35316.4.8 Sitting of heat-sensitive (line) detectors.354

16.4.9 Sitting of smoke-sensitive detectors .354

16.4.10 Audible and visual alarms .354

16.5 Cables and wiring .356

16.5.1 Cables..356


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16.5.2 Wiring method .357

16.6 Equipment bonding .359

16.6.1 Exposed non-current carrying metal part.359

16.6.2 Bonding conductor ..359

16.7 Power supply system ..359

16.7.1 Operating voltage.359

16.7.2 Sources of power .359

16.7.3 Current supply .360

16.8 Fire pumps ...361

16.8.1 Conductors ..361


16.8.3 Consumers service for fire pumps .361

16.8.4 Protection ...362

Annex A (Informative) ..363

Annex B (Informative) .365

SECTION 17 SIGNS AND OUTLINE LIGHTING

17.1 Scope.371



17.3.1 Construction .371


17.3.3 Rating of disconnecting means and control devices ..372

17.3.4 Thermal protection.372

17.3.5 Branch. circuit capacity .372

17.3.6 Location ...37217.3.7 Bonding ...373

17.3.8 Protection of sign leads ...373

17.3.9 Installation of conductors .373

17.3.10 Fuse holders and flashers .373

17.4 High-voltage luminous discharge tube signs and outline Lighting ..373


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17.4.1 Enclosure ...373

17.4.2 Protection of uninsulated part .374

17.4.3 Transformers ...374

17.4.4 High-voltage wiring methods .375

SECTION 18 LIFTS, ESCALATORS AND SIMILAR EQUIPMENT

18.1 Scope .377


18.3 General ...377

18.3.1 Voltage limitation . 377

18.3.2 Live parts enclosed.377

18.4 Conductors ..37818.4.1 Installation of conductors .378

18.4.2 Minimum size of conductors .378

18.4.3 Motor circuit conductors .379

18.5 Wiring ..379

18.5.1 Wiring methods .379

18.5.2 Branch circuits for auxiliary systems .380

18.6 Installation of conductors .380

18.6.1 Number of conductors in raceway ....380

18.6.2 Supports ...380

18.6.3 Different systems in one raceway or travelling cable . 380

18.6.4 Wiring in hoistway ...381

18.6.5 Electric equipment in garages and similar occupancies .381

18.6.6 Sidewalk lifts .381

18.7 Traveling cables ...38118.7.1 Suspension ...381

18.7.2 Hazardous (classified) location .382

18.7.3 Protection against damage .382

18.7.4 Installation .382

18.8 Disconnecting means and control .382


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18.8.1 General ...382

18.8.2 Type ...383

18.8.3 Location.383

18.8.4 Phase protection.383

18.9 Overcurrent protection .383

18.9.1 Control and operating circuits .383

18.9.2 Motors .384

18.10 Machine room ..384

18.10.1 Guarding equipment .384

18.10.2 Clearance around control panels and disconnecting means .384

18.11 Earthing...384

18.11.1 Metal raceway attached to cars .384

18.11.2 Electric lifts .385

18.11.3 Non-electric lifts .385

18.11.4 Method of bonding .385

18.12 Overspeed ...385

18.12.1 Overspeed protection .385

18.12.2 Motor-generator overspeed device .386

18.13 Emergency power ..386

18.13.1 Supply .386

18.13.2 Disconnection .386

18.13.3 Hydraulic lifts disconnecting means .386

18.14 Machine rooms and hoistway pits lighting and Auxiliary .386

18.14.1 Machine room .386

18.14.2 Hoist pits .387

SECTION 19 THEATRE INSTALLATION

19.1 Scope.388

19.2 Normative references ...388

19.3 Wiring method ..388


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19.4 Fixed stage switchboard .389

19.4.1 Fuses ...389

19.4.2 Overcurrent protection . 389

19.4.3 Dimmers .....390

19.4-4 Control of stage and gallery pockets.390

19.4.5 Conductors ..390

19.5 Portable switchboard on stage .391

19.5.1 Construction of portable switchboards .391

19.5.2 Supply for portable switchboard .391

19.6 Fixed stage equipment .391

19.6.1 Footlights ..391

19.6.2 Metal work ...391

19.6.3 Clearance at terminals .392

19.6.4 Mechanical protection of lamps in borders, etc .392

19.6.5 Suspended fixtures .392

19.6.6 Connections at lamp holders .392

19.6.7 Ventilation for mogul lampholders.392

19.6.8 Conductor insulation for field-assembled fixtures .392

19.6.9 Branch circuit overcurrenf protection .392

19.6.10 Pendant lights rated more than l00 W .393

19.6.11 Cables for border lights ..39319.6.12 Wiring to arc pockets .393

19.6.13 Socket outlets and plugs .393

19.6.14 Curtain motors .394

19.6.15 Flue damper control .394

19.7 Portable stage equipment .394

19.7.1 Fixtures on scenery .394

19.7.2 String or festooned lights .395

19.7.3 Flexible conductors from portable equipment .395

19.7.4 Portable equipment for stage effects ....395

SECTION 20 EMERGENCY SYSTEMS, UNIT EQUIPMENT, AND EXIT

SIGNS


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20.1 Scope 396

20.2 Normative reference ..396

20.3 General ..396

20.3.1 Adequate capacity .396

20.3.2 Instruction .397

20.3.3 Batteries maintenance .397

20.3.4 Lamps .397

20.3.5 Circuits ...397

20.3.6 Method of wiring .397

20.4 Emergency systems .398

20.4.1 Supply ...398

20.4.2 Control ..398

20.4.3 Overcurrent protection .398

20.4.4 Audible and visual trouble-signal devices .398

20.5 Unit equipment .399

20.5.1 Mounting .399

20.5.2 Supply connections .400

20.6 Exit signs ...401

20.6.1 Power supply ..401

20.6.2 Wiring .401

SECTION 21 MOTION PICTURE STUDIOS, PROJECTION ROOMS, FILM

EXCHANGES AND FACTORY

21.1 Scope .402


21.3 General ..402


21.4 Viewing, cutting and patching table fixture .403

21.5 Film-vaults and storage rooms .403

21.5.1 Equipment in film vaults and storage rooms .403

21.5.2 Wiring method in film-vaults .403

21.5.3 Lighting fixtures in film-vaults .403


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21.5.4 Film-vault circuits ..404

21.6 Motion picture projection rooms ...404

21.6.1 Lamps in projection rooms .404

21.6.2 Arc lamp current supply .404

21.6.3 Ventilation ..404

21.7 Motors and generators ...404

SECTION 22 DIAGNOSTIC IMAGING INSTALLATION

22.1 Scope ...405


22.3 Definitions ...40522.4 High-voltage guarding .406

22.5 Connections to supply circuit .406

22.6 Disconnecting means .406

22.7 Transformers and capacitors .407

22.8 Control .407

22.9 Ampacity of supply conductors and rating of overcurrent protection .408

22.10 Bonding .408

SECTION 23 ELECTRICAL COMMUNICATION SYSTEMS

23.1 Scope ... 409

23.2 Nonnative reference .409

23.3 General ...409

23.3.1 Circuits in communication cables .409

23.3.2 Hazardous locations ..410

23.3.3 Approved transformers ..410

23.4 Inside conductors .410

23.4.1 Conductors arrangement .410

23.4.2 Insulation ...410

23.4.3 Earthing conductors with an outer metal covering ..410

23.4.4 Separation from other conductors ..410

23.4.5 Penetration of a fire separation 411


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23.4.6 Communication cable in hoistways .411

23.4.7 Communication conductors in ducts and plenum chambers ..412

23.4.8 Data processing systems .412

23.4.9 Conductors under raised floors .412

23.4.10 Conductors in concealed installations .412

23.4.11 Type CFC under-carpet wiring system .413

23.5 Equipment ..414

23.5.1 Communication equipment in bathrooms ..414

23.5.2 Equipment in air ducts, plenums, or suspended ceilings .414

23.5.3 Exposed equipment and terminations . 415

23.5.4 Earth circuits ...415

23.5.5 Communication systems in hospitals .415

23.6 Outside conductors ...415

23.6.1 Overhead conductors on poles .415

23.6.2 Overhead conductor$ on roofs .415

23.6.3 Lightning conductors .416

23.6.4 Swimming pools .416

23.7 Underground circuits.416

23.7.1 Direct buried systems ..416

23.7.2 Underground raceway .417

23.8 Earthing 417

23.8.1 Bonding of cable sheath ..417

23.8.2 Cable-sheath bonding conductor .418

23.8.3 Earthing electrode .418

23.8.4 Earthing electrode connection .419

23.8.5 Bonding of electrodes ..419

SECTION 24 COMMUNITY ANTENNA INSTALLATION FOR RADIO AND

TELEVISION RECEPTION

24.1 Scope ...420.

24.2 Normative references...420

24.3 Technical requirements.421


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24.3.1 Mechanical . 421

24.3.2 Electrical ..421

24.4 Equipment ..421

24.4.1 Community antenna distribution amplifiers and other power sources..421

24.4.2 Exposed equipment and terminations ..422

24.4.3 Equipment earthing ..422

24.5 Community antenna distribution network .422

24.5.1 Conductor ..422

24.5.2 Voltage limitation .422

24.5.3 Hazardous locations ..423

24.5.4 Supports .423

24.5.5 Earthing of outer conductive shield of a coaxial cable .423

24.5.6 Earthing conductor .423


24.5.8 Earthing electrode connection .424

24.6 Conductors within buildings .424

24.6.1 Separation from other conductors .424

24.6.2 Conductors in a vertical shaft .425

24.6.3 Penetration of a fire separation .426

24.6.4 Community antenna distribution conductors in ducts and plenum Cambers ... 42624.6.5 Raceways ...426

24.7 Conductors outside of buildings .426

24.7.1 Overhead conductors on poles.426 .

24.7.2 Overhead conductors on roofs ...426

24.7.3 Conductors on buildings..426

24.7.4 Conductors entering buildings .427

24.7.5 Swimming pools .427

24.8 Underground conductors .427

24.8.1 Direct buried systems ..427

24.8.2 Underground raceway.428

24.8.3 Underground block distribution ..429


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24.9 Lightning arresters for receiving stations .429

24.9.1 Lightning arrester .429

24.9.2 Earthing conductor ...429


Annex A (Informative) ...431

SECTION 25: SWIMMING POOLS, FOUNTAINS AND SIMILAR

INSTALLATIONS

25.1 Scope .. 446

25.2 Normative reference .446

25.3 Definitions ...446

25.4 General ..44725.4.1 Equipment installation .447

25.4.2 Overhead wiring .448

25.4.3 Underground wiring .448

25.4.4 Bonding to earth .449

25.4.5 Junction and deck boxes .450

25.4.6 Transformers and transformer enclosure .451

25.4.7 Socket outlets ..452

25.4.8 Luminaries and lighting equipment ..452

25.4.9 Earth-fault circuit breakers .454

25.5 Permanently installed swimming pools .455

25.5.1 General .455

25.5.2 Conduit type .455

25.5.3 Circuit segregation ..455

25.5.4 Drainage ....455

25.6 Storable swimming pools .45525.6.1 Electrical equipment ...455

25.6.2 Pumps .456

25.7 Hydromassage bathtub .456

25.7.1 Protection .456

25.7.2 Control ..456


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25.7.3 Other electric equipment ..457

25.8 Spas and hot tubs ...457

25.8.1 Bonding to earth .457

25.8.2 Controls and other electrical equipment .457

25.8.3 Leakage current .458

25.8.4 Field-assembled units ...458

Annex A (Informative) ..460

SECTION 26: SOLAR PHOTOVOLTAIC SYSTEM

26.1 Scope

26.2 Normative References

26.3 Special Terminology

26.4 Marking

26.5 maximum Photovoltaic Source Circuit and Output Circuit Voltage

26.6 Voltage drop

26.7 Ampere Rating of Photovoltaic Source Circuits

26.8Overcurrent Protection for Apparatus and Conductors

26.9Photovoltaic dc arc-fault circuit protection

26.10 Disconnecting means

26.11 Wiring Method

26.12 Attachment plugs and similar wiring devices

26.13 Module Connection Arrangement

26.14 Interconnected System Connection

26.15 Solar photovoltaic systems earthing

26.16 Power conditioning unit

SECTION 27: RENEWABLE ENERGY SYSTEMS

27.1 Scope

27.2 Normative References

27.3 Special Terminology

27.4 General

27.5 Overcurrent Protection

27.6 Disconnecting Means


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27.7 Wiring method

27.8 System Earthing

27.9 Ungrounded Renewable Energy Power Systems

27.10 Earthing Electrodes and Earthing conductors

27.11 Equipment bonding

27.11 Marking27.12 Warning notice and diagram

27.13 Interconnections to other Circuits

27.14 Interconnected system connection

27.15 Loss of interactive system power

27.16 Systems in excess of 750 V dc

12.17 INVERTERS

27.17.1 Maximum circuit loading

27.17.2 Stand-alone systems

27.17.3Utility-interactive inverters mounted in locations that are not readily accessible

27.17.4 Connection to other sources

27.17.5 Ampacity of neutral conductor

27.17.6 Unbalanced interconnections

27.17.7 Utility-interactive point of connection

27.18 STATIONARY FUEL CELL SYSTEMS

27.18.1 Marking

27.18.2 Conductors

27.18.3 Overcurrent protection

27.18.4 Disconnecting means

27.18.5 Wiring methods

27.18.6 Grounding and bonding

27.18.7 Location of Fuel Cells

27.18.8 Outdoor installations

27.18.9 Indoor installations

27.18.10 Electrical equipment

27.19 SMALL WIND SYSTEMS

27.19.1 Marking

27.19.2 Maximum voltage

27.19.3 Conductors


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27.19.5 Overcurrent protection for apparatus and conductors



27.19.8 Lightning protection systems

27.19.9 Diversion load controllers

27.19.10 Surge protective devices

27.19.11 Installation and service of a wind turbine

27.20 LARGE WIND SYSTEMS

27.20.1 Marking

27.20.2 Conductors




27.20.6 Lightning protection systems

27.20.7 System demarcation point

27.21 MICRO-HYDROPOWER SYSTEMS

27.21.1 Marking

27.21.2 Conductors






27.22 HYDROKINETIC POWER SYSTEMS

27.22.1 Marking

27.22.2 Conductors







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27.23 STORAGE BATTERIES

27.23.1 Installation

27.23.2 Current limiting

27.23.3 Battery non-conductive cases and conductive racks

27.23.4 Disconnection of series battery circuits

27.23.5 Battery systems of more than 48 V

27.23.6 Battery interconnections

27.23.7 Charge control

27.23.8 Diversion charge controller

SECTION 28: GRAPHICAL SYMBOLS

28.1 Scope .462



28.4 Symbols ..463

Annex A - (Informative) .470

Annex B - (Informative) .471

Appendices

Appendix I Inspection and testing .A-1

Appendix 2 Forms of completion and inspection certificate .A-9

Documents

EBCS 10 Content