Contents Hospital Isolation Equipment - Eatonpub/@electrical/...analog or digital panel meter. A visual and audible alarm occurs when the hazard current exceeds 2 or 5 milliamperes

CA08104001E For more information visit:

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January 2003

Contents

Hospital Isolation Equipment 36.0-1

36

Medical Systems

Ref. No. 1313

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Description Page

Hospital Isolation Equipment

General Description of Product Family . . . . . . . . . . . . . . . . . . . . . . . . . . .

36.0-2

Advantages of Isolated Power Systems (IPS) . . . . . . . . . . . . . . . . . . . . . .

36.0-3

Isolated Power Panels (Type IPP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

36.0-6

Isolated Power Centers (Type IPC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

36.0-7

X-Ray and Laser Power Centers (Types XPC and LPC) . . . . . . . . . . . . . . .

36.0-8

Surgical Facility Centers (Type SFC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

36.0-9

Line Isolation Monitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

36.0-10

Specifications

For complete product specifications in CSI format seeEaton’s Cutler-Hammer Product Specification Guide. . . . . . . . . . . . .

Section 16473

Line Isolation Monitors

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36.0-2

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36

Medical Systems

General Description

Ref. No. 1314

Medical Systems

Description

Eaton’s Cutler-Hammer business, the leader in electrical distribution prod-ucts, has teamed with Isotrol Systems, a division of Bender, to offer a com-plete line of electrical products for use in the healthcare industry. All products meet or exceed UL

T

, CSA

T

and NFPA standards. The entire product family integrates the use of isolated power supplies, continuous monitoring for hazardous conditions, and testing of circuit conditions with maximum selectivity of tripping overcurrent devices when hazards develop, and highest patient and operator safety.

Isolated Power Systems are typically used in the emergency electrical distri-bution circuits associated with Life Safety and Critical Care areas within a health care facility. See

Figure 36.0-1

for details. For further details reference the IEEE White Book — Recommended Practice for Electrical Systems in Health Care Facilities — ANSI/IEEE Standard 602.

A brief description of select IPS prod-ucts and their purpose follows.

Isolated Power Panels and Power Centers

Type IPP Isolated Power Panels are designed to provide isolated power to electrical circuits installed in operating rooms and other electrically susceptible patient care areas. Each IPP includes a single- or 3-phase transformer, a Line Isolation Monitor (LIM), a reference ground bus, a primary circuit breaker, and a number of branch circuit breakers all in a #14 gauge galvanized steel box with #14 gauge stainless steel (#304) cover with a brushed finish. Single-phase applications are available from 3 – 25 kVA, and 3-phase applications are available from 10 – 25 kVA. For more IPP details see

Page 36.0-6

.

Figure 36.0-1. Health Care Facility — Simplified Power Distribution Arrangement

Type IPC Isolated Power Centers are identical to the IPP product with the addition of an eight gang section for Hospital Grade power receptacles and ground jacks. For more IPC details see

Page 36.0-7

.

The LIM integral to each IPP or IPC displays the incremental changes in ground leakage current as additional medical apparatus is plugged into the receptacles and displays the total system leakage current that will flow through a solidly grounded person who comes in contact with an ener-gized phase conductor either directly or through an insulation failure.

X-Ray and Laser Isolated Power Centers

Types XPC and LPC X-Ray and Laser Isolated Power Centers are designed to provide isolated power to x-ray and laser receptacles within operating rooms and other electrically suscepti-ble areas. Each XPC and LPC includes a single- or 3-phase transformer, a Line Isolation Monitor (LIM), a reference ground bus, a main breaker, branch breakers, contactors, selector station with pushbuttons and LED indicating lights, and a Programmable Logic Controller (PLC) all contained within a #14 gauge box and stainless steel (#304) cover. For more details on the XPC and LPC product, see

Page 36.0-8

.

Surgical Facility Centers

Type SFC Surgical Facility Centers are designed to provide isolated power to electrical circuits installed within operating rooms and other electrically susceptible patient care areas. Each SFC includes a single-phase trans-former, a Line Isolation Monitor (LIM), a reference ground bus, a primary breaker, up to 16 branch breakers, up to eight Hospital Grade power receptacles, up to eight Hospital Grade ground jacks, a two-section X-Ray Viewer, a clock and elapsed timer, and an AM/FM stereo system with cassette and/or CD player. All equipment is mounted in a #12 gauge galvanized steel box with #12 gauge stainless steel (#304) brushed cover on the SFC product, see

Page 36.0-9

.

Line Isolation Monitors

Type LIM Line Isolation Monitors are available for single-phase or 3-phase applications, 50 or 60 Hz, 24, 100, 110, 120, 200, 208, 220, 230, 240 and 277V AC system voltages. Two separate ground connections are provided for added safety when the LIM is wired into an Isolated Power System (IPP, IPC, XPC, LPC or SFC).

The LIM measures and displays the total hazard current (leakage current) for all medical equipment connected to the branch circuit wiring on an analog or digital panel meter. A visual and audible alarm occurs when the hazard current exceeds 2 or 5 milliamperes. The audible alarm may be muted, however the visual alarm remains on for the duration of the high total hazard current.

A test switch can be activated to verify that the LIM is operating properly. The LIM has provisions for connecting one or more remote stations installed close to patient care areas. For more infor-mation on the LIM see

Page 36.0-10

.

G

Life SafetyBranch

DistributionPanelboard

CriticalBranch

EmergencySystem

IsolatedPowerPanel

CriticalCare Area

EmergencySystemReceptacles

•Color or marking•Panelboard + Circuit #•Hospital Grade (green dot)

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Dis

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36.0-3

January 2003


36

Medical Systems

Application Information — IPS

Ref. No. 1315

Advantages of Isolated Power Systems (IPS)

Isolated Power Systems (IPS) were first introduced into the hospital envi-ronment as a means of reducing the risk of explosions in operating rooms and other areas containing or using flammable anesthetizing agents. The IPS functions by “floating” the second-ary power lines so that ground faults, the primary source of equipment failure, can be recognized at an early stage, in a condition where they do not present first fault personal shock orincendiary hazards.

IPS systems offer additional advantages to system security and operational safety for both operators and patients. The isolated power system is recognized as the safest possible system and does provide an additional layer of safety to both patient and operator alike.

Today, hospitals no longer use flammable anesthetizing agents, and the use of isolated power is currently recommended only for use in “wet locations” where the loss of equip-ment power cannot be tolerated.

Reference to these facts may be found in the Health Care Facilities Handbook (Second Edition), and on page 214, Chapter 6, of the IEEE Recommended Practice for Electric Systems in Health Care Facilities (The IEEE white book) ANSI/IEEE Standard 602-1986.

The following discussion explains the advantages that IPS systems offer over conventional grounded systems and the Ground Fault Circuit Interrupter (GFCI).

The Grounded System

Figure 36.0-2

shows a conventional grounded system. The neutral of the transformer is bonded to ground. In

Figure 36.0-3

, we assume that a person has a body resistance of 1000 ohms.

If the 1000-ohm body touches the line L, a current of 120 mA could flow from the line conductor, through the 1000-ohm person, and return to the system via the low impedance neutral-ground connection. This 120 mA could prove dangerous to such a 1000-ohm person.

Should the person have less ohmic resistance, due to excessive moisture or internal body connections, larger and more lethal currents could flow through his/her body should he/she come into contact with line L.

Figure 36.0-2. Conventional Grounded System has One Side of Power Line Connected to Ground. If the 1000-ohm Person Touches the Line (L), he will have 120 mA of Current Flowing Through his/her Body

Figure 36.0-3. Isolated Power System with 1000-ohm Person. Secondary Side has No Resistive Path to Ground, so if System Net Capacitance is Low, Human Could Contact Either Side of Power Line Safely

Figure 36.0-4. Schematic Representation of Typical Distributed Capacitance in an IPS

Figure 36.0-5. Equates to the Circuit Below

Figure 36.0-6. 1000-ohm Person in Contact with One Line Conductor and Ground

Table 36.0-1. Comparison of Voltage Across and Current Flowing Through a Person

The Isolated Power System (IPS)

Figure 36.0-3

shows an isolated power system. There is no intentional ohmic connection between the supply (neutral) and ground. The 1000-ohm person has greater protection from potentially lethal shock hazard because of the absence of the low impedance ground-system return path. However, there is always a “capacitive” path to ground because of the inherent system net capacitance between any line conductor and ground.

Figure 36.0-4

assumes a typical equally distributed, balanced capacitive system with small leakage current (50 microamps) flowing from L

1

via C

1

, through the ground, and returning to L

2

via C

2

. We can mea-sure the voltage drop across the system capacitance by using a high impedance voltmeter. In a balanced system as shown, we can expect to measure 60 volts from each line to ground. Leakage current may at this time be measured by connecting an mA or microamp meter from either L

1

or L

2

to ground.

The 50

µ

A assumed current means that each capacitance has an impedance of 1.2 x 10

6

ohms (Z = V/I = 60/(50 x 10

-6

) = 1.2 x 10

6

ohms). (50

µ

A is assumed because it represents a typical light load system leakage to ground.) 50

µ

A current corresponds to a capacitance of C = 2.2 x 10

-9

F or .002

µ

F (at 60 Hz). Now, should our 1000-ohm person come into contact with either side of the line, the maximum current that could flow through him/her would be only 100

µ

A as seen in

Figure 36.0-4

. Our 1000-ohm person coming into contact with L

1

has shunted one side of the high impedance paths to ground, and therefore will approxi-mately double the leakage current to 100 microamps, which is still an extremely low level for all but subcutaneous patient leakage paths.

120V208V

0V

L1000ΩN

G120V

120V

208V

C1

L1

1000Ω

G

60VL2

50µA

C2I

120VL1

60V50µA

L2

60V

1000Ω

120VL1

2.21 nF

L2

C2

V2V1

C1

2.21 nF

I

1000Ω

120VL1 L2

C2C1

Scenario Grounded IPS

Voltage overPerson

120V 0.1V (with 50 microampinitial leakage)

Current thruPerson

120 mA 100 microamp (with 50 microamp initial leakage)


36.0-4



CA08104001E

January 2003


36

Medical Systems


Ref. No. 1316

Voltage across the person would be:

Voltage across C

2

would be:

Current passing through our1000-ohm person would be:

Table 36.0-1

compares the effect of the grounded system vs. IPS with a grounded 1000-ohm person in contact with a line conductor of each system.

The Line Isolation Monitor

The Line Isolation Monitor (LIM) is a device which continually monitors the impedance (resistance and capacitance) from all lines (single- and 3-phase) to ground, and indicates the maximum current that could flow to a patient, should the patient come into contact with the line conductor (i.e., defective equipment).

Note:

many variables affect what current could actually flow to the patient:

1. The value of 1000 ohms may vary between less than 100 ohms to 20,000 ohms, depending on the condition of the patient (moisture content, muscle condition, dry skin, etc.).

2. Parallel leakage return paths will also bypass a portion of the leak-age current from the patient.

ICU and CCU areas, where the patient may be connected to several pieces of equipment (all of which contain their respective leakages, both resistive and capacitive) greatly add to the possibil-ity of hazardous leakage currents flow-ing. We must never neglect the fact that a leakage on a grounded system will return via the low impedance neutral-ground connection. The magnitude of this current is limited only by the impedance of the parallel paths to ground — for example, our 1000-ohm person.

The isolated system does not have any low-impedance connection to ground. It has a high-impedance capacitive/resistive return path. This provides the layer of electrical safety that protects both operators and patients alike.

Continuity of Supply

Probably the strongest argument for the use of isolated power is where continuity of supply is paramount.

Article 517-20 (1996 NEC) WetLocations states:

“All receptacles and fixed equipment within the area of the wet location shall have ground-fault circuit-interrupter protection for personnel if interruption of power under fault con-ditions can be tolerated, or be served by an isolated power system if such interruption cannot be tolerated.”

Let us examine the advantages of the IPS system to see how it compares with the alternatives: the grounded system and the GFCI (ground-fault circuit interrupter).

Figure 36.0-7

is a schematic representa-tion of both grounded and ungrounded power systems.

Figure 36.0-7. Schematic Representation of Both Grounded (A) and Ungrounded (B) Power Systems

In the grounded system we see that fault F1 will cause a

large

short-circuit current (I

sc

) to flow to ground and return to the supply by the equipoten-tial ground (G) and the neutral bond. The magnitude of this current will be limited only by the circuit and fault impedance, and typically will be in the thousands of amperes range. Obviously, fuse F will quickly blow or, in the case of a circuit breaker, quickly trip.

When we compare the same situation with the ungrounded system: Fault F

2

(same location as F

1

) will cause a

very small

current I

c

to flow to ground and return to the source via the system capacitance.

The magnitude of I

c

is limited by circuit and fault impedance which, in this case, is the system capacitance (assumed to be .002

µ

F).

I

c

= 120V/(1.2 x 10

6

Ω

) = 100 microamps

During fault F

2

, the line isolation monitor would quickly alarm the fault condition so that remedial action may be taken — but no fuses or circuit breakers will trip. Supply continuity has been maintained by using an IPS.

Isolated Power vs. GFCI

The ground-fault circuit interrupter (

Figure 36.0-8

) is a device that may be installed with a grounded power system. It reacts by tripping a circuit breaker should leakage current exceed the GFCI rating.

Figure 36.0-8. Schematic of GFCI Application

The unit operates simply by comparing the current flowing out to the load against current returning from the load. If both currents are equal, their resultant sum is zero; the circuit operates correctly.

10001201000-----------------------x120 0.1V=

1.2x106

1201000----------------------x120 119.9V=

120V1201000----------------------- 100microamps=

Source

A

Load

L

G

N

Isc

F1Fuse F

Source

B

Load

L2

F2

IcG

L1

Iin

Iout

Source

CB

GFCI

∆IG

N

L




36.0-5

January 2003


36

Medical Systems


Ref. No. 1317

Should the two currents not equal zero — i.e., a portion of the current returns to the source via another path, a residual current will be detected by the GFCI. Should this residual current be in excess of the GFCI trip rating (5 mA), the breaker will operate and cut off power to the circuit.

Important

— the GFCI does notprovide continuous and advanced monitoring of equipment and circuit condition, nor does it alert impending problems. The unit will simply trip without warning, and may be prone to nuisance tripping during erratic supply conditions.

Short-Circuit Currents

Extremely large short-circuit currents can flow in grounded systems (non-IPS) during a line-to-line or a line-to-ground fault condition. We shall now examine how the IPS can reduce these large and damaging short-circuit currents, which helps prevent a total system outage that could affect a large area of the hospital.

Figure 36.0-9

shows a one-line for both a grounded and an IPS distribution system.

Figure 36.0-9. Typical Distribution Arrangementfor IPS (left) and Grounded Systems (right)

Figure 36.0-10

represents the corre-sponding fault impedance diagram.

Figure 36.0-10. IPS (left) and Grounded System (right) Reduced to Fault Path Components

Assume a short-circuit fault occurs on a piece of equipment connected via a 10-foot (3 m) cable to the output 20 ampere circuit breaker of each system, and compare the results.

Calculations assume the above condi-tions with 208/120V transformer with 0.051 pu reactance and the infinite bus at system input. Cable impedance is assumed for 2 conductor, #12 AWG.

Figure 36.0-10

shows the instanta-neous currents that flow, and helps predict circuit breaker clearing.

Comparison of the two systems show that the IPS system experiences reduced magnitude of short-circuit current by a factor of approximately 4:1 on the secondary side of our two systems, and 7:1 on the primary side. Obviously, fault energy dissipation damage is proportionally reduced using IPS.

In this example, only one circuit on the IPS system, the faulty piece of equipment, would be disconnected. All other secondary circuits would be unaffected by this fault condition.

When we compare tripping of breakers with the grounded system, the 60 ampere breaker will trip and all second-ary 20 ampere circuits and connected equipment could be affected by power loss. Remember that in normal installa-tions, this main 60 ampere breaker could be feeding several circuits or several beds in an ICU or CCU.

The advantages of the IPS system in both reduced energy dissipation atthe point of fault, and continuity of supply for the connected consumers are apparent.

Noise Reduction

Increased use of sensitive electronic systems in the hospital environment has created a growing need to supply these systems with “clean” voltage, free of noise and transients. Many data storage and monitoring equipment are sensitive to line transients and line noise frequently present on voltage feeders. Noise has many sources — lightning strikes, switching surges, motors, SCRs, switched mode power supplies, and discharge lighting, to name but a few. Many manufacturers of voltage-sensitive equipment have recognized the problem created by transients and noise on their equip-ment’s input line and have provided a measure of protection as an integral part of their equipment. This protec-tion, however, may not be adequate for frequent or serious disturbances.

The IPS system contains a quality shielded isolation transformer which provides a convenient and effective means of reducing or even eliminating line-to-line and line-to-ground noise on voltage feeders.

The IPS’s shielded isolation trans-former can provide a 50 – 70 dB atten-uation of wideband line-to-ground (common-mode) noise.

Note:

dB = 20 log (V

1

/V

2

).

As an example, a large 1500V transient having a frequency of about 750 kHz, will be reduced by a factor of 3162.3 (70 dB) to a value of 0.47V by the shielded isolation transformer.

Although the primary reason for the IPS design and installation was not to achieve this attenuation, rather to provide a low leakage secondary power system, this is another “built-in” advantage when comparing isolated power with conventionally grounded systems.

208V

60A

5 kVA

120V

20A

IPS System Grounded System

120V

60A

120V

20A

208V

60 A.C.B.

5.1%

120V20 A.C.B.

Z Cable

Fault

Isc607A

Isc350A

IPS System

120V

60 A.C.B.

20 A.C.B.

Z Cable

Fault

Grounded System

Isc2300A

Isc2300A

Z Cable


36.0-6



CA08104001E

January 2003


36

Medical Systems

Technical Data

Ref. No. 1318

Isolated Power Panels (Type IPP)

Figure 36.0-11. Outline Drawing for IPPs Single- and Three-Phase 10 to 25 kVA

Figure 36.0-12. Wiring Diagram for IPPs Three-Phase 10 to 25 kVA

Table 36.0-2. IPP Ratings

1

Backbox size is reduced to 41-inch H x 24-inch W x 8-inch D (1041.4 mm H x 609.6 mm W x 203.2 mm D) for 3, 5, 7-1/2 and 10 kVA transformers.

Transformer kVA Ratings

1

Voltages Volts AC Branch Breakers

Primary SecondarySingle-Phase Three-Phase Single-Phase Three-Phase

3 5 7-1/210152025

152025

120208220230240277380400480

120208220230240

14 Maximum2-Pole(Plug-in or Bolt-on)

10 Maximum3-Pole(Plug-in or Bolt-on)

1-inch (25.4 mm)

w

PlanW

d

Front

A

A

H

i

j

f

CircuitBreakers

a

e

n

m

l

o

k

ch

h

d

b

View A-A

1-inch (25.4 mm)

g

To SystemGround

PanelGround

* MeteredRemoteOnlyTo RemoteIndicatorSeriesMK2450(if required)

LZ Series LIM

*

IncomingPower

i

1 2

3

5

7

9

4

6

8

10

L1 L2 L3OR

g

h

j

Note: The 3-phase isolation transformeris available in delta-delta andwye-delta configuration.

n

L1

12 Vac ComM-M+RI1

K1/NCK1/ComK1/NOSafe

HazardRI2

L2

GND2LIM GNDTest/L3

n

l

k

*

Table 36.0-3. IPP Dimensions

a

S/S front trim.

b

Backbox, galvanized steel.

c

Hat section, galvanized steel.

d

Branch breaker subchassis.

e

Breaker deadfront.

f Hinged door over circuit breakers.

g LIM circuit breaker.

h Loadcenter.

i Primary circuit breakers, 1-, 2-,or 3-phase.

j Branch circuit breakers, 1-, 2-,or 3-phase.

k Isolation transformer:Phases 1-Ph 3-PhPower rating: kVAPrimary voltage: VSecondary voltage: VFrequency: Hz

l Line isolation monitor, 1- or 3-phase, analog or digital.

m LIM connector plate.

n Reference ground bus.

o Vent-holes for convection air flow.

Back-boxType

Dimensions in Inches (mm)

h w d H W

C 48(1219)

30(762)

14(356)

50(1270)

32(813)


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36.0-7January 2003


36

Medical SystemsTechnical Data

Ref. No. 1319

Isolated Power Centers (Type IPC)

Figure 36.0-13. Outline Drawing for IPCs Single- and Three-Phase 10 to 25 kVA

Figure 36.0-14. Wiring Diagram for IPCs Three-Phase 10 to 25 kVA

Table 36.0-4. IPC RatingsTransformer kVA Ratings Voltages Volts AC Branch Breakers

Primary SecondarySingle-Phase Three-Phase Single-Phase

3 5 7-1/210

N/A 120208220230240277380400480

120208220230240

16 Maximum2-Pole(Plug-in Only)

w

W

Plan

A

A

H

Front

h

d

View A-A

i

g

j

f

o p

e

a

n

m

l

c

h

d

b

k

1-inch (25.4 mm)

1-inch (25.4 mm)

IncomingPower

hj

i

k

g

m

n

l

o

H2

H1

X1

X2

OR

IZ Series LIM

To SystemGround

PanelGround

To RemoteIndicatorSeriesMK2450(if required)

* Metered Remote Only

**

L1L2

12 Vac ComM-M+

K1/NCK1/ComK1/N0Safe

HazardR12

GND2LIM GNDTest/L3

RI11 2

3 4

5 6

7 8

9 10

11 12

p

Table 36.0-5. IPC Dimensions

a S/S front trim.

b Backbox, galvanized steel.

c Backplate, galvanized steel.

d Branch breaker subchassis.

e Breaker deadfront.



h Loadcenter.

i Primary circuit breakers, 1- or2-phase.

j Branch circuit breaker, 2-phase.

k Isolation transformer:Phases 1-PhPower rating: kVAPrimary voltage: VSecondary voltage: VFrequency: Hz

l Line isolation monitor, 1-phase,analog or digital.


n Ground bus.

o Hospital grade power receptacles.

p Hospital grade ground jacks.

Back-boxType


h w d H W

B 41(1041)

24(610)

8(203)

43(1092)

26(660)


36.0-8

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January 2003


36


Ref. No. 1320

X-Ray and Laser Power Centers (Types XPC and LPC)

Figure 36.0-15. Outline Drawing for XPC/LPC Single- and Three-Phase 10 to 25 kVA

Figure 36.0-16. Typical Circuit Arrangement for XPC/LPC

Table 36.0-6. XPC/LPC RatingsTransformer kVA Ratings Voltages Volts AC Branch Breakers

Primary SecondarySingle-Phase Three-Phase Single-Phase Three-Phase

10152025

10152025

120208220230240277380400480

120208220230240



Plan

w

W

H

A

A

d

h

o

q

l

n

me

k

h

d

c b

i

j

f

BranchCircuit

Breakers

p aFront View A-A

C1 C2 C4

C5 C6 C7 C8

1-inch (25.4 mm)

g

XFMR

PowerSection

ControlSection

NurseStation

Display

OutletDevice

In-UseLamp

DoorContact

Outlet

Rem

ote

Ind

icat

or

LIM

Ou

tpu

t

PLC

Inp

ut

Contactor

X-Ray and LaserIsolated Power Center

X-Ray and LaserReceptacle Module

Table 36.0-7. XPC/LPC Dimensions

a S/S front trim.


c Hat section, galvanized steel.





h Loadcenter.

i Primary circuit breakers, 1-, 2-,or 3-phase.

j Branch circuit breakers, 2- or3-phase.

k Isolation transformer:Phases 1-Ph 3-PhPower rating: kVAPrimary voltage: VSecondary voltage: VFrequency: Hz

l Line isolation monitor, 1- or3-phase, analog or digital.



o Vent-holes for convectionair flow.

p Programmable logiccontroller (PLC).

q Secondary circuit contactor(C1…C8).

Back-boxType


h w d H W

C 48(1219)

30(762)

14(356)

50(1270)

32(813)



36.0-9January 2003


36


Ref. No. 1321

Surgical Facility Centers (Type SFC)

Figure 36.0-17. Outline Drawing for SFCs Single-Phase 3 to 10 kVA

Figure 36.0-18. Wiring Diagram for SFCs Single-Phase 3 to 10 kVA

Table 36.0-8. SFC RatingsTransformer kVA Ratings Voltages Volts AC Branch Breakers

Primary SecondarySingle-Phase Three-Phase Single-Phase

3 5 7-1/215

N/A 120208220230240277380400480

120208220230240


00:0012:00

View B-B

Front

ABB

A

w

h

W

H

d

a

l

s

r

o

p

j

g

f

i

q

t

e

d

n

m

b

k

1-inch (25.4 mm)

View B-B

IncomingPower

hj

i

k

g

m

o

H2

H1

X1

X2

OR

IZ Series LIM

To SystemGround

PanelGround

To RemoteIndicatorSeriesMK2450(if required)

* Metered Remote Only *

*

L1L2

12 VAC ComM-M+

K1/NCK1/ComK1/N0Safe

HazardR12

GND2LIM GNDTest/L3

RI1

1 2

3 4

5 6

7 8

9 10

11 12

l

p

13 14

15 16 To Clock, Elapsed Timer andControl Station

(For Wiring Details, seeData Sheet on ZT1491Clock/Elapsed Timer)

n

ACDC Radio

To ExistingRoof Antenna

c

qr

X-RayViewer

ts

Table 36.0-9. SFC Dimensions

a S/S front trim.


c Power supply for stereo system.





h Loadcenter.

i Primary circuit breakers, 1- or2-phase.

j Branch circuit breaker, 2-phase.

k Isolation transformer:Phases 1-PhPower rating: kVAPrimary voltage: VSecondary voltage: VFrequency: Hz

l Line isolation monitor, 1-phase,analog or digital.



o Hospital grade power receptacles.

p Hospital grade ground jacks.

q Stereo system.

r Speakers.

s Clock.

t Elapsed timer.

Clock/elapsed timer remote control.

X-ray viewer.

Back-boxType


h w d H W

D 42(1067)

50(1270)

8(203)

44(1118)

52(1320)


36.0-10


January 2003


36


Ref. No. 1322

Line Isolation Monitors (Type LIM)

DigitalIZ1492 1-PhaseIZ1493 3-Phase

AnalogIZ1490 1-PhaseIZ1491 3-Phase

Figure 36.0-19. Line Isolation Monitors — Dimensions in Inches (mm)

LIM Features Less than 35 microampere LIM

hazard current. No interference with medical

equipment. Hybrid design with special phase-

locking circuitry for ultimatestability and repeatability.

Voltage-free SPDT contact for external usage.

LIM overload protection with automatic reset.

Field adjustable 2 or 5 mA response value.

Easy-to-clean ruggedLexan front.

Analog display IZ1490 and IZ1491. Digital display IZ1492 and IZ1493.

Product DescriptionThe Line Isolation Monitor (LIM) detects the total leakage impedance to ground in an AC isolated or ungrounded power system. Based on this information, the maximum Total Hazard Current (THC) is determined.

The LIM is available for operation in 50 or 60 Hz systems with the following AC voltages: 24, 100, 110, 120, 200, 208, 220, 230, 240 and 277V. The LIM requires a separate supply voltage of 120V AC when used with a system voltage 24V. Otherwise, the supply voltage for the LIM is taken from the system to be monitored.

Two separate ground connections are provided for added safety when wiring the LIM into an Isolated Power System. Each ground should be wired individually to the Reference Ground-ing Bus. A break in either connection will cause the LIM to alarm.

Operational InformationThe LIM function is to calculateand display the true maximum value of the Total Hazard Current (THC).The LIM accomplishes this task using a patented technique of measurement.

The THC is displayed either on an ana-log or digital panel meter. Normally, the green LED is “on” and the meter is in the non-alarm or safe green zone. THC levels will increase as additional loads are connected to the system and/or when a line-to-ground fault has suddenly occurred or is slowly devel-oping. There is a visual and audible alarm when the THC exceeds the LIM setting of either 2 or 5 mA. Relay out-put contacts are also available which can be wired into a circuit to trigger an external alarm.

The visual alarm remains on for the duration of the fault. The buzzer can, however, be muted at the discretion of personnel in the vicinity of the LIM. The red LED that is built into the mute switch comes “on” to indicate a muted condition.

A test switch can be activated to check-out the LIM operation. This action creates the equivalent of a fault and causes the LIM to react as if a true fault had occurred in the system. The meter then goes into the red alarm zone, the green LED goes off, the red LED comes on and the buzzer sounds. The opera-tion of this switch does not add to the risk of electric shock within the system in actual use, nor does it include the effect of the line-to-ground stray impedance of the system.

The LIM has provisions for connecting one or more remote stations with or without meter. Similar information and test action is available at these remotes as is provided by the LIM.

7(177.8)

Recessed Molex Connector

View from Back

4.6)01.(10

44-1/4(108.0)(108.0

6 1/86-1/8(155.6)(155 6)

6-1/8(155.6)

4-7/16-7/16(112.7)12.7

22-1/2(63.5)(63.51/8/

(3.2)3.2)



36.0-11January 2003


36


Ref. No. 1323

Table 36.0-10. Technical Data for LIMRated Insulation Voltage 300V

Insulation Class in Accordance with UL 1022Dielectric Voltage-Withstand Test

1500V

Rated Service Rating Continuous Operating

Rated Mains Voltage of VNFrequency Range of VNOperating Range of VNMaximum Power Consumption

24/100/110/120/200/208/220/230/240V AC, Single-Phase50 or 60 Hz (+/- 1%)85% – 110% of Rated Voltage7.5 VA

Measuring CurrentMonitor Hazard Current

Maximum 18 µAMaximum 35 µA

Minimum Internal Impedance at 50/60 Hz 4MΩNominal Response ValueResponse ToleranceResponse RetardationResponse Hysteresis

5 mA Changeable to 2 mA1.8 to 2 mA or 4.6 to 5 mA< 5 sec.15% of Response Value

Output Contact Assemblies

Rated Contact VoltageMake CapacityBreak Capacity

at 250V DC and L/R = 0at 60V DC and L/R = 0at 24V DC and L/R = 0

Switching Life (220V AC/60 Hz)

One Voltage-Free SPDT Contact and one 12V AC,120 mA Remote Indicator Contact250V6A

0.4A0.7A6A2 x 106 Cycles

Operation Mode Continuous

LIM Overload Protection Built-in Thermal Overload with Automatic Reset

Ambient TemperatureWhen Operating

When Stored

10°C – 50°C 50°F – 122°F-20°C – 50°C 10°F – 122°F

Mounting Orientation Any

Connector 15-pin Molex, Type 03-09-2152

Weight Approximately 1.75 Lbs (.8 kg)

Physical DetailsThe LIM is less than 2-1/2 inches (63.5 mm) deep. Cutout required for panel mounting is 4-5/16 x 6-3/16 (+0, -1/32) inches (109.6 x 157.2 mm). Mounting holes are on 4-inch (101.6 mm) and 6-1/2-inch (165.1 mm) centers.

A 15-pin female Molex connector is built into the side of the LIM. A terminal board assembly with cable and 15-pin male Molex connector is available to facilitate field wiring.

A buzzer sound level adjustment, using a 1/8-inch (3.2 mm) Allen head wrench is conveniently accessible through a hole in the top-side of the LIM.

The housing must be opened to change the LIM response value to either 2 or 5 mA.


36.0-12


January 2003


36

Ref. No. 1324

CSA is a registered trademark of the Canadian Standards Association. UL is a federally registered trademark of Underwriters Laboratories Inc. National Electrical Code and NEC are registered trademarks of the National Fire Protection Association, Quincy, Mass.


Documents

Contents Hospital Isolation Equipment - Eatonpub/@electrical/...analog or digital panel meter. A visual and audible alarm occurs when the hazard current exceeds 2 or 5 milliamperes