Instruction Bulletin
43100-019-01A
October 1996
Replaces
43100-019-01
dated 3/92
Hospital Isolated Power Systems
Isolation Panels
Class 4800
 1995 Square D All Rights Reserved
Hospital Isolated Power Systems—Isolation Panels
Bulletin No. 43100-019-01A
October 1996
Square D Company
3300 Medalist Drive
Oshkosh, WI 54901
ISO-GARD, Square D and
are Registered Trademarks of Square D Company.
 1996 Square D Company, all rights reserved. This bulletin may not be copied in whole or in
part, or transferred to any other media, without the written permission of Square D Company.
Electrical equipment should be serviced only by qualified electrical maintenance personnel.
No responsibility is assumed by Square D for any consequences arising out of the use of
this material.
2
 1996 Square D All Rights Reserved
Bulletin No. 43100-019-01A
October 1996
CONTENTS
Hospital Isolated Power System Panels—Isolation Panels
Table of Contents
SECTION 1—INTRODUCTION .......................................................................................... 1
GENERAL DESCRIPTION .................................................................................................. 1
Backbox Package ......................................................................................................... 1
Interior Package ........................................................................................................... 1
Subpanel .................................................................................................................. 1
Transformers ............................................................................................................. 1
Circuit Breakers ........................................................................................................ 2
Line Isolation Monitors (LIM) .................................................................................... 2
Trim Package ................................................................................................................ 2
Accessory Package ...................................................................................................... 2
SECTION 2—SAFETY PRECAUTIONS ........................................................................... 3
SECTION 3—RECEIVING, HANDLING AND STORAGE ................................................. 3
RECEIVING ......................................................................................................................... 3
HANDLING .......................................................................................................................... 3
STORAGE ........................................................................................................................... 3
SECTION 4—INSTALLATION ........................................................................................... 4
SUPPORT REQUIREMENTS ............................................................................................. 4
PREPARATION AND ASSEMBLY ....................................................................................... 4
Backbox Mounting .................................................................................................... 4–7
Assembly ................................................................................................................ 8–10
TRANSFORMER INSTALLATION ..................................................................................... 11
Vibration Pads ............................................................................................................ 11
Transformer Installation .............................................................................................. 11
Transformer Electrical Connections ........................................................................... 11
ELECTRICAL CONNECTIONS ................................................................................... 12–17
Wire Quality Requirements ........................................................................................ 12
Grounding .................................................................................................................. 12
FINAL INSPECTION AND TESTING ................................................................................ 17
SECTION 5—OPERATION .............................................................................................. 18
SECTION 6—MAINTENANCE ........................................................................................ 19
APPENDIX A—OPTIONAL LIM INDICATOR ALARM ................................................... 20
ALARM INSTALLATION .................................................................................................... 20
Panel-Mounted Indicator Alarm .................................................................................. 20
Remote Indicator Alarm ............................................................................................. 20
ALARM OPERATION ........................................................................................................ 21
APPENDIX B—OPTIONAL EQUIPMENT ....................................................................... 20
 1996 Square D All Rights Reserved
3i
Hospital Isolated Power Systems—Isolation Panels
CONTENTS (cont.)
Bulletin No. 43100-019-01A
October 1996
Figures
1. OR and X-ray Panels—Backbox ..................................................................................... 5
2. ICU/CCU Panel—Backbox .............................................................................................. 6
3. Duplex Panel—Backbox .................................................................................................. 7
4. 3-Phase Panel—Backbox ................................................................................................ 7
5. Dual Output Voltage Panel—Backbox ............................................................................. 7
6. OR and ICU/CCU Panels 3.0 and 5.0 kVA—Assembly ................................................... 8
7. OR and ICU/CCU Panels 7.5 and 10.0 kVA—Assembly ................................................. 8
8. Duplex Panel—Assembly ................................................................................................ 9
9. X-ray Panel—Assembly ................................................................................................... 9
10. 3-Phase Panel—Assembly .......................................................................................... 10
11. Dual Output Voltage Panel—Assembly ....................................................................... 10
12. Vibration Pad Detail ..................................................................................................... 11
13. OR Panel—Electrical Connections .............................................................................. 13
14. ICU/CCU Panel—Electrical Connections .................................................................... 14
15. X-ray Panel—Electrical Connections ........................................................................... 15
16. 3-Phase Panel—Electrical Connections ...................................................................... 16
17. Dual Output Voltage Panel—Electrical Connections ................................................... 17
18. X-ray Panel Secondary Circuit Pushbutton Selectors ................................................. 18
19. IA-1C Remote Indicator Alarm .................................................................................... 20
20. Remote Indicator Alarm Wiring Diagram ..................................................................... 21
ii4
 1996 Square D All Rights Reserved
Bulletin No. 43100-019-01A
October 1996
Hospital Isolated Power System Panels—Isolation Panels
Section 1—Introduction
SECTION 1—INTRODUCTION
This bulletin explains how to install, operate, and maintain Square D isolation
panels for hospital isolated power systems. The panel styles described in this
bulletin include:
• Operating room (OR) panels
• Intensive care unit and coronary care unit (ICU/CCU) panels, which have the
added feature of ground jacks and power receptacles.
• Duplex panels, which have two or more panels in the enclosure.
• Portable X-ray panels that supply power to portable or mobile X-ray units.
• 3-phase panels for specialized equipment such as 3-phase surgical lasers.
• Dual output voltage panels for special applications where the panels can
supply a single operating room with two different output voltages
simultaneously.
This document is for use by qualified electricians. Please refer to National
Electric Code (NEC) Article 517, National Fire Protection Association (NFPA) 99,
and other appropriate national and local codes.
GENERAL DESCRIPTION
Except as noted, the specifications below are standard for the United States.
Call or write Square D for more information about special equipment,
modification, or substitutions. Make sure that all equipment conforms to local
codes and standards.
Backbox Package
The backbox is 14-gauge steel. Flush mounting is standard, but surface mounting
is available on request.
Interior Package
Subpanel
Transformers
The subpanel is a single component, which contains the prewired fixture plate
and a dead front panel.
The transformers for the OR, ICU/CCU, and duplex panels have ratings of 3, 5,
7.5, and 10 kVA. The primary voltage of the transformer can range from 100 to
600 V, depending upon equipment requirements. The secondary voltage of the
transformer can range from 100 to 240 V.
The transformers of the portable X-ray and 3-phase panels have 15 and 25 kVA
ratings. The primary voltage of the transformer ranges from 208 to 600 V. For
single-phase equipment, the secondary voltage can range from 208 to 240 V,
depending on equipment requirements. For 3-phase equipment, the secondary
voltage of the transformer is 208 V.
The 3 and 5 kVA transformer are factory-installed in the OR and ICU/CCU
interiors. For all other models, the transformers are shipped separately and must
be installed at the location. For transformer part numbers, see the Square D Digest
or the Square D handbook 4800HB9301, Hospital Isolated Power Systems.
 1996 Square D All Rights Reserved
1
Hospital Isolated Power Systems—Isolation Panels
Section 1—Introduction
Circuit Breakers
Bulletin No. 43100-019-01A
October 1996
The primary circuit breaker on all panels is sized in accordance with
NFPA 70-1996, Article 450-3(b)(1). The number of installed secondary circuit
breakers varies with the panel style:
• OR, ICU/CCU, and duplex panels have eight factory-installed 20 A secondary
circuit breakers, but are field expandable to 16 circuit breakers.
• 3-phase panels can accommodate up to nine three-pole, 60 A secondary
circuit breakers.
• Portable X-ray panels serve a maximum of eight secondary circuits.
A pushbutton switch in the panel selects which secondary circuit
receives power.
• Dual output voltage panels have eight secondary circuit breakers for the
120 V output voltage and one secondary circuit breaker for the 240 V.
They also have room for one additional 208/240 V secondary circuit breaker,
and the 120 V output voltage panelboard can be field expandable to
16 circuit breakers.
Line Isolation Monitor (LIM)
Each panel comes with one or more ISO-GARD ® line isolation monitors (LIM)
manufactured by Square D. The LIM continuously monitors the impedance of
the total isolated, ungrounded system to ground.
Note: The normal LIM hazard index is 5 milliamperes (mA). However, the
hazard index can be switched to 2 mA to meet CSA certification.
Trim Package
The trim is 14-gauge stainless steel. The front cover has a hinged door with lock
and key. Flush-mounted models have a one inch flange on all sides for covering
uneven edges of the wall opening into which the panel is installed. Flushmounted duplex panels are designed for mounting at the floor level and do not
have a flange on the bottom. Surface-mounted models do not have a flange.
Accessory Package
Optional accessories may be included in the panel design. See Appendix A and B
for information on accessories.
2
 1996 Square D All Rights Reserved
Bulletin No. 43100-019-01A
October 1996
Hospital Isolated Power System Panels—Isolation Panels
Section 2—Safety Precautions
SECTION 2—SAFETY PRECAUTIONS
DANGER
HAZARD OF ELECTRIC SHOCK, BURN, OR EXPLOSION
• Only qualified personnel should install, operate, service, or maintain this
equipment.
• Successful equipment operation depends on proper handling, installation,
and maintenance. Neglecting fundamental installation or maintenance
requirements will result in personal injury and damage to electrical
equipment or other property.
• Before installing the equipment, disconnect all sources of electrical power.
Assume that all circuits are live until they have been completely de-energized,
tested, grounded, and tagged. Consider all sources of power, including the
possibility of backfeeding.
• Before replacing covers or closing doors, carefully inspect the panel area for
tools and objects left in the equipment.
• For safety, have at least two qualified individuals present during installation.
Failure to follow these instructions will result in death or serious injury.
SECTION 3—RECEIVING, HANDLING AND STORAGE
RECEIVING
The backbox may arrive first to allow electrical contractors to begin rough-in
work. Before filing claims for shortages, check the details of the order.
Upon receipt, inspect the equipment. If any damage or rough handling is
evident, file a damage claim with the carrier immediately. Notify the local
Square D field sales office.
HANDLING
Isolated power system panels weigh several hundred pounds. To reduce the risk
of personal injury or equipment damage, use equipment suitable for lifting and
moving heavy loads.
STORAGE
Do not store this equipment in damp or dusty conditions.
 1996 Square D All Rights Reserved
3
Hospital Isolated Power Systems—Isolation Panels
Section 4—Installation
Bulletin No. 43100-019-01A
October 1996
SECTION 4—INSTALLATION
SUPPORT REQUIREMENTS
Before installing the panel, make sure the structural support can bear the weight
of the equipment. Minimum load bearing requirements are as follows:
• OR unit—200 lb (441 kg)
• ICU/CCU unit — 250 lb (551 kg)
• Duplex unit — 495 lb (1091 kg)
• Portable X-ray and 3-phase units—600 lb (1323 kg)
• Dual output voltage unit— 575 lb (1265 kg)
PREPARATION AND
ASSEMBLY
DANGER
HAZARD OF ELECTRIC SHOCK, BURN, OR EXPLOSION
Knockouts for additional circuit breakers are available for X-ray
panels, 3-phase panels, and other applications requiring 208 or 240 V.
Before adding circuit breakers, contact an electrical consultant unless
directed by the consulting/specifying engineer.
Failure to observe this precaution will result in death, severe
personal injury, or equipment damage.
The general steps to install the panel and its components are as follows:
1. Mount the backbox. Refer to figures 1–5 on pages 5–7 for backbox dimensions.
2. Install the interior package into the backbox and any accessories. Refer to
figures 6–11 on pages 8–10.
Note: If the panel is fitted for any accessory, remove the closure plate on the
panel trim to install the accessory.
3. Install the transformer (if it is 7.5 kVA and larger). See Transformer Installation
and Connections on page 11.
3. Make the electrical connections to the loads being served, such as the
receptacles, surgical lights, X-ray film viewer, and so forth. See Electrical
Connections on page 12 and refer to figures 13–17 on pages 13–17.
4. Install the deadfront panel and stainless steel trim panel.
Backbox Mounting
Shaded areas in figures 1–5 show possible space for routing conduit and fittings.
No knockouts or holes for conduit are provided in the backbox. The installer is
responsible for drilling additional holes for non-standard mounting and conduit
entrances. Front and rear backbox dimensions are the same.
On flush-mounted units, the four 9/16 in (14 mm) mounting holes are located in
the backbox, two at the top and two at the bottom. Install the backbox even with
the finished wall or recessed no more than 1/4 inch. Do not allow backbox to
protrude past the finished wall.
On surface-mounted models, all four 9/16 in (14 mm) mounting holes are
located in the rear of the enclosure box.
4
 1996 Square D All Rights Reserved
Bulletin No. 43100-019-01A
October 1996
Hospital Isolated Power System Panels—Isolation Panels
Section 4—Installation
Backbox Mounting (cont.)
5.00
6.00
5.00
127
8.00
24.00
8.00
33.00
35.00
279
35.00
889
889
11.00
Transformer
254
35.00
838
Optional
Accessories
610
10.00
Transformer
152
24.00
203
Optional
Accessories
610
203
6.00
152
127
Circuit Breaker
Panel
889
Circuit Breaker
Panel
Line Isolation
Monitor
Line Isolation
Monitor
Hinged Door with Lock and Key
Hinged Door with Lock and Key
14 Gauge Stainless Steel
7.00
14 Gauge Stainless Steel
7.00
179
179
1.50
1.50
(4) .562 Dia. Holes
14
(2 Top, 2 Bottom
For Mounting)
(4) .562 Dia. Holes
14
(2 Top, 2 Bottom
For Mounting)
22.00
559
24.00
610
3 and 5 kVA
Flush Mounted
3 and 5 kVA
Surface Mounted
5.00
6.00
5.00
127
6.00
127
127
12.00
29.00
12.00
Shaded areas denote
possible conduit entrance
38
Shaded areas denote
possible conduit
entrance
38
29.00
305
737
127
737
305
Optional
Accessories
16.00
Transformer
Transformer
406
40.00
1016
Primary
Breaker
42.00
1067
42.00
42.00
1067
Line Isolation
Monitor
14 Gauge
Stainless Steel
14 Gauge
Stainless Steel
Hinged Door with
Lock and Key
179
7.00
179
1.50
1.50
38
38
(4) .562 Dia. Holes
14
(2 Top, 2 Bottom
For Mounting)
1016
Secondary
Breakers
Secondary
Breakers
7.00
17.00
Primary
Breaker
1067
Line Isolation
Monitor
Hinged Door with Lock and Key
Optional
Accessories
Shaded areas denote
possible conduit entrance
27.00
(4) .562 Dia. Holes
14
(2 Top, 2 Bottom
For Mounting)
686
7.5 through 25 kVA
Flush Mounted
Shaded areas denote
possible conduit entranc
29.00
686
7.5 through 25 kVA
Surface Mounted
Figure 1: OR and X-ray Panels—Backbox
 1996 Square D All Rights Reserved
5
Hospital Isolated Power Systems—Isolation Panels
Section 4—Installation
Bulletin No. 43100-019-01A
October 1996
Backbox
Mounting (cont.)
5.00
5.00
127
127
6.00
6.00
152
24.00
8.00
610
203
1067
44.00
Circuit Breaker Panel
1118
11.00
Transformer
254
44.00
Optional Accessories
610
203
10.00
Transformer
42.00
24.00
8.00
Optional Accessories
152
1118
279
44.00
1118
Circuit Breaker Panel
Line Isolation Monitor
Line Isolation Monitor
Hinged Door with Lock and Key
Hinged Door with Lock and Key
Ground Jacks 30 Amp (6)
Ground Jacks 30 Amp (6)
Power Lock Receptacles 20 Amp
Hospital Use Only (8)
14-Gauge Stainless Steel
Trim Panel
14-Gauge Stainless Steel
Trim Panel
7.00
7.00
178
178
1.50
38
1.50
38
Shaded areas denote
possible conduit entrance
(4) .562 Dia. Holes
14
(2 Top, 2 Bottom for Mounting)
Shaded areas denote
possible conduit entrance
(4) .562 Dia. Holes
14
(2 Top, 2 Bottom For Mounting)
22.00
559
3 and 5 kVA
Flush Mounted
5.00
24.00
610
3 and 5 kVA
Surface Mounted
5.00
127
Power Lock Receptacles 20 Amp
Hospital Use Only (8)
6.00
127
6.00
152
152
29.00
12.00
737
635
Transformer
29.00
12.00
Optional Accessories
Optional Accessories
737
635
16.00
Transformer
406
17.00
432
49.00
51.00
1245
1295
Circuit Breaker Panel
51.00
51.00
1295
1295
Circuit Breaker Panel
Line Isolation Monitor
Line Isolation Monitor
Hinged Door with
Lock and Key
3.00
76
Ground Jacks 30 Amp (6)
Hinged Door With
Lock and Key
4.00
102
Ground Jacks 30 Amp (6)
14 Gauge Stainless Steel
Trim Panel
7.00
178
Power Lock Receptacles
20 Amp Hospital Use Only (8)
14 Gauge Stainless Steel
Panel Trim
7.00
Power Lock Receptacles
20 Amp Hospital Use Only (8)
178
1.50
38
(4) .562 Dia. Holes
14
(2 Top, 2 Bottom For Mounting)
1.50
Shaded areas denote
possible conduit entrance
27.00
686
29.00
737
7.5 through 25 kVA
Surface Mounted
7.5 through 25 kVA
Flush Mounted
Figure 2: ICU/CCU Panel—Backbox
6
Shaded areas denote
possible conduit entrance
38
(4) .562 Dia. Holes
14
(2 Top, 2 Bottom For Mounting)
 1996 Square D All Rights Reserved
Bulletin No. 43100-019-01A
October 1996
Hospital Isolated Power System Panels—Isolation Panels
Section 4—Installation
Backbox
Mounting (cont.)
30.0
762
30.0
762
8.0
203
30.0
12.0
762
305
52.0
72.0
762
52.0
72.0
1321
1829
30.0
1321
1829
Shaded areas
denote possible
conduit entrance
Flush Mounted
3 and 5 kVA
Flush Mounted
7.5 and 10 kVA
Figure 3: Duplex Panel—Backbox
16.0
16.0
406
406
60.0
58.0
1524
1473
Shaded areas
denote possible
conduit entrance
1.5
1.5
38
38
(4) 0.562
14
Dia. Holes For Mounting
2 Top, 2 Bottom
Flush Mounted
15 and 25 kVA
40.0
1016
Surface Mounted
15 and 25 kVA
(4) 0.562
14
Dia. Holes For Mounting
2 Top, 2 Bottom
42.0
1067
Figure 4: 3-Phase Panel—Backbox
6.00
6.00
127
127
34.00
12.00
864
305
36.00
12.00
914
305
43.00
42.00
62.00
64.00
1067
1519
21.00
20.00
533
508
6.00
152
6.00
152
Flush Mounted
1092
1626
6.00
152
6.00
Shaded areas denote
possible conduit
entrance
Surface Mounted
152
Figure 5: Dual Output Voltage Panel—Backbox
 1996 Square D All Rights Reserved
7
Hospital Isolated Power Systems—Isolation Panels
Section 4—Installation
Bulletin No. 43100-019-01A
October 1996
Assembly
Backbox Package
Interior Package
Accessory Package
(Optional)
Trim Package
Trim Hardware
For flush-mounted,
adjust receptacle
module flush with
finished wall surface
On surface-mounted,
adjust receptacle
module flush with the
backbox flange.
Side View
Front View
Figure 6: OR and ICU/CCU Panels 3.0 and 5.0 kVA—Assembly
Backbox Package
Interior Package
Trim Package
Accessory Package
(Optional)
Trim Hardware
Side View
Front View
Figure 7: OR and ICU/CCU Panels 7.5 and 10 kVA —Assembly
8
 1996 Square D All Rights Reserved
Bulletin No. 43100-019-01A
October 1996
Hospital Isolated Power System Panels—Isolation Panels
Section 4—Installation
Assembly (cont.)
Backbox Package
Trim Package
Interior Package
Trim
Hardware
Accessory
Package
(Optional)
Side View
Accessory Package
(Optional)
Front View
Figure 8: Duplex Panel —Assembly
Backbox Package
Interior Package
Trim Package
Accessory Package
(Optional)
Trim Hardware
NAMEPLATE
Side View
Front View
Figure 9: X-ray Panel —Assembly
 1996 Square D All Rights Reserved
9
Hospital Isolated Power Systems—Isolation Panels
Section 4—Installation
Bulletin No. 43100-019-01A
October 1996
Assembly (cont.)
Backbox Package
Interior Package Trim Package
Accessory Package
(Optional)
Trim Hardware
NAMEPLATE
Side View
Front View
Figure 10: 3-Phase Panel—Assembly
Backbox Package
Interior Package
Trim Package
Trim Hardware
Accessory Package
(Optional)
Dead front
panel
For flush-mounted,
adjust receptacle
module flush with
finished wall surface
On surface-mounted,
adjust receptacle
module flush with the
backbox flange.
Side View
Front View
Figure 11: Dual Output Voltage Panel—Assembly
10
 1996 Square D All Rights Reserved
Bulletin No. 43100-019-01A
October 1996
Hospital Isolated Power System Panels—Isolation Panels
Section 4—Installation
TRANSFORMER
INSTALLATION
Small transformers rated 3 or 5 kVA are installed onto the panel interior
assembly at the factory. Transformers rated 7.5 kVA and larger must be installed
into the panel on location.
Vibration Pads
The transformers are equipped with vibration pads to reduce vibration and
dampen sound caused by transformer vibration. Before shipping, transformers
rated at 3 and 5 kVA are securely bolted to the subpanel with four retaining nuts.
After installing the panel and its components, loosen the transformer retaining
nuts to allow the rubber pads to absorb the vibration. If left compressed, the pads
may not dampen the noise.
On larger transformers 7.5 kVA and larger, the vibration pads are not
factory installed.
Bolt
Washer
Transformer
Mounting Bar
Vibration
Pad
Angle
Washer
Lock
Washer
Retaining
Nut
Figure 12: Vibration Pad Detail
Transformer Installation
Transformers that are 7.5 kVA or greater can weigh 150–500 lbs (330–1100 kg),
and therefore require special handling. Depending on the panel design, the
transformers are installed either on the top half or the bottom half of the
backbox. Refer to the approval drawing for the specific location. If on the top,
install the the transformers on the mounting angles with nuts and bolts. If on the
bottom, install the transformers over the studs. Reuse the hardware from the
shipping pallet.
Orient the transformers in the enclosure to allow the leads to extend out from the
front. This makes wiring to the primary circuit breaker and panelboard easier.
Transformer Electrical
Connections
To make electrical connections to the transformer, refer to figures 13–17 on
pages 13–17.
 1996 Square D All Rights Reserved
11
Hospital Isolated Power Systems—Isolation Panels
Section 4—Installation
Bulletin No. 43100-019-01A
October 1996
ELECTRICAL
CONNECTIONS
The electrical connections required at the installation site are the following:
1. Connection of the main power feeder.
2. Connection of the reference ground bus to the ground lug on the terminal board.
3. Connection of the remote indicator alarms to the LIM.
Connect the secondary circuits to the contactors or to the panel board circuit
breakers in the subpanel. The contactor terminals are marked and fitted with a
lug to make connection easier. The consulting engineer specifies the wire size.
The color coding for the secondary circuit is as follows:
Orange—isolated conductor No. 1
Brown—isolated conductor No. 2
Green—grounding ground
Yellow—isolated conductor No. 3 (3-phase)
For specific connections, refer to figures 13–17 on pages 13–17.
Wire Quality
Requirements
Square D recommends using cross-linked polyethylene wire with a dielectric
constant of 3.5 or less. The most widely available wire for this application is lowleakage wire #FR-XLP (VW-1 XHHW-2) from Rome Cable Corporation.
Note: Always specify a dielectric constant of 3.5 or less when purchasing wire.
Avoid wires with a high carbon filler, which produce substantial leakage in an
isolated power system. Make sure the wire is the appropriate size for transformer
and meets local code requirements.
Grounding
DANGER
HAZARD OF ELECTRIC SHOCK, BURN, OR EXPLOSION BECAUSE OF
IMPROPER GROUNDING CONNECTIONS
Isolated power system panels for healthcare facilities are not grounded in the
same manner as many other types of electrical equipment. Before proceeding,
read this section, study the wiring diagram and applicable codes, and thoroughly
understand the special grounding requirements for this type of system.
Failure to observe these precautions will result in death, severe personal
injury, or equipment damage.
Isolated power systems for healthcare facilities have special grounding
requirements to reduce electrical hazards to patients. Note that the reference
grounding point is not the grounded or neutral conductor. The ground bus in the
isolation panel is the reference grounding point for the room as defined by NFPA 70,
Article 517. Use only one conductor to connect the ground bus in the isolation
panel to the ground bar of facility’s main ground system. The main ground
system is the distribution panel that feeds power to the isolation panel. Connect
all green ground conductors from the equipment in the patient care area served
by the isolation panel to the ground bus in the isolation panel.
If more than one isolation panel is serving the area, connect both ground buses
(reference grounding points) together with a large conductor, or see the
consulting engineer’s design, or contact Square D.
To ground transformers that are 7.5 kVA and larger, which are shipped
separately, connect the lead from the electrostatic shield of the transformer to the
ground bus in the isolation panel.
12
 1996 Square D All Rights Reserved
Bulletin No. 43100-019-01A
October 1996
Hospital Isolated Power System Panels—Isolation Panels
Section 4—Installation
ELECTRICAL CONNECTIONS
(cont.)
DANGER
HAZARD OF ELECTRIC SHOCK, BURN, OR EXPLOSION
• Turn off all sources of power before beginning.
• Do not use wire pulling lubricant of any type on the secondary circuits.
• Conduit must be clean and dry.
• Maintain identical phasing throughout the installation.
Failure to observe these precautions will result in death, severe personal
injury, or equipment damage.
(Space for 15,6-24 AWG including 1 Lug For 1/0)
Ground Bus
Primary Main
Circuit Breaker
L1
L2
Electrostatic Shield
L3
H1
Primary
H2
Ground
X1
X2
Secondary
RS-232
Test
Meter
LIM Common
12V Common
1
12V Hazard
2
12V Safe
3
K1 Safe
K1 Common
Remote
Indicator
Alarm
K1 Hazard
LIM Terminal Board
Figure 13: OR Panel—Electrical Connections
 1996 Square D All Rights Reserved
13
Hospital Isolated Power Systems—Isolation Panels
Section 4—Installation
Bulletin No. 43100-019-01A
October 1996
ELECTRICAL CONNECTIONS
(cont.)
(Space for 15,6-24 AWG including 1 Lug For 1/0)
Ground Bus
L1
Primary Main
Circuit Breaker
L2
H1
Primary
L3
H2
Electrostatic Shield
Ground
X1
Secondary
X2
RS-232
Test
Meter
LIM Common
12V Common
1
12V Hazard
2
12V Safe
3
K1 Safe
K1 Common
K1 Hazard
LIM Terminal Board
Remote Indicator Alarm
Figure 14: ICU/ CCU Panel—Electrical Connections
14
 1996 Square D All Rights Reserved
Bulletin No. 43100-019-01A
October 1996
Hospital Isolated Power System Panels—Isolation Panels
Section 4—Installation
ELECTRICAL CONNECTIONS
(cont.)
L1
L2
L3
Ground
RS-232
Ground Bus
(Space for 15,6-24 AWG
including 1 Lug For 1/0)
Test
Meter
Primary Main
Circuit Breaker
LIM Common
Circuit Breaker
1 AMP
H1
Primary
12V Common
1
12V Hazard
2
12V Safe
3
H2
K1 Safe
Control Transformer
X1 Secondary
X2
Electrostatic
Shield
K1 Common
K1 Hazard
LIM Terminal Board
Secondary
Circuit Breaker
A
AX1
AX2
Customer Load
Connections
8-Station Interlock
Switch W/Off Position
D3
D2
D1
C3
C2
C1
B3
B2
B1
A3
A2
A1
Remote
Indicator Alarms
A, B, C, D
Station “A” shown; other stations wired similarly
Note: Maximum of 8 outlets
Do not exceed a length of 150 Feet (45.72 Meters) for branch circuit
For single-phase X-ray panels, connect the secondary circuits to the contactors in
the subpanel. The contactors are marked and fitted with a lug.
Figure 15: X-ray Panel—Electrical Connections
 1996 Square D All Rights Reserved
15
Hospital Isolated Power Systems—Isolation Panels
Section 4—Installation
Bulletin No. 43100-019-01A
October 1996
ELECTRICAL CONNECTIONS
(cont.)
Incoming Lines
(Space for 15,6-24 AWG including 1 Lug For 1/0)
Ground Bus
L1
Primary Main
Circuit Protection
L2
L3
Ground
Electrostatic
Shield
RS-232
(not grounded) X0
Test
X1
Meter
X2
X3
LIM Common
12V Common
1
12V Hazard
2
12V Safe
3
K1 Safe
K1 Common
K1 Hazard
LIM Terminal Board
Note:
Use a 4-wire system to supply the primary.
For 3-phase panels, connect the secondary circuits to the secondary branch circuit breakers.
Figure 16: 3-Phase Panel—Electrical Connections
16
 1996 Square D All Rights Reserved
Bulletin No. 43100-019-01A
October 1996
Hospital Isolated Power System Panels—Isolation Panels
Section 4—Installation
ELECTRICAL CONNECTIONS
(cont.)
120 V Circuit
Ground Bus
Primary Main
Circuit Breaker
(Space for 15,6-24 AWG including 1 Lug For 1/0)
L1
L2
L3
Ground
RS-232
Test
Meter
LIM Common
12V Common
12V Hazard
12V Safe
K1 Safe
K1 Common
K1 Hazard
Primary
Electrostatic Shield
H2
H1
Secondary
X1
X2 X3
X4
Secondary
Main
LIM Terminal
Board
Panel is field expandable to 16 secondary
branch circuit breakers (QO220)
208 V Circuit
To Ground Bus
Secondary
Main
Panel is field
expandable to two
secondary branch
circuit breakers (QO)
L1
L2
L3
Ground
RS-232
Test
Meter
LIM Common
12V Common
12V Hazard
12V Safe
K1 Safe
K1 Common
K1 Hazard
LIM Terminal Board
To Ground Bus
Figure 17: Dual Output Voltage Panel—Electrical Connections
FINAL INSPECTION
AND TESTING
NFPA 99-1996 requires that isolated power systems be tested in accordance with
3-3.3.4.2 Isolated Power Systems, 3-3.3.2.1 Grounding Systems in Patient Care
Areas, 3-3.2.2.2 Impedance of Isolated Wiring, and 3-6.4.2 Record Keeping.
A Square D field service representative is available to perform all the tests
required by NFPA 99. Contact your local field office to order this service.
 1996 Square D All Rights Reserved
17
Hospital Isolated Power Systems—Isolation Panels
Section 5—Operation
Bulletin No. 43100-019-01A
October 1996
SECTION 5—OPERATION
Operation of the line isolation monitor (LIM) is described in the instruction
bulletin shipped with the LIM.
The X-ray isolation panel has a secondary circuit breaker that is connected to a
maximum eight branch circuits. Only one secondary circuit can receive power at
a time. The pushbuttons used to select a secondary circuit are located on the
X-ray panel as shown in figure 18, or located in a convenient remote station such
as a nurses station.
To select a secondary circuit, press the pushbutton for that circuit. The red
pushbutton at the bottom of the column clears all secondary circuits. No power
will be delivered to a secondary circuit until the secondary breaker is closed.
Pushbutton
Selectors
Figure 18: X-ray Panel Secondary Circuit Pushbutton Selectors
18
 1996 Square D All Rights Reserved
Bulletin No. 43100-019-01A
October 1996
Hospital Isolated Power System Panels—Isolation Panels
Section 6—Maintenance
SECTION 6—MAINTENANCE
Conduct periodic testing in accordance with chapter 3 of NFPA 99 and any
applicable local codes. Call the local Square D field office to obtain the services
of a Square D factory technician.
The only parts necessary to stock are the fuses for the Square D line isolation
monitor and the lamps for the indicator alarms (see Appendix A), as follows:
• Wickmann type TR5-T, 250 mA fuses (Square D part number 25499-12821).
• Chicago Miniature No. 382 lamps for the HAZARD and SILENCE indicators.
• The SAFE LED indicator light is Starled part number MF636CC5-12VAC/40
(Square D part number 43133-143-01).
Note: To return the LIM to the factory for any reason, first obtain an
authorization and a return material number from the local Square D field office.
Pack the LIM carefully to avoid shipping damages.
 1996 Square D All Rights Reserved
19
Hospital Isolated Power Systems—Isolation Panels
Appendix A—Optional LIM Indicator Alarm
Bulletin No. 43100-019-01A
October 1996
APPENDIX A—OPTIONAL LIM INDICATOR ALARM
Panel-mounted indicator alarms are optional accessories that indicate the
condition of the line isolation monitor (LIM). Three models are available:
ORIC-A, ORIC-AC, and ORIC-A5C. All three models have an audible alarm and
indicator lights. The ORIC-AC has the added feature of a 2 mA microammeter
and ORIC-A5C includes the 5 mA microammeter.
The remote indicator alarm (catalog number IA-1C) is mounted on a two-gang
faceplate. No backbox is provided with this unit; however, a two-gang deep
masonry box is available from your local Square D distributor.
3-7/8
4-5/8
3-13/16
105.2
117.3
96.8
3-9/16
90.4
4-5/8
117.3
3-13/16
96.8
3-9/32
83.5
Indicator
Lights
1-13/16
Two-Gang Box (not supplied)
46
(4) 3/16 Dia. Holes for Mounting
4.6
Figure 19: IA-1C Remote Indicator Alarm (mounted in separate two-gang masonry box)
ALARM INSTALLATION
The indicator alarm terminal block is connected directly to the LIM terminal
board. Use #16 or #18 TW stranded insulated wire for all remote alarm
connections. Because the circuits are low voltage, the wires do not contribute
leakage current to the system and low-leakage wire is not needed. However,
600 V insulation is required for these wires.
The terminal board of the ISO-GARD LIM has a set of normally open and
normally closed dry contacts. The contact notation on the terminal board
indicates their position in the safe condition.
Panel-Mounted Indicator Alarm
Connect the terminals labeled 1, 2, 3, Meter, and LIM Ground on the indicator
alarm terminal block to the corresponding terminals on the ISO-GARD LIM
terminal board.
Note: Terminals labeled Meter and LIM Ground are not used on all units.
Remote Indicator Alarm
On the terminal block of the remote indicator alarm, locate terminals
1, 2, and 3. Connect those terminals to the terminal block points 1, 2, and 3 on the
ISO-GARD LIM terminal board in the isolation panel. Refer to figure 20 on
page 21.
When using more than one indicator alarm, wire the alarms in parallel, except
for the remote meters. Wire the remote meters in series.
20
 1996 Square D All Rights Reserved
Bulletin No. 43100-019-01A
October 1996
Hospital Isolated Power System Panels—Isolation Panels
Appendix A—Optional LIM Indicator Alarm
ALARM OPERATION
SAFE Indication
The green SAFE indicator light is on whenever the LIM to which it is connected
is energized and operating normally.
HAZARD Indication
When a fault occurs, the green SAFE indicator light goes out and the red
HAZARD indicator light comes on. The audible alarm also activates. When the
fault is corrected, the red HAZARD indicator light goes out, the audible alarm
silences, and the green SAFE indicator comes back on automatically. The
indicator alarm is ready to indicate the next fault.
Alarm Silencing
To silence the alarm during a fault, press the SAFE/SILENCE pushbutton. The
amber SILENCE indicator light comes on. The red HAZARD indicator light
remains on until the fault is corrected.
Notes:
1. Connector Pin Functions:
1. L1 Input Vac
2. L2 Input Vac
3. L3 Input Vac
4. Ground
5. Blank
6. RS-232
7. Test
8. Meter +
9. LIM Common (Meter –)
10. 12 Vac Common
11. 12 Vac Hazard
12. 12 Vac Safe
13. K1 Safe
14. K1 Common
15. K1 Hazard
To Isolation
Transformer
Secondary
2. LIM internal power supply
provides 12 Vac (5 VA max.)
to remote indicator alarms.
Square D indicator alarm (catalog
# IA-1C or # M5-IAI) is recommended.
3. Remote indicator alarms requiring
12 VAC at more than 5VA, or requiring
voltage other than 12Vac, can be
powered by an independent power
supply connected as shown and
switched by LIM relay K1 contacts
(1.5 A at 120 Vac max.)
{
Line Isolation Monitor
Not Used on Single Phase
{
Power Source
15-Pin
Connector
Line Isolation Monitor
Terminal Board
Orange
Safe
Remote
Indicator Alarm
Com
See Note 3
Hazard
5
Remote Meter
0
–
10
To
Ground
Bus
+
Com
Remote
Safe
Indicator Alarm
Hazard
See Note 2
Test
L1
L2
L3
Ground
RS-232
Test
Meter
LIM Common
12V Common 1
12V Hazard 2
3
12V Safe
K1 Safe
K1 Common
K1 Hazard
Brown
Yellow
Green
Black
Blue
Red
White
White
Purple
White/Black
White/Red
White/Violet
Gray
Figure 20: Remote Indicator Alarm Wiring Diagram
 1996 Square D All Rights Reserved
21
Hospital Isolated Power Systems—Isolation Panels
Appendix B—Optional Equipment
Bulletin No. 43100-019-01A
October 1996
APPENDIX B—OPTIONAL EQUIPMENT
Additional optional equipment is available, including the following:
• X-ray receptacles with indicator alarm
• Remote X-ray supervisory modules
• Power/ground modules
• Master grounding station module
• Ground cord assemblies
• Digital clocks, timers and accessories
For further details, see the Square D Digest or Handbook 4800HB9301,
“Hospital Isolated Power Systems.”
22
 1996 Square D All Rights Reserved
43100-019-01A October 1996 Printed in USA
Replaces Bulletin No. 43100-019-01 dated 3/92
 1996 Square D All Rights Reserved