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Figure 7
Typical pluggable cord Isolation Transformer wiring plan
Note 1
Shared
Panel
Neutral Bus
Gnd Bus
Note 3
Notes:
1
Power source is site dependent. It may be from a shared panel or transformer. Wiring may vary
accordingly. Wiring to panel must be housed in conduit.
2
Make SPG at the transformer secondary. If the transformer secondary has no isolated secondary
ground lug, make SPG by connecting all system ground lines to the chassis lug on the transformer
case. An insulated ground connection must be made between the SPG and a known building ground
reference, as per Note 3.
3
Terminate the Option 11 SPG insulated ground conductor as near as possible to the main building
ground reference. Isolate the ground bus from panel housing if permitted by local codes. Conductor
should be minimum AWG #6 (metric #40) at all points.
4
Wiring to receptacles must be in conduit unless they are mounted on the transformer case.
5
Connection can be made by metallic conduit. Additional copper conductor recommended.
6
Minimum AWG #6 (metric #40) insulated copper conductor connected to FGND lug on the Option 11
cabinet. Route separately from AC power cable.
7
Separate breaker required for each Option 11 Main cabinet. Breakers must be mounted on transformer
if the receptacles are. If they are in a panel served by the transformer secondary, all connections
between the receptacles and transformer must be in conduit. The Main Chassis and the Chassis
Expander can coexist on the same breaker.
8
Connect secondary neutral (X0) to system SPG.
9
Conduit required.
Chapter 3 — System and site requirements
Note 5
Note 9
Isolation
Note 7
Transformer
••
•
•
Note 8
•
•
Note 2
Note 6
Option 11C Mini
Page 61 of 332
Note 4
120V IG
Receptacle
240V IG
Receptacle
Option 11
Cabinet
•
Gnd Lug
553-8322.EPS
Planning and Installation Guide
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