Nortel Meridian 1 Planning, Installation And Operating Instructions page 53

Page 34 of 536 Chapter 3 — System and site requirements
Figure 5
Typical hardwired Isolation Transformer wiring plan
Note 1
Shared
Note 5
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 tieing 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 system 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 Transformer primary wires must be in conduit. Wiring to receptacles must be in conduit unless
they are mounted on the transformer case.
5 Connection may be made by metallic conduit. Additional copper conductor recommended.
6 Minimum AWG #6 (metric #40) insulated copper conductor connected to FGND lug on the cabinet.
Route separately from AC power cable.
7 Separate breaker required for each 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.
8 Connect secondary neutral (X0) to system SPG.
553-3121-210 Standard 3.0
•
Note 4
January 1999
Isolation
Note 7
Transformer
• •
•
Note 8
• •
Note 2
Note 6
Note 4
120V IG
Receptacle
240V IG
Receptacle
System
Cabinet
•
Gnd Lug