Conduit Requirements - Nortel Meridian 1 Option 11C Planning And Installation Manual

Page 42 of 408 System and site requirements

Conduit requirements

553-3021-210 Standard 7.00
Three grounding scenarios are possible:
• A single-cabinet system
• A two- to five-cabinet system powered by the same service panel
• A two- to five-cabinet system powered by different service panels.
Single-cabinet system or cabinets powered by one service panel
For each system cabinet, a #6 AWG (#40 Metric Wire Gauge) ground wire is
connected from the cabinet to the NTBK80 ground bar provided. The ground
bar, in turn, is connected to a ground source (the ground bus in the AC power
service panel) and the expansion cabinets.
Cabinets powered by different service panels
For each system cabinet, a #6 AWG (#40 Metric Wire Gauge) ground wire is
connected from the cabinet to the NTBK80 ground bar provided. If any
cabinet cannot be powered from the same service panel, then it must be
grounded separate from the others back to the service panel that supplies it.
Note: A separately grounded cabinet is grounded the same as a
single-cabinet system.
Conductive conduit linking panels and equipment are legal for use as a
grounding network in most countries. It is recommended that properly sized,
insulated copper conductors routed inside conduit for all Option 11C system
ground paths be used whenever possible. A ground link dependent on conduit
may compromise or defeat the improvements made by installing dedicated
panels and transformers. Here are the reasons why:
• Conduit links may be separated by personnel servicing unrelated
equipment. If such a separation occurs anywhere between the
Option 11C system and the building ground reference, the conduit is
incapable of providing a ground path. This is a hazardous situation.
January 2002