Chapter 3 — System and site requirements

Page 53 of 332

 

 

Grounding method

CAUTION

To prevent ground loops, power all chassis from the same dedicated power panel. Ground all Main Chassis to the power panel through the grounding block. Ground the Chassis Expander to the Main Chassis.

The method of grounding used for the Option 11C Mini depends on whether the same service panel powers all chassis.

The following three grounding scenarios are possible:

1A system with one chassis

2A system with more than one chassis, powered by the same service panel

3A system with more than one chassis, powered by different service panels

A system with one chassis or multiple chassis powered by one service panel

For each Main Chassis, connect a #6 AWG (#40 Metric Wire Gauge) ground wire from the chassis to the NTBK80 grounding block. See Table 10 on page 49 for grounding wire requirements specific to some areas. Connect the grounding block to a ground source (the ground bus in the AC power service panel).

Consider the Main Chassis and the Chassis Expander as the same ground. Jumper the ground wire from the Chassis Expander to the Main Chassis and then back to the grounding block.

Option 11C Mini Planning and Installation Guide

Page 53
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Nortel Networks Option 11C Mini manual Grounding method