Grounding Method - Nortel Meridian 1 Option 11C Planning And Installation Manual

Ground bus isolation
It is permitted in the USA under the exception to article 384-20 in the NEC
to isolate a panel's ground bus from the housing, provided the panel
concerned is not at the main service entrance. This is also permitted in some
Canadian locations. For more information on ground bus isolation, refer to
local electrical codes.
Do not isolate the ground bus from the housing unless it is specifically
permitted by local electrical codes. Work inside electrical panels
should only be performed by qualified electricians. Do not attempt to
remove bonding conductors without approval from qualified
personnel.
Ground conductors between supply panels must be routed through the
same conduit as the supply conductors. This is a safety requirement of
both the NEC and CEC.

Grounding method

In order to prevent ground loops, it is recommended that cabinets be
powered from the same dedicated power panel, and that all cabinets
are grounded to the power panel through the grounding bar.
The method of grounding used for the Option 11C depends on whether all
cabinets are powered by the same service panel.
System and site requirements Page 41 of 408
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Option 11C Planning and Installation Guide