Nortel Meridian 1 option 11C Planning And Installation Manual page 114

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For each system cabinet in collocated multi-cabinet situations, a #6 AWG
(#40 Metric Wire Gauge) ground wire is connected from the cabinet to an
NTBK80 ground bar. If any cabinet cannot be powered from the same service
panel, it must be grounded separate from the others back to the service panel
that supplies it.
The following procedure describes how to ground Option 11C cabinets.
Repeat the steps for each cabinet installed in the system.
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Power should never be connected to a cabinet that is not properly
grounded.
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Backup power should never be connected to a cabinet that is not
properly grounded.
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