Nortel DMS-100 Series Maintenance Manual page 119

Grounding
Electrical
compartment
Ground bars
OPAC grounding network
The cabinet ground bar located in the electrical compartment connects to the
OPAC main ground. The following figures illustrate the ground bar
terminations. The operating company provides the ground in agreement
with local utility codes and operating company requirements. The
maximum recommended ground-to-earth resistance is 25 Ω.
Ground bar assembly, on AC bulkhead viewed from AC compartment
Mounting bolt
(cabinet grounding)
Ground from AC
power pedestal
DMS-100 Family OPAC Maintenance Manual XPM12 and up
OPAC maintenance overview 2-25
Electronics compartment
6 AWG wire
Bonded to cabinet wall
Unassigned ground connections
Field installed outside
plant ground
Termination
compartment
Ground bars
Mounting bolt
(cabinet grounding)