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Multiple-column systems use an insulated ground bus as the point where the
logic return wires from different columns are consolidated before connecting
to the single-point ground.
Figure 28
Single column – ground and logic return distribution
Cord or
conduit
208/240 V
receptacle
(30 A L6 - 30
or
IG - L6 - 30)
Note: In an isolated ground system, the dedicated isolated ground bus
bar in the service panel serves as the ground window. It is used for all AC
safety grounds and logic returns. It also accommodates a conductor that
references the (+) battery bus in DC systems.
Installing AC power
Large System
receptacle
IG or ACEG
Safety ground (#6 AWG, min)
Large System Installation and Commissioning
Page 87 of 436
AC input
Service
panel
120 V
Logic return
(#6 AWG)
AC conduit
553-3154-1
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