Communication Server Large System Installation and Commissioning

Installing AC power Page 79 of 456

Communication Server 1000M and Meridian 1 Large System Installation and Commissioning

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 25

Single column – ground and logic return distribution

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.

AC input

Service

panel

IG or ACEG

120 V

receptacle

Cord or

conduit

208/240 V

receptacle

(30 A L6 - 30

IG - L6 - 30)

Safety ground (#6 AWG, min)

Logic return

(#6 AWG)

AC conduit

553-3154-1

Large System