Nortel Networks 1000M warranty Single column ground and logic return distribution, Large System

Installing AC power Page 79 of 456

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

AC input

Large System	Service
	panel

Cord or

conduit

208/240 V

receptacle (30 A L6 - 30

or

IG - L6 - 30)

120 V receptacle

IG or ACEG

Logic return

(#6 AWG)

Safety ground (#6 AWG, min)

AC conduit

553-3154-1

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.

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