Safety Ground/Protective Earth And Logic Return Wiring - Nortel Meridian 1 Manual

Page 36 of 500 Installing AC power

Safety ground/protective earth and logic return wiring

553-3001-210 Standard 14.00 June 1999
A separate safety ground/protective earth connection is required. The safety
ground/protective earth wire must be #6 AWG or larger and must connect the
pedestal to the single-point ground (SPG) in the service panel. The
single-point ground can be an isolated ground (IG) bus or AC equipment
ground (ACEG) bus in the service panel or transformer. Figures 18, 19, and
20 show an ACEG as the single-point ground.
Depending on the distances between columns, the location of the service
panel, and the availability of panel SPG connection points, safety
ground/protective earth wiring can be daisy-chained or run independently
from each column to the service panel. Figures 19 and 20 show safety
ground/protective earth wiring in daisy-chain configurations.
Note: Refer to Meridian 1 installation planning (553-3001-120) for a
complete description of approved ground sources and methods. Insulated
ground wire must be used for system grounding.
Multiple-column systems use a logic return equalizer (LRE) as the point
where the logic return wires from different columns are consolidated before
connecting to the single-point ground. The NT6D5304 small LRE (usually
used with AC power systems) is available from Nortel Networks.