Communication Server Large System Installation and Commissioning

Page 84 of 456 Installing AC power
NN43021-310 Standard 02.01 December 2007
5 Place a warning tag on the connection at the ground source. The warning
tag should read WARNING—TELEPHONE SYSTEM GROUND
CONNECTION—DO NOT DISCONNECT.
6 Using a volt/ohm meter, measure the resistance between the ground pin
on the power plug and the ground terminal on the power outlet.
7 The resistance should be 0 ohms. If the resistance is greater than
0.5 ohms, check the power outlet ground and safety ground/protective
earth connections.
8 Remove the PDU field wiring access plate.
9 Connect the logic return wire.
Starting at the LRE, connect a #8 AWG wire and route it to the column and
up or down the I/O channel area, as appropriate. Then route the wire
through the conduit hole in the pedestal to LRTN on the field wiring block
(see Figure 30).
Figure 30
Logic return connection for each column
10 Replace the PDU field wiring access plate.
End of Procedure
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MAIN
CIRCUIT
BREAKER
ON ON
ON
553-8996
A
TB1
L1
L2
Gnd
LR
PDU
8D53CB