Nortel Passport 7400, Hardware Installation, Maintenance, And Troubleshooting, Page: 384 / 438

384 Chapter 37 Hardware procedures
241-7401-240 5.2S1
Removing power cables
Remove power cables so that you can replace faulty cables or if you need to
do so as part of another maintenance task.
Prerequisites
Procedure steps
1 Set the power switch on the power supply serviced by the cable you want
to remove to the standby position. See the figure “Unlocked power supply
with power switch in the standby position” (page 355), “5-slot Passport
switch power supply” (page 341), or “3-slot Passport power switch”
(page 314).
2 At the power distribution panel, turn off the circuit breaker for the outlet
that supplies power to the cable you want to remove. Ensure that the
outlet is void of primary power.
3 If you are removing a dc cable, disconnect the cables from the disconnect
device.
or
If you are removing an ac cable, unplug the cable from the power outlet.
4 If you are removing a cable from a 3-slot Passport switch, remove the
plastic cover from the terminal block.
5 If you are removing a dc cable, disconnect the appropriate -48/60 V dc
and return wire lugs from the terminal block at the rear of the shelf
assembly. See the figures “16-slot Passport switch dc power cables”
(page 274), “5-slot Passport switch dc power cables” (page 271), or “3-
slot Passport switch dc power cables” (page 269).
or
If you are removing an ac cable, unplug the cable from the power
connector on the power input panel on the rear of the switch.
CAUTION
Risk of service loss
If a switch does not have redundant power, remove the
switch from service before removing a power cable or
power supply. For information about minimum and
redundant power configurations, see 241-7401-200
Passport 7400 Hardware Description.