Nortel Passport 15000, Установка и обслуживание оборудования, Страница: 347 / 874

Chapter 17 Hardware procedures 347
Passport 15000, 20000 Hardware Installation, Maintenance, and Upgrade 5.2S2
Disconnecting a power input cable from a terminal block
Disconnect a power input cable to a terminal block of a polyvalent or an ETSI
power-and-ground assembly from the power source to replace the cable or as
part of replacing the assembly.
Prerequisites
• You must be familiar with “Safety considerations and best practices”
(page 53).
• When disconnecting a power input cable to replace it, you need one of
equal specifications or better. Install the cable in parallel to the existing
cable from the source up to the power-and-ground assembly.
Procedure steps
1 Switch off all breakers or remove all fuses that enable power to that
branch of cable. Put tape over the breakers or fuse openings to indicate
deliberate disablement.
2 Switch off all breakers (press O in) on the BIM that is fed by that cable.
Refer to the figures “Overhead power input cables for the lower shelf
connected to the BIP” (page 337) and “BIMs for specific shelf nodes”
(page 352). Switching a breaker off generates a software alarm. This is
normal during a replacement.
3 Unfasten the large slotted captive screw in the terminal block in which the
cable is connected.
4 Ensure that the power input cable is labelled to enable its appropriate re-
connection or the connection of a replacement cable.
5 Repeat step 1 to step 4 for each other power cable that is to be
disconnected.