Nortel Passport 15000 Hardware Installation And Maintenance page 833

ladder must meet your local electrical codes, especially for supporting the
weight of 4 or 8 power input cables.
4 From the ladder or the conduit box, route and align the appropriate
positive (+) and negative (-) cables with the labelled studs as indicated by
the figure "Overhead power input cables for the lower shelf connected to
the BIP" (page 834). Permanently label each cable. Place the label so it
will be easily read and traced to termination after all cables are fastened
in a cluster along the strain relief bar.
5 Dress the power cable above the BIP so that it remains aligned.
6 Cut the cable at about 38 cm (15 in.) below the strain relief bar, wrap the
end with electrical tape, and leave it hanging.
7 Repeat the previous two steps for the other 3 or 7 power cables. Install
them 1 at a time, end to end, from right to left across the rear of the BIP.
(The bottom switch is powered from the studs on the left half of the rear
of the BIP.)
Passport 15000, 20000 Hardware Installation, Maintenance, and Upgrade
Chapter 17 Hardware procedures 833
CAUTION
Risk of equipment damage by reversed polarity
Use the plus (+) and minus (-) symbols on the rear of the
breaker interface panel (BIP) to ensure that the polarity of
each A and B battery (-48/-60 V dc) and battery return for
the input power feeds is correct. When powering up the
BIP, reversed polarity will damage circuits inside it.
5.2S2