Power Cable Specifications For A Partially Provisioned Shelf - Nortel Passport 15000 Preparation Manual

146 Chapter 4 Power and grounding preparation
Power cable specifications for a partially provisioned shelf
241-1501-205 5.2S2
CAUTION
Risk of damage to equipment 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.
A partially provisioned shelf means some card or module slots are empty, that
is, covered by a filler (blank). The cable specifications for the input power
cables terminating at the breaker interface panel (BIP) can be less than the
recommended 1/0 AWG (53.49 mm
Passport 15000 or 20000 switch.
The operating company must provide the power cables up to the BIP. The
cable size between the BIP and the power plant or the BIP and a branch cable
must be determined from the power consumption of your shelf. To calculate
your minimum power consumption, and accommodate the addition of
powered parts after the initial installation, see "Power distribution and
consumption" (page 125).
At the rear of the BIP, each input power connection has two studs to ensure a
safe installation of the power cables. The top stud of each pair carries the
power. The bottom stud prevents rotation of the lug from the weight of the
power cable. With secure fastening of a 90-degree (right-angled) 2-hole lug,
arcing and rotation are prevented.
At the rear of the BIP, each A and B feed connection is identified as positive
(+) for the battery return or negative (-) for the battery (-48 V/-60 V dc). Each
connection is also provided with an insulating boot covering a 90-degree
offset narrow-tongued 2-hole lug intended for the 1/0 AWG flexible cable.
When using a gauge of less than 1/0 AWG cable, you must replace the
provided lugs with ones that have an appropriately sized lug barrel with the
same 2-hole size and spacing on a 90-degree offset narrow-tongued lug. The
original insulation boots are used for any cable size less than 1/0 AWG.
2
) cables for a partially provisioned