Power Cable Specifications When Using Ac Rectifiers - Nortel Passport 15000 Preparation Manual

152 Chapter 4 Power and grounding preparation
Power cable specifications when using ac rectifiers
241-1501-205 5.2S2
When the power and ground setup of a Passport 15000 or 20000 uses a system
of ac rectifiers as a power source, such an Astec MFA150 power system, the
size of the dc cables between the rectifier and the rear of the breaker interface
panel (BIP) may be different from a rectifier or a dc power source. For
example, the MFA150 without batteries provides up to 50 A, while a dc site
plant with batteries can provide up to 100 A. Refer to "Power architecture"
(page 120).
When the system of ac rectifiers is the MFA150, cable kit AP5C90FJ contains
electrical hardware to connect the MFA150 to the BIP to power one or two
Passport 15000 or 20000 switches. The kit includes:
• 100 m (328 ft) of No. 2 AWG (33.62 mm
the input cables
• for the MFA150, five 1-hole 2 AWG lugs and six 2-hole 5/8-inch lugs
• for the BIP, ten 2-hole 90-degree offset narrow-tongued lugs, which
includes two spares
Although the insulation boots that cover the power input studs on the BIP are
1/0 AWG (53.49 mm
address thinner cables passing through the boots.
When the ac rectifier setup is installed with an optional power-and-ground
assembly, either the polyvalent kit (part number A0834143) or the European
Telecommunications Standards Institutes (ETSI) kit (part number
A0834149), the size of the dc cables between the rectifier and the terminal
blocks of the power-and-ground assembly are calculated according to the
distance between endpoints. The kit also provides the power input cables
between the terminal blocks and the BIP. When connecting the power input
cables to the terminal blocks, bared cable is fastened directly to each block.
For more cable information, refer to "Power cable specifications" (page 143).
With a system of ac rectifiers, the guidelines for voltage drop are the same as
for both the ac and dc methods of cabling except for the Note on
overprotection. Refer to "Allowing for voltage drop over distance"
(page 133).
2
), the connection procedure for cables to the rear studs
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) cable, to be cut equally for