About Restricted And Non-Restricted Sites; Table 22 Power Feed Sizes - Nortel Passport 15000 Preparation Manual

With a Passport 20000, the breakers to the shelves on the breaker interface
panel (BIP) increase from 20 A to 25 A. Apply the same criteria for voltage
drop, cable size, and cable specification as a regular Passport 15000 with the
20 A breakers.
Table 22
Power feed sizes
Cable size
1 (42.41 mm
1/0 (53.49 mm
2/0 (67.43 mm
see Note
4/0 (107.2 mm
see Note
Note: The power cables being terminated at the BIP input studs must be up
to No. 1/0 AWG. Using larger cables up to the BIP requires C-tapping by an
appropriate size less than or equal to 1/0 AWG at the BIP.

About restricted and non-restricted sites

A Passport 15000 or 20000 that is installed in a non-restricted access
environment (as with CPE, typically) requires the use of conduit for power
cables. The conduit that is passed into the bottom of the frame must be metal,
for example, electrical metallic tubing (EMT). To accommodate conduit
while maintaining protection from fire, the base of the NEBS 2000 frame has
two 2-inch conduit knockout disks. When using conduit for the installation,
Nortel Networks recommends using 2-inch metal conduit for power cables
going to the BIP. For overhead conduit, stop the installation at the conduit box
above the frame. (The PEC for the conduit box is NTHR78.) According to the
CE Code Handbook and the National Electric Code, 2-inch EMT conduit can
house up to four No. 1/0 AWG cables. For under-floor conduit, stop the
conduit at the plate in the bottom of the frame. The installations involving
conduit are described in 241-1501-240 Passport 15000, 20000 Hardware
Installation, Maintenance and Upgrade, the chapter on installing power and
ground cables.
Passport 15000, 20000 Site Requirements and Preparation Guide
Chapter 4 Power and grounding preparation 135
maximum distance for
1 V dc voltage drop
2
) 48.5 ft (15.9 m)
2
) 61.3 ft (20.1 m)
2
) 77.0 ft (25.3 m)
2
) 97.3 ft (31.9 m)
maximum distance for
1.75 V dc voltage drop
84.8 ft (27.8 m)
107.2 ft (35.2 m)
134.9 ft (44.2 m)
170.4 ft (51.9 m)
5.2S2