Allowing For Voltage Drop Over Distance - Nortel Passport 15000 Preparation Manual

• grounding the Passport 15000 or 20000 to the CPE or the CO ground
window to the NEBS 2000 frame
• if present, grounding the MFA150 power system to the same ground
window as the Passport 15000 or 20000
• adding a pair of breaker interface modules (BIMs) to the BIP
• adding the power distribution cables from the BIP to a second shelf and
to its cooling unit (already pre-wired in NTQS10)
Before installing the power and ground cables for a Passport 15000 or 20000,
observe the following information:
• "Allowing for voltage drop over distance" (page 133)
• "About restricted and non-restricted sites" (page 135)
• "Labeling the power feeds in CPE or a CO" (page 136)
• "Grounding the frame in CPE or a CO" (page 138)
• "Grounding when not using a NEBS 2000 frame" (page 141)
• "Grounding when using ac rectifiers as a power source" (page 141)
• "Prerequisites to installing dc power input cables" (page 141)

Allowing for voltage drop over distance

As the distance from the power source to the cable connections to the BIP
increases, the voltage drops on the feeds. The gauge of wire must be increased
according to the distance to the connection so that exceeding the allowable
voltage drop is prevented.
Passport 15000, 20000 Site Requirements and Preparation Guide
Chapter 4 Power and grounding preparation 133
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.
5.2S2