Specifications

Issue 6 February 2007 405
AC power distribution
A typical AC power-distribution unit for an MCC1 contains:
● Circuit breakers
● Ring generator
● Optional batteries
● Optional battery charger
The power distribution cables carry 120 VAC during normal operation and 144 VDC from
optional batteries if AC power fails. Another cable connects 120-VAC to the battery charger.
The following figures show an AC power-distribution unit and battery charger (J58890CE-2 List
15 or later). The AC power-distribution unit and the battery charger sit at the bottom of some
MCC1s.
AC power-distribution unit (J58890CE-2) (front)
Figure 85: AC power-distribution unit (J58890CE-2) (front)
The AC power-distribution unit contains the following additional components that are not shown
in the figure:
● Electromagnetic interference (EMI) filter
● AC input fuse
● Five circuit breakers, one for each carrier
● 20-A fuses
● A signal connector
● -48 VDC fan power
The optional battery charger sits at the bottom of some MCC1s.
Circuit
breakers
Ring
generator
631DB
power unit
Ring generator
fuse
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