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 TM 5-683/NAVFAC MO-116/AFJMAN 32-1083
FEEDER
BUSWAY
PLUG-IN
BUSWAY
Figure 2-1. Typical busway installation.
vided) and the mechanical means to charge, close
but leaves the control circuits energized (fig 2-2). If
a "test" position is not provided, then complete-
and trip the breaker. This is particularly important
for breakers that normally remain in either the
ly withdraw the circuit breaker from its compart-
ment and use a test coupler to provide control
opened or closed position for long periods of time.
power.
(4) Remove the breaker from its compartment
to a clean maintenance area. Close the compart-
(2) Test for voltage to make sure that all paths
of potential backfeed from control power circuits, as
ment door and cover the breaker cutout to prevent
well as outside sources, are disconnected. This is
access to live parts.
especially important if an external source of control
(5) Check and lubricate all safety rollers and
power is being used for testing.
auxiliary contacts. Check all mechanical clearances
(3) Operate the breaker and check all func-
to ensure they are within manufacturer specified
tions. Use both the electrical means (when pro-
tolerances. Also inspect and lubricate bus stabs and
2-4
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