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37
Operation
01.4IB.51000C
f. Roll the circuit breaker in the
compartment until the racking crank
arms make contact with the vertical
slots in the compartment. The
anti-rollout latch on the lower right side
of the circuit breaker will engage the
block in the compartment, preventing
accidental removal of the circuit breaker
from the compartment.
Note:
This is the disconnected position.
g. Raise the tray of the lift truck to clear the
front edge of the compartment, release
the lift truck brake and move the truck
away from the compartment. Lower the
tray and return the truck to its storage
point.
For removal of the circuit breaker, refer to the
applicable circuit breaker instruction bulletin.
Note:
An alternate lift truck may be used for
a switchgear line-up that has an aisle
space as narrow as 60 inches.
This is a two (2) person job. Do not attempt to
perform this procedure alone, as it may result
in injury to the user, damage to the circuit
breaker, or damage to the lift truck.
!
CAUTION
When removing the circuit breaker from the
lift truck, hold the lift truck firmly in place to
prevent the truck from rolling away from the
circuit breaker.
!
CAUTION
c. r
AckInG
m
echAnISm
The racking mechanism consists of two slotted
cam plates mounted on each side of the
compartment (Figure 36, c) and the racking
mechanism on the circuit breaker. The crank
arm rollers at the ends of the racking crank
arms of the circuit breaker will engage the
cam plates in the compartment, and the act of
moving the circuit breaker from one position
to another can be performed. The procedures
that move the circuit breaker from one position
to another are known as “standard racking”,
“closed door racking”, “through door racking”,
and “power racking”. Closed door racking,
through door racking, and power racking are
the three optional methods for racking the
circuit breaker into the compartment. All three
racking methods incorporate a torque limiting
device which prevents damage to the racking
mechanism. Refer to appropriate instructions
for PowlVac® Vacuum Circuit Breakers,
including any applicable supplement(s), for
a further description of the full operating
instructions for this racking mechanism.
