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28
Installation
01.4IB.77000B
PowlVac-ND® Vacuum Circuit Breaker
6) Racking Mechanism Check
The closed door racking design racking
mechanism may be checked outside the
circuit breaker compartment by inserting
the secondary disconnect override device
into the secondary disconnect receptacle.
Insert the racking handle onto the
racking drive shaft extension. The racking
crank arms at the sides of the circuit
breaker should be in the fully withdrawn
position and point towards the primary
disconnecting devices. The breaker
position indicator on the front of the circuit
breaker should display,
“TEST”
. Rotate the
racking handle in a clockwise direction. The
racking crank arms will move downward
and rotate until the breaker position
indicator displays
“CONN”
. Positive stop
bolts that prevent the racking cranks arms
from rotating prevent further rotation
of the racking shaft. Once the breaker
position indicator displays
“CONN”
, the
racking mechanism will have reached the
end of its travel and a significant increase
in the amount of resistance encountered
will indicate that further force should not
be exerted. In this position, the racking
handle may be removed from the racking
drive shaft extension. It will not be possible
to remove the secondary disconnect
override device due to the operation of the
interlocks as described in
Once again, insert the racking handle onto
the racking drive shaft extension and rotate
in a counterclockwise direction until the
racking crank arms are once more in the
fully withdrawn position and the breaker
position indicator displays
“TEST”
. With
the racking crank arms in this position, the
secondary disconnect override device may
be removed from the secondary disconnect
receptacle.
The above procedures will check the basic
operation of the racking mechanisms and
associated interlocks.
Pole unit parts are energized at full circuit
voltage when the circuit breaker is in the
connected position. Prior to moving the
circuit breaker into the connected position,
make sure that the main barrier assembly has
been properly fastened in place. Failure to
do so may cause equipment damage and/or
minor or moderate injury.
!
CAUTION
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Refer to the metal-clad switchgear instruction
bulletin and drawings produced specifically for
the installed equipment including additional
information and cautions before attempting
to insert the circuit breakers into the circuit
breaker compartment.
Be sure that the racking crank arms at the
sides of the circuit breaker point in the
direction of the primary disconnecting devices
and the circuit breaker position indicator
displays breaker test/disconnected.
NOTICE
