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32
Installation
01.4IB.77020
PowlVac-ND
®
and PowlVac-NDA
™
Series 4
Vacuum Circuit Breakers
The breaker position indicator on the
front of the circuit breaker should display,
“
TEST”
. Rotate the racking handle in a
counterclockwise direction. The racking
crank arms will move downward and rotate
until the breaker position indicator displays
“CONN”
. Stop bolts on the side sheet of
the breaker prevent further rotation of
the racking drive 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. Once factory torque limits are
reached a torque limiting clutch on the
racking handle will engage and disallow
any further racking. In this position, the
racking handle may be removed from the
racking drive shaft and the racking drive
shaft shutter will spring back to the closed
position.
Once again, depress the racking drive
shaft shutter, insert the racking handle and
rotate in a clockwise direction until the
racking crank arms are once more in the
fully withdrawn position and the breaker
position indicator displays
“TEST”
.
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.
To insert the circuit breaker into the upper
compartment a lifting device must be used.
Refer to the Lifting Device instruction bulletin
for details on how to insert a circuit breaker
into the upper compartment.
NOTICE
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
Each circuit breaker and circuit breaker
compartment is provided with interference
plates which are designed to ensure that no
circuit breaker with less than the required
voltage, continuous current, or interrupting
current rating is placed in the incorrect circuit
breaker compartment. If you attempt to insert
an improperly rated circuit breaker into the
circuit breaker compartment, these plates will
interfere with each other and deter further
insertion. The interference will occur before
the circuit breaker reaches the disconnected
position. Do not attempt to force the circuit
breaker past the compartment interference
plate or remove the interference plates from
either the compartment or the circuit breaker.