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38
Installation
01.4IB.77020
PowlVac-ND
®
and PowlVac-NDA
™
Series 4
Vacuum Circuit Breakers
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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.
Remove the incorrectly rated circuit breaker
and insert a properly rated circuit breaker into
the circuit breaker compartment.
1) Prior to Inserting the Circuit Breaker into the
Circuit Breaker Compartment
a. Check the Primary Disconnecting
Devices and Circuit Breaker
Compartment
Examine the primary disconnecting
devices for any signs of damage and
contamination. Check to see that
none are bent out of alignment. If
contamination is found refer to
Description, 2) Inspection and Cleaning
and
for cleaning and
lubrication procedures. If the primary
disconnecting devices are damaged
make no attempt to repair. Contact
Powell for further information.
Examine the circuit breaker
compartment to see that it is clean and
clear of debris that might interfere with
circuit breaker travel.
Before inserting any circuit breaker into a
compartment, the user must verify that the
circuit breaker rating meets or exceeds the
metal-clad switchgear rating.
CAUTION
Before inserting a circuit breaker into the
circuit breaker compartment, be sure that
the indicator flag on the front cover
of the circuit breaker displays “TEST”.
CAUTION
