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29
Installation
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Refer to the metal-clad switchgear instruction
bulletin and drawings produced specifically
for the installed equipment for additional
information and cautions before attempting
to insert the circuit breaker into the metal-clad
switchgear equipment.
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 an improperly rated
circuit breaker is inserted 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 incorrect 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
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.
b. Racking the Circuit Breaker into the
Circuit Breaker Compartment
The described racking procedures
apply only for indoor type and non arc
resistant constructions. For all other
constructions, refer to the appropriate
instructions or instruction bulletin(s) for
the applicable racking procedures.
!
CAUTION
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
“BREAKER TEST/DISCONNECTED”.
