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29
Installation
01.4IB.77000B
Each circuit breaker and metal-clad switchgear
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
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.
The PowlVac-ND® circuit breaker may be
racked manually or electrically using the
optional Power Racking device.
The PowlVac-ND circuit breaker is
designed to be manually racked into the
circuit breaker compartment with the
compartment door closed. The optional
Power Racking device may be fitted on
the closed circuit breaker compartment
door to eliminate manual operation.
Note:
The described racking procedures
are for racking the circuit breaker
into the lower circuit breaker
compartment only. To rack the circuit
breaker into an upper circuit breaker
compartment, refer to the metal-clad
switchgear instruction bulletin for
detailed information.
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