IB131006EN
Page 20
Effective 07/2017
4-8 ELECTRICAL OPERATION CHECK
After having completed all previous checks and tests, the
circuit breaker is ready to be operated electrically. It is
preferred that this check be made with the circuit breaker
in a TEST position or by using a test cable, if the circuit
breaker is outside the cell structure.
CAUTION
BEFORE INSERTING THE CIRCUIT BREAKER
EXAMINE THE INSIDE OF THE CELL STRUCTURE
FOR EXCESSIVE DIRT OR ANYTHING THAT MIGHT
INTERFERE WITH THE CIRCUIT BREAKER
MOVEMENT.
WARNING
EXTREME CAUTION MUST BE EXERCISED TO
INSURE THAT PRIMARY CIRCUITS ARE NOT
ENERGIZED WHILE CHECKS ARE PERFORMED IN
THE CIRCUIT BREAKER COMPARTMENT. FAILURE
TO DO SO MAY RESULT IN PERSONAL INJURY OR
DEATH.
The circuit breaker is normally tested electrically in its
cell structure in the TEST position. To achieve the TEST
position, the circuit breaker must first be placed in the
cell structure and the secondary contacts engaged. To
complete this testing procedure, the operator should first
be familiar with inserting and removing the circuit breaker
into and from the cell structure.
4-8.1
CIRCUIT BREAKER INSERTION AND
REMOVAL
NOTICE
Inserting breaker:
A. Lower compartment direct roll-in-breaker
Push the breaker into the breaker compartment until the
breaker T-handle latches over the moving block on the
levering screw assembly. In this position, the breaker is
considered in the Disconnect position.
B. Upper compartment or non-direct roll-n-breaker
1. The breaker compartment has an interlock assembly
on the compartment levering assembly, located on
both the left and right hand rail assemblies. The
purpose of the interlock assembly is to prevent the
breaker from being removed from the compartment
2. In order to insert or remove a breaker a set of
extension rails must be inserted into the left hand
and right hand rail assemblies .This is achieved by
inserting the appropriate rail, identified with a
label, diagonally into the slot such that the
extension rail, when lowered, unlocks the interlock
allowing an installed circuit breaker to roll forward.
The rolling surfaces of the compartment rail and
extension rail are flush.
3. In this position, the breaker can be inserted or
removed from the breaker compartment (see
Figure 4-2A and Figure 4-2B).
Figure 4-2A Insertion of the Drawout Extension Rails
Figure 4-2B Lifting and Setting the Breaker in the
Housing
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