SECTION 4: INITIAL INSPECTION AND
INSTALLATION
4-1
INTRODUCTION
WARNING
BEFORE PLACING THE CIRCUIT BREAKER IN
SERVICE, CAREFULLY FOLLOW THE INSTALLATION
PROCEDURE GIVEN BELOW. NOT FOLLOWING THE
PROCEDURE CAN FAIL TO UNCOVER SHIPPING
DAMAGE THAT MAY RESULT IN INCORRECT CIRCUIT
BREAKER OPERATION LEADING TO DEATH, BODILY
INJURY, AND EQUIPMENT DAMAGE.
Before attempting to put a circuit breaker in service, it
should be carefully examined and operated manually and
electrically. In addition, carefully examine the breaker for
loose or obviously damaged parts. The following
information is a guide for performing recommended checks
and tests.
4-2
VACUUM INTERRUPTER INTEGRITY
Using a dry, lint free cloth or paper towel, clean all the
accessible insulating surfaces of the pole units. Conduct a
vacuum interrupter integrity check as described in
Section 6.
4-3
INSULATION
Check the circuit breaker’s primary and secondary
insulation as described in Section 6.
4-4
PRIMARY CIRCUIT RESISTANCE
Check the primary circuit resistance as described in
Section 6. The resistance should not exceed the values
specified. Record the values obtained for future reference.
4-5
NAMEPLATE
Compare the circuit breaker nameplate information with
switchgear drawings for compatibility.
4-6
ELECTRICAL OPERATION AND MECHANICAL
OPEN 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.