6
Instruction Leaflet
IL 29C702E
Effective April 2015
Installation Instructions for the HKDDC
Circuit Breaker and Molded Case Switch
EATON CORPORATION www.eaton.com
3. Inspection and Field Testing
Series C molded case circuit breakers are designed to provide years
of almost maintenance-free operation. The following procedure
describes how to inspect and test a circuit breaker in service.
Inspection
Circuit breakers in service should be inspected periodically. The
inspection should include the following checks 3-1 through 3-8.
WARNING
BEFORE INSPECTING THE CIRCUIT BREAKER IN AN ELECTRICAL SYSTEM,
MAKE SURE THE CIRCUIT BREAKER IS SWITCHED TO THE OFF POSITION
AND THAT THERE IS NO VOLTAGE PRESENT WHERE WORK IS TO BE
PERFORMED. SPECIAL ATTENTION SHOULD BE PAID TO REVERSE FEED
APPLICATIONS TO ENSURE NO VOLTAGE IS PRESENT. THE VOLTAGES
IN ENERGIZED EQUIPMENT CAN CAUSE SEVERE PERSONAL INJURY OR
DEATH.
CAUTION
MAKE SURE THAT CLEANING AGENTS OR SOLVENTS USED TO CLEAN
THE CIRCUIT BREAKER ARE SUITABLE FOR THE JOB. SOME COMMERCIAL
CLEANING AGENTS WILL DAMAGE THE NAMEPLATES OR MOLDED
PARTS.
3-1. Remove dust, dirt, soot, grease, or moisture from the surface
of the circuit breaker using a lint-free dry cloth, brush, or vacuum
cleaner. Do not blow debris into circuit breaker. If contamination is
found, look for the source and eliminate the problem.
3-2. Switch circuit breaker to ON and OFF several times to be sure
that the mechanical linkages are free and do not bind. If mechanical
linkages are not free, replace circuit breaker.
3-3. With the circuit breaker in the ON position, press the PUSH
TO-TRIP button to mechanically trip the circuit breaker. Trip, reset,
and switch circuit breaker ON several times. If mechanism does
not reset each time the circuit breaker is tripped, replace the circuit
breaker.
3-4. Check base, cover, and operating handle for cracks, chipping,
and discoloration. Circuit breakers should be replaced if cracks or
severe discoloration is found.
3-5. Check terminals and connectors for looseness or signs of over-
heating. Overheating will show as discoloration, melting, or blister-
ing of conductor insulation, or as pitting or melting of conductor
surfaces due to arcing.
If there is no evidence of overheating or looseness, do not disturb or
tighten the connections. If there is evidence of overheating, termina-
tions should be cleaned or replaced. Before re-energizing the circuit
breaker, all terminations and cable should be refurbished to the con-
dition when originally installed.
3-6. Check circuit breaker mounting hardware, and tighten if neces-
sary.
3-7. Check area where circuit breaker is installed for any safety haz-
ards, including personal safety and fire hazards. Exposure to certain
types of chemicals can cause deterioration of electrical connections.
Field Testing
Any field testing should be done in accordance with applicable
NEMA Standards.
Figure 12. Circuit Breaker Manual Controls.
