6
Instruction Leaflet
IL01202013EH01
Installation Instructions For EG-DC Circuit Breaker
and Molded Case Switch
EATON CORPORATION www.eaton.com
4. Inspection and Field Testing
Series G 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 (4-1 through 4-7):
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 PRESE NT WHERE WORK IS TO BE
PERFORMED. SPECIAL ATTENTION SHOULD BE PAID TO REVERSE FEED
APPLICATIONS TO ENSURE VOLTAGE IS PRESE NT. THE VOLTAGES IN
ENERGIZED EQUIPMENT CAN CAUSE DEATH OR SEVERE PERSONAL
INJ URY.
CAUTION
MAKE SURE THAT CLEANING AGENTS OR SOLVENTS USED TO CLEAN
THE CIRCUIT BREAKER ARE SUITABLE FOR THE J OB. SOME COMMERCIAL
CLEANING AGENTS WILL DAMAGE THE NAME PLATES OR MOLDED
PARTS.
4-1. 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.
4-2. 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.
4-3. 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.
4-4. Check base, cover, and operating handle for cracks, chipping,
and discoloration. Circuit breakers should be replaced if cracks or
severe discoloration is found.
4-5. 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 sur-
faces due to arcing. If there is no evidence of overheating or loose-
ness, do not disturb or tighten the connections. If there is evidence
of overheating,terminations should be cleaned or replaced. Before
reenergizing the circuit breaker, all terminations and cable should be
refurbished to the condition when originally installed.
4-6. Check circuit breaker mounting hardware, tighten if necessary.
4-7. Check area where circuit breaker is installed for any safety haz-
types of chemicals can cause deterioration of electrical connections.
Field Testing
NEMA Standards.
