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Instruction Leaflet IL 29C703D
Effective April 2011
4. 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 do a limited amount of field inspection and testing
of a circuit breaker .
Inspection
Circuit breakers in service should be inspected periodically . The
inspection should include the following checks: 4-1 through 4-7 .
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4-1 .
Remove dust, dirt, soot, grease or moisture from the surface
of the circuit breaker using a lint-free dry cloth, brush or vacu-
um cleaner . Do not blow debris into circuit breaker . If contami-
nation is found, look for the source and eliminate the problem .
4-2 .
Switch the circuit breaker to ON and OFF several times to be
sure that the mechanical linkages operate freely and do not
bind . If mechanical linkages do not operate freely, replace cir-
cuit breaker .
4-3 .
With the circuit breaker in the ON position, press the PUSH-
TO-TRIP button to mechanically trip the circuit beaker . Trip,
reset and switch the circuit breaker ON several times . If the
mechanism does not reset each time the circuit breaker is
tripped, replace the circuit breaker .
4-4 .
Check base, cover, operating handle and the handle barrier for
cracks, chipping and discoloration . Circuit breakers should be
replaced if cracks or severe discoloration is found .
4-5 .
Check wire connecting terminals and other type bus bar con-
nectors for looseness or signs of overheating . Overheating
will show as discoloration, melting or blistering 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, terminations should be cleaned or replaced .
Before re-energizing the circuit breaker, all terminations and
cable should be refurbished to the original installed condition .
4-6 .
Check circuit breaker mounting hardware and tighten if neces-
sary .
4-7 .
Exposure to certain types of chemicals can lead to deteriora-
tion of electrical connections . Check area where circuit break-
er is installed for any safety hazards, including personal safety
and fire hazards and take required precautionary actions .
Field Testing
Any field-testing should be done in accordance with applicable
NEMA Standard .
6
EATON CORPORATION www.eaton.com
D
D
Installation Instructions for Eaton Series C 600 Amp HLD-DC
Circuit Breakers, Circuit Breaker Frame and Molded Case Switch
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