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WEG Molded Case Circuit Breakers - User’s Manual
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4. Check base, cover, and operating handle for cracks, chipping, and discoloration.
Circuit breakers should be replaced if cracks or severe discoloration is found.
5. Check terminals and connectors 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 reenergizing the circuit breaker, all terminations
and cable should be refurbished to the condition when originally installed.
6. Check circuit breaker mounting hardware, Tighten if necessary.
7. Check area where circuit breaker is installed for any safety hazards, including
personal safety and fire hazards. Exposure to certain types of chemicals can
cause deterioration of electrical connections.
8. The operation of circuit breakers with electronic trip units can be field-tested
periodically using the Seltronic test kit.
3.7. FIELD TESTING
Any field testing should be done in accordance with applicable NEMA Standard.
