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Testing of circuit breakers
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hello @jparasu
after some discution with some other experts.
The only MCCB testing requirements for NFPA 70E are in Article 225 and only requires tests after a fault based on manufacturer’s instructions . There are electrical testing requirement in NFPA 70B Section 15.3.5, but does not tell the user what method of testing to use.
The NEC also has performance testing for any 1200A and above breaker where section 240.87 is required to verify arc energy reduction requirements are met. SE’s position on testing is secondary current injection testing, Commissioning Software testing, and primary current injection, in that order.
Manufacturer’s recommendations from document 0613IB1202 (recomendations are same on compact NSx MCCB IEC).
Secondary injections every 2 years. (secondary injection to test the tripping, and low current level primary just to check that display meters current which verifies chain from CTs to trip unit connections).
Some kind of primary injection testing every 5 years to check the tripping chain.
Best regards
Link copied. Please paste this link to share this article on your social media post.
hello @jparasu
after some discution with some other experts.
The only MCCB testing requirements for NFPA 70E are in Article 225 and only requires tests after a fault based on manufacturer’s instructions . There are electrical testing requirement in NFPA 70B Section 15.3.5, but does not tell the user what method of testing to use.
The NEC also has performance testing for any 1200A and above breaker where section 240.87 is required to verify arc energy reduction requirements are met. SE’s position on testing is secondary current injection testing, Commissioning Software testing, and primary current injection, in that order.
Manufacturer’s recommendations from document 0613IB1202 (recomendations are same on compact NSx MCCB IEC).
Secondary injections every 2 years. (secondary injection to test the tripping, and low current level primary just to check that display meters current which verifies chain from CTs to trip unit connections).
Some kind of primary injection testing every 5 years to check the tripping chain.
Best regards
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