Protection/NEC

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a4u2fear

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If there is an NEC question on sizing a circuit breaker, is it considered a code and standard question or a protection question; or both?

 
I always considered questions that specifically request usage/reference of NEC as a "Codes and Standards" subtopic under "General Power Engineering". Otherwise, if there is no mention, I would consider it to be a "Protection" question under the "Transmission & Distribution" topic.

But, I don't know, it certainly could be both.

 
If you're asked to size a breaker I would see that strictly as an NEC question. They typically will say "in accordance with the 20XX NEC" though so that should help. The only way I see them asking for the size of a breaker and it being a protection question is if they give you several sizes of breaker in the answers and you have to pick the right breaker that coordinates with the rest of the system.

 

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