Code Q&A: Branch Circuit Rating

NEC requirements for branch circuit rating

Q. What designates the rating of a branch circuit in the NEC?

Find the Answer

A. The rating of a branch circuit is determined by the rating of the branch circuit overcurrent device, not the conductor size [210.3]. For example, the branch circuit ampere rating of a 10 THHN conductor on a 20A circuit breaker is 20A.

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