Code Q&A: Overcurrent Protection for Ungrounded Conductors

NEC guidelines on overcurrent protection for ungrounded conductors

Q. What are the Code requirements for overcurrent protection for ungrounded conductors?

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A. A fuse or circuit breaker must be connected in series with each ungrounded conductor [240.15(A)]. Circuit breakers must automatically (and manually) open all ungrounded conductors of the circuit, except as follows [240.15(B)]:

1) Multiwire Branch Circuits. Individual single-pole breakers with id

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