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Topic: 310.15 (B) (7)....Again

User: A/A Fuel GTX, Location: WI & AZ

Asked on: Wednesday, March 16, 2011 at 2:39 pm EDT
Answered on: Tuesday, May 14, 2024 at 2:53 am EDT

Question: Overhead service on a yard pole with a 320A meter socket, double lugged load side, 2ea 200A loadcenters, one feeder the house from loadcenter one, one feeder to an out building from loadcenter two. 310.15 (B) (7) would not apply for the service entrance conductors but would for the feeders, correct?

Yes, 310.15 (B) (7) would not apply for the service entrance conductors but would for the feeders.
310.15 (B)(7) requires that each ungrounded service entrance conductor terminate in a single circuit breaker or a single set of fuses that will simultaneously disconnect all ungrounded conductors of that circuit. This requirement ensures that all ungrounded conductors of a service are disconnected simultaneously to prevent the possibility of backfeed from a generator or other source.However, this requirement does not apply to feeder conductors. Feeder conductors are the conductors that connect the service equipment to the loadcenters or other distribution equipment. Feeder conductors are not required to be simultaneously disconnected because they are not directly connected to the service entrance. Flag for review

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