Code Q&A

Code Q&A

What are the Code requirements for bonding bushings on 277V or 480V branch and feeder and circuits?

Q. What are the Code requirements for bonding bushings on 277V or 480V branch and feeder and circuits?

A.Metal raceways or cables containing 277V and/or 480V branch or feeder circuits terminating at ringed knockouts must be bonded to the metal enclosure with a bonding jumper sized in accordance with 250.122, based on the rating of the circuit overcurrent device [250.102(D)]. A bonding jumper isn’t required where ringed knockouts aren’t encountered or where the box is listed to provide a reliable bonding connection as in a typical 4 square outlet box [250.97].

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