Q. When does the Code require ground-fault protection of equipment on service disconnects?
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This answer is based on the 2017 NEC.
A. Ground-fault protection of equipment is required for 277/480V service disconnects rated 1,000A or more. The rating of the service disconnect is based on the rating of the largest fuse that can be installed or the circuit breaker’s highest continuous current trip setting [Sec. 230.95].
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Mike Holt
Mike Holt is the owner of Mike Holt Enterprises (www.MikeHolt.com), one of the largest electrical publishers in the United States. He earned a master's degree in the Business Administration Program (MBA) from the University of Miami. He earned his reputation as a National Electrical Code (NEC) expert by working his way up through the electrical trade. Formally a construction editor for two different trade publications, Mike started his career as an apprentice electrician and eventually became a master electrician, an electrical inspector, a contractor, and an educator. Mike has taught more than 1,000 classes on 30 different electrical-related subjects — ranging from alarm installations to exam preparation and voltage drop calculations. He continues to produce seminars, videos, books, and online training for the trade as well as contribute monthly Code content to EC&M magazine.