Code Q&A: Generator Bonding Requirements

May 13, 2021

What is the Code rule for neutral connection bonding of a portable or vehicle-mounted generator?

Based on the 2020 NEC.

Q. What is the Code rule for neutral connection bonding of a portable or vehicle-mounted generator?

See answer below.

A. Section 250.34(C) Neutral Conductor Bonding. The generator manufacturer is required to bond the neutral conductor to the generator frame where the generator is a component of a separately derived system.

Informational Note: For grounding portable generators supplying fixed wiring systems, see Sec. 250.30.

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About the Author

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.