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Code Q&A: Connection of Bonding and Grounding Equipment

Jan. 24, 2019

See if you know what the Code requires for termination of bonding and grounding conductors.

Q. What are the Code permitted methods for the termination of bonding and grounding conductors?

See the answer below.

This answer is based on the 2017 NEC.

A. As outlined in Sec. 250.8(A), equipment grounding conductors, grounding electrode conductors, and bonding jumpers must terminate in one or more of the following methods:

(1) Listed pressure connectors

(2) Terminal bars

(3) Pressure connectors listed for grounding and bonding

(4) Exothermic welding

(5) Machine screws that engage at least two threads or are secured with a nut

(6) Self-tapping machine screws that engage at least two threads

(7) Connections that are part of a listed assembly

(8) Other listed means

Per Sec. 250.8(B), connection devices or fittings that depend solely on solder aren’t allowed.

These materials are provided to us by Mike Holt Enterprises in Leesburg, Fla. To view Code training materials offered by this company, visit www.mikeholt.com/code.

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.