Code Q&A: NEC Requirements for Equipment Grounding Conductor Sizing

Feb. 22, 2024

Test your knowledge of the NEC with this challenging question.

Courtesy of www.MikeHolt.com. Based on the 2023 NEC.

Question: Except as provided in Sec. 250.122(F)(2)(c) for raceway or cable tray installations, the equipment grounding conductor in each multiconductor cable shall be sized in accordance with Sec. 250.122 based on the _____.

a) largest circuit conductor

b) overcurrent protective device for the feeder or branch circuit

c) smallest branch-circuit conductor

d) overcurrent protective device for the service

See answer below.

Answer: b) overcurrent protective device for the feeder or branch circuit

Section 250.122(F)(2)(a) states, "Except as provided in 250.122(F)(2)(c) for raceway or cable tray installations, the equipment grounding conductor in each multiconductor cable shall be sized in accordance with 250.122 based on the overcurrent protective device for the feeder or branch circuit."

These materials are provided 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.