Code Q&A: Sizing a Grounding Electrode Conductor

Feb. 26, 2015

NEC guidelines for sizing grounding electrode conductors

Q. How is the grounding electrode conductor (GEC) sized when it’s to be connected to a concrete-encased electrode?

Find the Answer

A. If the GEC is connected to one or more concrete-encased electrodes, as permitted in Sec. 250.52(A)(3), the portion of the GEC that’s the sole connection to the concrete-encased electrode(s) isn’t required to be larger than 4 AWG copper [250.66(B)].

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.