Code Q&A: NEC Requirements Related to Cabinets for Panelboards in Walls

Test your knowledge of the NEC.

April 13, 2023

Q. What are the NEC requirements related to cabinets for panelboards in walls?

See answer below.

A. The requirements related to cabinets for panelboards in walls are found in Sec. 312.3 of the NEC. Cabinets for panelboards installed in walls of noncombustible material must be installed so the front edge of the cabinet is set back no more than ¼ in. from the finished surface. In walls constructed of wood or other combustible material, cabinets for panelboards must be flush with the finished surface or project outward.

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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.