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Code Q&A: SPD Requirements

March 13, 2025

Test your knowledge of the NEC with this challenging question.

Mike Holt

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

Question: SPD's required by 230.67(A) shall be an integral part of the service equipment or shall be located _____.

a) immediately adjacent thereto

b) within 3 ft of the service equipment

c) within 10 ft of the service equipment

d) within sight of the service equipment

See answer below.

Answer: a) immediately adjacent thereto

Per Sec. 230.67(B): "The SPD shall be an integral part of the service equipment or shall be located immediately adjacent thereto."

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.