Code Q&A: Overcoming the Elements

What does the Code require if enclosures containing overcurrent protection devices are to be installed in damp or wet locations?

Mike Holt

Dec. 20, 2018

Q. What does the Code require if enclosures containing overcurrent protection devices are to be installed in damp or wet locations?

See the answer below.

This answer is based on the 2017 NEC.

A. In damp or wet locations, enclosures containing overcurrent protection devices must prevent moisture or water from entering or accumulating within the enclosure. When the enclosure is surface mounted in a wet location, it must be mounted with not less than ¼ in. of air space between it and the mounting surface. See Sec. 312.2 [240.32].

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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.