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Code Q&A: NEC Requirements for RMC

Sept. 28, 2023
Test your knowledge of the NEC.

Courtesy of www.MikeHolt.com

Q.  What are the conditions RMC can be used and installed?

See answer below.

A.  The condition where RMC can be used and installed are found in Sec. 344.10. 

(A) Atmospheric Conditions and Occupancies.

(1) RMC is permitted in all atmospheric conditions and occupancies.

(B) Corrosive Environments.

(1) RMC fittings, elbows, and couplings can be installed in concrete, in direct contact with the Earth, or in areas subject to severe corrosive influences if approved for the condition. 

(D) Wet Locations. Support fittings (such as screws, straps, and so forth) installed in a wet location must be made of corrosion-resistant material or protected by corrosion-resistant coatings in accordance with Sec. 300.6.

(E) Severe Physical Damage. RMC is permitted where subject to severe physical damage. 

These materials are provided to us 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.

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