Code Q&A: NEC Requirements for Installing MC Cable for Exposed Work

May 11, 2023

Test your knowledge of the NEC.

Q. What are the NEC requirements for installing MC cable for exposed work?

See answer below.

A. The requirements for installing MC cable for exposed work are found in Sec. 330.15.

Section 330.15 requires thay exposed runs of Type MC cable, except as provided in Sec. 300.11(B), must closely follow the surface of the building finish or running boards. Type MC cable installed on the bottom of floor or ceiling joists must be secured at every joist and not be subject to physical damage.

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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.