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Code Q&A: Bending Rules for Type MC Cable

May 17, 2018
See if you know: What are the NEC requirements for bends made in Type MC cable?

Q. What are the NEC requirements for bends made in Type MC cable?

See the answer below.

This answer is based on the 2017 NEC.

A. Bends must be made so the cable won’t be damaged, and the radius of the curve of any bend at the inner edge of the cable isn’t permitted to be less than what’s dictated in each of the following instances [330.24]:

(A) Smooth-sheath cables.

     (1) Smooth-sheath Type MC cables aren’t permitted to be bent so the bending radius of the inner edge of the cable is less than 10 times the external diameter of the metallic sheath for cable up to ¾ in. in external diameter.

(B) Interlocked or corrugated sheath. Interlocked- or corrugated-sheath Type MC cable isn’t permitted to be bent so the bending radius of the inner edge of the cable is less than seven times the external diameter of the cable.

These materials are provided to us by Mike Holt Enterprises of Leesburg, Fla. To view additional 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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