Code Quiz of Day

Bend Radius Restrictions for Type MC Cable

Oct. 24, 2014

Article 330 covers the use, installation, and construction specifications of metal-clad cable, Type MC.

Smooth-sheath Type MC cable with an external diameter not greater than 3/4 in. shall have a bending radius not more than _____ times the cable external diameter.

a) five
b) 10
c) 12
d) 15

See answer and applicable Code reference

The correct answer is: b) 10

Article 330 covers the use, installation, and construction specifications of metal-clad cable, Type MC. So as to not to damage this type of cable during installation, bend radius restrictions are outlined in Sec. 330.24. As per 330.24(A)(1), the radius of the inner edge of any bend shall not be less than 10 times the external diameter of the metallic sheath for cable not more than 3/4 in. in external diameter.

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.