Code Q&A: Flexible Metal Conduit

Jan. 18, 2013

Your most pressing National Electrical Code (NEC) questions answered

Q. What uses does the NEC permit and forbid for flexible metal conduit?

A. According to 348.10 of the 2011 NEC, flexible metal conduit (FMC) is permitted in exposed or concealed locations. On the other hand, the locations where FMC is not permitted are much more specific. As noted in 348.12, FMC shall not be used:

In wet locations.
In hoistways, other than as permitted in 620.21(A)(1).
In storage battery rooms.
In any hazardous location, except as permitted by 501.10(B).
Exposed to material having a deteriorating effect on the installed conductors.
Underground or embedded in poured concrete.
If subject to physical damage.

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.