Code Q&A

Q. What are the NEC requirements for using electrical metallic tubing (EMT) to physically protect NM cable? A. For one, a nonmetallic bushing or adapter must be installed at the point where the cable enters the raceway . In unfinished basements, the ...

Mike Holt

Jan. 12, 2007

Q. What are the NEC requirements for using electrical metallic tubing (EMT) to physically protect NM cable?

A. For one, a nonmetallic bushing or adapter must be installed at the point where the cable enters the raceway [300.15(C)]. In unfinished basements, the raceway and metal outlet boxes must be grounded (bonded) to an effective ground-fault current path in accordance with 250.148 [334.15(C)].

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.