Vertical Support Requirements for Nonmetallic Wireways

Article 378 covers the use, installation, and construction specifications for nonmetallic wireways and associated fittings.

Mike Holt

Feb. 24, 2015

Where run vertically, nonmetallic wireways shall be securely supported at intervals not exceeding _____ ft, unless listed otherwise, with no more than one joint between supports.

a) 4
b) 6
c) 8
d) 10

See answer and applicable Code reference

The correct answer is: a) 4

Article 378 covers the use, installation, and construction specifications for nonmetallic wireways and associated fittings. As noted in Sec. 378.30(B), "Vertical runs of nonmetallic wireway shall be securely supported at intervals not exceeding 4 ft, unless listed for other support intervals, and shall not have more than one joint between supports."

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.