Code Q&A: NEC Requirements for Securing and Supporting PVC

Oct. 26, 2023

Test your knowledge of the NEC.

Q. What are the NEC requirements for securing and supporting PVC?

See answer below.

A. The requirements for securing and supporting PVC are found in Sec. 352.30.

PVC conduit must be fastened and supported in accordance with (A) and (B) so movement from thermal expansion and contraction is permitted.

(A) Securely Fastened. PVC conduit must be secured within 3 ft of every box, cabinet, or termination fitting, such as a conduit body (Figure).

(B) Supports. PVC conduit must be supported at intervals not exceeding the values in Table 352.30, and the raceway must be fastened in a manner that permits movement from thermal expansion or contraction.

PVC conduit installed horizontally in bored or punched holes in wood or metal framing members, or notches in wooden members, is considered supported, but the raceway must be secured within 3 ft of termination.

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