Code Q&A: Rules Related to Conductor Splicing

Test your knowledge of the NEC.

Dec. 22, 2022

Q. What are the rules related to conductor splicing?

See answer below.

A. You can find conductor splicing requirements in Sec. 300.15 [Boxes or Fittings, Splices and Terminations].

(A) Wiring Methods with Interior Access. A box is not required for wiring methods with removable covers such as wireways, multioutlet assemblies, and surface raceways.

(G) Underground Conductor and Cable Splices. A box is not required where a splice is made underground if Type UF or USE conductors are spliced with a splicing device listed for direct burial. (Figure)

The only conductors permitted to be direct buried are Type UF [Sec. 340.10(1)] and Type USE [Sec. 338.10(B)(4)(b)(2)].

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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.