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    1. National Electrical Code
    2. Q&A

    Code Q&A: Raceway Management in Areas of Differing Temperatures

    Nov. 10, 2022
    Test your knowledge of the NEC.

    Courtesy of www.MikeHolt.com

    Based on the 2020 NEC.

    Q. What are the requirements for raceways exposed to different temperatures?

    See answer below.

    A. If a raceway is subjected to different temperatures, and where condensation is known to be a problem, the raceway must be filled with a material approved by the authority having jurisdiction (AHJ) that will prevent the circulation of warm air to a colder section of the raceway. Sealants must be identified for use with cable insulation, conductor insulation, a bare conductor, a shield, or other components. See Sec. 300.7(A). 

    wiring methods, raceways exposed to different temperatures, sealing

    In addition, raceways must be provided with expansion, expansion-deflection, or deflection fittings, where necessary, to compensate for thermal expansion, deflection, and contraction (Sec. 300.7(B).

    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.

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    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.

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