Q. What conductor types does the NEC permit to be used in dry and damp locations?
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This answer is based on the 2017 NEC.
A. Insulated conductors typically used in dry and damp locations include Types THHN, THHW, THWN, or THWN‑2. Other conductor insulations that can be used are Types FEB, FEPB, MTH, PFA, RHH, RHW, RHW-2, and SA [310.10(B)].
Refer to Table 310.104 for a complete list of conductors that may be installed in dry or damp locations. See Table 400.4 for the use of flexible cords and flexible cable permitted in dry or damp locations.
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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.