Exposed elements of impedance heating systems shall be physically guarded, isolated, or thermally insulated with a _____ jacket to protect against contact by personnel in the area.
a) corrosion-resistant
b) waterproof
c) weatherproof
d) flame-retardant
See answer and applicable Code reference
The correct answer is: c) weatherproof
The requirements of Art. 426 apply to electrically energized heating systems such as fixed outdoor electric deicing and snow-melting equipment. As noted in Sec. 426.30 with regard to personnel protection, "Exposed elements of impedance heating systems shall be physically guarded, isolated, or thermally insualted with a weatherproof jacket to protect against contact by personnel in the area."
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.