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National Electrical Code Articles and Information

NEC Quiz: Article 424, Part 1 Answers

by Mark Lamendola

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  1. Yes, it is. But process heating and room air conditioning are not [424.1].

  2. It's covered by Article 424 AND by Article 440, unless the type of heat pump involved does not have a hermetic refrigerator motor-compressor [424.2].

  3. The limit is 90A [424.3(A)]. And in anything other than a dwelling unit, a branch circuit supplying infrared heating equipment can't exceed 50A [242.3(A)]

  4. Fixed electric space-heating equipment and motors are considered continuous loads [424.3(B)].
  5. They must be listed for such a location, and must be constructed and installed so that liquids cannot enter or accumulate in or on wired sections, electrical components, or ductwork [424.12(B)].