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National Electrical Code Articles and Information

NEC Quiz: Article 424, Part 2 Answers

by Mark Lamendola

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  1. Yes, if it is listed for such use. But typically, this kind of equipment isn't. So the default answer is no until you can verify the requisite listing. And by default you want to meet or exceed the required spacing between the equipment and combustible material [424.13].

  2. No, the disconnect must simultaneously disconnect all three of these [424.19].

  3. You must install the disconnect within sight of the supplementary overcurrent device(s) and on the supply side of the same overcurrent device(s) [424.19(A)].

  4. If the heater has no motor rated over 1/4 horsepower, follow 424.19(A)(1). If any motor in the heater is rated over 1/4 horsepower, follow 424.19(A)(2).
  5. When the heater does not have a motor over 1/4 horsepower (that includes heaters without a motor), and the breaker is within sight of the heater or is lockable per 110.25 [424.19(B)(1)].