NEC Quiz: Article 411 Answers

by Mark Lamendola

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  1. Yes, if those components operate at more than 30V ac or 60V dc [411.1].

  2. If wet contact is likely to occur, those limits are cut in half. They become 15V ac or 30V dc [411.1].

  3. You can use any appropriate Chapter 3 wiring method or you can use the wiring supplied by a listed Class 2 source and installed per 725.103 [411.5].

  4. You don't. In fact, they must be ungrounded [411.6(A)].

  5. The maximum size branch circuit is 20A [411.7]. So no 30A breakers, folks.