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Yes, if those components operate at more than 30V ac or 60V dc [411.1].
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If wet contact is likely to occur, those limits are cut in half. They become 15V ac or 30V dc [411.1].
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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].
- You don't. In fact, they must be ungrounded [411.6(A)].
- The maximum size branch circuit is 20A [411.7]. So no 30A breakers, folks.
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