With respect to circuits exceeding 277V, nominal to ground, but not exceeding 600V, nominal between conductors, is it permitted to supply luminaires powered from direct-current (DC) systems (excluding exceptions)? A) No, this is not permitted. B) Yes, if luminaires contain a listed DC-rated ballast that provides isolation between the DC power source and the lamp circuit, and protection from electric shock when changing lamps. C) Yes, if the luminaire contains a listed DC-rated ballast and ...

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