Ground-fault protection of equipment shall be provided for solidly grounded wye electrical systems of more than 150 volts-to-ground, but not exceeding 600V phase-to-phase for each individual device used as a building or structure main disconnecting means rated _____ or more, unless specifically exempted. a) 1,000A b) 1,500A c) 2,000A d) 2,500A

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