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A high-voltage withstand test on a new machine applies

  • A.rated voltage continuously for twenty-four hours
  • B.a direct voltage equal to the rated alternating value
  • C.no voltage at all
  • D.a stated voltage above rated for one minute

Answer: D

The value is set by the standard as a multiple of rated voltage plus a margin, and passing it proves the insulation was built correctly. Repeating it on aged insulation risks damaging it, which is why service testing uses lower voltages.

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