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An instrument used on a 415 V distribution board must carry

  • A.a calibration certificate less than a month old
  • B.a display readable in direct sunlight
  • C.an insulation resistance range of at least a megohm
  • D.an adequate measurement category rating

Answer: D

The category expresses the transient the instrument and its leads can survive at that point in the installation, and one rated for a socket outlet is not safe at a main switchboard. It is a safety requirement rather than an accuracy one.

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