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The tolerance permitted on a domestic energy meter is usually specified

  • A.only at rated current
  • B.as a percentage that varies with the fraction of rated load
  • C.as a single percentage applying equally at every load from zero to full
  • D.in absolute units of kilowatt hours per month of service

Answer: B

Standards allow a wider error at five per cent of rated current than at full load, because the friction correction cannot be perfect over the whole range. Accuracy classes are quoted as a figure such as class 1 or class 2, with a table of limits against load.

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