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Maximum demand is normally recorded as the highest average over a window of

  • A.one day
  • B.fifteen or thirty minutes
  • C.one second
  • D.one hour

Answer: B

Correct answer: fifteen or thirty minutes

The meter records the average demand over successive fixed intervals, usually fifteen or thirty minutes depending on the utility, and bills on the highest of them in the period. The averaging matters: a momentary starting surge does not set the demand, but a load left running for a whole interval does - which is why staggering starts works and why a brief peak is not worth chasing.

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