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Maximum demand for billing is conventionally taken as the highest average power over a

  • A.fifteen or thirty minute interval
  • B.one second interval
  • C.twenty-four hour period
  • D.whole billing month

Answer: A

Correct answer: fifteen or thirty minute interval

Demand is measured as the highest average power sustained over a defined block, not as an instantaneous peak, because it is sustained load that determines the capacity the network must provide. A momentary starting surge lasting a second heats nothing and is ignored; a half hour at high load does, and is charged for.

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