kVA at 0.9 PF = 210 kVA → 250 kVA transformer.

Traditional utilities used a thermal watt-hour meter with a bimetal strip. The heating curve naturally averaged the load over a 15–30 minute window. The peak pointer indicated the MD. While digital meters have replaced them, understanding this principle clarifies why sustained loads matter.

The absolute sum of the continuous power ratings of all electrical equipment installed in a facility.

Utilities do not charge for a lightning-fast surge (e.g., starting a 200kW motor for 2 seconds). Instead, they measure the sustained load over a sliding window. If your load peaks for 5 minutes and drops to zero, the 30-minute average will be modest. However, if you sustain high load for the entire window, your MD spikes.

A factory that runs 24/7 in summer but only one shift in winter will have very different maximum demands across seasons. Relying on a single annual snapshot can lead to either undersizing (summer overload) or oversizing (winter waste).

Intermittent machinery needs to be carefully assessed for its peak contribution. Conclusion

The fluorescent lights of the Intech Manufacturing plant hummed in a low, monotonous drone, but Elias Thorne didn’t hear them. He was staring at the waveform on his monitor, a jagged line of red cutting through the black background.

The sum of the continuous ratings (in Watts or Amperes) of all electrical apparatus connected to the system. B. Demand Factor (DF)

This report details the preliminary maximum demand calculation for the proposed development at . The assessment ensures the electrical infrastructure is appropriately sized to handle the peak anticipated load while allowing for future expansion.

20 kW connected, demand factor 0.7 → 14 kW