Simply put, Maximum Demand is the highest average load (in kilowatts, kW, or kilovolt-amperes, kVA) that an electrical installation draws from the supply network over a specified period—typically 15, 30, or 60 minutes.
[ MD = \left( \sum_i=1^n (Load_i \times Demand\ Factor_i) \right) \times Diversity\ Factor ] maximum demand calculation
Wait – be careful. In British (IEC) standards, the relationship is often inverted. The safest universal formula is the "Sum of Individual Demands after applying DF, then divided by Diversity Factor." Simply put, Maximum Demand is the highest average