Max Demand Work Site

Engineers use maximum demand to size transformers, cables, and circuit breakers. If you design based on the "Connected Load," you will over-spend on massive cables that are rarely used. Conversely, if you ignore maximum demand, your main breakers will trip or cables will overheat during peak usage periods. 2. Utility Billing and Demand Charges

[ \textDemand t = \fracE (t - T) + E_(t - T + \Delta t) + ... + E_tT ] Where (E) = energy measured over subinterval (\Delta t), (T) = total demand interval. max demand

Standard intervals by application: | Interval | Typical Use | Rationale | |----------|-------------|-----------| | 15 min | Industrial, large commercial | Reflects thermal time constant of medium-sized equipment | | 30 min | Commercial buildings, small factories | Common in Europe/Asia (e.g., UK, Australia) | | 60 min | Very large industrial, some utilities | Matches some bulk supply agreements | Engineers use maximum demand to size transformers, cables,

Installing capacitors at the point of common coupling reduces kVA demand for a given kW load. If tariff is kVA-based, this directly reduces MD. Standard intervals by application: | Interval | Typical