General Requirements Article 220 establishes the general requirements for calculating electrical loads for a building. The calculations are based on the expected usage of the building, and the load calculations must be performed in accordance with the specific requirements of Article 220.

Branch Circuit Load Calculations Article 220 provides specific guidelines for calculating the load of each individual branch circuit. The load calculation takes into account the expected use of the circuit, the type of loads that will be connected to the circuit, and the capacity of the circuit breaker or fuse that protects the circuit.

Feeder and Service Load Calculations Article 220 also provides guidelines for calculating the load of the feeders and service entrance conductors that supply power to the building. The calculation takes into account the expected usage of the building, the number of branch circuits, and the connected loads.

Demand Factors Article 220 provides a number of demand factors that can be used to reduce the calculated load for certain types of loads, such as lighting, heating, and cooling. The demand factors are based on statistical data and are intended to provide a more accurate representation of the actual load on the electrical system.

Optional Calculation Methods Article 220 provides several optional methods for calculating electrical loads, such as the optional general lighting and receptacle load calculation method and the optional demand factors for specific loads. These optional methods are intended to provide flexibility and to account for variations in building usage.

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