There are two methods available, standard and optional calculations. The calculations are based on the expected loads present in a dwelling unit, along with appropriate demand factors that are used to account for the diversity of electrical use by occupants. Since then, many things have changed, but the primary requirement remains the same - service equipment and conductors must be sized to handle the expected load.Īrticle 220 of the National Electrical Code lays out the primary requirements for performing load calculations that are necessary for determining the size of a residential service. It was in the 1933 NEC that load calculation requirements began to resemble a format that the modern code user would find familiar. Load calculations in the National Electrical Code have evolved over many decades.
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