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Article on Residential Load Calculations

jar546

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Great article from the International Association of Electrical Inspectors (IAEI) that I belong to.

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[TD]Posted By Christel Hunter, Wednesday, May 01, 2013

Updated: Tuesday, April 30, 2013[/TD]

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[TD]Load calculations in the National Electrical Code have evolved over many decades. It was in the 1933NEC that load calculation requirements began to resemble a format that the modern code user would find familiar. 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.

Article 220 of theNational Electrical Code lays out the primary requirements for performing load calculations that are necessary for determining the size of a residential service. 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. There are two methods available, standard and optional calculations. Optional calculations require fewer steps and generally result in smaller conductors, but the dwelling unit must meet more restrictive requirements. We will only be considering one-family dwelling units in this article, including single family residences, apartments, etc.

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Complete article in link below:

Residential Service Calculations in the National Electrical Code - International Association of Electrical Inspectors (IAEI)
 
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