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Guide to the National Electrical Code by Thomas L. Harman

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Chapter 5Electrical Circuit Design for Commercial and Industrial Occupancies

ARTICLE 220*

*References in the margins are to the specific applicable rules and tables in the National Electrical Code.

The design of the electrical circuits for commercial and industrial occupancies is based on specific Code rules that relate to the loads present in such occupancies. The design approach is to separate the loads into those for lighting, receptacles, motors, appliances, and other special loads and apply the applicable Code rules. In general, the loads are considered continuous unless specific information is given to the contrary.

215.5

If the electric load is large, the main service may be a three-phase supply which supplies transformers on the premises. ...

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