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Guide to the National Electrical Code by Thomas L. Harman

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Chapter 2Services, Feeders, and Branch Circuits

This chapter presents an introduction to the wiring design rules and related calculations used to determine electrical capacities and ratings of conductors and equipment required for the wiring systems in dwelling, commercial, and industrial occupancies. The material presented is grouped according to the three major elements of a premises wiring system: (a) services, (b) feeders, and (c) branch circuits. The utility company’s power distribution system will also be described briefly in order to discuss the entire electrical system.

The Code rules concerned with the electrical capacity of interior or premises wiring systems govern the design of these systems. The minimum or maximum size or rating ...

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