How are circuits classified in the NEC?

Circuits are classified in the National Electrical Code (NEC) primarily as branch circuits, feeder circuits, and service entrance circuits. This classification is essential for understanding the different roles that various types of circuits play within an electrical system.

Branch circuits are the circuits that distribute electrical power to different outlets or fixtures within a building, supplying power to devices directly. Feeder circuits, on the other hand, are used to carry electrical power from the service equipment to the branch circuit panels. Service entrance circuits refer to the circuits that bring electricity from the utility provider into the building, typically including the main disconnect and any associated meter equipment.

This classification helps in the design, use, and safety of electrical installations, ensuring that each part of the system meets specific requirements and standards set by the NEC. Understanding this framework is crucial for electricians, as it impacts load calculations, wiring methods, and compliance with electrical codes.