What does the term "branch circuit" refer to in electrical installations?

The term "branch circuit" refers specifically to a portion of an electrical system that extends from the final overcurrent protective device, such as a circuit breaker or fuse, to the outlets, lighting, or appliances connected to it. This means that the branch circuit is responsible for delivering power to specific devices or outlets within a building.

In residential or commercial installations, a branch circuit typically begins at the electrical panel where it is fed by a circuit breaker and carries electrical current to various loads, such as lights and receptacles. Understanding this concept is crucial for electricians as it helps in circuit layout planning, load calculation, and ensuring safety through proper installation practices.

The focus on the branch circuit in this context emphasizes its role in distributing electrical power throughout an installation rather than referring to the main service panel, safety devices, or ground fault protection systems, which serve different purposes within the electrical system.