What is defined as a "branch circuit" in electrical systems?

A "branch circuit" is defined specifically as a circuit that extends from the final overcurrent device, such as a circuit breaker or fuse, to the outlets or devices that it feeds. This includes various types of electrical loads, such as lights, receptacles, and other equipment connected within a residential or commercial electrical system.

This definition is critical because branch circuits play a key role in distribution within an electrical system, ensuring that power is safely delivered to individual devices while being protected by an overcurrent device that limits the current flow to prevent overheating or fire hazards.

Other choices, while related to electrical circuits, do not accurately represent the function or definition of a branch circuit. For instance, circuits connecting transformers to the power grid or those designed solely for lighting fixtures fall under different categorizations and do not encapsulate the broader application of branch circuits in everyday electrical installations.