Which is a key characteristic of a branch circuit?

A branch circuit is defined as the portion of an electrical distribution system that extends from the final overcurrent device (like a circuit breaker or fuse) to the electrical outlets or devices. The supply of electricity from the electrical service panel is a fundamental characteristic of a branch circuit; it indicates where the circuit receives its power.

This relationship underscores that branch circuits are the final components of the overall electrical system that deliver power to devices or outlets, making the supply connection to the electrical service panel essential for their operation. Other characteristics may apply to branch circuits, but the connection to the service panel is foundational, as without it, the branch circuit would not function.