What is the definition of a branch circuit in electrical terminology?

A branch circuit is defined as a circuit that extends from the final overcurrent device (such as a circuit breaker) to the outlets, devices, or equipment it supplies. The correct option identifies this type of circuit as one that consists of two ungrounded conductors and one grounded conductor. This configuration is typically used in multi-wire branch circuits where two phases are utilized, providing a balanced load across the circuit and helping to meet the requirements for grounding, which enhances safety and reduces the risk of electrical faults.

This definition is significant because it captures the essential characteristics and functions of a branch circuit, ensuring that electrical systems are safe and effective in delivering power to various devices and appliances throughout a building. In practice, grounding enhances safety by providing a path for fault currents and ensuring that exposed conductive parts do not become energized. Thus, understanding the makeup of a branch circuit is crucial for both compliance with the National Electrical Code and for the safe operation of electrical systems.