Electrician's Licensing Practice Exam

How does NEC Article 100 define a "Feeder"?

1. All circuit conductors to the branch circuit

2. All circuit conductors from the service equipment to branch circuit devices

3. All circuit conductors between service equipment and final branch-circuit overcurrent device

4. All conductors that connect to the utility service

The correct answer is: All circuit conductors between service equipment and final branch-circuit overcurrent device

The definition of a "Feeder" according to NEC Article 100 specifically refers to all circuit conductors that run between the service equipment and the final branch-circuit overcurrent device. This definition highlights the role of feeders in the electrical distribution system, where they serve to transport electrical power from the main service panel or other distribution points to the devices that ultimately deliver that power to branch circuits. In this context, it is important to note that feeders do not include the final branch-circuit conductors themselves. Instead, feeders typically consist of larger conductors that are designed to handle the power load before it is distributed to smaller branch circuits. This distinction is fundamental in understanding electrical systems, as each component—service equipment, feeders, and branch circuits—has a specific function within the system. The other options fail to accurately convey this distinction. They either broaden or misrepresent the scope of what constitutes a feeder, mixing its role with that of other components such as branch circuits or service connections. Understanding this definition is crucial for anyone preparing for electrical licensing exams, as it forms the basis for further study into load calculations, circuit design, and overall electrical safety standards.