Which type of circuit is focused on in Article 210 of the NEC?

Article 210 of the National Electrical Code (NEC) specifically addresses branch circuits, which are essential components of electrical systems. Branch circuits are defined as the conductors that connect the final circuit protective device (such as a circuit breaker or fuse) to the outlets, devices, or appliances. This article outlines the requirements for the installation, protection, and sizing of these circuits to ensure safe and reliable operation in residential, commercial, and industrial settings.

The focus on branch circuits is crucial because they are the circuits that directly supply power to various electrical loads like lighting, receptacles, and other equipment. Understanding their design and compliance with NEC standards helps prevent overloading, minimizes the risk of fire hazards, and ensures the safety and functionality of electrical systems.

Other options mentioned, such as special purpose circuits, service entrance circuits, and feeder circuits, have their own specifications within the NEC but are not the primary focus of Article 210. Special purpose circuits pertain to specific applications, service entrance circuits deal with the introduction of electrical supply from the utility to a building, and feeder circuits link branch circuits to the service equipment but are independent of the specific regulations that Article 210 outlines.