What does the term "service equipment" refer to?

The term "service equipment" specifically refers to the equipment that delivers electrical energy to a building. This encompasses elements such as the service disconnect switch, meter socket, and panelboard, which are crucial for controlling and managing the electrical service entering a structure. Essentially, service equipment is the point where the electrical utility's supply meets the building's internal electrical distribution system.

In the context of the National Electrical Code (NEC), understanding service equipment is vital for ensuring safe and compliant installations. It plays a fundamental role in the distribution of electricity throughout a building, protecting both equipment and individuals from potential electrical hazards.

The other options focus on components that are not strictly categorized as "service equipment." Circuits that distribute power within a structure fall under the category of branch circuits and do not include the main service connection. The main equipment supplying power to other units typically refers to larger systems or feeders, rather than the direct delivery of service to a building. Backup generators, while important for emergency power supply, do not deliver the main electrical service to a building; rather, they provide supplemental power during outages.