What defines the term 'service equipment' in electrical systems?

The term 'service equipment' in electrical systems primarily refers to the main disconnect switch for a building's electrical system. This equipment is crucial as it serves as the point where the electrical service enters a building and is responsible for disconnecting all electrical circuits within that building from the utility supply.

Service equipment typically includes the main circuit breaker or switch and the panelboard that distributes electricity throughout the various circuits in the structure. This equipment is designed not only to allow for the disconnection of power for safety and maintenance but also to manage the distribution of electrical power in accordance with relevant codes and regulations.

The other options represent different electrical components or equipment but do not define 'service equipment'. For instance, a device to measure power consumption is known as a meter, while equipment used for construction does not pertain specifically to electrical systems. Generators serve as a backup power source but are not considered part of the service equipment. Therefore, the main disconnect serves a distinct and critical role in the electrical service setup.