What does service equipment typically contain?

Service equipment primarily serves the purpose of providing safe and reliable distribution of electrical power to a building or facility. The correct option highlights that service equipment typically contains a circuit breaker or switch along with associated accessories. These components are essential as they protect electrical circuits from overload or fault conditions, ensuring safety and functionality.

Circuit breakers or switches act as the main control points for electrical systems, allowing users to turn on or off circuits as needed and providing critical protection against electrical faults. Accessories may include fuses, conductors, and protective devices that complement the main components, making them vital for the effective operation of the electrical service.

While the other choices mention various elements related to electrical infrastructure or safety, they do not encapsulate the fundamental components specifically found within service equipment. Power generation and storage units, for example, are part of a larger energy system but not typically part of service equipment. Similarly, emergency lighting, external security, and outdoor lighting systems, while important, are not central to service equipment itself.