Which component is typically found in the service entrance of a building?

The main electrical breaker is a crucial component found in the service entrance of a building because it serves as the primary means of disconnecting power to the entire electrical system. Located at the point where electricity enters the building, the main breaker protects the wiring and components upstream by limiting the current and preventing overloads. It can be used to turn off the power supply for maintenance, repairs, or emergency situations, providing safety for both electrical workers and the building occupants.

The main electrical breaker ensures that the electrical service is safely managed and is typically required by building codes to be easily accessible. It acts as a central control point for the entire electrical system, which is why it is located at the service entrance rather than at other points in the electrical setup, such as light switches or outlets.