What is the purpose of a service entrance?

The purpose of a service entrance is to provide a point where power enters a building’s electrical system. This is a critical component of a building's electrical infrastructure, as it marks the transition from the utility company’s distribution network to the internal wiring of the building. It typically consists of various components, such as the main disconnect switch, circuit breakers, and meters, all facilitating the safe and efficient delivery of electrical power.

Understanding the service entrance is vital for anyone working with electrical systems, as it not only connects the building to the grid but also serves as a critical point for protection and control throughout the electrical system. It ensures that the electrical service is safely routed into the building, where it can then be distributed as needed to various circuits and appliances.