What is the main function of a service entrance?

The main function of a service entrance is to connect the electrical supply from the utility to the building’s electrical system. This is the crucial point at which utility power enters a building and is then routed to various circuits within that building. The service entrance typically consists of a service drop or lateral, a meter, a main disconnect switch, and service equipment that includes circuit breakers or fuses.

This connection is fundamental because it establishes the power source for all electrical devices and systems within the building. Without a properly functioning service entrance, the building would not receive any electrical power. The other options, while related to the electrical system in some ways, do not specifically define the primary purpose of the service entrance.