What is the purpose of a service entrance in an electrical system?

The purpose of a service entrance in an electrical system is to connect the utility supply to the building's distribution panel. This connection is crucial as it serves as the point where electricity from the utility company enters the building’s electrical system. The service entrance typically includes components such as the meter, main disconnect switch, and the necessary circuit breakers that facilitate the distribution of electrical energy throughout the building. It ensures that power is safely directed to the main panel, where it can then be distributed to various circuits for lighting, appliances, and other electrical devices within the structure.

In contrast, measuring total electrical consumption typically occurs at the utility meter, not specifically at the service entrance. Providing an emergency disconnect facility is a function of the main disconnect switch but does not encapsulate the overall purpose of the service entrance itself. Regulating power supply levels would involve devices such as transformers or regulators, which perform different roles within the electrical system.