What is the difference between a service entrance and a subpanel?

A service entrance and a subpanel serve different functions in an electrical system. The service entrance is the point where electrical power from the utility company enters a building. It typically includes the main service disconnect, overcurrent protection devices, and the main distribution panel. This is where power is first received and typically involves a higher capacity to handle the incoming electricity.

On the other hand, a subpanel functions as an extension of the main panel. It does not receive power directly from the utility but instead draws power from the main service panel. A subpanel is used to distribute electricity to different areas or circuits of a building, allowing for better management of the electrical system in terms of load distribution and adding additional circuits without the need to upgrade the main service panel.

This distinction clarifies the roles of each component: the service entrance serves as the entry point for electricity, while the subpanel redistributes that electricity to various parts of the home or building.