State three methods through which service cables must enter a building.

1. Overhead service entrance: The service cable can enter the building through an overhead service entrance, where the cable is attached to a pole or other structure and then brought into the building through a weatherhead or other approved entrance point.

2. Underground service entrance: The service cable can also enter the building through an underground service entrance, where the cable is buried underground and then brought into the building through a conduit or other approved entrance point.

3. Through a service entrance panel: The service cable can enter the building through a service entrance panel, which is a designated electrical panel or box where the cable is connected to the building's electrical system. The cable is typically brought into the building through a conduit or other approved entrance point and then connected to the service entrance panel for distribution throughout the building.

1. Through a service entrance head or service entrance enclosure
2. Underground through a raceway
3. Directly through a foundation wall