The National Electrical Code requires electrical services to have a service entrance panel commonly called a breaker or fuse box. A modern service entrance panel consists of an enclosure housing the breakers or fuses and associated wiring. If located outside, the enclosure must be weatherproof which keeps rain and moisture from interfering with the electrical parts. The breakers or fuses protect the wires leaving the breaker box from overloading and being damaged.
A ground wire connects inside the service entrance panel to the neutral connections to provide a ground for the customer's service. The ground wire extends to below ground level where it attaches to a ground rod. The ground rod serves as an easy path for lightning to get into the earth if it strikes the utility line or the customers electrical service.