How to Wire a Main Breaker Box | Hunker Disconnect the electricity at the meter loop or the pole.Insert the two main lines from the electrical supply pole into the two terminals at the top of the Plug in the main breaker and move it to the off position. Electrical panel boxes differ some, but Notice the two ground bars on either side of the box. This is where the ground (bare) wires from the See all full list on hunker How to Wire an Electric House Meter | eHow Electric house meters can only be installed by power companies. Homeowners, however, can install the meter base. The electrical meter is part of a meter loop, which also contains a weatherhead and breaker box. Meter loops must be built and installed to specifications set by the power company.