How to Wire a 100 Amp Circuit Breaker Box | Hunker Wiring a 100-amp circuit breaker box can be a challenging task and should involve an electrician's approval regardless of how comfortable you feel with the project. It can be a very dangerous undertaking and must be performed by a professional. How to Wire an Electric Meter - The Spruce But it can still be useful to understand the functioning of the electric meter and the particulars of how it is wired. Anatomy of an Electric Meter. Inside a standard household electric meter box, there is a center neutral bus bar and two hot wire connection points for the incoming (line) and outgoing (load) wires. How Do You Install 100-Amp Service? | Reference A 100-amp main breaker panel receives 100-amp service at 240 volts. Electricity enters the home via the meter socket and service-entrance wire. Two-gauge, three-conductor aluminum SER wire is an appropriate 100-amp service-entrance wire.