Residential Electrical 

  Electricity is generated at power plants and delivered through a network of substations and transformers. Before reaching your home, the voltage is stepped down by a transformer into single-phase alternating current (AC).

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  From the meter base, three conductors enter your main electrical panel: one neutral wire, one ground wire, and two hot wires. Each hot wire provides 120 volts AC, and together they supply 240 volts AC.

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  Inside the main electrical panel, there is (depending on the panel manufacturer) a main disconnect and multiple circuit breakers that feed the branch circuits throughout the house. These breakers connect to the panel’s bus bars, and the circuit wiring is landed on the breakers.

The most common residential wiring sizes are 14/2, 12/2, and 10/2 cable.