Electrical Wire Sizes (Gauges) For Your Home Defines wire gauge and size for amps, use and current carrying capacity for home and residential applications Basic House Wiring -Connections and Code A careful explanation of basic house wiring The number and gauge of wires that But until I discovered your site I NEVER had a clear grasp on how home wiring Basic Electrical for wiring for house,wire types sizes Romex is used for most lighting and outlet circuits in your home. Romex will be labeled with "12-2" or "12-3". The first number indicates the gauge of the wire.