Household wiring size inspectapediaImage: inspectapediaTypical household wiring is AWG American wire gauge American wire gauge (AWG), also known as the Brown & Sharpe wire gauge, is a standardized wire gauge system used since 1857 predominantly in North America for the diameters of round, solid, nonferrous, electrically conducting wire. Dimensions of the wires are given in ASTM standard B 258. The cross-sectional area of each gauge is an important factor for determining its current-carrying capacity.enpedianumber 12 or 14. Telephone wire is usually 22,24,or 26. The higher the gauge number,the smaller the diameter and the thinner the wire. American wire gauge definition of American wire gauge in the Was this helpful?