General Order 64-A
Section II
Definitions Of Terms Used In This Order
23.2 Wire Gage means a standard of measurement used for convenient nomenclature of the various size of wires.
A. American Wire Gage (AWG) otherwise known as Brown and Sharpe (B&S) for copper, aluminum and other conductors.
B. New British Standard (N.B.S.) for copper aluminum and other conductors.
C. Birmingham Wire Gage (BWG) for iron and steel conductors (used principally for telephone and telegraph conductors).
D. New British Standard (NBS), a wire gage for certain copper, bronze or copper-covered steel conductors (a modification of BWG used principally for telephone conductors).