ASTM B566-93(2002) PDF

1.1 This specification covers bare round copper-clad aluminum wire for electrical applications.

1.2 Four classes of copper-clad aluminum wire are covered as follows:
Class 10A - Nominal 10 volume % copper, annealed.
Class 15A - Nominal 15 volume % copper, annealed.
Class 10H - Nominal 10 volume % copper, hard-drawn.
Class 15H - Nominal 15 volume % copper, hard-drawn.

1.3 The values stated in inch-pound units are to be regarded as the standard, except for resistivity and density, where the SI units are the standard. The values given in parentheses are for information only.