1.1 This specification covers bare concentric-lay-stranded conductors made from round copper wires, either uncoated or coated with tin, lead, or lead alloy for general use for electrical purposes. These conductors shall be constructed with a central core surrounded by one or more layers of helically laid wires.

1.2 For the purposes of this specification, conductors are classified as follows (Explanatory Notes 1 and 2):

1.2.1 Class AA -For bare conductors usually used in overhead lines.

1.2.2 Class A -For conductors to be covered with weather-resistant (weather-proof), slow-burning, materials, and for bare conductors where greater flexibility than is afforded by Class AA is required.

1.2.3 Class B -For conductors to be insulated with various materials such as rubber, paper, varnished cloth, etc., and for the conductors indicated under Class A where greater flexibility is required.

1.2.4 Class C and Class D -For conductors where greater flexibility is required than is provided by Class B conductors.

1.3 The SI values for density are regarded as the standard. For all other properties, the inch-pound values are to be regarded as standard and the SI units may be approximate.