1.1 This specification covers nickel-coated, soft or annealed, round copper wire for use in electrical equipment. 1.2 Five classes of wire are covered as follows: 1.2.1 This specification covers nickel-coated, soft or annealed, round copper wire for use in electrical equipment. Five classes of wire are covered as follows: Class 2, Class 4, Class 7, Class 10, and Class 27. Properties like elongation, resistivity and di