3.4. Conductor Material
Electric power conductors are generally of the following materials: Copper, aluminium and steel or some combination of these three metals. In some cases special alloys have been used. From a conductivity point of view, copper is the best conductor material, aluminium being second, and steel last. Commercial conductors are made in several forms, namely:
(i) Solid hard-drawn copper
(ii) Stranded copper
(iii) Hollow copper conductor, stranded
(iv) Hollow copper conductor, segmental
(v) Copperweld copper
(vi) Aluminium stranded, steel cored.