Electrical Wiring: Types of Insulated Wires, Flexible Cord and Flexible Cable
Wires are of two groups- (i) ordinary wires and (ii) cables. For electric work conductors are usually made of copper but aluminium conductors are also used mainly because of its low cost. In India a large quantity of copper is imported from other countries. Presently the armature and field coils of different machines and instruments are also made of aluminium [...]