- Hard Drawn Copper conductors:-
- Copper for overhead line is hard drawn to give a relatively high tensile strength.
- Copper has a high electrical conductivity , long life and has also high scrap value.
- Copper conductor is most suitable for distribution work where spans are short and tapping are more.
- Cadmium Copper Conductors:-
- The tensile strength of copper is increased by adding small amount of cadmium to it.
- The conductivity is reduced by 15% to 17%.
- The conductor is easy jointing, more resistance to atmospheric corrosion and better resistance to wear.
- Steel Core Copper Conductors:-
- When one or more layer of copper strands surround a steel core then it is called steel core copper conductor
- The steel core increase the tensile strength of the conductor.
- The core is provided with bituminised cotton tape to protect the conductor from the galvanic action.
- Copper Weld Conductors:-
- Copper is welded on to a steel wire by hot rolling and cold drawing a billet of steel coated with copper.
- The conductivity of weld copper conductor is varies from 30% to 60% of that a solid copper conductor with same diameter.
- The conductivity is standard grade is about 40%.
