Copper, aluminium and aluminium alloys are common materials. For electrical conductors, the copper has to be 99.9% pure and the aluminium must be at least 99.5% pure. Alloys have slightly lower purity as other composite metals are added for tensile strength. Aluminium are more commonly used for aerial and overheads due to it being lighter than copper, while alloys are mostly used as messenger wires.

 

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