Along wires. Copper wires underground or aluminium overhead.
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The copper wires used connect. Because conductivity of Cooper
higher than aluminium but price of Cooper higher than aluminum. If
compare between copper and aluminium cable can see at the same
current rate diameter of aluminium cable is larger than copper
cable.
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Its light weight and resistnace to coorsion are important
factors. The use worldwide differs. Aluminium alloy, coated
aluminium wire are used. In the UK aluminium is not recommended for
domestic use.
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Copper is frequently used for electrical wires. Aluminium is cheaper but breakable.