Discussion
Earth wire is made up of which of the following materials ?
Answer: A
The earth wire is made of galvanized steel.
The earth (ground) wire runs along the tower tops above the phase conductors to shield them from lightning, and it also earths the towers. It carries no load current, so conductivity matters little, while strength over long spans and resistance to corrosion matter a great deal. Galvanized (zinc-coated) stranded steel is strong, cheap and rust resistant.
Copper and aluminium are good conductors but costly and weaker for this duty, and plain iron would rust quickly in the open.
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