Why do you think electric wires are left sagging between poles, rather than being stretched tight?
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Answer:
When we talk on the sagging of electric wire on poles than being stretched tight. Tension of the wire. Each wire lines are often heavily loaded because of increased increase consumption, and the conductors, which are generally made of copper or aluminum, expand when heated.
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solids expand during summer and contract during winter. since the the electric wires are left sagging between the poles during winter the contract and become stretched and expand during summer.
if the wires are stretched during summer they will contract during winter which may lead in the tearing of the wire.
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