Question

why do electric wires sag in summer?

Answer 1

Here's ur answer =>
The lines are often heavily loaded because of increased power consumption, and the conductors, which are generally made of copper or aluminum, expand when heated.
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Answer 2

Answer:

Electric cables fixed between poles expand due to heat during the daytime and sag more; the cables contract and sag less during the night when they cool down. Hence, cables are not pulled too tight when they are fixed, to allow for contraction.

Explanation:

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