Why are telephone wires left slack in the summer?

Answer 1

Bofore the question can be answered, it needs to be properly rephrased.

The question contains a grammar error that is all too frequent these days... non-agreement with the subject in number (singular or plural). We need to be more careful of such simple grammar slip-ups. Poor grammar betrays a lack of education and an imprecision of thought.

Correction: Why are telephone wires left slack?

This error is creeping into speech today...from even the news anchors... through the contraction of "is" following the word "there", e.g. "there's too many jobs being lost...".

Correction: There are too many jobs being lost...

Answer 2

They're hung loosely, partly because the weight of the cable and partly because the cable expands during the warmer summer months. The bow in the wires is less noticeable in winter when the wires contract with the cold.

Answer 3

If the telephone wires were strung taut, the lines would snap when the air cooled. Cool air (or ice) causes metal to contract.

Answer 4

In the winter they grow shorter because of the cold, so they make them longer

Answer 5

As metal contract in cold temperature. In winters it will contract and become tight and straight. But if they are already tight and straight, so while contracting in winters it will break down due to so much contraction. That is why they ere hung loosely.