why are telephone wires and electric wires left sagging between two poles ??????
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It is so because during winter the wires will contract and get shorten thus in order to prevent them from breaking apart they are left sagging or if they were tightly fixed between the poles then during winter the wires will contract and it will cause them to break apart.
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The telephone wires will sag in summer due to expansions. While putting up the wires between the pole care is taken care in winter they are kept light so that they may not sag too much. ... So telephone wires will sag in summer due to expansion while you do suspect because of because of because of sighing expansion.
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