Question:

Why are telephone wires have to be left slack in warm weather?

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  1. Metal expands when it is warm and contracts when it is cold. Wires are installed with just the slack needed to compensate for the expansion and contraction during warm and cold seasons.

    There really isn't a certain amount of slack needed for summer but it is required during winter when the wires will contract. This will prevent excess stress on the poles or towers supporting the wires.

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