Question

Why are the telephone or telegraph wires laid in summer kept slightly loose, while in winter they are tight?

Answer 1

1. The telephone and telegraph wires are metallic wires.
2. The metallic wires undergo thermal expansion in summer and sag down.
3. Then the chances of getting contacted with other wires during the storm and causing a serious breakdown are high.
4. To avoid breakdowns, telephone and telegraph cables are laid loosely to allow contraction in winter.
5. The wires will be laid tightly during winters for allowing them to expand in summer.