Question

why do electric wires sag between poles on a hot day​

Answer 1

As we know that metals expand in heat and shrink in cold temperatures. So, during summer the rising temperature makes the copper in the wire expand - so it gets sagged. but, during winter, the scenario is completely reverse and the copper contracts and so the wire becomes tight.

Answer 2

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. That expansion increases the between transmission line structures, causing them to