Why overhead electric cables sag on hot sunny days?

Answer 1

There's little choice. Conductors (not 'cables') sag, because of their weight. However, there's also a practical reason for deliberately allowing conductors to sag; if they were too 'tight', then they would not be able to contract during cold weather without pulling the poles over.

Answer 2

Overhead electric cables sag on hot sunny days because the heat causes the metal conductors to expand and become longer, leading to sagging. This increased length of the cables results in a lower tension in the lines and causes them to droop. Cooling mechanisms, such as spacer bars or special materials that expand less with heat, help prevent excessive sagging.

Answer 3

because the wires cannot withstand the load

Answer 4

this is because,during sunny days, the heat from the sun causes the cable to expand, in the expansion the cables then sag