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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.

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8y ago
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13y ago

because the wires cannot withstand the load

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10y ago

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

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Q: Why overhead electric cables sag on hot sunny days?
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