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The power transmission lines are loose on electric poles and transmission towers just to allow the vibrations and to prevent breaking of conductors in mechanical shocks.
During transmission of electricity, heat is being dissipated. The heat generated by cables is being minimized via high voltage transmission. The effect of weather and the internal temperature of the cable make it necessary to let the cables a little bit loose.
If the cables were made tight and the weather gets cold, it would cause the transmitting cables to contract thereby creating more tension in the cables which might cause it to cut. So, the cables are loose so that even if contraction should occur, there won’t be much tension which would lead to the damage of the cables.
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