Electric power distribution from powerplant to homes

[Babadag]

By the way, even overhead line presents insulation: the insulators and the air. However, if the heat is evacuated by conduction in cables in the overhead line it is convection and radiation the evacuation way. The conductor temperature is limited by metal mechanical properties since annealing aluminium produces elongation of the conductor and so permanent sag increase. For short-circuit the limit may be the fusing temperature of the conductor. So, the melting point may be the limit.