The old industrial electrician, Marco, wiped the sweat from his brow with a rag that had seen better decades. Before him, in the bowels of the old Seabright Mill, was a problem wrapped in smoke and silence. The main feed cable for the number-three press had failed. Not just tripped a breaker—failed. The insulation had melted into a black, brittle crust, and the copper inside had turned the color of a bruised plum.
: Different materials have different heat limits. For example, Thermoplastic (PVC) typically has a limit of 70∘C70 raised to the composed with power C , while Thermosetting (XLPE) can handle up to 90∘C90 raised to the composed with power C cable size current carrying capacity
As electricity flows through a wire, it encounters resistance, which generates heat. A cable's size determines how much heat it can dissipate. If the heat generated exceeds the heat dissipated, the insulation will melt. The old industrial electrician, Marco, wiped the sweat