Cable derating is the intentional reduction of a continuous current-carrying capacity (ampacity) of an electrical conductor. National electrical codes define base ampacity under ideal, isolated conditions. Real-world installations introduce external thermal stresses. Failure to derate cables leads to insulation degradation, short circuits, and catastrophic electrical fires. 🔌 Why Cable Derating is Critical
This turns a normally dormant neutral into a heavily loaded, heat-generating conductor. 4. Underground Installation Depth and Soil Resistivity Soil acts as an insulator against heat dissipation. Deeply buried conduits retain more heat than shallow ones. cable derating