Ampacity Chart, With the Derating Chain Left Visible

Field notes

The site organizes conductor sizing around the sequence electricians actually need to check: base ampacity, insulation temperature column, ambient correction, bundling, termination limits, and overcurrent protection. Its tables cover copper and aluminum through 2000 kcmil, while separate sections address cables such as SER, DLO, welding cable, tray cable, and SOOW. The page reports 171 grid positions checked against NFPA 70 and 78,492 property-test inputs, though those claims are not independently verified in the extract.