Wire Derating [patched] Jun 2026

| Ambient Temp (°C) | 60°C wire | 75°C wire | 90°C wire | |------------------|-----------|-----------|-----------| | 21–25 | 1.00 | 1.00 | 1.00 | | 26–30 | 0.91 | 0.94 | 0.96 | | 31–35 | 0.82 | 0.88 | 0.91 | | 36–40 | 0.71 | 0.82 | 0.87 | | 41–45 | 0.58 | 0.75 | 0.82 | | 46–50 | 0.41 | 0.67 | 0.76 |

There are two primary scenarios where you must derate a wire: and Bundling (Conduit Fill). wire derating

Suddenly, that "simple" math gets complicated. If you ignore the rules of , you risk nuisance tripping, melted insulation, or even an electrical fire. | Ambient Temp (°C) | 60°C wire |