| Ambient Temp | Derating Factor | |--------------|----------------| | 35°C | 0.94 | | 40°C | 0.87 | | 45°C | 0.79 | | 50°C | 0.71 | | 55°C | 0.61 | | 60°C | 0.50 |

Selecting the right cable isn't just about voltage rating and current capacity. The environment where the cable lives often forces us to "derate" its ampacity.

If you are specifying cables for a solar farm, data center, or industrial plant, you need to consult (Electric cables – Calculation of the current rating).