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.
Don't just apply one factor. Multiply them (Temp x Soil x Grouping). If your result is below 0.7, you likely need to upsize the cable.
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).
Here are the you must check in the standard tables:
| 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 |
You can copy, paste, and tweak the bracketed sections to fit your specific project or audience. Headline: Mastering Cable Sizing: The Critical Role of IEC 60287 Derating Factors
