Cable Rating And Derating Factor ◉

The 50mm² cable rated for 185A can only safely carry 60 Amps in these real conditions. It is entirely insufficient for a 150A load.

While a cable might theoretically carry 100 Amps in a perfect, lab-controlled environment, real-world conditions—heat, sunlight, bundling, and altitude—force us to reduce that capacity. This process is called . cable rating and derating factor

Correction factors for buried cables: | Soil Resistivity (K·m/W) | Correction Factor | | :--- | :--- | | 0.7 (Wet, marsh) | 1.05 – 1.10 | | 1.0 (Moist loam) | 1.00 | | 1.5 (Dry sand) | 0.85 | | 2.0 (Very dry gravel) | 0.70 | | 3.0 (Thermal backfill required) | 0.50 | The 50mm² cable rated for 185A can only

– Number of current-carrying conductors in a raceway or cable: | Number of Conductors | Derating Factor | | :--- | :--- | | 1 – 3 | 1.00 | | 4 – 6 | 0.80 | | 7 – 9 | 0.70 | | 10 – 20 | 0.50 | | 21 – 30 | 0.45 | | > 30 | 0.40 | This process is called