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 safely carry 60 Amps in these real conditions. It is entirely insufficient for a 150A load.
3,500m altitude: $K_alt \approx 0.92$
We must select a larger base cable. Iterate until $I_actual > 150A$.
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 safely carry 60 Amps in these real conditions. It is entirely insufficient for a 150A load. cable rating and derating factor
3,500m altitude: $K_alt \approx 0.92$
We must select a larger base cable. Iterate until $I_actual > 150A$. Correction factors for buried cables: | Soil Resistivity
