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To calculate the derated current-carrying capacity:
A 120mm² copper, XLPE cable (90°C rating) has nominal 400A in free air at 30°C.
A cable at 0.5m depth dissipates heat better than at 1.5m depth. Derating factors for depth are typically small (0.95–0.98 per 0.5m increase) but become significant for long, high-current runs.
Deeper burial means more soil above the cable, which acts as thermal insulation. The earth’s temperature also increases with depth due to geothermal gradient, though for shallow power cables (<2m), ambient ground temperature dominates.
To calculate the derated current-carrying capacity:
A 120mm² copper, XLPE cable (90°C rating) has nominal 400A in free air at 30°C.
A cable at 0.5m depth dissipates heat better than at 1.5m depth. Derating factors for depth are typically small (0.95–0.98 per 0.5m increase) but become significant for long, high-current runs.
Deeper burial means more soil above the cable, which acts as thermal insulation. The earth’s temperature also increases with depth due to geothermal gradient, though for shallow power cables (<2m), ambient ground temperature dominates.
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