At 1.5m (deeper = hotter), factor: 0.96.

Mark: “So we need a cable with base rating of 201A / 0.664 = 303A minimum.”

Per ICEA P-32-382, for 90°C cable in 35°C soil (base rating is 25°C soil): ( k_{temp} = \sqrt{\frac{90 - 35}{90 - 25}} = \sqrt{\frac{55}{65}} = \sqrt{0.846} \approx 0.92 ) Result: The cable can only carry 92% of its base rating.

(ignored for continuous max case—safety first).