3,500m altitude: $K_alt \approx 0.92$
$I_actual = 185A \times 0.71 \times 0.50 \times 0.92$ $I_actual = 185A \times 0.326$ $I_actual = 60.3A$ cable rating and derating factor
This guide delves deep into the science, standards (IEC, NEC, BS), and practical application of cable rating and derating factors. What is Ampacity? Ampacity is defined as the maximum current, in amperes, that a conductor can carry continuously under specified conditions without exceeding its temperature rating. 3,500m altitude: $K_alt \approx 0
12 current-carrying conductors in bundle: $K_group = 0.50$ (NEC 10-20 conductors) cable rating and derating factor
Derate by 1% to 2% per 300 meters above 2,000m.