Medium Voltage Cable Sizing Calculator May 2026

Elena taps the screen. “Mark: A cable rated for 300A in free air can only carry 199A in our trench.”

(ignored for continuous max case—safety first). medium voltage cable sizing calculator

As a percentage: ( 719 / 34,500 \approx 2.08% ) – Acceptable (limit 5%). Elena taps the screen

( 0.92 \times 0.88 \times 0.96 \times 0.90 \times 0.95 = 0.664 ) It applies six correction factors sequentially

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

Elena stops him. “You forgot the derates.” A true MV calculator doesn’t just do Ohm’s law. It applies six correction factors sequentially.

( V_{drop} = \sqrt{3} \times I \times (R \cos\theta + X \sin\theta) \times L ) For 1/0 AWG copper: R=0.124 Ω/1000ft, X=0.048 Ω/1000ft, power factor 0.85. Length: 15,840 ft. ( V_{drop} \approx 1.73 \times 201 \times (0.124×0.85 + 0.048×0.53) \times 15.84 ) ( \approx 347 \times (0.1054 + 0.0254) \times 15.84 ) ( \approx 347 \times 0.1308 \times 15.84 \approx 719 ) volts.