Calculation For Cable Size [better] May 2026

From cable table – 35 mm² Cu/PVC (ampacity ≈ 135 A) selected.

[ I_b = \frac{50,000}{\sqrt{3} \times 400 \times 0.85 \times 0.9} \approx 94.3\ \text{A} ] calculation for cable size

Short-circuit check: I_sc = 10 kA, t=0.1s, k=143 [ S_{min} = \frac{\sqrt{10000^2 \times 0.1}}{143} = \frac{3162}{143} \approx 22.1\ \text{mm}^2 ] 35 mm² > 22.1 mm² → OK. From cable table – 35 mm² Cu/PVC (ampacity