Electrical Cable Size Calculation Work Info

10 mm² → 72 A → meets 66.4 A requirement.

Temp 35°C: factor 0.96 (XLPE) Grouping 4 circuits: factor 0.80 Required ampacity = 51 / (0.96 × 0.80) = 66.4 A electrical cable size calculation

I = 30,000 / (√3 × 400 × 0.85) = 51 A 10 mm² → 72 A → meets 66

Vd per km for 10 mm² copper (from table) ≈ 3.8 V/A/km (3-phase) Vd = 3.8 × 51 × 0.15 = %Vd = 29.1 / 400 = 7.3% – exceeds 5% limit → increase size . electrical cable size calculation

Using simplified: Vd = (1.732 × 51 × 0.15 × 0.0175 × 1.2) / 10 = (0.278) / 10 = 0.0278 V per A per m? Let's recalc properly: