Electrical Cable Size Calculations Online

Cables don't exist in a vacuum. You must adjust the "Current Carrying Capacity" ( Itcap I sub t ) based on where the cable is installed: Cacap C sub a

Always use the most restrictive installation method. electrical cable size calculations

[ VD \approx \frac\textmV/A/m \times I \times L1000 \quad (\textvolts) ] where mV/A/m is from cable manufacturer (e.g., 6 mm² Cu = ~7.3 mV/A/m for 3-phase). Cables don't exist in a vacuum

k₁ (35°C) = 0.94, k₂ (4 cables) = 0.70 ( I_\textmin = 16.8 / (0.94×0.70) = 25.5 A ) installation in conduit

Common factors:

10 kW, 3-phase, 400V, PF=0.86, L=120m, installation in conduit, 35°C ambient, 4 cables grouped, copper/PVC.