If PF not known, assume 0.8 for motors, 0.95 for lighting/heating.
Flexible cables often used in industrial control settings. Summary Checklist Calculate the Load Amps . Pick a Circuit Breaker higher than the load. Divide the breaker rating by Environmental Factors . Match that number to a Standard Cable Size in a chart. electrical cable size calculations
10 kW, 3-phase, 400V, PF=0.86, L=120m, installation in conduit, 35°C ambient, 4 cables grouped, copper/PVC. If PF not known, assume 0