From above example: Need → select 6 mm² (36A in conduit is too low; 48A in air OK) or 10 mm² for conduit.
Is this for a (home) or three-phase (industrial) system? electrical cable size calculations
[ VD = \frac2 \times L \times I \times (R \cos\phi + X \sin\phi)1000 \quad (\textvolts) ] Formula (three-phase): [ VD = \frac\sqrt3 \times L \times I \times (R \cos\phi + X \sin\phi)1000 ] From above example: Need → select 6 mm²