Electrical Cable Sizing Calculation May 2026

If voltage drop exceeds limit, increase cable size. Minimum cross-section for short-circuit:

[ A_min = \fracI_sc \cdot \sqrttk ]

[ I_0 \geq I_z ] [ \Delta U = \sqrt3 \cdot I_b \cdot L \cdot (R\cos\phi + X\sin\phi) \quad \text(3-phase) ] electrical cable sizing calculation