[ \Delta V = \frac2 \cdot L \cdot I \cdot \rhoS ]
Cable impedance: =Z_cable_per_km * L / 1000 Total short‑circuit current: =V_n / (SQRT(3) * (Z_transformer + Z_cable)) Circuit breaker rating (I_n) must satisfy: (I_b \le I_n \le I_z) (I_z = cable ampacity) And (I_sc \ge I_instantaneous) for magnetic trip. hoja de calculo excel para instalaciones electricas xls
Conditional formatting highlights when ΔV > 3%. [ \Delta V = \frac2 \cdot L \cdot