This calculator follows IEC 60364 standards and is suitable for domestic, commercial, and industrial electrical installations.
Where:
# Maximum Zs for 20A MCB Type C (5x rating for instant trip) max_zs = 230 / (5 * 20) # 2.3 ohms max_length = (max_zs - 0.15) / r_per_m # subtract source impedance fault loop calculator
The fundamental equation used by these calculators is derived from Ohm’s Law: This calculator follows IEC 60364 standards and is
Note: $R_1$ is the resistance of the phase conductor, and $R_2$ is the resistance of the protective conductor. Calculators adjust these resistances based on temperature (cold vs. operating temperature). fault loop calculator