Neutral Earth Fault Current - Design Calculators

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Neutral Earth Fault Current Calculator

This calculator determines the neutral earth fault current for three common earthing systems: Solidly Earthed, Resistive Earthed, and Isolated/Unearthed systems. Accurate calculation of earth fault currents is crucial for the proper design of earthing systems, selection of protective devices, and ensuring safety in electrical installations. This tool adheres to fundamental principles outlined in international standards such as **IEC 60364 (Low-voltage electrical installations)**, **IEEE Std 80 (Guide for Safety in AC Substation Grounding)**, and **IEEE Std 141 (Recommended Practice for Electric Power Distribution for Industrial Plants - Red Book)**.

Earthing System Type

System Line-to-Line Voltage (V)

Source Zero-Sequence Resistance (R0,source in Ω)

Source Zero-Sequence Reactance (X0,source in Ω)

Neutral Earthing Resistance (RN in Ω)

Source Zero-Sequence Resistance (R0,source in Ω)

Source Zero-Sequence Reactance (X0,source in Ω)

Total System Capacitance to Earth (Ct in μF)

System Frequency (Hz)

Calculation Results

Parameter	Value