Results
Enter inputs above, then tap Calculate.
Method and assumptions
Thevenin equivalent at POC - ignores motor contribution and X/R.
Prospective fault level
Estimate prospective fault current from voltage and source impedance.
Simplified prospective fault-current estimate from voltage and source impedance. Does not establish device breaking capacity or a full fault study.
Related calculators
Check the stated method and limits against your installation. Results are calculation aids, not certification.
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Calculation model 2026-11-02.1