// FREE CALCULATORS
Short Circuit Current (MVA Method)
Estimate three-phase, line-to-line, and line-to-ground fault currents at the transformer secondary or end of a cable run. NEC/ANSI and IEC 60909 reference.
// INPUTS
// SOURCE / UTILITY
Ask the utility for the available fault level. If unknown, assume a high value: an infinite bus is the conservative case for equipment ratings
// TRANSFORMER
Typically 5–6% for distribution transformers
// CABLE IMPEDANCE (optional)
Transformer MVA (short circuit)
-MVA
System Short Circuit MVA
-MVA
3-Phase Fault Current (Isc)
-kA
Line-to-Line Fault Current
-kA
Line-to-Ground Fault (approx)
-kA
Disclaimer: For reference and preliminary estimation only. Verify results against the applicable code, project specification, and equipment data before use in design documents. Found an error or an outdated reference? Let us know at [email protected].
Please check inputs, all values must be positive.