Formula - Short Circuit Current

| Situation | Rule | |-----------|------| | | Short circuit current = FLA × (100 / %Z) | | Long wires | Impedance dominates — recalculate every 50 ft | | Parallel conductors | Doubles the short circuit current (impedance halves) |

These formulas may vary depending on the context, such as the type of short circuit (single line-to-ground, line-to-line, three-phase), the system (AC or DC), and the available data. short circuit current formula