Short Circuit Current Formula -

Notice the formula is just Ohm’s Law ((I = V/R)). But instead of pure resistance (R), we use impedance (Z) because AC circuits have inductance and capacitance.

Where:

[ I_SC = \fracFLA%Z_transformer ]

) is calculated using Ohm’s Law. This assumes the only thing limiting the current is the internal resistance of the source and the conductors. Isccap I sub s c end-sub : Short circuit current (Amperes) : Source voltage (Volts) : Total impedance of the circuit path (Ohms) short circuit current formula