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Both calculators run independently — change the inputs on either side to compare results.

Short Circuit Current Calculator

Calculate the available short-circuit fault current at any point in a three-phase electrical system, accounting for transformer impedance and cable length. Use this for sizing breakers, fuses, and switchgear to meet NEC and ANSI interrupt ratings.

System Voltage

Transformer KVA (kVA)

Transformer Impedance (%)

Cable Length to Fault (ft)

Fill in the required fields to see your result.

Electrical

Short Circuit Current Calculator

Compute the available short-circuit current (ASCC) at a fault point downstream of a transformer, accounting for transformer impedance and cable impedance to the fault location. Use this to verify that breakers and fuses have a sufficient interrupting rating.

Transformer Size (kVA)

Transformer Impedance (%)

System Voltage

Cable Length to Fault (ft)

Cable Size (AWG/kcmil)

Fill in the required fields to see your result.

Key differences

	Short Circuit Current Calculator	Short Circuit Current Calculator
Category	Electrical	Electrical
Inputs required	4	5
Result	Short Circuit Current (A)	Short Circuit Current (A)
What it does	Calculate the available short-circuit fault current at any point in a three-phase electrical system, accounting for transformer impedance and cable length. Use this for sizing breakers, fuses, and switchgear to meet NEC and ANSI interrupt ratings.	Compute the available short-circuit current (ASCC) at a fault point downstream of a transformer, accounting for transformer impedance and cable impedance to the fault location. Use this to verify that breakers and fuses have a sufficient interrupting rating.