Short Circuit Calculator
The Short Circuit Calculator finds the prospective fault current (kA) and peak at a board from the transformer and cable impedance. Example: for a 1000 kVA 5%-impedance transformer feeding a 400 V board via 30 m of 240 mm² cable, 3-phase fault = 21.05 kA, Peak = 39.22 kA, Fault level = 14.58 MVA (per IEC 60909-0:2016 | PEC 2017 Art.2.40 | IEEE 141 | IEEE 242).
How it works
Computed from your inputs per IEC 60909-0:2016 | PEC 2017 Art.2.40 | IEEE 141 | IEEE 242.
Worked example (Electrical & Power)
Inputs: a 1000 kVA 5%-impedance transformer feeding a 400 V board via 30 m of 240 mm² cable.
| Result | Value |
|---|---|
| 3-phase fault | 21.05 kA |
| Peak | 39.22 kA |
| Fault level | 14.58 MVA |
Computed live by WorkHive's calculation engine; standard: IEC 60909-0:2016 | PEC 2017 Art.2.40 | IEEE 141 | IEEE 242.
How to use this calculator
- Enter the figures for the duty you are sizing: the worked example below uses a 1000 kVA 5%-impedance transformer feeding a 400 V board via 30 m of 240 mm² cable.
- The calculator returns 3-phase fault, Peak, Fault level, computed per IEC 60909-0:2016.
- Check the worked example to confirm the method matches how you would do it by hand, then run your own numbers in the interactive tool.
FAQ
What is a short circuit fault current calculator kA?
The Short Circuit Calculator is a free online tool that computes finds the prospective fault current (kA) and peak at a board from the transformer and cable impedance. It shows the formula and a fully worked example so you can check the method, not just the number.
How is it calculated?
The result is computed from your inputs following IEC 60909-0:2016. The worked example on this page shows a real computation with real numbers.
Is the calculator free?
Yes. WorkHive's engineering calculators are free to use, no sign-up needed for the tools. WorkHive is a free, offline-first maintenance platform built for Philippine industrial plants.
Run it on your own numbers
Open the interactive Short Circuit Calculator in WorkHive: free, no sign-up needed for the calculators.