Short Circuit Calculator
Static · formula-only · worked example computed when this page was built · no live data
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, from a 250 MVA source, 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. Anything the worked example does not state uses this calculator's standard default; the interactive version shows every input and lets you change it.
Worked example (Electrical & Power)
Inputs: a 1000 kVA 5%-impedance transformer feeding a 400 V board via 30 m of 240 mm² cable, from a 250 MVA source.
| Result | Value |
|---|---|
| 3-phase fault | 21.05 kA |
| Peak | 39.22 kA |
| Fault level | 14.58 MVA |
Computed by WorkHive's calculation engine when this page was built; standard: IEC 60909-0:2016 | PEC 2017 Art.2.40 | IEEE 141 | IEEE 242.
How to use this calculator
- Read the worked example. It uses a 1000 kVA 5%-impedance transformer feeding a 400 V board via 30 m of 240 mm² cable, from a 250 MVA source and shows every number in the method.
- Follow the formula with your own figures: it returns 3-phase fault, Peak, Fault level, computed per IEC 60909-0:2016.
- To compute interactively, open the Short Circuit Calculator inside WorkHive's free Engineering Design suite (link below). It runs the same method with your inputs.
FAQ
What is a short circuit fault current calculator kA?
The Short Circuit Calculator is a free online tool that 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 is free: this worked example is open to everyone, and the interactive calculator runs inside the free Engineering Design suite after a free sign-up (your work is saved to your account). 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, and a free sign-up saves your calculations, BOMs and scope-of-works to your account.