Lightning Protection Calculator
The Lightning Protection Calculator finds the rolling-sphere radius, air-terminal mesh size, and protection level for a building. Example: for a 40 × 25 × 18 m building protected to LPL III in Manila, Rolling-sphere radius = 45 m, Mesh size = 15 m, Protection efficiency = 90 % (per IEC 62305-1/2/3/4:2010 | NSCP 2015 Vol.3 | PEC 2017 Art.280).
How it works
Computed from your inputs per IEC 62305-1/2/3/4:2010 | NSCP 2015 Vol.3 | PEC 2017 Art.280.
Worked example (Electrical & Power)
Inputs: a 40 × 25 × 18 m building protected to LPL III in Manila.
| Result | Value |
|---|---|
| Rolling-sphere radius | 45 m |
| Mesh size | 15 m |
| Protection efficiency | 90 % |
Computed live by WorkHive's calculation engine; standard: IEC 62305-1/2/3/4:2010 | NSCP 2015 Vol.3 | PEC 2017 Art.280.
How to use this calculator
- Enter the figures for the duty you are sizing: the worked example below uses a 40 × 25 × 18 m building protected to LPL III in Manila.
- The calculator returns Rolling-sphere radius, Mesh size, Protection efficiency, computed per IEC 62305.
- 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 lightning protection rolling sphere calculator?
The Lightning Protection Calculator is a free online tool that computes finds the rolling-sphere radius, air-terminal mesh size, and protection level for a building. 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 62305. 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 Lightning Protection Calculator in WorkHive: free, no sign-up needed for the calculators.