Lightning Protection Calculator
Static · formula-only · worked example computed when this page was built · no live data
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. 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 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 by WorkHive's calculation engine when this page was built; standard: IEC 62305-1/2/3/4:2010 | NSCP 2015 Vol.3 | PEC 2017 Art.280.
How to use this calculator
- Read the worked example. It uses a 40 × 25 × 18 m building protected to LPL III in Manila and shows every number in the method.
- Follow the formula with your own figures: it returns Rolling-sphere radius, Mesh size, Protection efficiency, computed per IEC 62305.
- To compute interactively, open the Lightning Protection Calculator inside WorkHive's free Engineering Design suite (link below). It runs the same method with your inputs.
FAQ
What is a lightning protection rolling sphere calculator?
The Lightning Protection Calculator is a free online tool that 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 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 Lightning Protection Calculator in WorkHive. Free, and a free sign-up saves your calculations, BOMs and scope-of-works to your account.