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IEC 62305-2 · Ed. 3.0:2024 · lightning risk

Lightning risk assessment, without the spreadsheet.

Enter the structure, its service lines and risk zones. Voltbench walks the current 2024 edition of the IEC 62305-2 risk procedure and judges every zone against the tolerable limit — each factor resolved from its table, with the citation next to it.

Start assessing — free → Read a full sample report ↗

The wizard and on-screen verdict are free. One payment unlocks this study's documents, and every reissue of them.

One stage of one building model — see how the studies fit together →

Risk R — Zone 3 (archive)

Protection required
Computed R
3.6×10⁻⁴
Tolerable RT
1.0×10⁻⁵
R total
RT limit
R_B2
R_V2
R_B1
Exceeds RT — 36× over Component share Tolerable limit

Illustrative sample — real figures come from the validated engine. Total-risk bar is log-scaled (10⁻⁶–10⁻³); component bars show relative share.

The current edition, checkable

Built on IEC 62305-2 Ed. 3.0:2024 — not the withdrawn 2010 edition — and validated against worked references. Every factor shows its table citation and every dropdown its coefficient, so nothing is a black box.

How it's validated →

Minutes, not hours

Building archetypes and zone templates prefill typical values, the satellite map suggests the site's lightning density, and a live preview recomputes the risk as you type.

Report you can hand over

The full report carries the working an engineer signs off on — resolved factor tables with citations, the step-by-step calculation trace, and the projected outcome with measures — as a printable document and PDF.

How it works

1

Describe the site & structure

2

Add service lines & risk zones

3

Every zone judged against RT

4

Unlock the clause-referenced report

Free to assess. Pay for the document you issue.

Run the full wizard and read your on-screen result — the verdict, each zone's risk against RT, the recommended protection measures and the projection showing they bring you under the limit — at no cost. One payment unlocks the full clause-referenced report (every resolved factor with its table citation, the calculation trace, the post-measure factor tables) as a printable document and PDF — for this study, however many times you recompute and reissue it.

📄 Read a full sample report ↗ 🔍 How it's validated
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IEC 62305 · Ed. 3.0:2024

Part of one building model

One building. Three studies. One document. This study is one stage of it: describe the building once, and every part of IEC 62305 runs against the same model — live in 2D and 3D.

The protection level from Part 2 floors the Part 3 design; both feed the Part 4 schedule. Inherited values carry their source, a weaker choice is refused, a departure is printed as a departure — and an input changed after a study computed flags that study stale.

🛡️ LPS Design → 🔻 SPM Design → How the studies fit together → The model →
The Voltbench workspace with the Lightning Risk study open: an L-shaped building in 3D inside its collection area, under the protected volume the LPS design established for it, with the risk-by-zone bars against the tolerable limit and the risk components beside them.
The workspace: one building, every study's findings beside it. Dimensions to scale; a rod position is proposed and measured, and anything the design does not fix says so on the figure.

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The validated Ed. 3.0:2024 risk engine is live. Create a free account and run it today — or leave your email to hear when the all-access plan opens for sign-up and when new tools ship.

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