IEC 62305, on one model of your building.
One building. Three studies. One document. Risk assessment (Part 2), LPS design (Part 3) and surge protection design (Part 4), all run against the same model — live in 2D and 3D.
Free to run every study. Pay once to unlock its documents — reissues included.
Change a dimension and the model redraws as you type. Save it, and every study whose numbers it moves says so — nothing silently describes a building that no longer exists.
Three studies of one building
3 studies live today. Describe the building once; each study reads what the others established. More electrical calculators to follow.
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.
Lightning Risk
LiveIEC 62305-2 risk assessment → required protection level + PDF report.
LPS Design
LiveIEC 62305-3 external LPS — air termination, down conductors, separation distance, earthing.
SPM Design
LiveIEC 62305-4 surge protection measures — LPZ layout, bonding network, and a manufacturer-neutral coordinated SPD specification.
The building is the model
Rectangle, L, T or U — the plan you enter is the plan every figure is drawn from, in the workspace and on the signed report alike.
Validated, and checkable
Built to IEC 62305 Ed. 3.0:2024 and reconciled figure by figure against Furse, DEHN, Schneider, Legrand and ITU-T worked examples — including the standard's own case studies. Every factor shows its clause citation and every input its coefficient. Where a published source disagrees with us, we publish that too.
Free to run. Pay for what you issue.
Run every study and read the on-screen result at no cost. One payment unlocks the full clause-referenced report — the working an engineer signs off on — as a printable document and PDF, with corrections to the same study reissued free. Buy it for one study, or once for every study of a building and the combined dossier.
Honest figures
Every drawing states what it claims: dimensions are measured and to scale; a position the design does not fix is labelled illustrative; a mark with no place to stand is omitted and the omission is named. A figure that cannot say that is a claim nobody made.
One document per building
Every study of a building composes into one clause-referenced dossier: each chapter exactly as issued, the shared basis stated once, and any disagreement surfaced rather than smoothed over.
Reports are frozen when issued — engine and standard edition stamped on every one — and reproduce exactly. When the building moves on, the dossier says which chapters no longer describe it, instead of letting an old number stand quietly beside a new drawing.
📄 Read a full sample dossier ↗
Describe your building once
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