Follow each service
Associate power and signal services with the equipment groups they feed. Review entrance and downstream protection requirements, including groups with different withstand and criticality.
IEC 62305-4 · Ed. 3.0:2024 · Surge protection measures (SPM)
Surge protection design to IEC 62305-4.
Specify SPDs for each service and equipment group.
Produce a manufacturer-neutral SPD specification: service by service, from the entrance to the equipment groups it feeds. Review the protection requirements and check candidate-device data against the schedule.
Calculations and on-screen working are free. Pay once for this study’s documents and reissues, or unlock the whole building.
Check a candidate device
Enter the relevant datasheet figures and compare them with the scheduled requirements. The specification names requirements rather than selecting a manufacturer’s catalogue product.
Connect outside and inside
Position external equipment and associate its feeder. Where suitable LPS rod data is available, check the declared exposure against the protected volume; otherwise the declaration remains an installation input.
What you enter and what you get
- Review the inherited protection basis and supply.
- Define equipment groups and the services that feed them.
- Compute the schedule and inspect candidate-device checks.
- Resolve installation and coordination requirements, then issue.
The document you can inspect
An LPZ and bonding concept, SPD requirements by service and boundary, equipment-level protection requirements, candidate checks and the installation conditions to verify.
Issued reports carry a title block, report number and revision history. The full sample is open without an account; the sample dossier shows all three studies on one building.
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 the three studies run 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.
Check the scope for your project
Manufacturer evidence is still needed for energy coordination between cascaded SPDs. Installation declarations are not measured clearances. PV DC-side protection, detailed Rule no. 2 analysis, simulated current sharing and full electromagnetic-field studies are outside the implemented scope.
Start with your building
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