IEC 62305-3 · Ed. 3.0:2024 · external LPS

The LPS design that computes the separation distance.

Air termination, down conductors, earthing, materials, bonding, touch & step voltages and the inspection regime — the whole external LPS per the 2024 edition of IEC 62305-3. Every coefficient carries its clause citation, and the separation distance s = k_i·k_c·l / k_m is computed both the simplified and the general (Annex B) way.

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Separation distance s

Class II · 20 m

Simplified (§6.3.2)

0.53 m

General (Annex B)

0.31 m

k_i = 0.06 k_m = 1.0 (air)

Σ k_cn·l_n per ring level (Fig. B.3)

→ general saves ~40 % of the buildable distance

Illustrative shapes — real figures come from the engine, each with its clause citation and calculation trace in the report.

The calculation the free tools skip

Single-form calculators size the mesh and count down conductors, but their input sets never collect the conductor length or current-division geometry the separation distance needs. Voltbench computes it both ways the standard defines and shows the trace.

The whole deliverable

Not just positioning: minimum conductor and electrode dimensions (Tables 7/8), equipotential bonding (Tables 9/10), touch & step voltage measures (Clause 8) and the inspection & maintenance regime (§7.4) — the document you hand a building owner.

The current edition, checkable

Built on IEC 62305-3 Ed. 3.0:2024. Every coefficient is a resolved value with its clause citation — the class II earth-electrode curve, the k_c current-division factors, the protection angle — verified page by page, never a black box.

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How it works

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