Type 1 / Class I SPD test waveform (direct-lightning current); Type 2 / Class II uses 8/20 µs
10/350 µsobserved
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| As of | 2024 |
| Source | IEC 61643-11:2025 (AC SPDs), with common requirements in IEC 61643-01; DC low-voltage SPDs are covered by IEC 61643-41:2025 · SPD classification: IEC 61643-11 Type 1/Class I uses 10/350 µs; Type 2/Class II uses 8/20 µs. IEC 61643-11 remains a live AC-specific standard alongside IEC 61643-01. |
| Review | checking…review by 2026-10-16 · standard cadence |
| Recorded changes | last 2026-09-04 · 2 revisions tracked |
| Claim id | type-1-class-i-spd-test-waveform-direct |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.