current North American SPD listing basis, ANSI-approved 2025; NEC mandates UL 1449 listing
UL 1449 5th Ed.observed
| 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 | 2025 |
| Source | UL Standards; NEMA Surge · Standard metadata; UL 1449 Edition 5, published and ANSI-approved October 21, 2025 |
| Review | checking…review by 2026-12-15 · slow cadence |
| Recorded changes | last 2026-06-29 |
| Claim id | current-north-american-spd-listing-basis-ansi |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.