most severe NEBS / Telcordia GR-63 seismic qualification tier for equipment racks
Zone 4observed
| 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 | 2026-10 |
| Source | Clark Testing, Telcordia/Bellcore GR-63 seismic testing summary; Verizon NEBS technical update (GR-63-CORE Issue 5, December 2017) · Seismic zone severity explanation; Zone 4 is the most severe tier |
| Review | checking…review by 2027-10-01 · standard cadence |
| Recorded changes | last 2026-10-15 · 3 revisions tracked |
| Claim id | most-severe-nebs-telcordia-gr-63-seismic |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.