# (no NEC 500 equivalent) — North American vs IEC/ATEX explosion protection designations

For (no NEC 500 equivalent), category is area classification; iec / atex designation is Zone 0; basis or note is Explosive atmosphere continuously or for long periods (>1000 hrs/yr), recorded from its source on 2026-08-06.

- **Category:** area classification _(our reading, not quoted from the source)_
- **North American designation:** (no NEC 500 equivalent)
- **IEC / ATEX designation:** Zone 0 _(verified: appears in the quote below)_
- **Basis or note:** Explosive atmosphere continuously or for long periods (>1000 hrs/yr) _(verified: appears in the quote below)_

## What the source says

> Zone 0 | Explosive atmosphere continuously or for long periods (>1000 hrs/yr)

## Source

- https://exknowledge.com/pages/nec-500-vs-atex-iec.html

Last verified: 2026-08-06. Review by: 2028-08-05.
Part of [North American vs IEC/ATEX explosion protection designations](https://referencesource.org/ex-classification-system-crosswalk/).