# Division 1 — North American vs IEC/ATEX explosion protection designations

For Division 1, category is area classification; iec / atex designation is Zone 1 (+ Zone 0); basis or note is Explosive atmosphere likely during normal operation (10–1000 hrs/yr), recorded from its source on 2026-08-06.

- **Category:** area classification _(our reading, not quoted from the source)_
- **North American designation:** Division 1 _(verified: appears in the quote below)_
- **IEC / ATEX designation:** Zone 1 (+ Zone 0) _(verified: appears in the quote below)_
- **Basis or note:** Explosive atmosphere likely during normal operation (10–1000 hrs/yr) _(verified: appears in the quote below)_

## What the source says

> Division 1 | Zone 1 (+ Zone 0) | Explosive atmosphere likely during normal operation (10–1000 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/).