# Division 1 — Certification marks and hazardous-area classifications: cross-market equivalences

For Division 1, stated equivalent is Zone 1 (+ Zone 0); meaning is Explosive atmosphere likely during normal operation (10–1000 hrs/yr), verified against its source on 2026-08-11.

- **Designation:** Division 1 _(verified: appears in the quote below)_
- **Stated equivalent:** Zone 1 (+ Zone 0) _(verified: appears in the quote below)_
- **Meaning:** 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)

## Sources disagree

More than one authority states this, and they do not state the same
thing. Both are reproduced with the source each came from.

### Stated equivalent

exknowledge.com says stated equivalent is **Zone 1 (+ Zone 0)**, as of 2026-08-11.

> 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

exknowledge.com says stated equivalent is **Category 2**, as of 2026-08-11.

> Map existing equipment to ATEX categories (Division 1 equipment generally satisfies Category 2; Division 2 satisfies Category 3)

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


## Source

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

Last verified: 2026-08-11. Review by: 2027-08-11.
Part of [Certification marks and hazardous-area classifications: cross-market equivalences](https://referencesource.org/certification-standards-equivalence/).