# Division 1 · area classification · Zone 1 / Zone 21 — North American vs IEC/ATEX explosion protection designations

For Division 1, category is area classification; iec / atex designation is Zone 1 / Zone 21, recorded from its source on 2026-10-06.

- **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 21 _(verified: appears in the quote below)_

## What the source says

> Division 1 Zone 1 / Zone 21

## Related records

- [Class I · area classification · Zone 0, 1, 2 (gas)](https://referencesource.org/ex-classification-system-crosswalk/zone-0-1-2-gas-area-classification-class-i/)
- [Class I Division 1 · area classification · Zone 0](https://referencesource.org/ex-classification-system-crosswalk/zone-0-area-classification-class-i-division-1/)
- [Class I Division 1 · area classification · Zone 1](https://referencesource.org/ex-classification-system-crosswalk/zone-1-area-classification-class-i-division-1/)
- [Class I Division 2 · area classification · Zone 2](https://referencesource.org/ex-classification-system-crosswalk/zone-2-area-classification-class-i-division-2/)
- [Class II · area classification · Zone 20, 21, 22 (dust)](https://referencesource.org/ex-classification-system-crosswalk/zone-20-21-22-dust-area-classification-class-ii/)
- [Class III · area classification](https://referencesource.org/ex-classification-system-crosswalk/area-classification-class-iii/)
- [Division 1 · area classification · Zone 0 / Zone 1](https://referencesource.org/ex-classification-system-crosswalk/zone-0-zone-1-area-classification-division-1/)
- [Division 1 · area classification · Zone 0 / Zone 20](https://referencesource.org/ex-classification-system-crosswalk/zone-0-zone-20-area-classification-division-1/)
- [Division 1 · area classification · Zone 1 (+ Zone 0)](https://referencesource.org/ex-classification-system-crosswalk/zone-1-zone-0-area-classification-division-1/)
- [Division 2 · area classification · Zone 2](https://referencesource.org/ex-classification-system-crosswalk/zone-2-area-classification-division-2/)
- [Division 2 · area classification · Zone 2 / Zone 22](https://referencesource.org/ex-classification-system-crosswalk/zone-2-zone-22-area-classification-division-2/)

## Source

- https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf

Last verified: 2026-10-06. Review by: 2028-10-05.
Part of [North American vs IEC/ATEX explosion protection designations](https://referencesource.org/ex-classification-system-crosswalk/).