# Class II Groups E, F, G — North American vs IEC/ATEX explosion protection designations

For Class II Groups E, F, G, category is system attribute; iec / atex designation is Zone 20, 21, 22 (IIIA, IIIB, IIIC); basis or note is Dust classification, recorded from its source on 2026-08-06.

- **Category:** system attribute _(our reading, not quoted from the source)_
- **North American designation:** Class II Groups E, F, G _(verified: appears in the quote below)_
- **IEC / ATEX designation:** Zone 20, 21, 22 (IIIA, IIIB, IIIC) _(verified: appears in the quote below)_
- **Basis or note:** Dust classification _(verified: appears in the quote below)_

## What the source says

> Dust classification | Class II Groups E, F, G | Not covered | Zone 20, 21, 22 (IIIA, IIIB, IIIC)

## 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/).