# Class I, Group B — North American vs IEC/ATEX explosion protection designations

For Class I, Group B, category is gas group; iec / atex designation is IIB + H2; basis or note is Hydrogen, recorded from its source on 2026-08-06.

- **Category:** gas group _(our reading, not quoted from the source)_
- **North American designation:** Class I, Group B _(verified: appears in the quote below)_
- **IEC / ATEX designation:** IIB + H2 _(verified: appears in the quote below)_
- **Basis or note:** Hydrogen _(verified: appears in the quote below)_

## What the source says

> IIB + H 2 | Hydrogen | Class I, Group B | Hydrogen

## Source

- https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups

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/).