# Class II, Group F — North American vs IEC/ATEX explosion protection designations

For Class II, Group F, category is dust group; iec / atex designation is IIIB; basis or note is Carbon dusts, recorded from its source on 2026-08-06.

- **Category:** dust group _(our reading, not quoted from the source)_
- **North American designation:** Class II, Group F _(verified: appears in the quote below)_
- **IEC / ATEX designation:** IIIB _(verified: appears in the quote below)_
- **Basis or note:** Carbon dusts

## What the source says

> Gas / dust group | Typical Substances | IIC | Acetylene | Class I, Group A | Acetylene | IIB + H 2 | Hydrogen | Class I, Group B | Hydrogen | IIB | Ethylene | Class I, Group C | Ethylene | IIA | Propane | Class I, Group D | Propane | IIIC | Conductive dust | Class II, Group E | Combustible metal dust | IIIB | Non-conductive dust | Class II, Group F |

## 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/).