# II 3D — Certification marks and hazardous-area classifications: cross-market equivalences

For II 3D, market / system is ATEX; stated equivalent is Dc; applies to is Zone 22 only, verified against its source on 2026-08-11.

- **Designation:** II 3D _(verified: appears in the quote below)_
- **Market / system:** ATEX _(verified: appears in the quote below)_
- **Stated equivalent:** Dc _(verified: appears in the quote below)_
- **Applies to:** Zone 22 only _(verified: appears in the quote below)_

## What the source says

> d, h Ammonia (630°C), Hydrogen (560°C), Suitable for Zone 22 only T1: 450°C Methane (537°C), Propane (470°C) ATEX Group & Category: II 3D Zone 22 T2: 300°C Ethylene (425°C), Butane (372°C), Acetylene (305°C) IECEx Equipment Protec on Level: Dc Types of protec on (electrical):

## Source

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

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/).