# Ex d / da / db / dc — Certification marks and hazardous-area classifications: cross-market equivalences

For Ex d / da / db / dc, meaning is Flameproof; governing standard / law is EN/IEC 60079-1, verified against its source on 2026-08-11.

- **Designation:** Ex d / da / db / dc _(verified: appears in the quote below)_
- **Meaning:** Flameproof _(verified: appears in the quote below)_
- **Governing standard / law:** EN/IEC 60079-1 _(verified: appears in the quote below)_

## What the source says

> Flameproof - Ex d / da / db / dc EN/IEC 60079-1

## 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/).