# Dust-ignition-proof — Certification marks and hazardous-area classifications: cross-market equivalences

For Dust-ignition-proof, stated equivalent is Ex t (Dust protection by enclosure); meaning is Prevent dust ingress and limit surface temperature; governing standard / law is IEC 60079-31, verified against its source on 2026-08-11.

- **Designation:** Dust-ignition-proof _(verified: appears in the quote below)_
- **Stated equivalent:** Ex t (Dust protection by enclosure) _(verified: appears in the quote below)_
- **Meaning:** Prevent dust ingress and limit surface temperature _(verified: appears in the quote below)_
- **Governing standard / law:** IEC 60079-31 _(verified: appears in the quote below)_

## What the source says

> Dust-ignition-proof | Ex t (Dust protection by enclosure) | IEC 60079-31 | Prevent dust ingress and limit surface temperature

## Source

- https://exknowledge.com/pages/nec-500-vs-atex-iec.html

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/).