# Class III — Certification marks and hazardous-area classifications: cross-market equivalences

For Class III, meaning is NEC Class III (fibers/flyings) has no IEC equivalent, verified against its source on 2026-08-11.

- **Designation:** Class III _(verified: appears in the quote below)_
- **Meaning:** NEC Class III (fibers/flyings) has no IEC equivalent _(verified: appears in the quote below)_

## What the source says

> Fiber hazards: NEC Class III (fibers/flyings) has no IEC equivalent. IEC considers fibers within the dust framework.

## 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/).