# Hermetically sealed — Certification marks and hazardous-area classifications: cross-market equivalences

For Hermetically sealed, stated equivalent is Ex nC / Ex m; meaning is Seal ignition source from atmosphere; governing standard / law is IEC 60079-15 / -18, verified against its source on 2026-08-11.

- **Designation:** Hermetically sealed _(verified: appears in the quote below)_
- **Stated equivalent:** Ex nC / Ex m _(verified: appears in the quote below)_
- **Meaning:** Seal ignition source from atmosphere _(verified: appears in the quote below)_
- **Governing standard / law:** IEC 60079-15 / -18 _(verified: appears in the quote below)_

## What the source says

> Hermetically sealed | Ex nC / Ex m | IEC 60079-15 / -18 | Seal ignition source from atmosphere

## 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/).