# Hermetically sealed — North American vs IEC/ATEX explosion protection designations

For Hermetically sealed, category is protection concept; iec / atex designation is Ex nC / Ex m; iec standard is IEC 60079-15 / -18; basis or note is Seal ignition source from atmosphere, recorded from its source on 2026-08-06.

- **Category:** protection concept _(our reading, not quoted from the source)_
- **North American designation:** Hermetically sealed _(verified: appears in the quote below)_
- **IEC / ATEX designation:** Ex nC / Ex m _(verified: appears in the quote below)_
- **IEC standard:** IEC 60079-15 / -18 _(verified: appears in the quote below)_
- **Basis or note:** Seal ignition source from atmosphere _(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: 2026-08-06. Review by: 2028-08-05.
Part of [North American vs IEC/ATEX explosion protection designations](https://referencesource.org/ex-classification-system-crosswalk/).