# NRTLs (UL, FM, CSA) — North American vs IEC/ATEX explosion protection designations

For NRTLs (UL, FM, CSA), category is system attribute; iec / atex designation is Notified Bodies (ATEX) / ExCBs (IECEx); basis or note is Certification body, recorded from its source on 2026-08-06.

- **Category:** system attribute _(our reading, not quoted from the source)_
- **North American designation:** NRTLs (UL, FM, CSA) _(verified: appears in the quote below)_
- **IEC / ATEX designation:** Notified Bodies (ATEX) / ExCBs (IECEx) _(verified: appears in the quote below)_
- **Basis or note:** Certification body _(verified: appears in the quote below)_

## What the source says

> Certification body | NRTLs (UL, FM, CSA) | NRTLs | Notified Bodies (ATEX) / ExCBs (IECEx)

## 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/).