# FM 3620 — Which OSHA-recognized labs (NRTLs) can certify to a given test standard

For FM 3620, standard title is Purged and Pressurized Electrical Equipment for Hazardous (Classified) Locations; nrtl is FM; laboratory is FM Approvals; status is currently recognized, recorded from its source on 2026-08-10.

- **Test standard:** FM 3620 _(verified: appears in the quote below)_
- **Standard title:** Purged and Pressurized Electrical Equipment for Hazardous (Classified) Locations _(verified: appears in the quote below)_
- **NRTL:** FM _(verified: appears in the quote below)_
- **Laboratory:** FM Approvals _(verified: appears in the quote below)_
- **Status:** currently recognized _(our reading, not quoted from the source)_

## What the source says

> FM 3620 | Purged and Pressurized Electrical Equipment for Hazardous (Classified) Locations |

## Source

- https://www.osha.gov/nationally-recognized-testing-laboratory-program/fm

Last verified: 2026-08-10. Review by: 2026-11-08.
Part of [Which OSHA-recognized labs (NRTLs) can certify to a given test standard](https://referencesource.org/nrtl-recognized-test-standards/).