# UL 943 — Which OSHA-recognized labs (NRTLs) can certify to a given test standard

For UL 943, standard title is Ground-Fault Circuit-Interrupters; nrtl is TUV; laboratory is TUV Rheinland of North America, Inc; status is currently recognized, recorded from its source on 2026-08-10.

- **Test standard:** UL 943 _(verified: appears in the quote below)_
- **Standard title:** Ground-Fault Circuit-Interrupters. _(verified: appears in the quote below)_
- **NRTL:** TUV _(verified: appears in the quote below)_
- **Laboratory:** TUV Rheinland of North America, Inc. _(verified: appears in the quote below)_
- **Status:** currently recognized _(our reading, not quoted from the source)_

## What the source says

> UL 943 | Ground-Fault Circuit-Interrupters. |

## Source

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

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/).