# UL 977 — Which OSHA NRTL is recognized for which test standard: all 21 labs' scopes of recognition, cross-referenced

For UL 977, laboratory is CSA Group Testing and Certification Inc; standard title is Fused Power-Circuit Devices, verified against its source on 2026-08-10.

- **Laboratory:** CSA Group Testing and Certification Inc. _(verified: appears in the quote below)_
- **Standard number:** UL 977 _(verified: appears in the quote below)_
- **Standard title:** Fused Power-Circuit Devices _(verified: appears in the quote below)_

## What the source says

> UL 977 | Fused Power-Circuit Devices |

## Source

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

Last verified: 2026-08-10. Review by: 2026-12-08.
Part of [Which OSHA NRTL is recognized for which test standard: all 21 labs' scopes of recognition, cross-referenced](https://referencesource.org/nrtl-recognition-scopes/).