# IEEE C37.74 — Which OSHA NRTL is recognized for which test standard: all 21 labs' scopes of recognition, cross-referenced

For IEEE C37.74, laboratory is UL LLC; standard title is Subsurface, Vault, and Pad-Mounted Load-Interrupter Switchgear and Fused Load-Interrupter Switchgear for Alternating Current Systems Up to 38 kV Switchgear, verified against its source on 2026-08-10.

- **Laboratory:** UL LLC _(verified: appears in the quote below)_
- **Standard number:** IEEE C37.74 _(verified: appears in the quote below)_
- **Standard title:** Subsurface, Vault, and Pad-Mounted Load-Interrupter Switchgear and Fused Load-Interrupter Switchgear for Alternating Current Systems Up to 38 kV Switchgear _(verified: appears in the quote below)_

## What the source says

> IEEE C37.74 | Subsurface, Vault, and Pad-Mounted Load-Interrupter Switchgear and Fused Load-Interrupter Switchgear for Alternating Current Systems Up to 38 kV Switchgear |

## Source

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

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/).