UL 33

For UL 33, laboratory is UL LLC; standard title is Heat Responsive Links for Fire-Protection Service, verified against its source on 2026-08-10.

What the source says

UL 33 | Heat Responsive Links for Fire-Protection Service |

— osha.gov, retrieved 2026-08-10

Source

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

Last verified against source: 2026-08-10. Due for re-check by 2026-12-08. This page as Markdown · OKF bundle · full dataset as JSON.