# UL Mark — Certification marks and hazardous-area classifications: cross-market equivalences

For UL Mark, meaning is tested and determined that a product meets UL specified product safety requirements; administered by is Underwriters Laboratories, verified against its source on 2026-08-11.

- **Designation:** UL Mark _(verified: appears in the quote below)_
- **Meaning:** tested and determined that a product meets UL specified product safety requirements _(verified: appears in the quote below)_
- **Administered by:** Underwriters Laboratories _(verified: appears in the quote below)_

## What the source says

> UL Mark indicates that either Underwriters Laboratories or an equivalent nationally recognized testing laboratory (NRTL) has tested and determined that a product meets UL specified product safety requirements.

## Source

- https://www.belfuse.com/resource-library/tech-paper/power-supply-safety-standards-agencies-and-marks

Last verified: 2026-08-11. Review by: 2027-08-11.
Part of [Certification marks and hazardous-area classifications: cross-market equivalences](https://referencesource.org/certification-standards-equivalence/).