# UL 48 — Which OSHA-recognized labs (NRTLs) can certify to a given test standard

For UL 48, standard title is Electric Signs; nrtl is QAI; laboratory is QAI Laboratories, LTD (QAI); status is currently recognized, recorded from its source on 2026-08-10.

- **Test standard:** UL 48 _(verified: appears in the quote below)_
- **Standard title:** Electric Signs _(verified: appears in the quote below)_
- **NRTL:** QAI _(verified: appears in the quote below)_
- **Laboratory:** QAI Laboratories, LTD (QAI) _(verified: appears in the quote below)_
- **Status:** currently recognized _(our reading, not quoted from the source)_

## What the source says

> UL 48 | Electric Signs |

## Source

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

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/).