# UL 1203 — Which OSHA NRTL is recognized for which test standard: all 21 labs' scopes of recognition, cross-referenced

For UL 1203, laboratory is DEKRA Certification, Inc; standard title is Explosion-Proof and Dust-Ignition-Proof Electrical Equipment for Use in Hazardous (Classified) Locations, verified against its source on 2026-08-10.

- **Laboratory:** DEKRA Certification, Inc. _(verified: appears in the quote below)_
- **Standard number:** UL 1203 _(verified: appears in the quote below)_
- **Standard title:** Explosion-Proof and Dust-Ignition-Proof Electrical Equipment for Use in Hazardous (Classified) Locations _(verified: appears in the quote below)_

## What the source says

> UL 1203 | Explosion-Proof and Dust-Ignition-Proof Electrical Equipment for Use in Hazardous (Classified) Locations |

## Source

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

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/).