NFPA 496 — Purged and Pressurized Enclosures for Electrical Equipment
Reference: NFPA 496 · Scheme: OSHA NRTL product safety. The 8 laboratories below appear in the Current list of Nationally Recognized Testing Laboratories for this standard. Retrieved July 2026; ranking criteria on the methodology page.
| # | Laboratory | Location | Cert / ID | Approved | Registry accreditations |
|---|---|---|---|---|---|
| 1 | Intertek Testing Services NA, Inc. | Lake Forest, California, United States | — | — | 9 |
| 2 | UL LLC | Northbrook, Illinois, United States | — | — | 6 |
| 3 | SGS North America, Inc. | Suwanee, Georgia, United States | — | — | 3 |
| 4 | DEKRA Certification, Inc. | Sterling, Virginia, United States | — | — | 3 |
| 5 | TUV Rheinland of North America Inc. | Pleasanton, California, United States | — | — | 2 |
| 6 | Element Materials Technology Portland - Evergreen Inc. | Irvine, California, United States | — | — | 2 |
| 7 | LabTest Certification, Inc. | Richmond, BC, British Columbia, Canada | — | — | 2 |
| 8 | CSA Group Testing and Certification Inc. | Etobicoke, Ontario, Canada | — | — | 1 |
Facts reproduced from the linked registry as retrieved July 2026. No ratings, no reviews — see methodology.