FM 3600 — Electrical Equipment for Use in Hazardous (Classified) Locations, General Requirements
Reference: FM 3600 · Scheme: OSHA NRTL product safety. The 5 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 | SGS North America, Inc. | Suwanee, Georgia, United States | — | — | 3 |
| 3 | DEKRA Certification, Inc. | Sterling, Virginia, United States | — | — | 3 |
| 4 | CSA Group Testing and Certification Inc. | Etobicoke, Ontario, Canada | — | — | 1 |
| 5 | FM Approvals | Norwood, Massachusetts, United States | — | — | 1 |
Facts reproduced from the linked registry as retrieved July 2026. No ratings, no reviews — see methodology.