UL 1557

For UL 1557, laboratory is CSA Group Testing and Certification Inc; standard title is Electrically Isolated Semiconductor Devices, verified against its source on 2026-08-10.

Laboratory: CSA Group Testing and Certification Inc. verified
Standard number: UL 1557 verified
Standard title: Electrically Isolated Semiconductor Devices verified

Sourceosha.gov

Verified2026-08-10

Review by2026-12-08

DatasetWhich OSHA NRTL is recognized for which test standard: all 21 labs' scopes of recognition, cross-referenced

What the source says

UL 1557 | Electrically Isolated Semiconductor Devices |

— osha.gov, retrieved 2026-08-10

Source

osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/csa

Last verified against source: 2026-08-10. Due for re-check by 2026-12-08. This page as Markdown · OKF bundle · full dataset as JSON.