UL 1971
For UL 1971, standard title is Signaling Devices for the Hearing Impaired; nrtl is FM; laboratory is FM Approvals; status is currently recognized, recorded from its source on 2026-08-10.
- Test standard
- UL 1971 verified
- Standard title
- Signaling Devices for the Hearing Impaired verified
- NRTL
- FM verified
- Laboratory
- FM Approvals verified
- Status
- currently recognized our reading
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
What the source says
UL 1971 | Signaling Devices for the Hearing Impaired |
— osha.gov, retrieved 2026-08-10
Source
- osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/fm