IEEE C37.20.4
For IEEE C37.20.4, standard title is Indoor AC Switches (1 kV-38 kV) for Use in Metal-Enclosed Switchgear; nrtl is UL; laboratory is UL LLC; status is currently recognized, recorded from its source on 2026-08-10.
- Test standard
- IEEE C37.20.4 verified
- Standard title
- Indoor AC Switches (1 kV-38 kV) for Use in Metal-Enclosed Switchgear verified
- NRTL
- UL verified
- Laboratory
- UL LLC 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
IEEE C37.20.4 | Indoor AC Switches (1 kV-38 kV) for Use in Metal-Enclosed Switchgear |
— osha.gov, retrieved 2026-08-10
Source
- osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/ul