IEEE C57.12.50 · UL
For IEEE C57.12.50, nrtl is UL; standard title is Ventilated Dry - Type Distribution Transformers, 1 to 500 kVA, Single-Phase; and 15 to 500 kVA, Three Phase; laboratory is UL LLC; osha docket is OSHA-2009-0025; status is currently recognized, recorded from its source on 2026-10-01; source re-checked 2026-11-10.
- Test standard
- IEEE C57.12.50 verified
- Standard title
- Ventilated Dry - Type Distribution Transformers, 1 to 500 kVA, Single-Phase; and 15 to 500 kVA, Three Phase verified
- NRTL
- UL
- Laboratory
- UL LLC
- OSHA docket
- OSHA-2009-0025 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 C57.12.50 | Ventilated Dry - Type Distribution Transformers, 1 to 500 kVA, Single-Phase; and 15 to 500 kVA, Three Phase |
— osha.gov, retrieved 2026-10-01
Where each value comes from
The value above is stated away from the sentence quoted with the answer, so the passage that states it is shown here too.
OSHA docket
Docket Number: OSHA-2009-0025
— all from osha.gov, retrieved 2026-10-01
Source
- osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/ul