IEEE C57.12.20

What is the laboratory for IEEE C57.12.20?

For IEEE C57.12.20, laboratory is UL LLC; standard title is Overhead-Type Distribution Transformers, 500 kVA and Smaller, verified against its source on 2026-09-17.

IEEE C57.12.20 | Overhead-Type Distribution Transformers, 500 kVA and Smaller |

— osha.gov, retrieved 2026-08-10

Laboratory: UL LLC
Standard number: IEEE C57.12.20 verified
Standard title: Overhead-Type Distribution Transformers, 500 kVA and Smaller verified

Sourceosha.gov

Verified2026-09-17

Review by2027-01-06

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

Source

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

Last verified against source: 2026-09-17. Due for re-check by 2027-01-06. This page as Markdown · OKF bundle · full dataset as JSON.

IEEE C57.12.20

What is the laboratory for IEEE C57.12.20?

Source

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