# ANSI C57.12.27 — Which OSHA-recognized labs (NRTLs) can certify to a given test standard

For ANSI C57.12.27, standard title is Liquid Filled Distribution transformers Used in Pad Mounted Installations, Including Unit Substations–Conformance Requirements; status is no longer recognized, recorded from its source on 2026-08-10.

- **Test standard:** ANSI C57.12.27 _(verified: appears in the quote below)_
- **Standard title:** Liquid Filled Distribution transformers Used in Pad Mounted Installations, Including Unit Substations–Conformance Requirements _(verified: appears in the quote below)_
- **Status:** no longer recognized _(our reading, not quoted from the source)_

## What the source says

> ANSI C57.12.27 | Liquid Filled Distribution transformers Used in Pad Mounted Installations, Including Unit Substations–Conformance Requirements |

## Source

- https://www.osha.gov/nationally-recognized-testing-laboratory-program/standards-no-longer-recognized

Last verified: 2026-08-10. Review by: 2026-11-08.
Part of [Which OSHA-recognized labs (NRTLs) can certify to a given test standard](https://referencesource.org/nrtl-recognized-test-standards/).