ANSI C57.12.21

For ANSI C57.12.21, standard title is Pad Mounted Compartmental-Type Self-Cooled Single-Phase Distribution transformers with High Voltage Bushings; 167 kVA and Smaller; status is no longer recognized, recorded from its source on 2026-08-10.

Test standard: ANSI C57.12.21 verified
Standard title: Pad Mounted Compartmental-Type Self-Cooled Single-Phase Distribution transformers with High Voltage Bushings; 167 kVA and Smaller verified
Status: no longer recognized our reading

Sourceosha.gov

Verified2026-08-10

Review by2026-11-08

DatasetWhich OSHA-recognized labs (NRTLs) can certify to a given test standard

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

ANSI C57.12.21 | Pad Mounted Compartmental-Type Self-Cooled Single-Phase Distribution transformers with High Voltage Bushings; 167 kVA and Smaller |

— osha.gov, retrieved 2026-08-10

Source

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

Last verified against source: 2026-08-10. Due for re-check by 2026-11-08. This page as Markdown · OKF bundle · full dataset as JSON.