IEEE C57.12.40 — Three Phase Secondary Network Transformers, Subway and Vault Types (Liquid Immersed); 2500 kVA and Smaller

Name: IEEE C57.12.40 — Three Phase Secondary Network Transformers, Subway and Vault Types (Liquid Immersed); 2500 kVA and Smaller — accredited laboratories (Test Lab Index)
Creator: Test Lab Index

Reference: IEEE C57.12.40 · Scheme: OSHA NRTL product safety. The 1 laboratory below appears in the Current list of Nationally Recognized Testing Laboratories for this standard. Retrieved July 2026; ranking criteria on the methodology page.

#	Laboratory	Location	Cert / ID	Approved	Registry accreditations
1	UL LLC	Northbrook, Illinois, United States	—	—	6

Facts reproduced from the linked registry as retrieved July 2026. No ratings, no reviews — see methodology.