IEEE C57.12.23 — Underground-Type Self-Cooled, Single-Phase Distribution Transformers with Separable Insulated High-Voltage Connectors; 167 kVA and Smaller

Reference: IEEE C57.12.23 · 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.

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