Historical
ANSI/IEEE C57.12.23-2002
Standard for Underground Type, Self-Cooled, Single-Phase, Distribution Transformers with Separable Insulated High-Voltage Connectors; High Voltage 25000 V and Below; Low Voltage 600 V and Below; 167 kVA and Smaller
Intended for use as a basis for determining performance, interchangeability, and safety of the equipment covered, and to assist in the proper selection of such equipment. Covers certain electrical, dimensional, and mechanical characteristics and takes
Institute of Electrical and Electronics Engineers [ieee]