Historical
IEEE Std C57.12.22-1993 (R1998)
American National Standard for Transformers? Pad-Mounted, Compartmental-Type, Self-Cooled, Three-Phase Distribution Transformers with High-Voltage Bushings, 2500 kVA and Smaller: High-Voltage, 34 500 GrdY/19 920 Volts and Below; Low Voltage, 480 Volts and Below--Requirements
Content Provider
Institute of Electrical and Electronics Engineers [ieee]