ANSI C57.12.24-2000 Transformers - Underground-Type Three-Phase Distribution Transformers, 2500 kVA and Smaller: High Voltage 34 500 Grd Y/19 920 Volts and Below; Low Voltage, 480 Volts and Below - Requirements
Covers certain electrical and mechanical characteristics and takes into consideration certain safety features of three-phase, 60-Hz, liquid-immersed, self-cooled, underground-type transformers rated 2500 KVA abd smaller with high voltages of 34 500 GRdY/
ANSI C57.12.24-2000 history
2000ANSI C57.12.24-2000 Transformers - Underground-Type Three-Phase Distribution Transformers, 2500 kVA and Smaller: High Voltage 34 500 Grd Y/19 920 Volts and Below; Low Voltage, 480 Volts and Below - Requirements
1994ANSI C57.12.24-1994 American National Standard for Transformers-- Underground-Type Three-Phase Distribution Transformers, 2500 kVA and Smaller, High Voltage, 34 500 GrdY/19 920 Volts and Below, Low Voltage, 480 Volts and Below - Requirements