This standard provides preferred voltage ratings above 230 kilovolts nominal for alternating-current systems and equipment.
IEEE C92.2-1981 history
1987IEEE C92.2-1987 Power Systems - Alternating-Current Electrical Systems and Equipment Operating at Voltages Above 230 kV Nominal - Preferred Voltage Ratings
1981IEEE C92.2-1981 PREFERRED VOLTAGE RATINGS FOR ALTERNATING-CURRENT ELECTRICAL SYSTEMS AND EQUIPMENT OPERATING AT VOLTAGES ABOVE 230 KILOVOLTS NOMINAL