An edition of American national standard for transformers (1986)

American national standard for transformers

230 kV and below 833/958 through 8333/10 417 kVA, single-phase, and 750/862 through 60 000/80 000/100 000 kVA, three-phase without load tap changing; and 3750/4687 through 60 000/80 000/100 000 kVA with load tap changing-- safety requirements

By American National Standards Institute,National Electrical Manufacturers Association,Institute of Electrical and Electronics Engineers