Applies to three-phase and single-phase power transformers (including auto-transformers) except of certain categories of small and special transformers (with rated powers less than 5 kVA and 1 kVA, respectively, instrument, starting, testing and welding
IEC 60076-1:1993 Power transformators; part 1: general has been changed from IEC 60076-4:1976 Power Transformers Part 4: Tappings and Connections (Edition 1.0).