1993IEC 60076-2:1993 Power transformers; part 2: temperature rise
1970IEC 60076-2:1976 Power transformers - Part 2: Temperature rise
IEC 60076-2/COR1:1997 Power transformers; part 2: temperature rise was changed to IEC 60076-2:2011 Power transformers - Part 2: Temperature rise for liquid-immersed transformers.