Laminated core packages for transformers and inductors used in telecommunication and electronic equipment - Part 1: Dimensions (IEC 61021-1:1990); German version EN 61021-1:1997
Outline dimensions of transformers and inductors for use in telecommunication and electronic equipment; part 1: transformers and inductors using YEI 1 laminations; identical with IEC 60852-1:1986
Safety of transformers, reactors, power supply units and combinations thereof - Part 1: General requirements and tests (IEC 61558-1:2017); German version EN IEC 61558-1:2019
Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2500 kVA with highest voltage for equipment not exceeding 36 kV - Part 4: Requirements and tests concerning pressurised corrugated tanks; German version EN 50464-4:2007/A1:2011