KS C IEC 61558-2-4:2022 Safety of transformers, reactors, power supply units and combinations thereof — Part 2-4: Particular requirements and tests for isolating transformers and power supply units incorporating isolating tr
2022KS C IEC 61558-2-4:2022 Safety of transformers, reactors, power supply units and combinations thereof — Part 2-4: Particular requirements and tests for isolating transformers and power supply units incorporating isolating tr
2017KS C IEC 61558-2-4:2017 Safety of power transformers, power supply units and similar devices-Part 2:Particular requirements for isolating transformers for general use
2002KS C IEC 61558-2-4:2002 Safety of power transformers, power supply units and similar devices-Part 2:Particular requirements for isolating transformers for general use