IEC 61558-2-6:2021 RLV Safety of transformers, reactors, power supply units and combinations thereof - Part 2-6: Particular requirements and tests for safety isolating transformers and power supply units incorporating safet
2009IEC 61558-2-6:2009 Safety of transformers, reactors, power supply units and similar products for voltages up to 1100 V - Part 2-6: Particular requirements and tests for safety isolating transformers and power supply units incorporating safety isolating transformers
1997IEC 61558-2-6:1997 Safety of power transformers, power supply units and similar - Part 2: Particular requirements for safety isolating transformers for general use