IEC 61558-2-2:2022 RLV Safety of transformers, reactors, power supply units and combinations thereof - Part 2-2: Particular requirements and tests for control transformers and power supply units incorporating control transf
2007IEC 61558-2-2:2007 Safety of power transformers, power supplies, reactors and similar products - Part 2-2: Particular requirements and tests for control transformers and power supplies incorporationg control transformers
1997IEC 61558-2-2:1997 Safety of power transformers, power supply units and similar - Part 2-2: Particular requirements for control transformers