KS C IEC 61558-2-23-2017 Safety of power transformers, power supply units and similar devices-Part 2-23:Particular requirements for transformers for construction sites
2017KS C IEC 61558-2-23:2017 Safety of power transformers, power supply units and similar devices-Part 2-23:Particular requirements for transformers for construction sites
2005KS C IEC 61558-2-23:2005 Safety of power transformers, power supply units and similar devices-Part 2-23:Particular requirements for transformers for construction sites