EN 61558-2-13:2000 Safety of Power Transformers@ Power Supply Units and Similar Devices Part 2-13: Particular Requirements for Auto-Transformers for General Use
2009EN 61558-2-13:2009 Safety of transformers, reactors, power supply units and similar products for supply voltages up to 1 100 V - Part 2-13: Particular requirements and tests for auto transformers and power supply units incorporating auto transformers
2000EN 61558-2-13:2000 Safety of Power Transformers@ Power Supply Units and Similar Devices Part 2-13: Particular Requirements for Auto-Transformers for General Use