EN 61558-2-6:1997 Safety of Power Transformers@ Power Supply Units and Similar Part 2-6: Particular Requirements for Safety Isolating Transformers for General Use
2009EN 61558-2-6:2009 Safety of transformers, reactors, power supply units and similar products for supply voltages up to 1 100 V - Part 2-6: Particular requirements and tests for safety isolating transformers and power supply units incorporating safety isolating transformers
1997EN 61558-2-6:1997 Safety of Power Transformers@ Power Supply Units and Similar Part 2-6: Particular Requirements for Safety Isolating Transformers for General Use