IEC 61558-2-4 pdf download Safety of transformers, reactors, power supply units and similar products for supply voltages up to 1 100 V – Part 2-4: Particular requirements and tests for isolating transformers and power supply units incorporating isolating transformers 14 Heating This clause of Part 1 is applicable. 15 Short-circuit and overload protection This clause of Part 1 is applicable....