Safety of transformers, reactors, power supply units and similar products for supply voltages up to 1100 V. Particular requirements and tests for safety isolating transformers and power supply units incorporating safety isolating transformers|Isolating transformers, Power output, Polyphase transformers, Electrical safety, Rated frequencies, Marking, Single-phase transformers, Dry-type transformers, Safety isolating transformers, Portable, Electrical insulation, Rated voltage, Transformers, Power transformers, Small-power transformers, Electric power systems, Stationary, Electrical equipment