GB/T 19212.15-2016 Safety of transformers, reactors, power supply units and combinations thereof—Part 15: Particular requirements and tests for variable transformers and power supply units incorporating variable transformers
2016GB/T 19212.15-2016 Safety of transformers, reactors, power supply units and combinations thereof—Part 15: Particular requirements and tests for variable transformers and power supply units incorporating variable transformers