NF C52-558-2-12*NF EN 61558-2-12:2011 变压器、反应器、电源装置和组合装置的安全性 第2-12部分:恒压变压器和恒压电源装置的特殊要求和测定
Safety of transformers, reactors, power supply units and combinations thereof - Part 2-12 : particular requirements and tests for constant voltage transformers and power supply units for constant voltage