EN 61558-2-8-2010 变压器,反应堆,供电机组及其组合的安全性.第2-8部分:电铃和电钟用变压器和供电机组的特殊要求和试验
Safety of transformers, reactors, power supply units and combinations thereof - Part 2-8: Particular requirements and tests for transformers and power supply units for bells and chimes