BS EN 61558-2-9:2011
电力变压器,电抗器,供电机组及其组合的安全性.Ⅲ类手用钨丝灯变压器和供电机组的详细要求和试验
Safety of transformers, reactors, power supply units and combinations thereof. Particular requirements and tests for transformers and power supply units for class III handlamps for tungsten filament lamps