DIN EN 61558-2-6-1998
电力变压器安全性.供电设备及类似设备.第2-6部分:普通安全变压器特殊要求
Safety of power transformers, power supply units and similar - Part 2-6: Particular requirements for safety isolating transformers for general use (IEC 61558-2-6:1997); German version EN 61558-2-6:1997