DIN EN 60335-2-50-2008
家用和类似用途电器.安全性.第2-50部分:商用双层电蒸锅的特殊要求
Household and similar electrical appliances - Safety - Part 2-50: Particular requirements for commercial electric bains-marie (IEC 60335-2-50:2002 + A1:2007); German version EN 60335-2-50:2003+A1:2008