IEC 60335-2-51 AMD 2-2011
家庭和类似的安全电气用品.第2-51部分:加热和工业水利设施用固定的循环泵的特定要求;修改件2
Household and similar electrical appliances - Safety - Part 2-51: Particular requirements for stationary circulation pumps for heating and service water installations; Amendment 2