GB/T 17466.21-2008
AbolishedBoxes and enclosures for electrical accessories for household and similar fixed electrical installations - Part 21: Particular requirements for boxes and enclosures with provision for suspension means
家用和类似用途固定式电气装置的电器附件安装盒和外壳 第21部分：用于悬吊装置的安装盒和外壳的特殊要求