GB 17466.21-2008
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
Boxes 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