可能我说的不太清楚,我想问的是,如何根据EN 60598-1 Cl. 13,的内容判断需做材料试验的insulating material。在这个条款里面说到parts of insulating material retaining current-carrying parts or SELV parts in position需要做125球压和针焰,不知道如何去理解“retaining current-carrying parts or SELV parts in position”?什么样的部件才是“retaining current-carrying parts or SELV parts in position”?