DIN EN 60998-2-1-2005 家用及类似用途低压电路连接器件.第2-1部分:作为单独分立件的带有螺纹式夹紧装置的连接器件的特殊要求
Connecting devices for low-voltage circuits for household and similar purposes - Part 2-1: Particular requirements for connecting devices as separate entities with screw-type clamping units (IEC 60998-2-1:2002, modified); German version EN 60998-2-1:2004