NEN 10061-2-1993 (IEC 61-1-1969 + K-1992的补充件 A-1970,修改)灯头,灯座及其互换性和安全性检测用量规.第2部分:灯座
Lamp caps and holders together with gauges for the control of interchangeability and safety. Part 2: Lampholder (IEC 61-2:1969 + supplements A:1970 to K: 1992, modified)