IEC 60445-1999
人机界面、标志和标识的基本原则和安全原则 设备端子和特定导线的线端标识,包括字母数字系统的一般规则
Basic and safety principles for man-machine interface, marking and identifiation - Identification of equipment terminals and of terminations of certain designated conductors, including general rules for an alphanumeric system