IEC 60445 Ed. 3.0 b:1999, Basic and safety principles for man-machine interface, marking and identification - Identification of equipment terminals ... general rules for an alphanumeric system

Applies to the identification and marking of terminals of electrical equipment such as resistors, fuses, relays, contactors, transformers, rotating machines and, whenever applicable, to combinations of such equipment (e.g. assemblies). It also applies to the identification of terminations of certain designated conductors. This basic safety publication is intended for use by technical committees in the preparation of standards in accordance with the principals laid down in IEC Guide 104 and ISO/IEC Guide 51.