本标准涵盖了电气和电子零件及设备参考名称的形成和应用。本标准的参考名称旨在唯一识别和定位图表和集合中的离散项目，并将集合中的项目、图表上的图形符号以及零件清单、电路描述和说明中的项目关联起来。本标准包括形成和应用参考名称的三种方法；单元编号法、位置编号法和位置编码法。 一个完整的参考标号可以包含从基本零件到完整单元的任何级别上使用这些方法形成的参考标号。单元编号法在所有类型的电气和电子设备中都有良好的使用历史。已开发了位置编号方法和位置编码方法，以允许在大型复杂设备中快速物理定位项目，这些设备具有许多相同或非常相似的项目的多种用途。这些方法的应用方式应确保设备或系统中不会出现重复的完整参考名称。 本标准不包括用于电力开关设备和工业控制的设备功能名称。

This Standard covers the formation and application of reference designations for electrical and electronics parts and equipment.The reference designations of this standard are intended for uniquely identifying and locating discrete items on diagrams and in a set, and for correlating items in a set, graphic symbols on diagrams, and items in parts lists, circuit descriptions, and instructions.This standard includes three methods for forming and applying reference designations; the unit number method, the location numbering method, and the location coding method. A complete reference designation may incorporate reference designations formed by the use of any of these methods at any level from basic parts to complete units.The unit numbering method has a long history of satisfactory use in all types of electrical and electronics equipment. The location numbering method and location coding method have been developed to permit rapid physical location of items in large, complicated equipments featuring multiple use of many identical, or closely similar, items. These methods shall be applied in such a way that duplicate complete reference designations do not occur in an equipment or system. Device function designations for power switchgear and industrial control use are not covered by this standard.