IEEE 200-1975 PDF Download

The IEEE Standard Reference Designations for Electrical and Electronics Parts and Equipment, titled IEEE 200-1975, is a standard that provides guidelines for the formation and application of reference designations in electrical and electronics systems. The purpose of this standard is to uniquely identify and locate discrete items on diagrams and in sets, as well as to correlate items in a set, graphic symbols on diagrams, and items in parts lists, circuit descriptions, and instructions.

The standard includes three methods for forming and applying reference designations: the unit number method, the location numbering method, and the location coding method. The unit number method, which has a long history of use in electrical and electronics equipment, assigns reference designations to individual parts and components. The location numbering method and location coding method are specifically designed for complex equipment with multiple identical or similar items, allowing for rapid physical location of these items within the equipment.

It is important to note that the standard aims to avoid the occurrence of duplicate complete reference designations within an equipment or system. Power switch gear and industrial control device function designations are not covered by this standard.