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ANSI Y32.16 1968 Edition, March 1, 1968
Complete Document
Superseded By: IEEE 200
Includes all amendments and changes through Supplement A, November 17, 1970
Additional Comments: X-REF IEEE 200
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This standard covers the formation and application of reference designations for electrical and electronic 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 symbol on diagrams, and items in parts lists, circuit descriptions, and instructions.

This standard includes three methods for forming and applying reference designations: the Unit Numbering 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 unique parts to complete units.

The Unit Numbering Method has a long history of satisfactory use in all types of electrical and electronic 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 system.

Device function designations for power switchgear and industrial control use are not covred by this standard.1

1See USA Standard Manual and Automatic Station Control, Supervisory, and Associated Telemarketing Equipments, C37.2-1962.