Purpose. This standard provides a list of graphic symbols and class designation letters for use on electrical and electronics diagrams.
IEEE 315-1971 history
1975IEEE 315-1975 Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Class Designation Letters) CSA Z99-75; Includes supplement to ANSI Y32.2-75 and IEEE 315-75
1971IEEE 315-1971 Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Class Designation Letters)