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The IEEE 315 standard contains a list of Class Designation Letters to use for electrical and electronic assemblies. For example, the letter R is a reference prefix for the resistors of an assembly, C for capacitors, K for relays. Industrial electrical installations often use reference designators according to IEC 81346.
(in English) (1993) 315-1975 - IEEE Standard American National Standard Canadian Standard Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters), IEEE, p. 28 DOI: 10.1109/IEEESTD.1993.93397. ISBN: 0738109479. Author
IEEE 315-1975 (1993) 8.2.1.1.c.svg (in English) (1993) 315-1975 - IEEE Standard American National Standard Canadian Standard Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters) , IEEE, p. 126 DOI : 10.1109/IEEESTD.1993.93397 .
Wire crossover symbols for circuit diagrams. The CAD symbol for insulated crossing wires is the same as the older, non-CAD symbol for non-insulated crossing wires. To avoid confusion, the wire "jump" (semi-circle) symbol for insulated wires in non-CAD schematics is recommended (as opposed to using the CAD-style symbol for no connection), so as to avoid confusion with the original, older style ...
IEEE 315 Contacts, Switches, Contactors, and Relays Symbols (10).svg (in English) (1993) 315-1975 - IEEE Standard American National Standard Canadian Standard Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters), IEEE, p. 64 DOI: 10.1109/IEEESTD.1993.93397. ISBN: 0738109479. Author
IEEE 315-1975 (1993) 8.5.1.svg (in English) (1993) 315-1975 - IEEE Standard American National Standard Canadian Standard Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters) , IEEE, p. 118 DOI : 10.1109/IEEESTD.1993.93397 .
IEEE 315-1975 (1993) 8.5.1.svg (in English) (1993) 315-1975 - IEEE Standard American National Standard Canadian Standard Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters) , IEEE, p. 121 DOI : 10.1109/IEEESTD.1993.93397 .
IEEE 315-1975 (1993) 8.5.1.svg (in English) (1993) 315-1975 - IEEE Standard American National Standard Canadian Standard Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters) , IEEE, p. 119 DOI : 10.1109/IEEESTD.1993.93397 .