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The reference designator usually consists of one or two letters followed by a number, e.g.

R13, C1002. The number is sometimes followed by a letter, indicating that components are grouped or matched with each other, e.g.

IEEE 315 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.

The IEEE renewed the standard in the 1990s, but withdrew it from active support shortly thereafter.

This document also has an ANSI document number, ANSI Y32.16-1975.

Subsequent demarcation are called assemblies and always have the Class Letter A as a prefix following by a sequential number starting with 1.

Note that IEEE-315-1975 2 defines separate class designation letters for separable assemblies (class designation A) and inseparable assemblies (class designation U).

Inseparable assembliesi.e., items which are ordinarily replaced as a single item of supply 2 are typically treated as components in this referencing scheme.

Class Designation Letters, IEEE Std 315-1975: Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters) (Reaffirmed 1993), IEEE and ANSI, New York, NY.

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Fb Alpha Reference Set