IPC-2612-1, Appendix A "Reference Designations"
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The title is incorrect. A basic reference designator consists of a Class Designation Letter(s), or just Class Letter(s), and a number (often referred to as a serial number). The title should be "Class Designation Letters" and this is how it is referred to in IEEE 315, in Clause 22.
A lot more to come as I have time and the inclination.
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Using standards makes communications better. If I know and use a standard and you use the same standard then we have a better understanding of each other. Case in point is a fuse holder. I have seen a couple of ways to reference designating a fuse holder or the new fuse clips. I have seen the use of FH (presumably to mean fuse holder) and I have seen the reuse of the class letter F for the fuse and the fuse holder, that is the fuse would be ref des F1 and the fuse holder would be ref des F1. In the 2nd case the ref des F1 is used twice--not a good idea and not needed.
What does IEEE 315, Clause 22 say about this situation. In Clause 22.4 is listed the class letter "X", which stands for a socket, a fuse holder, and a lamp socket. How is this applied? If you have a fuse that is ref des F1, then the fuse holder would be ref des XF1. You then know that this is the fuse holder for F1. If you have a fuse holder that holds two fuses, say F2 and F5. Then the fuse holder would be ref des XF2.
For fuse clips, of which you use in pairs, would be ref des XF#A and XF#B (the octothorpe would be replaced with whatever the fuse ref des Nr is). If you are using a schematic capture/diagram package that does not allow using the suffix letter with individual parts, such as KiCad, then replace A with E1 and replace B with E2. The class letter E stands for many things, two of which are terminal and miscellaneous electrical part.
There you go. Any comments or questions?