AutoCAD Electrical ships with predefined Electrical family codes such as PB for Push Buttons and CB for Circuit Breakers. Normally this is fine if you are just starting up with Electrical or do not care too much about your family naming. If though you prefer your company's custom naming or if a client requires it you may not readily realize how to do this and might either lose appeal to ACADe or lose a quote to someone else.
To control Electrical family naming you can do it with a mapping file called WD_FAM.DAT which depending on where it is stored can either change family naming for all projects or individual ones for specified clients.
I put together a quick white paper on this for your reference not only as to how the change can take place but also listing the default naming codes for any newbies out there.