I agree that having standard electrical symbols wold be very useful. As I am not an electrician, I need to look for these symbols when I need them (and remain confused...), for instance at Commons Wikimedia Electrical symbols.
To create the symbols themselves, you will need a graphics editor (Paint or similar will do, but a more advanced editor like the Gimp or Inkscape will let you do more). You probably will want to save the symbols in .PNG format. Then, you will need the Furniture Library Editor and edit the properties manually as described above and include the symbol file you created.
Admittedly, this is not a very easy process, but it would be useful if someone expanded the library. Some symbols are also posted in SF 3D models 325.
ok
