Please be noted: These can't be used yet in Dia: Place them on a sheet export to SVG, and use them in another program. Currently it's impossible to rotate text or shapes, as a result, you cannot create a correct electrical drawing.
I needed it and didn't want to pay for Visio (or anything else).
I could explain, or just show and image of the symbols so far:
###Linux Place sheets/* in ~/.dia/sheets. Place shapes/electrical_be in ~/.dia/shapes/. ###Windows Place sheets/* in %HOMEPATH%/.dia/sheets. Place shapes/electrical_be in %HOMEPATH%/.dia/shapes/.
####Why is there a big gap around the symbols? This ensures you can place them on a grid and don't constantly have to fight with Dia to keep the center of the symbol on the grid. This also ensures if you resize a symbol, you can resize them consistently.
####In which countries can I use the symbols? I would like to know myself, the are ok for BE.
####A symbol is missing! Drop me the code/patch. Or provide me an example and pray I have time to add it :)
####A symbol is wrong / you misnamed a symbol / ... Blame me (and make sure I receive your blame), then I can fix it.