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At Rill Architects we run ArchiCAD on Mac OS X. If you work at Rill, this is your stuff. If you don't, but you work in ArchiCAD, you may find something interesting. Anybody else, I don't know.
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Electrigon is a free set of symbols for electrical fixtures with the ability to calculate electrical requirements for a project. The new version brings some more geometry options and improved calculations.

Yes, such functionality should ship with Archicad. We do what we can.