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[quote user="7j43k"] I was hoping for a bit more specificity in answer to my first request.  Such as "an example".  Then I was hoping for a response to my next two requests.   Ed <div style="clear:both;"> </div> [/quote] I dont have an example off the top of my head, but riddle me this, what is the purpose of providing an electrical path around the UL listed transformer against the manufacturer's recommendations? In theory, the transformer that steps down the 120VAC to 0-22VAC or whatever you are using should be disigned to preclude the introduction of household current to the output of the transformer.  The scenario would probably involve faulty house wiring, or where the third prong that your layout is connected to ends up being the least path of resistance.  Would running your vacuum over its own power cord and shredding the insulation, resulting in 120VAC contacting the ground wire in the vaccuum cord, running back to the outlet, through you because you happened to touch the track, while standing in a puddle of water which reaches to the household piping or some other path to ground that is shorter than the electrical box? Fyi the GFCI you connect your drill to does not shut off the power to the wire you drilled into, please never forget that.  There have been deaths that resulted from assuming that the tool was de-energized when in fact it was still energized by the 480 or 4160VAC (cant remember which it was) wire it was sticking into on the other side of a concrete wall (they were not using an electric drill stop). But we are now kind of way off topic.  I dont know if the Op has gotten his answer yet, but: decoder outputs are not designed to receive track power from the dcc system.  The electronic circuitry on the board will literally get fried (I have some fried decoder pictures that I could dig up if you would like).
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