can a single 277v hot wire be run by itself in wire mold feed from a switch up to a emergency light about 3ft up then use a piece of mc cable out of a nearby light to feed the neutral to the emergancy light .i got a lienced electrian at work who removed a switch in the wall put a wiremold box on wall surface drilled half inch hole no gromit or bushing in it ran 1 277v wire up wiremold mounted a single gang wiremold box then adapted a 1900 box on top of that [no bushing]then mounted a light on that ..he ran a mc cable out of the 1900 box to a near by light not even in the wall just hanging in the air ..he says this is ok in the code book ..it looks like hell and in my eyes a against code 300.20 but im not sure about ex.320.20 is this against code ? thanks ......