I was curious, where in the code does it allow me to mark the white as hot in a 12-2 w/ground MC cable? I am wiring a commercial ice machine that needs 208 volt single phase 2-wire circuit with ground. I wire A/C units with 12-2 and 10-2 romex and mark the white red to give me 2 hots for 240 on residential units so I figured on using MC for this job. I need a code article if possible to reassure me this is legal and will pass inspection. Any help would be appreciated.