Mark,
Yes you still have to ground any metal box.
Use a plastic plate on IG outlets, if you use a metal plate it is possible for it to contact the metal box connecting the isolated ground to the equipment ground.
12/2 MC IG will have a 2 greens 1 with a yellow stripe. I do not know if available where you are.
12/2 Hospital Grade type AC cable (if you can substitute for mc) use the outer jacket for equipment ground the insulated ground for isolated ground
12/3 MC remark red to green with yellow band.
[This message has been edited by iwire (edited 03-28-2003).]
