I want to replace an existing 2-prong receptacle in a bathroom with a GFCI receptacle. There is no ground wire going to the existing receptacle and no grounded metal cable or grounded metal outlet box -- just two separate wires, one white and one black. There is also no practical way to run a new ground wire back to the service.
In this situation, is it okay to go ahead and install the GFCI receptacle and put the sticker on it that says "No Equipment Ground"?
UP.SO. I "could" run a ground wire from the GFCI receptacle to a cold water pipe and make sure that there is a jumper across the hot water tank in and out pipes and across the water meter. But, I think I read somewhere about that being a bad idea (using the cold water pipe for a ground). That is a bad idea, right?