Recently I ran a new outside light from an old circuit that has no ground. I'm told the outside box should be grounded. I ran a ground wire to the outside box and am wondering if there is any difference to connect it to a cold water pipe, or to connect it the the ground of a grounded circuit ( i.e., a circuit hooked to the grounding rod)?
P.S. I'm on the last room of my house after rebuilding it after Katrina! **I*** did everything - every nail, every screw , every board, every cuss word!
