The old owners of my house ran a 1/4" copper pipe from the utility room, through the attic, down to the kitchen in order to supply the refrigerator with water for the icemaker. This pipe has become kinked and offers very little water flow so I'd like to replace it. I had planned on replacing it with a length of PEX since it's much cheaper than copper. When I went up into the attic to investigate however, I found what looks like an electrical wire affixed to the copper pipe. I can only assume that this is a ground wire, and that they used this pipe as a ground for something, possibly overhead lighting in the kitchen. Does this mean I'm forced to replace the pipe with copper so it can still use it as a ground, or is there an alternative that would allow me to use the cheaper PEX line?