Their is a plastic pipe for the drain. But I do not see any plastic on
the cold water pipe. However, I live in an apartment and out side of my
bathroom, I do not know if their is any other plastic pipe connected to
that cold water pipe!

I do have a (heat) radiator which is like a pipe.

SR!

wrote:
If your cold water pipe connects anywhere to a plastic pipe in the
plumbing system,you can not use it for grounding.
cuhulin