I have heard of both situations but here, in western PA, I've only seen the situation Arthur described. That is a very real condition here and I remember the older Bell Telephone techs carrying a little meter that was probably a megger with one lead attached to a long wire that was attached to the well casing and the other probe was used to test ground and bond points in the system. The good techs always found the loose bond.
I work a lot of construction and the only crimp rings I have seen used with PEX have been stainless steel. I'm afraid of PEX because, 50 years down the road, some tree hugger will insist it causes male pattern baldness or infertility in toads. I don't want to take any chances.
Rcaman
