Instead of assuming that electrical current is causing the deterioration of the copper water piping, the problem may simply be the choice of water pipe material.
The majority of the homes in my immediate neighborhood in Minnesota were constructed in 1986. In the last two years seven homes have experienced ruptured water service piping between the street and the house. Type L (standard) copper piping was used in 1986 instead of Type K (heavy) copper piping. Both types are acceptable by the applicable plumbing code for underground domestic water service. I have been told by the city engineer that more piping failures will likely occur in due time. If the installing contractor would have used Type K (heavy) copper piping the likelihood of a pipe rupture would be significantly minimized or the eventual pipe failure would be postponed for a much longer period of time.
John Williamson
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