I have a new client with an estate home. They have three seperate coldwater feeds to the house; one on the south end, one in the middle, and one on the north end. They are having issues with pitting in the coldwater pipe run under the slab in the center section of the home only. I understand that they have had to rip up the floor twice in the last 5 years and replace a pipe. The plumber told them it was electrolysis and told them talk to an electrican. The electrican that wired the home does not want to be involved in finding a solution so I was asked look at the problem.
Three seperate underground water feeds from a single meter I am told was because of structural issues. I currently do not know if they and continiously fed underground with copper around the exterior of building or if there is PVC between the feed points.
I can tell you that I do not think the home itself is grounded properly. There is a 400Amp split main panel on the house but the ground wire is run in a pvc conduit along with a subfeed to the detached garage building where it loops through the load center and disappears out through a knockout in the panel. I can find no uffer/cw bond/gas bond at either building.
I think what I need to do is to tie all three feeds with a common bond back to the the main service so that I will have an equalateral plane. What I don't want is to be inducing an isolated problem into the other two areas of the home however. I am open to hearing everyones ideas.
I have read about ph balances and other water-bourne sources of pitting but I am not sure that is the correct route to examine if it is only happening in 1 out of 3 areas (6 areas is you include additional out -buildings).