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    Hilbert's Avatar
    Hilbert Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Jul 2, 2011, 09:57 PM
    Lost Water supply ground, How do I fix this ?
    My 200 Amp service was bonded by two driven rods and connection to my copper piping. I bought this house used and without much history. At some point it seems like the Water company changed the main line to a poly 3/4" line that hooks to my existing copper piping. Now all the copper pipe in my house is no longer grounded by the supply pipe. What should be done ? Should I drive another rod where the ground hooked up to my piping and connect there ? I am working in a crawl space, driving a rod would be tough. If I don't need to do a new rod should I disconnect the ground from my copper piping ? Thanks for your help
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Jul 3, 2011, 03:05 AM
    I suspect you will not need to do anything.

    Confirm that there is a min of #6 copper wire connecting the neutral/ground bar in the panel with the Main Breaker to the two ground rods, and a min #8 copper wire from the neutral/ground bar to the copper cold water pipe in the home.

    The two ground rods ground the neutral/equipment ground of the electrical system, and the wire to the copper water pipe bonds the water pipe to equipment ground.

    Do not disconnect the wire bonding the water pipe.
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #3

    Jul 3, 2011, 06:16 AM
    Quote Originally Posted by tkrussell View Post
    ..., and a min #8 copper wire from the neutral/ground bar to the copper cold water pipe in the home.
    I know you know this, and I suspect it was just a typo, but this needs to be a #4cu, not #8. sized for the 200A service.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #4

    Jul 4, 2011, 04:27 AM
    I hate when I do that, zoned out and forgot the 200 amp was posted had 100 Amp in mind.

    It needs to be a #4 copper.
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