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Thread: multifamily residential service grounding and Bonding

  1. #1
    Join Date
    Jan 2010
    Location
    Houston, Texas
    Posts
    93

    multifamily residential service grounding and Bonding

    I have be asked to look at what is needed to ground and bond a multifamily residential service.
    there are 4 services in one area its is a very old home (4plex). no main breakers or ground rods.
    each is completely separated. thought about running a bond from panel to panel then to the ground rod
    and water pipe. Any suggestions would be very appreciated

  2. #2
    Join Date
    Dec 2006
    Location
    Chapel Hill, NC
    Posts
    26,413
    Are the panels and meters located on each individual unit? Is so then you need 2 rods for each setup. Water pipes, if metal also need to be bonded or used as an electrode if applicable.

  3. #3
    Join Date
    Jan 2009
    Location
    Easton, Maryland NEC: 2011
    Posts
    7,881
    4 services or 1 service and 4 meters and feeders?
    "Electricity is really just organized lightning." George Carlin


    Derék

  4. #4
    Join Date
    Jan 2010
    Location
    Houston, Texas
    Posts
    93
    they are all side by side with in 4' x 5' area sunk in to the outer wall with a door to cover them.
    and about 4 " apart meter can to meter can.
    is it ok to just add a clamp to each panel and go from panel to panel the to ground rod and water pipe?

  5. #5
    Join Date
    Jan 2010
    Location
    Houston, Texas
    Posts
    93
    4-plex each with its on service

  6. #6
    Join Date
    Jan 2009
    Location
    Easton, Maryland NEC: 2011
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    7,881
    I am not sure about 4 separate services, I was thinking of doing something like this off 1 service.

    "Electricity is really just organized lightning." George Carlin


    Derék

  7. #7
    Join Date
    Jan 2010
    Location
    Houston, Texas
    Posts
    93
    i was thinking something similar coming of #1 panel ground bar to the #2 ground Bar to the #3 ground Bar to the #4 ground bar then to ground rod and the water pipe.
    there is only about 5 breakers in each at the most the place is close to 70 years old.

  8. #8
    Join Date
    Jan 2009
    Location
    Easton, Maryland NEC: 2011
    Posts
    7,881
    I am not sure, but 250.24 does not seem to have provisions for tying 4 different services together with a panel to panel jumper.
    "Electricity is really just organized lightning." George Carlin


    Derék

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