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  1. #1
    Join Date
    Feb 2012
    Location
    Toronto Canada
    Posts
    1,090

    House grounding rods???

    What are they installed for??
    My teacher says it's only for lightning
    I say it's lightning and leakage of power and to ground the circuit cause it's not all copper these days.

    What do you guys think??

  2. #2
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    18,549
    Lightning is the number one reason we have rods, now a mere sibling in a family of Grounding Electrodes.

    The second purpose is to provide a local connection between the neutral and ground. At the service entrance, all equipment grounding conductors are tied to the service neutral by means of the system bonding jumper. In this way, the neutral (the uninsulated wire that has the two or three insulated wires wrapped around it) is not the only way that unexpected energy can find its way to an earth ground. The transformer where the power is supplied has the center tap of its secondary tied to an earth ground, and that is also where your service neutral ends up, too.


    Any questions?

  3. #3
    Join Date
    Sep 2011
    Location
    nort jersey
    Posts
    19
    question how do you guys drive the grounding rods into ground
    i did one last week for a generator, used my jackhammer to drive it into ground it took about 3 min and head of the rod kind of stuck in jackhammers chuck

  4. #4
    Join Date
    May 2011
    Location
    Oklahoma
    Posts
    362
    Post hole driver, then sledgehammer, then sawzall if I hit a rock.

  5. #5
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
    Posts
    5,042
    I've always had luck with a sledge. I have a mini-sledge, and if I have to use the big sledge I'll break it out.

    FYI, matt was joking about cutting them off. We all know you have to hit it a few times after you cut them off, so the inspector doesn't see a raw edge.
    "Better tell the sandman to stay away, because we're gonna be workin on this one all night."

    "Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."

    "Just get it done son."

    Dad adjusted

  6. #6
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    18,549
    Rods are installed according to 250.53 G. You can drive a rod at an angle up to 45 degrees to avoid rock.

    Just to clear up a term I mentioned:

    The jumper for bonding at the panel is the MAIN bonding jumper. The System bonding jumper is used where to have a transformer in a store (for example) where the service is 460v, and the transformer is there to supply power to the outlets, lighting, equipment, etc, that needs 120v. In the transformer you have the SYSTEM bonding jumper, as it is a "separately derived system."
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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