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Thread: Foundation earth

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    Foundation earth

    I am building a new house .any thoughts on earthing.
    Earthing a spike to the foundation steel ?
    Sinking a earth spike in the bottom of the trenches ?

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    Diamond Member AndyD's Avatar
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    Depends very much on the area. In some areas you can knock in a 6-8 meter earth spike and you get an Ra reading of 2 or 3 ohms. In other areas (from bitter experience) you can install earth mats, copper lattice in a bentonite filled trench under the foundations with an 8 meter spike in each corner of the foundations and strapping to the rebar of the foundations and still only come out with a 40 ohm earth impedance. Do some homework on the area and decide from there what lengths you may need to go to.
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