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Thread: earth electrode dillema

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    Junior Member markthespark's Avatar
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    earth electrode dillema

    Hi guys, perhaps the following question will get some interesting answeres!! On a huge alteration job done on a house in Tamboerskloof, built against the mountain of solid rock, I need to install an earth electrode. No soft ground at all! I get a beatiful 8 ohm reading on the foundations reebar setup, but unfortunately not acceptable. One of the council inspectors suggest a mound of old disused copper waste imbedded into a concrete slab. Any other suggestions from other members??

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    an expensive earth mat will work. or just lay a 10mm bare copper length of cable in a trench.

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    Diamond Member AndyD's Avatar
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    Lay an earth mat under foundations before the concrete is cast. If you're getting an 8 ohm Ufer reading from the existing rebar in the slab then weld a terminal onto it and use that as well. What size supply are you dealing with? Whats your required earth impedance (Ra)?
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