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Physical installation of earth electrode

Ziggie

A couple of references to earth electrode have stated that they are driven into the ground leaving 3 inches above ground and the other stated not more than 12 inches above ground. The on-site guide figure 2.4.3 shows one with the connection point above the ground.

I have also seen discussions where the rod is put in a pit with the argument that if there’s 240 volts around ( in exceptional circumstances) then animals would be affected up to 2.5 meters from the ground point.

I don’t see anything in the regs that determine the proper method .

Which one is safer?

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  • 0

    I am slightly concerned that a child could be standing in water puddle with the fault being present and gets electrocuted by the difference in voltage that might exist.

    The risk is the same for any metallic part connected to the consumer's earthing system - especially outside - everything from outside taps to class I light fittings to electric vehicles on charge. In practice the risk is very low - in an installation that complies with BS 7671 the earthing system shouldn't persist at above 50V for any significant lengths of time (e.g. due to leakage currents) - and earth faults that could raise the system above that should clear within 1s (if on a large final circuit or distribution circuit) or 0.2s on more usual final circuits.

       - Andy.

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  • 0

    I am slightly concerned that a child could be standing in water puddle with the fault being present and gets electrocuted by the difference in voltage that might exist.

    The risk is the same for any metallic part connected to the consumer's earthing system - especially outside - everything from outside taps to class I light fittings to electric vehicles on charge. In practice the risk is very low - in an installation that complies with BS 7671 the earthing system shouldn't persist at above 50V for any significant lengths of time (e.g. due to leakage currents) - and earth faults that could raise the system above that should clear within 1s (if on a large final circuit or distribution circuit) or 0.2s on more usual final circuits.

       - Andy.

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