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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

    All depends on location and use of the rod. Most domestic rods will just have the small plastic enclosure around the top just sticking out enough to avoid damage etc but can easily be located for testing complete with the required label. Ideally a proper recessed pit is the best option depending on budget. GN8 has more info but basically you need to protect the earth connection against damage and corrosion whilst being able to safely test.

  • 0 in reply to Colin Haggett

    Thanks Colin,

    I would have expected some rules like the enclosure should only be opened by a tool.

    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.

    trials have shown that voltage at the surface moves from 240 volts to 25 volts at around 2.5 meters from the rod .

    clearly an animal with front legs within 2.5 meters of the rod and back legs over this, then the diff is 25v which could be fatal.

    cats and dogs and young children might be at risk. 

Reply
  • 0 in reply to Colin Haggett

    Thanks Colin,

    I would have expected some rules like the enclosure should only be opened by a tool.

    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.

    trials have shown that voltage at the surface moves from 240 volts to 25 volts at around 2.5 meters from the rod .

    clearly an animal with front legs within 2.5 meters of the rod and back legs over this, then the diff is 25v which could be fatal.

    cats and dogs and young children might be at risk. 

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