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Lightning electrodes

lyledunn

A relatively small parish church has 8 down conductors connected to rod electrodes. Each electrode measured separately ranged from 215 ohms to 12 ohms with the overall value being around 8 ohms. Now I am aware that the overall value should be less than 10 and that each individual electrode should be no more than 8x10. We have one at 215 and one at 135, the others meeting that requirement. It is easy for me to advise that the system does not meet code but I do not have the expertise to assess the implications of the situation. I would appreciate your opinion. 

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    Sorry David, indeed it doesn’t show much. I was attempting to provide a picture of the arrangement at each pit. As you can see, the top of the electrode isn’t much bigger than what would be used in a wee domestic TT job. The down conductors are flat approx 38x3mm covered  in a plastic material. This goes below ground and is attached to the top of the rod some how. There appears to be a hessian type material wrapped around the connection which prevents inspection of the final connection. Rod resistance at this one measured around 215 ohms using the electrode resistance test on my megger 1741. Much  the same result was achieved using the loop method and the DNO earth. 

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    Sorry David, indeed it doesn’t show much. I was attempting to provide a picture of the arrangement at each pit. As you can see, the top of the electrode isn’t much bigger than what would be used in a wee domestic TT job. The down conductors are flat approx 38x3mm covered  in a plastic material. This goes below ground and is attached to the top of the rod some how. There appears to be a hessian type material wrapped around the connection which prevents inspection of the final connection. Rod resistance at this one measured around 215 ohms using the electrode resistance test on my megger 1741. Much  the same result was achieved using the loop method and the DNO earth. 

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