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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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    gkenyon: 


    Similarly, test results for earth electrodes should be compared to the correct standard the original design was conducted to.

    I had a thought that those familiar with BS 7671 and “periodic verification” might find this odd … the difference being that BS 6651 is apparently not fully compatible with its replacement (BS EN 62305), but the latter standard has much more involved than just the LPS … which means if the LPS is the only issue … well, there is no real issue … but if other matters come into play (such as bonding with the LV electrical installation earthing system, and SPDs), the former standard might not be up to the “challenge” and more work is required on the design front to determine whether the LPS needs to change to accommodate the other work.

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    gkenyon: 


    Similarly, test results for earth electrodes should be compared to the correct standard the original design was conducted to.

    I had a thought that those familiar with BS 7671 and “periodic verification” might find this odd … the difference being that BS 6651 is apparently not fully compatible with its replacement (BS EN 62305), but the latter standard has much more involved than just the LPS … which means if the LPS is the only issue … well, there is no real issue … but if other matters come into play (such as bonding with the LV electrical installation earthing system, and SPDs), the former standard might not be up to the “challenge” and more work is required on the design front to determine whether the LPS needs to change to accommodate the other work.

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