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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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    lyledunn: 
     

    By the way, no main bond to LPS and no SPD. Just more issues to explain the consequences of!

    Care needed here. If the LPS was designed to BS 6551, it may well not comply with BS EN 62305, and therefore improvement to the whole system (and re-assessment) may be required before fitting SPDs and making the bond … again from experience and involvement with other infrastructure. 

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

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  • 0

    lyledunn: 
     

    By the way, no main bond to LPS and no SPD. Just more issues to explain the consequences of!

    Care needed here. If the LPS was designed to BS 6551, it may well not comply with BS EN 62305, and therefore improvement to the whole system (and re-assessment) may be required before fitting SPDs and making the bond … again from experience and involvement with other infrastructure. 

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

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