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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: 
     

    gkenyon: 
     

    The test link would not be removed if the 2-clamp (or double-clamp) method is used? But I agree it's far from good practice not to inspect the connection of the tape to the electrode.

    The clamp method will still indicate a bad electrode. Our measurements varied significantly at each electrode whereas the previous results indicated around 4ohms at each point. 

    Agreed, when I've been involved with this kind of situation on periodic infrastructure inspections, degradation of each electrode is monitored, and, when it exceeds the limits of the standard, further investigation or, more frequently, replacement or repair of the electrodes exceeding the limits of the standard is  recommended (and usually carried out).

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    lyledunn: 
     

    gkenyon: 
     

    The test link would not be removed if the 2-clamp (or double-clamp) method is used? But I agree it's far from good practice not to inspect the connection of the tape to the electrode.

    The clamp method will still indicate a bad electrode. Our measurements varied significantly at each electrode whereas the previous results indicated around 4ohms at each point. 

    Agreed, when I've been involved with this kind of situation on periodic infrastructure inspections, degradation of each electrode is monitored, and, when it exceeds the limits of the standard, further investigation or, more frequently, replacement or repair of the electrodes exceeding the limits of the standard is  recommended (and usually carried out).

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