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Testing Lightning Conductors and Earth Electrodes.

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I am just curious. A local church is having its lightning protection system inspected and tested any A.N. Other. It is an old Norman church with a tall tower.


The downleads are copper and have no disconnection points above the earth electrodes. I have seen inspection joints on other buildings so that the earth electrodes can be independently electrically tested.


How is testing carried out when the downleads are continuous please?


Thanks in advance.


Z.

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  • Former Community Member
    0 Former Community Member

    Sparkingchip:

    Am I right in thinking the clamp test will only work on multiple interconnected electrodes, so for a single earth electrode you need to use long test leads to temporary stakes?


     Andy 




     

    The test clamp only isolates the electrode under test - generally where at the end of every down conductor, there is an electrode - and a test clamp to just separate the connection (above ground rather than scrabbling about in the electrode pit).


    Once you have the electrode isolated, then typically a fall of potential or wenner test will give you a value if you have a suitable reference electrode (and usually you also need a "moveable" electrode for the so called 4 wire test) 


    Regards


    OMS
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  • Former Community Member
    0 Former Community Member

    Sparkingchip:

    Am I right in thinking the clamp test will only work on multiple interconnected electrodes, so for a single earth electrode you need to use long test leads to temporary stakes?


     Andy 




     

    The test clamp only isolates the electrode under test - generally where at the end of every down conductor, there is an electrode - and a test clamp to just separate the connection (above ground rather than scrabbling about in the electrode pit).


    Once you have the electrode isolated, then typically a fall of potential or wenner test will give you a value if you have a suitable reference electrode (and usually you also need a "moveable" electrode for the so called 4 wire test) 


    Regards


    OMS
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