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Errroneous Earthing.

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In the past I have found a metal outside bulkhead light earthed by a wire connected to a steel screw and washer that was just screwed into the brick wall below the light.

Yesterday I came upon a 50s/early 60s installation with no earthing at lighting points. Some brass plated light switches had been added by the previous owner. A sticker on the back of the brass switches said that they must be earthed, so the installed had amateurishly connected a wire from the brass plates to the central back box securing screw. The metal back boxes were unearthed though.

Z.

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    When we moved in to that condo and decided that RCDs might be a good addition I discovered that all three airconditioners were running between L & E suggesting that we had TN-S or TNC-S. A fact borne out by the very sensible loop via the balcony railing. So in reality the earthed steelwork was only inches below the balcony surface.

    Now we have our house (since 2012) the roof steel actually measures better than our 2.4m rod! We are on Bangkok clay and 16m driven piles, the steel whilst not actually intentionally bonded does go all the way into the piles.

    We had a direct lightning hit to the roof a few years back. Total damage was two ridge tiles, a lump out of Madam's solid teak ($$$) barge boards and the LNB of the satellite receiver.

    Happy Loy Krathong to all, no floating on the river this year (again), the swimming pool will have to do.

     

    f80bb64c02171ca12c46ab7582c375c9-original-55875.jpg
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  • 0

    When we moved in to that condo and decided that RCDs might be a good addition I discovered that all three airconditioners were running between L & E suggesting that we had TN-S or TNC-S. A fact borne out by the very sensible loop via the balcony railing. So in reality the earthed steelwork was only inches below the balcony surface.

    Now we have our house (since 2012) the roof steel actually measures better than our 2.4m rod! We are on Bangkok clay and 16m driven piles, the steel whilst not actually intentionally bonded does go all the way into the piles.

    We had a direct lightning hit to the roof a few years back. Total damage was two ridge tiles, a lump out of Madam's solid teak ($$$) barge boards and the LNB of the satellite receiver.

    Happy Loy Krathong to all, no floating on the river this year (again), the swimming pool will have to do.

     

    f80bb64c02171ca12c46ab7582c375c9-original-55875.jpg
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