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Caravan Hook-Up Point Earthing.

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Greetings,


 I was out and about today at a large sports ground field that has 5 caravan hook up points, two pairs and a single all separated by many hundreds of metres.


I had to test them as the new season will start soon. The sports field is very large and has a few flood lights situated around it fixed to high metal lighting columns.


I came to the first twin 16 Amp caravan hook-up point. It had a single R.C.D. and two blue sockets in an all insulated enclosure cable tied to a lighting column.


I could not confirm the earthing arrangement as I had no access to the main club house meter position.


So I carried out a loop test at the sockets and had a result of 1.41 Ohms, far too low to be a TT earthed socket.


What then was my concern?


Z.
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  • 0
    broadgage:

    A TT earth loop reading of 1.41 ohms is in my view just about possible if the TT system includes large steel lighting columns that give an excellent connection to true earth.


    The next more distant hook-up point (300+ metres away) had a loop reading of about 150 Ohms. It was earthed by a large redundant metal light column and a smaller metal pole as well.


    Z.


Reply
  • 0
    broadgage:

    A TT earth loop reading of 1.41 ohms is in my view just about possible if the TT system includes large steel lighting columns that give an excellent connection to true earth.


    The next more distant hook-up point (300+ metres away) had a loop reading of about 150 Ohms. It was earthed by a large redundant metal light column and a smaller metal pole as well.


    Z.


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