What type of Earth does the electrical supply to the static caravan have ? Is it a PME ( TN-C-S ) supply ?
Would fitting this new socket result in a PME supply Earth being exported from the caravan to appliances outide the caravan ?
Caravan Outside Socket
- Thread starter mjtefc9
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Would fitting this new socket result in a PME supply Earth being exported from the caravan to appliances outide the caravan ?
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TNC-S… Yes the socket will be used for a dryer I believe. The socket will be on its own circuit from the DB
Irrelevent.
The Earth from the TN-C-S is in reality the incoming Neutral ( PEN Protective Earth Neutral ) which in the event of a fault in the supply ( open circuit PEN ) results in the possibility of the "Earth" in the caravan being pulled to 230 V. Exposed metal work on items that are Earthed will become Live. Not a serious danger for anyone inside the caravan ( equipotential zone ) but could be lethal for anyone standing on the ground outside the caravan and touching exposed metal of an Earthed appliance.
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This is where I could get more education good sir. I understand the logic and theory of an open PEN fault. So you think I need a separate TT supply for the outside socket?
Very much so
If the ground around the dryer can be damp ( or otherwise conductive ) then I would have TT from the caravan to the outside socket through a RCD and the Earth from an effective Ground electrode.
And yes my opinion is caravans should have TT supplies with effective Ground electrodes. ( based on experience of the sometimes dubious supply cabling on caravan parks )
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If this is indeed a leisure/holiday static, hope that the caravan owner has permission from the site manager for all this - otherwise next job will be a return to remove it.
Well I think that might be a starter for ten certainly.
I think consideration should be given to the TNC-S. TT, PME, PNB, scenario if the Caravan is on a caravan site/is metallic in structure/is in an open field were folk might be barefoot/ touching other earthy stuff/ Broken PEN (as you mentioned).
I would not like to make additions/alterations before knowing these things.
That being said the ZE is 1.13
which I find very, very low !
Probably not only the earth spike is being measured then. Make sure that ALL other external earthy connections are removed.That being said the ZE is 1.13
They won't let me do it a the incoming.. but I'm okay in the caravan and they are certain its TT
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