pdcelec said:Are you sure it is TT all the way and not tapped off from somewhere else which is TN? Does sound low for a TT.
FWL_Engineer said:Whilst this is low, even by TN-C-S standards, I would not worry about it unduly as there is obviously a very good earth path. What sort of building is it?
plugwash said:it could be a TN-S with the connection point outside your property. it could also be one of the water/gas bonds giving a low impedance path via someone elses system.
another possibility is a N-E fault in the installation (possiblly cross cuircuit or from a cuircuit to some kind of pipework)?
what happens if you disconnect the 3 10mm earths from the CU and loop test them seperately.
you DON'T get those kind of readings from a rod alone! it could be something totally innocent like pipework to other houses or it could be something worse like a NE fault you really need to find out.
An NE fault on say a short cable to a cooker circuit might cause this, effectively giving you an earth reading rather like PME - but, without the proper PME precautions being in place. Mind you, round our way 0.15 ohms is quite low for an L-N loop reading too. - Usually see a kilamp or so as the highest PS-CC for an LN fault.N-E fault is unlikely to give you a low Earth Loop reading. More likely there is an Earth plate in the ground that does several properties or there is a metallic foundation in the ground from previous constructioon of the site.
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