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TT to TN-C-S

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I advised a customer to have a new P.M.E. earth terminal installed by U.K.P.N. This was done. When U.K.P.N. attended and tested, the men found a weakness/imperfection/fault at the top of the nearest pole. A repair was carried out.


In my area many premises have old T.T. earthing. As a mater of course I would recommend that all T.T. premises be converted to TN-C-S where permissible, to improve the safety of the installation. 


Today I visited a house under renovation. The earthing conductor to an earth rod had been disconnected in the garden. The whole house was very dangerous due to an old and unearthed installation. The old Voltage operated earth leakage circuit breakers were unreliable. I disconnected many circuits.


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Z.
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    Zoomy, I cannot see any problem with keeping two perfectly decent earths, but those cleverer in here might disagree.


    Andy, without driving up to have a butcher's (not essential travel!) I am pretty sure that it is not like that. So transformer strung between a couple of poles. LV to a pole nearby, presumably where it is earthed. Then the cables spread out into what was once a single estate. I suppose that an earth (the existing rod - 80 Ω) could be used, but we are still stuck with the PSSC of 0.480 kA. The issue in hamlets (if you can call it that) is that some premises are just going to be too far from the transformer to get a DNO's earth.
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    Zoomy, I cannot see any problem with keeping two perfectly decent earths, but those cleverer in here might disagree.


    Andy, without driving up to have a butcher's (not essential travel!) I am pretty sure that it is not like that. So transformer strung between a couple of poles. LV to a pole nearby, presumably where it is earthed. Then the cables spread out into what was once a single estate. I suppose that an earth (the existing rod - 80 Ω) could be used, but we are still stuck with the PSSC of 0.480 kA. The issue in hamlets (if you can call it that) is that some premises are just going to be too far from the transformer to get a DNO's earth.
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