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TT to TN-C-S

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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  • I may be missing the point a bit but if a supply is being made PME then the DNO would have to put earth steaks in at various poles isn't it every 4th pole? That would get rid of the hi loop impedance problem. Or is this a case where a neutral  is being bonded to earth  without the rest of the system being staked.
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  • I may be missing the point a bit but if a supply is being made PME then the DNO would have to put earth steaks in at various poles isn't it every 4th pole? That would get rid of the hi loop impedance problem. Or is this a case where a neutral  is being bonded to earth  without the rest of the system being staked.
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