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TT to TN-C-S

Zoomup
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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    Same here zoom - I get every TT PME'd out of existence if possible but it isn't free! WPD charge £150.00 to insert a foot of 16mm earth into the neutral termianl on the cut-out.

    Mind you, the last one couldn't be done because the installation was end-of-line and the L-N loop was 0.45 ohms, so unless burying the last 15 metres or so to the house from the pole and ground-rodding it to death in the trench would solve the shortfall it was a no go. They wanted £1800 to bury the b***** though!
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  • 0
    Same here zoom - I get every TT PME'd out of existence if possible but it isn't free! WPD charge £150.00 to insert a foot of 16mm earth into the neutral termianl on the cut-out.

    Mind you, the last one couldn't be done because the installation was end-of-line and the L-N loop was 0.45 ohms, so unless burying the last 15 metres or so to the house from the pole and ground-rodding it to death in the trench would solve the shortfall it was a no go. They wanted £1800 to bury the b***** though!
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