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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.
Parents
  • It is a 3 ph & N supply

    Actual TT loop value on site is around 14 ohms so nice and low. I would have thought that it wouldn't take too much to drop 0.1 of an ohm to get it to meet  the PME requirement.
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  • It is a 3 ph & N supply

    Actual TT loop value on site is around 14 ohms so nice and low. I would have thought that it wouldn't take too much to drop 0.1 of an ohm to get it to meet  the PME requirement.
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