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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
  • I never knew about the 1 meter 1 volt rule that makes  sense here at peak times we lose aprox 19 volts ie 231 at house assuming it starts as 250 at the Tx we are within those limits which is good to know most of the time the voltage is around 238 or 9  so all good
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  • I never knew about the 1 meter 1 volt rule that makes  sense here at peak times we lose aprox 19 volts ie 231 at house assuming it starts as 250 at the Tx we are within those limits which is good to know most of the time the voltage is around 238 or 9  so all good
Children
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