Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 15 replies
  • Subscribers 32 subscribers
  • Views 1929 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

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.


Get upgraded. It's FREE.


Z.
Parents
  • 0
    Chris Pearson:
    Zoomup:
    Chris Pearson:

    I expect that there may be a range of opinions on this one!


    In any event, the premises must be sufficiently close to the transformer and the DNO must be willing.


    I have never had a refusal by U.K.P.N. to install a new P.M.E. earth terminal yet Chris. We have been treated to new A.B.C. over head cables out here in the sticks. And don't we need them with the strong winds coming off the North Sea!




    Best PSSC that I have recorded at Daughter's house was 0.480 kA. So that's a best case of Ze = 0.48 Ω and no chance of PME there. (Nice shiny new ABC too.)




    Perhaps down the line they need to get the wire brush and metal polish out at pole tops. Does your daughter live off planet Chris?


    Z.


Reply
  • 0
    Chris Pearson:
    Zoomup:
    Chris Pearson:

    I expect that there may be a range of opinions on this one!


    In any event, the premises must be sufficiently close to the transformer and the DNO must be willing.


    I have never had a refusal by U.K.P.N. to install a new P.M.E. earth terminal yet Chris. We have been treated to new A.B.C. over head cables out here in the sticks. And don't we need them with the strong winds coming off the North Sea!




    Best PSSC that I have recorded at Daughter's house was 0.480 kA. So that's a best case of Ze = 0.48 Ω and no chance of PME there. (Nice shiny new ABC too.)




    Perhaps down the line they need to get the wire brush and metal polish out at pole tops. Does your daughter live off planet Chris?


    Z.


Children
No Data

Community Rules & Guidelines