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Earthing Schematic Query

me1899
Hi all, hope you are well.


Just a quick question on the attached snippet from a drawing - basically for an energy centre and on their earthing schematic all earth bars are shown as follows:

2d8a9081c4e99b3842ad8d5034691cf8-huge-image.png

186e551d172cd9b4b75db7f34dac3af9-huge-image.png


The big text above is the drawing revision text saying the change was deliberate.


I would have thought the above is not right - the main conductor should be connected to the other side of the disconnecting link.


What they have done on site is install a different earth bar as follows:

3c6872262d573da80ef744d085327faf-huge-image.png


Disconnecting link is wrong way round?


I am not sure of the rationale behind this?


Any ideas?
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    I'm with Mike - it does sound rather like someone has decided that they don't really need a disconnecting link on the earth bar and would prefer the additional reliability of having everything solidly bolted together.


    It may be that a removable link for testing is only required at the main earth terminals - and any anciliary ones are to be treated as simple terminals/bars (but if they've already been purchased/installed with disconnecting links the pragmatic if rather untidy solution is just to make all the connections on the same side).


    Just my guess though.


       - Andy.
Reply
  • 0
    I'm with Mike - it does sound rather like someone has decided that they don't really need a disconnecting link on the earth bar and would prefer the additional reliability of having everything solidly bolted together.


    It may be that a removable link for testing is only required at the main earth terminals - and any anciliary ones are to be treated as simple terminals/bars (but if they've already been purchased/installed with disconnecting links the pragmatic if rather untidy solution is just to make all the connections on the same side).


    Just my guess though.


       - Andy.
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