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Sub Boards or Incomer??

tonydon

Hi

We have a large commercial site fed by 2 onsite substations…

The substations feed panel boards in our side of the subs  i.e. Incomer

The panel boards then feed sub boards within the site, some of which will feed other downstream boards

Our questions are (for condition reporting)

  1. section i… Is the supply characteristic always referring to the incoming supply
  2. when testing a board is the supply protective device the supply feeding this particular board i.e. potentially an mcb in another upstream board that supply's this board … or  is the supply protective device the device on the incoming supply to the site  i.e this will then be the device listed on each board (the same throughout the site)
  3. Is the supply characteristic the supply to the whole site or the supply to just this board
  4. the ZE cannot be reasonably ascertained by test,  but, we also cannot get our supplier to give us this reading by inquiry  What should we do?

 

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    I concur with AJ that the forms in Appendix 6 are likely unsuitable for the larger installation. I often deal with large rambling sites such as hospitals and industrial locations with many buildings served from some remote common source to which access is often restricted. If I cant get the relevant supply characteristics I simply declare this (I use my own template forms and declare as a limitation). Not once in all the years I have been involved in IandT has anyone ever questioned this. It would be great if they did as it might indicate that someone has at least taken the trouble to read the damn things!

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    I concur with AJ that the forms in Appendix 6 are likely unsuitable for the larger installation. I often deal with large rambling sites such as hospitals and industrial locations with many buildings served from some remote common source to which access is often restricted. If I cant get the relevant supply characteristics I simply declare this (I use my own template forms and declare as a limitation). Not once in all the years I have been involved in IandT has anyone ever questioned this. It would be great if they did as it might indicate that someone has at least taken the trouble to read the damn things!

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