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)
- section i… Is the supply characteristic always referring to the incoming supply
- 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)
- Is the supply characteristic the supply to the whole site or the supply to just this board
- 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?
