Discuss Pme TT in same farm building in the UK Electrical Forum area at ElectriciansForums.net
Doesn't matter. There is a high shock risk should you introduce a derived earth into a true earth (TT) environment. Why can't you TT it?Sorry I should have said it's a storage building not used for livestock. Anybody got any ideas to a solution?
That is a high risk strategy considering TN-C-S is not permitted in farm buildings.
If the power is coming from a transformer up a pole then it will be TT
Or is it easier to sink a new rod to avoid any doubt?
Sorry to bring this back up but I would like thoughts on my plan based on the above advise.
I'm going to bring 3phase PME supply across from main building to metal outbuilding but isolate the earth externally.
This means that I'll be TTing this new supply but what I need advise on is whether I sink a new Rod for this or would it be possible to use the Rod already installed for the current single phase TT supply the building uses (see original post for background info)
Thanks in advance
Yes you're right had time to think about it , thay normally have a earthing mat at the bottom of the pole / transformerNot necessarily, it's perfectly possible to have TNCS or TNS from a pole mounted transformer
You'll need to consider what to do about having the two different earthing systems in installation and so be no further forwards.
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