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You can use TT, TN-S or TN-C-S but certain requirements are needed should the latter be employed and some suppliers may not provide TN-C-S for agricultural sites. TN-C is the only system not to be used and I have yet to come across this in the UK.Yeah, I'm seeing overheads converted to PME here too, but 705.411.4 states TN-C system shall not be used (705 is relevant because there are animals present), so unless I'm misunderstanding this regulation I'm required to use TT earthing for this work.