The original supply was via lead sheath cable, TN-S. At some point the owner has had the meter moved and the supply is now via a two core concentric cable which has been jointed underground to the old lead sheath cable. I think this was done as a "foreigner" by a guy from EON. I assume that the neutral and earth have been jointed together in the UG joint. The service head is a TN-C-S type and an earth taken in 16mm from here to a terminal block.
My question is, is this now a valid TN-C-S system ? Or should the earth be connected via a rod or the original sheath cable?
The Ze measures a very low 0.1 Ohm
My question is, is this now a valid TN-C-S system ? Or should the earth be connected via a rod or the original sheath cable?
The Ze measures a very low 0.1 Ohm