On Thu, Aug 30, 2018 at 11:47 PM, Warin <61sundow...@gmail.com> wrote:
Earthing systems are usually mandated and common to some bureaucratic > boundaries. > Perhaps that is the case where you are, but here in the UK it's a matter of what the power distribution company provides. In a largely rural district with small towns/villages and many farms, it is possible to find TN-C-S, TN-C, TN-S and TT in the same county. Possibly IT too, in mines. All are legal according to BS 7671 (aka IET Wiring Regulations), although it does specify special circumstances in which some of them are not permitted (petrol stations, static caravans, mines, etc.) So that's five different types in one country (the UK), most of them will be found within a single county and I'd guess you can find three of them in my town. -- Paul
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