My new abode is currently TT with a reported Ze of 190 ohms. It's sitting on granite and the prospect of driving in multiple rods is not particularly appealing (which, presumably, is why we haven't been able to locate from the previous owner). I've contacted WPD and they confirm that PME is available. Is there any reason why I would not accept it? (Apart from the fact that WPD want to charge £163.03 whereas my previous DNO did it for free!) We're very rural and the supply is overheads with a pole mounted tx in the garden.
When ground conditions prevent driving of earth rods, I have achieved good results by use of bare copper earth tape buried in a trench, the material used fir lightning conductor down leads.
A reasonable length gives a good low resistance connection, much better than burying a short rod.
In the case of extending a TT system to an outbuilding via buried SWA , a copper tape buried at the same time serves the dual purpose of an earth electrode, AND a substantial bonding conductor that will handle any diverted neutral currents.
When ground conditions prevent driving of earth rods, I have achieved good results by use of bare copper earth tape buried in a trench, the material used fir lightning conductor down leads.
A reasonable length gives a good low resistance connection, much better than burying a short rod.
In the case of extending a TT system to an outbuilding via buried SWA , a copper tape buried at the same time serves the dual purpose of an earth electrode, AND a substantial bonding conductor that will handle any diverted neutral currents.
