He has a three phase TN-C-S incomer to his calf shed with a concrete floor covered in Part P
Certainly doesn't seem ideal for a PME supply (although I'd be a lot less worried if it was PNB).
So from what I have read above, if I do the job according to the regs I have to TT the installation or at least the second board which would require a new TP board with single phase RCBOs and TP RCBO for a submain to third board that has been wired underground in concentric and put in rods to the sandstone. Then I can put a double outside socket fed by SWA. Cost £700 plus.
Or stick in a say 4-pole 300mA S-type in an insulating enclosure (REC 4 kind of thing) in the tails upstream of the first DB and a rod - and leave all the existing switchgear as is? Then just add some DP 30mA RCDs downstream as and where you need them. Not ideal of course, but a lot cheaper.
He has a three phase TN-C-S incomer to his calf shed with a concrete floor covered in Part P
Certainly doesn't seem ideal for a PME supply (although I'd be a lot less worried if it was PNB).
So from what I have read above, if I do the job according to the regs I have to TT the installation or at least the second board which would require a new TP board with single phase RCBOs and TP RCBO for a submain to third board that has been wired underground in concentric and put in rods to the sandstone. Then I can put a double outside socket fed by SWA. Cost £700 plus.
Or stick in a say 4-pole 300mA S-type in an insulating enclosure (REC 4 kind of thing) in the tails upstream of the first DB and a rod - and leave all the existing switchgear as is? Then just add some DP 30mA RCDs downstream as and where you need them. Not ideal of course, but a lot cheaper.
