Existing PME/TNS supply at service position. Run a minimum of 10mm 3 core SWA cable to your external location, following all approved cable installation procedures. Terminate in to a Metal Clad Dis-Brd. Link SWA Earthing Tag to DB-1's MET with 4mm, despite it being a Metal Clad Dis-Brd. (Belts & Braces!) Drop an Earth Rod in as close as possible to DB-1 and connect back to DB-1's MET with 10mm Bond any metal services entering the remote building with 10mm Bond any exposed metal framework of the building with 10mm Resultant installation has an excellent Ze DB-1 Resultant installation is tied down to 'True Earth' at it's remote location thus avoiding any 'potential' problems! Resultant installation avoids the need for expensive Time delayed RCD Split Boards! Comments and critisim gartefully received!