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Hi need some advice re installation of a external 13amp socket to enable connection of a 13amp mercedes car charger. Socket would be spurred via SFCU from local ring main. External socket attached to external wall of main house. Earthing system TNCS. Would this arrangement be compliant ? Instruction manual with the car states can be plugged into a normal 13amp socket. But i have heard that various things regarding having to TT the supply socket re TNCS any advice appreciated