Can anybody help, I am looking to rewiring an old three storey house for a friend. I've not been in the trade very long. I am looking at an old fuse box with a cut out with a YEB sticker over, which gives you an idea how old the cut out is. There are two cables entering the cut out and two exiting it, to the meter. There is no sign of an MET or indications of a TT. I have not removed the cover yet. Can anybody suggest what type of system I have here. The only sign of an earth is a 2.5mm wire from a water pipe going into the back of the old fuse box. Would I need to contact the DNO to have this altered.