Please could somebody Try & help me. My girlfriends lighting circuit keeps blowing the fuse wire. Have tested the insulation from the consumer box with a megger & it indicates a short between neutral & earth as well as live & earth. I have taken the outside lights out of the system and checked all light fitting connections (which were tight). The 5 Amp fuse wire explodes apart almost instantaneously with no lights in the on position. Have checked under the floor in the bathroom for any water and its as dry as a dry thing. If any one has any ideas as to where the fault could be or how now to locate it I would be the most grateful man in the world and that means the girlfriend would also be grateful to me...lol