M
mamba
Have been asked to replace an old re wirable CU with a RCD 17th in a small domestic property. Prior to removing old CU did a full check on all final ciricuits. On the light circuit discovered x3 - 1.5 mm wired into a 6amp fuse. On further investigation discovered x1 was for door bell tranny no issue there. The other 2 appear to be a ring for the lights as - Put one leg into fuse and power on all the lights work and leg 2 which is not terminated into fuse is LIVE. Remove leg one and put leg two in same senerio all lights work and and leg one is Live. On futher enquiry from Client he advises that he had extension built about 8 years ago and they extended lights. He also advised me that as he had recently had the whole house redecorated and painted and he did not want me to start removing light fittings - switches etc for fear of decrotive damage which makes fault finding impossible. I cannot see any reason why a light circuit cannot be wired as a ring not your every day design but if protected by a 6 or 10 amp mcb should not be an issue. then to also to put a warning label on circuit chart and within the CU warning of this situation. Or possibly remove and islolate one leg completley. Any other suggestions welcome