Hi,
I am refurbishing my house and changing the old switches as part of the refurbishment. They are plastic surface mounted, I want to put flash switches in metal back boxes.
It turned out there are back boxes behind the switches but they are old type - smaller than the ones I bought from Screwfix, no earth clamp, and there are no lugs, so I can't use them. The cables run through metal conduits, connected to the boxes with clamps (or brackets?). From what I found in the loft, the house has been rewired at least ones, there are earth clamps attached to the top of the conduits and something that looks like steel wire but it is cut near the clamps. I guess those are the remainings of the old earthing.
I replaced the old metal boxes. Can I leave the metal conduit in place with the cable inside, provided the conduit is not attached to the box in any way. If I leave them, do they have to be earthed? If so, can I run earth wires from the old clamps in the loft inside the conduits and connect them to the earth clamps in the back boxes? Or I should connect all the conduits with a single wire which terminates in the CU as it used to be when the house was built?
I am refurbishing my house and changing the old switches as part of the refurbishment. They are plastic surface mounted, I want to put flash switches in metal back boxes.
It turned out there are back boxes behind the switches but they are old type - smaller than the ones I bought from Screwfix, no earth clamp, and there are no lugs, so I can't use them. The cables run through metal conduits, connected to the boxes with clamps (or brackets?). From what I found in the loft, the house has been rewired at least ones, there are earth clamps attached to the top of the conduits and something that looks like steel wire but it is cut near the clamps. I guess those are the remainings of the old earthing.
I replaced the old metal boxes. Can I leave the metal conduit in place with the cable inside, provided the conduit is not attached to the box in any way. If I leave them, do they have to be earthed? If so, can I run earth wires from the old clamps in the loft inside the conduits and connect them to the earth clamps in the back boxes? Or I should connect all the conduits with a single wire which terminates in the CU as it used to be when the house was built?