My garage already has power for sockets and lights, but as part of the overall rewiring I need to make an assessment of it. The consumer unit end of the installation requires attention as I will be moving the circuit to a new unit where it will be covered by a separate 30A RCD protected circuit. The cable runs from the house underground but alongside the driveway and comes up throught the garage floor. It then connects into a switch-fuse unit, from which separate light and power circuits are taken. The cable, however appears to be 2 core but the exterior insulation is metal, so the cable is flexible but fairly rigid. The round conduit which it runs in underground is also metal.
So, how does this work? Presumably the metal cable is acting as the earth? Is this somehow then connected to the consumer unit to connect the earth circuit? Should I remove the whole lot and start again? I would like to be able to remove the cable from the conduit and run a new 3 core through it, but with the conduit being metal presumably that's not acceptable? I would like to avoid having to lay more conduit as my driveway is concrete but if I must..........
So, how does this work? Presumably the metal cable is acting as the earth? Is this somehow then connected to the consumer unit to connect the earth circuit? Should I remove the whole lot and start again? I would like to be able to remove the cable from the conduit and run a new 3 core through it, but with the conduit being metal presumably that's not acceptable? I would like to avoid having to lay more conduit as my driveway is concrete but if I must..........