Hello,
I am just about to replace a 2 fused CUs with a single split-load MCB CU in order to make capacity for a new Cooker circuit.
House is mid 1960s with PVC insulation, steel (I think) conductors (multistrand earth). The cable seems fine and the insulation is intact wherever I have seen it, so I am thinking it doesn't need to be replaced. All I am planing on doing is sheathing the bare earth conductors. Does anyone disagree?
However, I have found 1 section in the ring main which appears to have black/red rubber insulation inside grey PVC sheath. Again, conductors appear to be steel. Did that exist? I thought rubber insulated cable tended to have rubber black sheath too. The 'rubber' insulation isn't degraded. It is still soft and flexible which makes me think that it isn't actually rubber, but it certainly feels rubbery and looks very different to the PVC elsewhere.
Does anyone have any ideas as to what this section of cable is? Does it need replacing? It is in a room I have already decorated, so I would rather not if there is not a good reason.
Thanks
Mark