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Insulated tails used to supply flats

Former Community Member
Former Community Member
We have a block of flats completed in 2017 that have supplies to individual flats in insulated twin and earth.

These cables are fed from a switch fuse and then into a ceiling disappearing into the building fabric.

I no longer carry electrical regs books (Approved sparks but fire specialist) but I did flag up the poor way these cables were installed and questioned if they required a RCD as they were not in metal conduit of armoured cables as I normally see.

Was it not a requirement in a 2015 amendment that all cables such as this were protected/RCD?

Many thanks for taking the time to read.

Paul.
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    It may just about be OK, if the cables are on view, or so deeply buried as to be not likely to be disturbed, 50mm deep or more from the surface is normally considered OK.

    Another issue to ponder is that T and E normally has a reduced earth core compared to L and N, and may not be enough cross section to serve as the main earth in the flat, depending  if things like water pipes main bonding is at the flat end or done centrally at the building incomer.

    Steel wire armoured cable or in earthed metal trunking of some kind would be much preferred. An RCD at the origin is not very convenient if the flat and the RCD are separated by any distance even less so if the RCD is in a locked meter cupboard.
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  • 0
    It may just about be OK, if the cables are on view, or so deeply buried as to be not likely to be disturbed, 50mm deep or more from the surface is normally considered OK.

    Another issue to ponder is that T and E normally has a reduced earth core compared to L and N, and may not be enough cross section to serve as the main earth in the flat, depending  if things like water pipes main bonding is at the flat end or done centrally at the building incomer.

    Steel wire armoured cable or in earthed metal trunking of some kind would be much preferred. An RCD at the origin is not very convenient if the flat and the RCD are separated by any distance even less so if the RCD is in a locked meter cupboard.
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