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Sub Main in Notched Joists. Your Opinion Please.

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Here we have a 16.00mmm2 T&E cable installed many years ago in a house, and it supplies a recently renewed consumer unit in an annexe. The cable runs under the first floor boards in notched  wooden joists. The boards are about 15mm thick. There is no mechanical protection apart from the wooden boards. The cable runs centrally to the floor boards  in the notched joists.


What is your opinion about leaving the cable where it is? It is backed up by a 60 Amp fuse in a switch fuse. There is no R.C.D. protection for the sub-main cable.


Z.


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    Chris Pearson:

    As you know, it falls foul of 522.6.201.


    I agree with Andy, were you doing an EICR, it would be C3.


    On the whole, I think better for the structural integrity of the house to leave it where it is; but if you are feeling energetic, you could drill some holes (1/2"?) through all the joists and re-site it.


    If some prat puts a nail through it, so be it.


    I am not inclined to reduce the strength of the  wooden joist any more Chris by drilling. The cable is large, about the width of a man's thumb.


    Z.


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  • 0
    Chris Pearson:

    As you know, it falls foul of 522.6.201.


    I agree with Andy, were you doing an EICR, it would be C3.


    On the whole, I think better for the structural integrity of the house to leave it where it is; but if you are feeling energetic, you could drill some holes (1/2"?) through all the joists and re-site it.


    If some prat puts a nail through it, so be it.


    I am not inclined to reduce the strength of the  wooden joist any more Chris by drilling. The cable is large, about the width of a man's thumb.


    Z.


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