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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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    Zoomup:

    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.


    As I am sure you know, the French translation of "an inch" is "un pouce", which is also their word for a thumb. But that is length, not breadth. I have just measured my own thumb with my super-accurate Mitutoyo callipers and it is exactly, if not precisely, 1/2" wide.


    I actually would not worry about drilling 1/2" holes, but it is hard work and gives me blisters. I agree - stick with what you have. ?


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  • 0
    Zoomup:

    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.


    As I am sure you know, the French translation of "an inch" is "un pouce", which is also their word for a thumb. But that is length, not breadth. I have just measured my own thumb with my super-accurate Mitutoyo callipers and it is exactly, if not precisely, 1/2" wide.


    I actually would not worry about drilling 1/2" holes, but it is hard work and gives me blisters. I agree - stick with what you have. ?


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