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Sub Main in Notched Joists. Your Opinion Please.

Zoomup
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:
    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. ?




    Chris, the cable is 16mm2 T&E and a lot wider than 1/2 inch. My thumbs are nearer an inch wide. The floor boards are up for other work not an E.I.C.R. production. To renew the cable will be a lot of work. I think that I will leave it alone, but the B.E.S.A. box covers are a good idea.  I will mark the floor boards in black marker pen to advise of cables below. The owner is a developer and pretty familiar with building work. He lifted the boards so knows the situation. P.S. I would not like to pull 16mm2 T&E cable through holes in wooden joists anyway. Too difficult.


    Z.


     


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  • 0
    Chris Pearson:
    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. ?




    Chris, the cable is 16mm2 T&E and a lot wider than 1/2 inch. My thumbs are nearer an inch wide. The floor boards are up for other work not an E.I.C.R. production. To renew the cable will be a lot of work. I think that I will leave it alone, but the B.E.S.A. box covers are a good idea.  I will mark the floor boards in black marker pen to advise of cables below. The owner is a developer and pretty familiar with building work. He lifted the boards so knows the situation. P.S. I would not like to pull 16mm2 T&E cable through holes in wooden joists anyway. Too difficult.


    Z.


     


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