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Running cable through last joist to drop down joist-parallel brick wall

Discussion in 'Electrics UK' started by Donkmeister, 7 Apr 2019.

  1. Donkmeister

    Donkmeister

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    Every article I've read, and my onsite guide, shows methods to get through floor joists in the middle of a room. However, I can't find what best practice is when running a cable through the last floor joist before reaching the brick wall, where the gap between the two is only an inch or so.

    Do you drill a hole as normal, then bend the end of the cable a pit so that when you push the cable through it bends round to reach the drop?

    Or is there some other approach?

    Or do you use the safe zone at the top of the wall?

    Or do you just never run sockets on joist-parallel walls?

    Thanks all!
     
  2. crystal ball

    crystal ball

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    Creative drilling and a bit of chiselling and yes bend the cable
     
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  3. securespark

    securespark

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    I always had lengths of old solid core bonding cable (uninsulated) which was easy to bend.
    I would thread it through the hole from the side next to the wall then tie the cable on and drag it back.

    A pair of pin-nosed pliers come in handy. Oh, and a pair of gloves too, otherwise scraped knuckles would be a very likely outcome...
     
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  4. crystal ball

    crystal ball

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    A wire coat hanger is a useful tool also
     
  5. Donkmeister

    Donkmeister

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    Thanks both, I'll try using a bit of 6mm or 10mm to draw it through.
     
  6. EFLImpudence

    EFLImpudence

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    Not sure if you meant it literally but you shouldn't run cables "in the middle of the room".
    https://www.diynot.com/wiki/Electrics:route

    Also in OSG, I presume.
     
  7. EFLImpudence

    EFLImpudence

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    Chisel a notch across the top of the edge joist and cover with a steel plate - as in the link for the copper pipe.
     
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  9. crystal ball

    crystal ball

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    Not sure what you mean?
     
  10. EFLImpudence

    EFLImpudence

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    upload_2019-4-8_14-46-14.png

    So at 0.5 of the span - i.e. the middle of the room - is not permitted.
     
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  11. conny

    conny

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    Depending on the depth of the joist you may be able to drill at a downward angle. i.e. if your joist is 6" deep drill down 2" from the top to within 2" of the bottom. This will give you a lead without having a sharp bend in the cable.
     
  12. Donkmeister

    Donkmeister

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    Ah, I mentioned running through joists in the middle of the room, not through the centres of joists.
    I'll be sure to define 3-d axes relative to defined datum points in future to avoid ambiguity ;):p
     
  13. EFLImpudence

    EFLImpudence

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    How can the middle of the room not be 0.5 of the span?

    The 'centre' of the joist is generally taken to mean half the depth.
     
  14. SimonH2

    SimonH2

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    Colloquially "middle of the room" could be "anywhere but round the outside" - so in this context, anything but the joists close to the walls.
    While the advice above is all sound, there is one thing not mentioned ... That the ****ing ****er ****ard builders often stick the end joists so close to the wall that you can't even see past the skirting. So you end up having to use a fishing rod* at a shallow angle (ie not far off horizontal) to even get it into the gap, and fish blind for the thin pull wire you've pushed through the hole.

    * Aka, cable rods
     
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