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Bent wire core into socket

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  • 28-03-2017 11:29am
    #1
    stiofan85
    Registered Users Posts: 505 ✭✭✭


    Hi folks,

    Recently had some rooms skim coated and was putting back on sockets and some of the cores from the wires are bent back on themselves where they are conected to the socket and some are not.

    Is there a correct/official way for this or is it just a case that the electrician left too much exposed and doubled the core back on itself?

    Thanks


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    #2
    antiskeptic
    Registered Users Posts: 9,555 ✭✭✭antiskeptic


    stiofan85 wrote: »
    Hi folks,

    Recently had some rooms skim coated and was putting back on sockets and some of the cores from the wires are bent back on themselves where they are conected to the socket and some are not.

    Is there a correct/official way for this or is it just a case that the electrician left too much exposed and doubled the core back on itself?

    Thanks

    It would be driven by the size of the hole the wire is going into. If it's a relatively large hole (say the terminals of a socket which is sized to accept 2 wires (forming a daisy-chained radial circuit) then an unfolded single wire won't be adequately clamped by the screw when tightened. It'll shift to the side of the hole as the screw is tightened down and the screw will only half-catch it.

    By folding back the wire on itself you effectively double up the wire and give a greater surface area for the screw to clamp squarely down onto. Good practice thus.

    It would be quicker to snip a too-long wire than fold it back on itself so that's not the reason.


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    #3
    Steve
    Moderators, Category Moderators, Entertainment Moderators, Sports Moderators Posts: 22,584 CMod ✭✭✭✭Steve


    It also provides a greater area of surface contact between the conductor and the terminal, this reduces electrical resistance and reduces the risk of heating under load.


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    #4
    stiofan85
    Registered Users Posts: 505 ✭✭✭stiofan85


    Thanks for the update folks. Makes sense.

    All the sockets are working - is it worth going back through them to check which ones were not doubled back where there was only one wire and do it?


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    #5
    2011
    Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,595 Mod ✭✭✭✭2011


    It is important that the connections are tight, the conductor is undamages, the insulation is continued as far as possible.


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    #6
    stiofan85
    Registered Users Posts: 505 ✭✭✭stiofan85


    2011 wrote: »
    It is important that the connections are tight, the conductor is undamages, the insulation is continued as far as possible.

    So the answer is yes. Cheers


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    #7
    stiofan85
    Registered Users Posts: 505 ✭✭✭stiofan85


    While I'm asking, the connection for the induction hob (7200w) has crimps at the end. There are two of each wire and crimped together. I take it these crimps are not supposed to be removed? Would make connecting in the terminal box quite tough as the 10sqmm takes up a lot of space.

    In the attached image the black wire is the hob. It has a brown & black crimped together for Live and two blue (one darker than the other) crimped, with a separate earth.


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