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Wiring 2 pin to 3 pin- identical wires

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  • 18-03-2015 11:38am
    #1
    bstens
    Registered Users Posts: 18 ✭


    I bought a new lamp which had a 2 pin plug on it, after snipping the 2 pin off i realised that both wires are identical so I am unsure which is live and which is neutral. Is there a way to find out which is which so I can re plug the device without frying it?
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    #2
    tphase
    Registered Users Posts: 1,123 ✭✭✭tphase


    there's no earth so it doesn't matter


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    #3
    newmug
    Banned (with Prison Access) Posts: 3,571 ✭✭✭newmug


    It doesn't make any difference. Its safe to wire them up either way.


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    #4
    bstens
    Registered Users Posts: 18 ✭bstens


    tphase wrote: »
    there's no earth so it doesn't matter

    So either wire can be the live and the neutral and I can connect either one up to the live pin?


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    #5
    DublinDilbert
    Registered Users Posts: 5,379 ✭✭✭DublinDilbert


    Your not going to fry the device as such by getting the wires backwards.

    As others have said the wires can go either way. The only thing you need to watch out for is if there a switch on the lamp. If there's a switch on the lamp, best practice would be to have that switch on the "live" wire. If there is a switch and the wires aren't coloured/marked, you'll need some form of continuity tester to figure out which is the "live" wire at the plug.


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    #6
    bstens
    Registered Users Posts: 18 ✭bstens


    The wires feed into a box with a switch on it and then continue on into the lamp stand. Its a screw fitting bulb too if that makes a difference!


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    #7
    xabi
    Registered Users Posts: 2,998 ✭✭✭xabi


    Work out which wire goes through the switch and use that as 'live'


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    #8
    bstens
    Registered Users Posts: 18 ✭bstens


    xabi wrote: »
    Work out which wire goes through the switch and use that as 'live'

    good idea, i will try that one


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    #9
    Risteard81
    Registered Users Posts: 2,567 ✭✭✭Risteard81


    bstens wrote: »
    The wires feed into a box with a switch on it and then continue on into the lamp stand. Its a screw fitting bulb too if that makes a difference!

    Polarity does matter with the older non-EN marked Edison Screw lamps (without insulated threads) as the phase conductor should only be connected into the centre pin.


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    #10
    bstens
    Registered Users Posts: 18 ✭bstens


    Risteard81 wrote: »
    Polarity does matter with the older non-EN marked Edison Screw lamps (without insulated threads) as the phase conductor should only be connected into the centre pin.

    its a brand new light bought through a reputable furniture store here so hopefully this will not be a po


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    #11
    Risteard81
    Registered Users Posts: 2,567 ✭✭✭Risteard81


    bstens wrote: »
    its a brand new light bought through a reputable furniture store here so hopefully this will not be a po

    Does the information tell you what Standard the lampholder is manufactured to?


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    #12
    bstens
    Registered Users Posts: 18 ✭bstens


    I had a further look at the lamp (I have not used it yet!). the switch is a dimmer, on the back of the dimmer it says this.
    Does this all mean that it doesnt matter which way its wired since its definitely AC


    Model: KFD-325G series
    220-240v ~
    50Hz/60hz
    40-150w~/

    T1AH/250v AC

    50x20m/m

    found this link to the dimmer prouct on this website
    kaoyi.com/oneproducts.aspx?ProductsCateID=757&CateID=757&CurrCateID=304


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    #13
    Bagenal
    Registered Users Posts: 179 ✭✭Bagenal


    As Risteard said I would prefer that the live be to the centre pin of the bulb holder, you would need a continuity tester to check this.


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