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    Changing a light switch - what if I re wire it wrong?

    I've got a faulty dimmer switch which needs replacing, and I'm replacing it with a standard switch.
    All went fine until I took the switch off!!
    There are 2 red wires, and there should be 1 red and 1 black.
    There are no markings on the back of the dimmer switch, and on the back of the new switch I've got 3 points -COM , L1 and L2.
    Logic would say that the 2 wires should go in COM and L1 or L2, but the problem is both wires are the same colour, and there aren't any COM or L markings on the back of the old switch.
    I'm worried about wiring it wrong and messing up the electrics in he house. This is such a simple job, but made harder by the fact I don't know what wire is what.
    Any sparkies out there? Can you tell me if I wire it up wrong, will it blow the electrics up, or me up, or just simply not work?

    Cheers in advance

    33 Comments

    Put 1 In The Com And 1 In The L1

    http://www.hgsc.bcm.tmc.edu/downloads/graphics/Bang.jpgONLY KIDDING COULDENT RESIST,MY WIRING INFO IS GOOD

    raptorcigs;3474203

    Put 1 In The Com And 1 In The L1



    What raptor said:thumbsup:

    raptorcigs;3474203

    Put 1 In The Com And 1 In The L1



    ^^^What he said.

    Original Poster

    raptorcigs;3474203

    Put 1 In The Com And 1 In The L1



    Does it matter which wire? Thats what I'm holding back on in case I haven't got them right, because of me not knowing which is which.

    Damn 2 red wires!!!!!

    bassman_uk;3474225

    Does it matter which wire? Thats what I'm holding back on in case I … Does it matter which wire? Thats what I'm holding back on in case I haven't got them right, because of me not knowing which is which.



    Simple instruction, put 1 in "Com" and 1 in "L1".

    http://www.handymanknowhow.co.uk/electrics/testinglive209.jpg

    Put the red in C and put the black in L1 or L2 does not make a difference because it is two way
    you can use L1 or LC2 for the black as L1 and L2 are really just for one or two way ue and an ordinary switch is one way do does not matter which you put it in

    octobergirl;3474280

    Put the red in C and put the black in C1 or C2 does not make a difference … Put the red in C and put the black in C1 or C2 does not make a difference because it is two wayyou can use C1 or C2 for the black as C1 and C2 are really just for one or two way ue and an ordinary switch is one way do does not matter which you put it in



    Have you read the opening post?

    Original Poster

    choc1969;3474275



    octobergirl;3474280

    Put the red in C and put the black in C1 or C2 does not make a difference … Put the red in C and put the black in C1 or C2 does not make a difference because it is two wayyou can use C1 or C2 for the black as C1 and C2 are really just for one or two way ue and an ordinary switch is one way do does not matter which you put it in



    problem is I have 2 red wires, and no multimeter:w00t:

    Original Poster

    thesaint;3474233

    Simple instruction, put 1 in "Com" and 1 in "L1".



    So can you tell me the difference between the 2 red wires? They surely can't do the same thing

    bassman_uk;3474299

    problem is I have 2 red wires, and no multimeter:w00t:



    doesn't matter.......one red in Com, one in L1 :thumbsup:

    everyone should have a multimeter in their toolbox.....tut tut :whistling:

    two red wires
    1 is a live all of the time
    the other is the switch wire to the light
    so
    commn is the live all the time one
    L1 or L2 (no difference) is your switch wire to the light
    you are supposed to have two red ones as they are both live conductors
    because one is live continuously and one is only live when you switch the light on

    octobergirl;3474327

    two red wires1 is a live all of the timethe other is the switch wire to … two red wires1 is a live all of the timethe other is the switch wire to the lightsocommn is the live all the time oneL1 or L2 (no difference) is your switch wire to the lightyou are supposed to have two red ones as they are both live conductorsbecause one is live continuously and one is only live when you switch the light on



    Exactly :thumbsup:

    Banned

    for gawds sake people, he has two red wires, does it matter which red wire goes into which hole, that is what he is asking?

    sassie;3474356

    for gawds sake people, he has two red wires, does it matter which red … for gawds sake people, he has two red wires, does it matter which red wire goes into which hole, that is what he is asking?



    Don't worry sassie it's sorted;-)

    sassie;3474356

    for gawds sake people, he has two red wires, does it matter which red … for gawds sake people, he has two red wires, does it matter which red wire goes into which hole, that is what he is asking?



    No.

    Original Poster

    cheers everyone. Rep will be given out too

    I will give it a shot tomorrow (in the light!)

    sassie;3474356

    for gawds sake people, he has two red wires, does it matter which red … for gawds sake people, he has two red wires, does it matter which red wire goes into which hole, that is what he is asking?



    sass. we have told him that, even game him a pic :whistling:

    Banned

    Shengis;3474372

    No.



    there ya go op, a simple answer :thumbsup:

    sassie;3474356

    for gawds sake people, he has two red wires, does it matter which red … for gawds sake people, he has two red wires, does it matter which red wire goes into which hole, that is what he is asking?



    How many people need to tell him what to do?

    Original Poster

    thesaint;3474384

    How many people need to tell him what to do?



    For someone scared about the consequences of Electricity, simplicity was the key :thumbsup:

    Banned

    thesaint;3474384

    How many people need to tell him what to do?



    then i must be as stupid as the op because i couldnt see his question answered, he was asking did it make a difference which red went inot which hole, adn just kept being told to put one into one hole ad the other into other hole, not whether it mattered which one, at a guess i would say 1st time changinf a light switch and was nervous

    bassman_uk;3474399

    For someone scared about the consequences of Electricity, simplicity was … For someone scared about the consequences of Electricity, simplicity was the key :thumbsup:



    raptorcigs;3474203

    Put 1 In The Com And 1 In The L1



    fox2020;3474220

    What raptor said:thumbsup:



    thesaint;3474222

    ^^^What he said.



    thesaint;3474233

    Simple instruction, put 1 in "Com" and 1 in "L1".

    Original Poster

    sassie;3474410

    then i must be as stupid as the op because i couldnt see his question … then i must be as stupid as the op because i couldnt see his question answered, he was asking did it make a difference which red went inot which hole, adn just kept being told to put one into one hole ad the other into other hole, not whether it mattered which one, at a guess i would say 1st time changinf a light switch and was nervous



    Is first time, and not about to want my life expired!

    we have to learn how to do things, and if anyone else asks, I can tell them the right answer too.

    Don't like the reference to being stupid though :x

    Banned

    bassman_uk;3474399

    For someone scared about the consequences of Electricity, simplicity was … For someone scared about the consequences of Electricity, simplicity was the key :thumbsup:



    hope your now sorted ;-)

    Original Poster

    sassie;3474427

    hope your now sorted ;-)



    I shall try in the morning when i don't have to work from Torchlight

    How many HUKDers does it take to change a lightswitch?





    Just one, the rest just give them instructions from a safe distance:whistling:

    harlzter;3474524

    How many HUKDers does it take to change a lightswitch?Just one, the rest … How many HUKDers does it take to change a lightswitch?Just one, the rest just give them instructions from a safe distance:whistling:



    http://img527.imageshack.us/img527/2235/electriclr6.gif

    bassman_uk;3474424

    Is first time, and not about to want my life expired!we have to learn how … Is first time, and not about to want my life expired!we have to learn how to do things, and if anyone else asks, I can tell them the right answer too.Don't like the reference to being stupid though :x



    Some people do find it makes them feel better to belittle others on this forum, not too sure why, however you'll find most posters helpful:thumbsup:

    Should the new question be 'How many people will it take to switch on a lightbulb?' :roll:

    The above has been very helpful, thank you.
    Now what would you do if you have a double switch with four red wires and another tiny red wire bridging diagnallly across?
    Please help

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