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

FearTheBassPlayer Avatar
7y, 10m agoPosted 7 years, 10 months ago
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
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FearTheBassPlayer Avatar
7y, 10m agoPosted 7 years, 10 months ago
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1 Like #1
Put 1 In The Com And 1 In The L1
#3
http://www.hgsc.bcm.tmc.edu/downloads/graphics/Bang.jpgONLY KIDDING COULDENT RESIST,MY WIRING INFO IS GOOD
1 Like #4
raptorcigs
Put 1 In The Com And 1 In The L1


What raptor said:thumbsup:
#5
raptorcigs
Put 1 In The Com And 1 In The L1


^^^What he said.
#6
raptorcigs
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!!!!!
#7
bassman_uk
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".
#8
http://www.handymanknowhow.co.uk/electrics/testinglive209.jpg
2 Likes #9
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
#10
octobergirl
Put the red in C and put the black in C1 or C2 does not make a difference because it is two way
you 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?
#11
choc1969
http://www.handymanknowhow.co.uk/electrics/testinglive209.jpg


octobergirl
Put the red in C and put the black in C1 or C2 does not make a difference because it is two way
you 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:
#12
thesaint
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
#13
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:
#14
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
1 Like #15
octobergirl;3474327
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


Exactly :thumbsup:
banned 1 Like #16
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?
#17
sassie
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;-)
1 Like #18
sassie
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.
#19
cheers everyone. Rep will be given out too :)

I will give it a shot tomorrow (in the light!)
#20
sassie;3474356
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#21
Shengis
No.


there ya go op, a simple answer :thumbsup:
#22
sassie
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?
#23
thesaint
How many people need to tell him what to do?


For someone scared about the consequences of Electricity, simplicity was the key :thumbsup:
banned#24
thesaint
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
#25
bassman_uk
For someone scared about the consequences of Electricity, simplicity was the key :thumbsup:


raptorcigs
Put 1 In The Com And 1 In The L1


fox2020
What raptor said:thumbsup:


thesaint
^^^What he said.


thesaint
Simple instruction, put 1 in "Com" and 1 in "L1".
#26
sassie
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#27
bassman_uk
For someone scared about the consequences of Electricity, simplicity was the key :thumbsup:


hope your now sorted ;-)
#28
sassie
hope your now sorted ;-)


I shall try in the morning when i don't have to work from Torchlight :)
#29
How many HUKDers does it take to change a lightswitch?





Just one, the rest just give them instructions from a safe distance:whistling:
#30
harlzter
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
#31
bassman_uk
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:
#32
Should the new question be 'How many people will it take to switch on a lightbulb?' :roll:
#33
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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