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electrical diy help,dimmer lights

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ast83
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2009/08/03 13:55:57 (permalink)
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electrical diy help,dimmer lights

hi hoping someone will know how to help , i have a double dimmer switch in my lounge ,that ie 2 knobs that controls 2 pendent lights on my ceiling ,i replaced my lights with new lights ,now the first light i took off had 3 wires that i simply connected up and switched on hey presto it works . now the second light had 2 bunches of wires a red/black ,and bare copper  and again a red /black and a bare copper ,now i didnt look how these were looped in ,does any body know how or what wire s loop together ? im assuming 3 wires come from the switch or the other light ?
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    yungdest81
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    Re:electrical diy help,dimmer lights 2009/08/03 14:10:57 (permalink)
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    One lot will be coming from the first light, the other lot from the switch...

    What colours you got at the switch ?

    You should also have a blue there ? (neutral)

    I'm assuming the bare conductor is the earth ? dangerous !
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    yungdest81
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    Re:electrical diy help,dimmer lights 2009/08/03 14:16:15 (permalink)
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    Sorry mis read, red and black are 2 seperates ?

    so the black is your neutral...

    lemme think on this a sec :)
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    yungdest81
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    Re:electrical diy help,dimmer lights 2009/08/03 14:25:09 (permalink)
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    Ok, assuming its been wired correctly at the switch...

    bare conductor should be the cpc (earth) there will be a seperate connection for the earth, on its own at the light, connect the 2 bare conductors together.

    The 2 reds should be the permanent lives, connect these together, in the middle connection thing at the light, ie not on either side of the connector block.

    The black coming over from the first light, connect to the blue at the light (should be blue) these are your neutrals.

    Then the black coming back from the light should be a neutral being used as a live feed from the light, connect this to the brown on the light (should be brown)

    Hope this is simple enough for you....im assuming with new lights, that there are blue and brown cables connecting to the bulb.

    This is on the basis that the switches are wired correctly. ie red at the top, black at the bottom, cpc will again be wired kinda on its own !
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    ast83
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    Re:electrical diy help,dimmer lights 2009/08/03 14:42:48 (permalink)
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    okthe switch is as described with red and black wires ,and the earths are twisted togeher,now the light has only 3 spaces for wires one brown one blue, and a screw for the earth ,im confused at where i put the two red wires as both spaces will be taken by the brown and blue
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    yungdest81
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    Re:electrical diy help,dimmer lights 2009/08/03 14:59:27 (permalink)
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    Connect the 2 reds together via a connection block.

    This is the permanent live coming from your consumer unit, so this needs to go to the switch where you interupt the circuit.

    To explain what it does, imagine you connected that red to the brown at the light, this would mean light would alwasy stay on, as that live isnt being interupted by a switch. you could twist them together at the 'bare' ends, but this can be very dangerous and not something i would do, it would work however.
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    yungdest81
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    Re:electrical diy help,dimmer lights 2009/08/03 15:01:17 (permalink)
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    The earths are connected to the switch plate though right ?

    you say twisted together...

    Sorry if you know and this sounds patronising, but you realise the earth will take a fault current to 'earth'. If those earths are not correctly terminated, the fault current will stay a fault current and not trip the fuses.
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    ast83
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    Re:electrical diy help,dimmer lights 2009/08/03 16:01:01 (permalink)
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    the earths are ok ,and i have got the light to turn on but wont turn off,so im going to try and reconize what wire comes from what ,which wont be easy as cant lift floor boards upstairs to have a good look .
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    yungdest81
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    Re:electrical diy help,dimmer lights 2009/08/03 16:27:50 (permalink)
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    That means the permanent live is connected to the brown at the light, must be wired incorrectly somewhere...

    whatever colour you have going into the light bulb, change over, so if you had the 2 reds together, take the red going to the switch, and connect to the brown at bulb, and take the one that was at the brown at the bulb, and connect to the other red...

    All this as i say is assuming you wired the first light correctly, and that the switch is wired the correct way around.
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    yungdest81
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    Re:electrical diy help,dimmer lights 2009/08/03 16:41:43 (permalink)
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    Then the black coming back from the light should be a neutral being used as a live feed from the light, connect this to the brown on the light (should be brown)

    should read...

    Then the black coming back from the switch should be a neutral being used as a live feed from the switch, connect this to the brown on the light (should be brown)

    sorry mate, that could of confused the f*ck out of you !
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    ast83
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    Re:electrical diy help,dimmer lights 2009/08/03 19:07:41 (permalink)
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    yungdest81 JOB DONE completed i now have 2 dimmable lights all working correctly many thanks for your help......much appreciated.
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    yungdest81
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    Re:electrical diy help,dimmer lights 2009/08/04 09:53:46 (permalink)
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    Excellent, nice one, sorry if i confused you before, i was wondering why it didnt work, then read back over what i'd posted ! woops !

    Well pleased 4 ya ! :)
    #12
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