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wiring lighting form socket using 5amp fused spur. Dimmer Sw

Discussion in 'Electrics UK' started by gunnerspg, 25 Jan 2011.

  1. gunnerspg

    gunnerspg

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    I have wired a new dimmer switch that is feeding two wall lights.
    I have spured off a normal socket which is then wired into a 5amp fused spur and then onto the dimmer and then onto the wall lights. I think i have done everything correctly apart from the wiring into the back of the dimmer switch. Can someone help me with how i wire both the feed form the fused spur and the wire leading to the wall lights in.
    Thanks
     
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  3. sparkwright

    sparkwright

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    You connect the earths together in the earth terminal on the back box, if the dimmer switch is metal you MUST earth that too.

    You join the neutral wires together in a piece of connector block.

    If your dimmer is new it should come with a wiring diagram; it may even be printed on the back of the dimmer. The feed wire goes in one terminal, the light wire goes in another terminal.

    Is your dimmer one way or two way?
    What markings are on the terminals?
     
  4. riveralt

    riveralt

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    And I take it that it is not working.
    Is this already a spur from the ring final circuit (RFC) or is it part of the RFC? In other words how many cables are in the socket you have wired it from?
    So it doesn't work then?
    Assuming that the RFC socket is not a spur then connect the line, neutral and earth at the socket run it up to the FCU's line neutral and earth and then onto the dimmer.
    At the dimmer you want to put the line into the Common terminal, the neutral into a terminal block and the earth into the back of the box - if it is a metal dimmer you will also need an earth fly lead to the back of the box.
    You then need to connect the switch live to the wall lights to the L1 terminal and the wall lights return neutral in the neutral terminal block - make sure the earths are also matched.
    What type of wall lights have you?
    If it is the bayonet type then there is less of an issue identifying the switch live - if it is the edison screw in type then you need to identify which is the switch live and which is the neutral.
    Finally if the new cable is not buried more than 50mm below the surface or mechanically protected and earthed you will need to ensure that the circuit is protected by an RCD.
     
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  5. Steve

    Steve

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    I bet firstly, he needs a new dimmer :LOL:
     
  6. gunnerspg

    gunnerspg

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    The markings are common, L1 and L2. The dimmer is brand new and i have got the lights working but not the switch live as i can only turn it off by the fused spur.
     
  7. Steve

    Steve

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    Did you, at any point, connect the neutral to the dimmer? If so, your next journey should be to buy a new dimmer.

    You need to connect switched live and live to the dimmer. ONLY. Neutral bypasses the switch.
     
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  9. gunnerspg

    gunnerspg

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    sorry the dimmer is just one way.
     
  10. gunnerspg

    gunnerspg

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    i think ive got it. So i connect the two neutrals together in a connector block then the live that comes from the fused spur to the common terminal and the live that comes from the wire that leads to the lights in the L1 terminal. Also its RCD protected.
     
  11. riveralt

    riveralt

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    Yes that is correct - don't forget the earths. ;)
     
  12. gunnerspg

    gunnerspg

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    Just one more thing, if it is a spur from the ring main can i not use this socket to spur the lighting from? thanks
     
  13. riveralt

    riveralt

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    You cannot spur from a spur with a ring final circuit.
     
  14. gunnerspg

    gunnerspg

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    Ok thanks that has really helped me out of an awkward situation.
     
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