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WIRING DIAGRAMS FOR LIGHTING CIRCUITS.

Discussion in 'Electrics UK' started by FAQ, 5 May 2010.

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  1. FAQ

    FAQ

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    PLEASE NOTE (Thanks to SecureSpark)

    Before changing a light fitting or switch (or any other accessory for that matter), please do what you can to document the existing connections to that equipment. Take photo's and write down which wires are connected to which terminals on the accessory or light fitting.

    Especially, do NOT assume black-sheathed conductors are neutrals!

    A classic DIY mistake is to take down a correctly connected light fitting with more than one cable connected to it then wire up the new one with all reds to the live terminal and all blacks to the neutral (Not forgetting the earth terminal to the cpc's, where present).

    When the circuit is re-energised, it is discovered that the light is on with the switch(es) in the "OFF" position(s). When the (one) switch is switched to the other position, the circuit protective device opens, as there is now a short circuit between live and neutral.

    Additionally, there may well be three core cables connected to extractor fans etc...Do not assume certain colours must be lives and others neutrals.

    Also, this sounds a little obvious, but if the wiring is not faulty and the accessory or light fitting is working, please ensure it is reconnected in the same manner as before.


    1) SINGLE WAY LIGHT VIA A JUNCTION BOX
    [​IMG]
    Click image to enlarge
    NOTE-
    If a metal light switch is used, connect the earth wire to the earth terminal on the light switch and loop to the back box.

    Using a switch wire with twin red + earth:
    [​IMG]
    (Click on image to open)

    Harmonized (Brown / Blue):
    [​IMG]
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    Harmonized with twin brown + earth switch wire:
    [​IMG]
    (Click on image to open)
     
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  2. FAQ

    FAQ

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    2) LIGHTING USING CHOCK BLOCK OLD COLOURS

    1 way lighting using chock block:
    [​IMG]
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    2 way lighting using chock block:
    [​IMG]
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    2 way intermediate using chock block:
    [​IMG]
    Click image to enlarge
     
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  3. FAQ

    FAQ

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    3) 2 way switching.

    Converting from 2 independently switched lights

    [​IMG]

    OLD STYLE 2 WAY SWITCHING

    This method should only be used if the lights are on the same circuit but it's not that uncommon to see it done between circuits!

    [​IMG]
     
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  4. FAQ

    FAQ

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    4) ADDING A THIRD SWITCH TO A 2 WAY SYSTEM.

    You don't need to understand the workings of the existing 2 way system, you just have to remember that the combination of a 2 way switch and an intermediate switch act like a 2 way switch that can be controlled from 2 places.

    Follow this diagram

    [​IMG]
     
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  5. FAQ

    FAQ

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    5) 1-WAY & 2-WAY SWITCHES

    [​IMG]
    Click image to enlarge


    Never bother buying 1-way switches - 2-ways will do the same job, and can be upgraded if you need to in the future.

    2 GANG 2 WAY SWITCH

    This is the back of a 2 gang 2 way switch.

    It is 2 switches on the back of the same switch plate, one being up side down in relation to the other. Each switch must use C and L1 or all 3. The dividing line shows which is which half.
     
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  6. FAQ

    FAQ

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    6) MORE SWITCHING METHODS

    NOTE :Don't be confused if a different colour goes to a different terminal. Often Red is used as "Common" & Blue & Yellow as strappers (L1 & L2).

    [​IMG]
    Click image to enlarge

    [​IMG]
    Click image to enlarge
     
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  7. FAQ

    FAQ

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    7) WIRING DIAGRAMS

    Here are some colour variations on the choc block connection method.

    [​IMG]
    Click image to enlarge

    [​IMG]
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    This is a multi switch setup. You can fit as many intermediate switches as you like.

    [​IMG]
    Click image to enlarge
     
  8. FAQ

    FAQ

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    8 ) LIGHTING USING A JUNCTION BOX HARMONIZED COLOURS

    1 way lighting using junction box:
    [​IMG]
    Click image to enlarge

    2 way lighting using junction box
    [​IMG]
    Click image to enlarge

    2 way intermediate using junction box:
    [​IMG]
    Click image to enlarge
     
  9. FAQ

    FAQ

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    9 ) HOW TO SPUR OFF A SOCKETS RING CIRCUIT

    [​IMG]
    Click image to enlarge

    Thanks To RF Lighting
     
  10. FAQ

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    10) CEILING ROSE HARMONIZED WIRING

    If a metal light switch is used, connect the earth wire to the earth terminal on the light switch and loop to the back box.

    It is possible to place more than one intermediate switch on the cable between both of the two way switches making more switch points. All the intermediate switches are wired in the same configuration.

    Chock block must be enclosed in fitting or in a suitable enclosure above ceiling and not exposed to heat from the lamp.

    Harmonized Colour Scheme Diagrams

    Single way loop in ceiling rose:
    [​IMG]
    Click image to enlarge

    Two way with loop in ceiling rose:
    [​IMG]
    Click image to enlarge

    Two way intermediate with loop in ceiling rose:
    [​IMG]
    Click image to enlarge
     
  11. FAQ

    FAQ

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    11) LIGHTING USING CHOCK BLOCK HARMONIZED

    Single way lighting using chock block, courtesy of RF Lighting:
    [​IMG]
    Click image to enlarge

    Two way lighting using chock block:
    [​IMG]
    Click image to enlarge

    Two way intermediate using chock block:
    [​IMG]
    Click image to enlarge
     
  12. FAQ

    FAQ

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    How to add a P.I.R. with floodlight.

    Connecting to the ring main (socket circuit)

    Cables used from the JB to the F.C.U must be the same size as the existing cable (2.5mm) You must then put a 3A fuse in the F.C.U.

    Connecting to a lighting circuit, the F.C.U can be a switch instead


    above uses all old colours


    above uses old and new colours
     
  13. securespark

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  14. bernardgreen

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    An alternative way to wire a two way light circuit which is convenient for wall lamps with a switch in or below the lamp.


     
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