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Troubleshooting UK Kitchen Lamp Connection Issues: Wiring, Switches & Protection Activation

bocian1821 7773 17
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How do I wire a new kitchen lamp to a UK ceiling switch when the lamp either stays on all the time or trips the protection?

Wire the lamp to the switched live from the double switch: connect the lamp’s brown to the red wire from the two-core cable, join the two blue wires together with the lamp’s blue, and join all earths (yellow-green) together and to the lamp’s centre/metal body [#18047552] The two brown wires from the three-core cables should be joined together and insulated, not connected to the lamp [#18047552] The earlier wiring idea was wrong because there is another switch/lamp circuit in the room, so the red wire is the correct switched output for the lamp you are fitting [#18047534][#18047552]
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  • #1 18047362
    bocian1821
    Level 10  
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    Hello,

    I bought a new lamp for the kitchen and I'm having trouble connecting it. More precisely, with its removal. I tried different combinations and either the lamp is on all the time and does not respond to the switch, or the only reaction to the switch is the activation of the protection. Could someone give me a hint on how to do it? I have a normal single switch and want all the bulbs on at once. I attach photos of the installation coming out of the ceiling and in the lamp.
    Troubleshooting UK Kitchen Lamp Connection Issues: Wiring, Switches & Protection Activation Troubleshooting UK Kitchen Lamp Connection Issues: Wiring, Switches & Protection Activation
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  • #2 18047387
    bumble
    Level 40  
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    You have three wires, a power in, a power out, and a switch. Total 8 lives. Incoming 3 cores and leaving 3 cores. Identify them. You connect the phase wire from the incoming phase with the phase wire from the outgoing (3-wire wires) to this you connect the third wire from the two-wire (switch.
    You connect the neutral from the three-wire inlet to the neutral three-wire outgoing and to the lamp.
    The remaining wire from the two-wire switch also to the lamp.
    It was necessary to describe the wires before dismantling the junction box. I'll give you a drawing if you need it
  • #3 18047425
    bocian1821
    Level 10  
    Posts: 9
    Rate: 2
    Hi bumble,

    Thank you for your quick reply. It seems to be doing just that, but the switch still doesn't respond. Could you give me a schematic of this connection?
  • #4 18047439
    bumble
    Level 40  
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    Troubleshooting UK Kitchen Lamp Connection Issues: Wiring, Switches & Protection Activation

    Added after 3 [minutes]:

    What colors are under the switch, I will ask for a photo. Which phase is now when everything is disconnected?
  • #5 18047465
    bocian1821
    Level 10  
    Posts: 9
    Rate: 2
    He doesn't quite understand the questions. Sorry, I'm pretty ignorant on these things. I have three cables from the ceiling. Two three-wire - blue, brown, gold-green. And one two-wire - red and yellow-green. I have three entrances on the cube. I connected it like this: two brown cables from three-core cables and red from two-core cables connect to the brown cables from the lamp. The two blue three-wire and the yellow-green two-wire connect to the blue wires in the lamp. The other two yellow-green cables from the three-wire wires are connected in the middle socket and the metal housing of the lamp.
    Troubleshooting UK Kitchen Lamp Connection Issues: Wiring, Switches & Protection Activation
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  • #6 18047482
    bumble
    Level 40  
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    Nooooo. You're shorting the switch. What colors are for the switch? Probably red and yellow-green.
  • #7 18047493
    bocian1821
    Level 10  
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    Yes, in a 2-wire cable there is red and green-yellow.
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  • #8 18047496
    bumble
    Level 40  
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    I am asking what is under the switch when you unscrew it?

    Added after 3 [minutes]:

    As there is red and yellow-green under the switch, it should be like this
    From three-wire brown together with red from two-wire and nowhere else. From the three-wire blue together and to the blue in the lamp. From three-core yellow-green together and to the middle in the lamp. From two-wire yellow-green to brown in the lamp.
  • #9 18047532
    bocian1821
    Level 10  
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    This is what it looks like under the switch
    Troubleshooting UK Kitchen Lamp Connection Issues: Wiring, Switches & Protection Activation
  • #10 18047534
    bumble
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    Approx. Well, it's different. Is there a second switch in the room?

    Added after 1 [minutes]:

    My previous advice is outdated don't connect like this.

    Added after 52 [seconds]:

    Do you have anything to check if there is current on the wire?
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  • #11 18047547
    bocian1821
    Level 10  
    Posts: 9
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    There is a second lamp in the room. The switch is double - two switches and one turns on the light in the dining area - here he installs a new lamp. And the other turns on the light in the kitchen - two fluorescent tubes in the ceiling
    Troubleshooting UK Kitchen Lamp Connection Issues: Wiring, Switches & Protection Activation

    Unfortunately, there is no metric. Even if I connect the lamp in the dining area or leave the cables hanging, it does not affect the operation of the light in the kitchen
  • #12 18047549
    bumble
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    But in the kitchen it works normally? Is there a second switch for the dining area or just this one?
  • #13 18047551
    bocian1821
    Level 10  
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    Sorry, if I disconnect the lamp in the dining area, there is no light in the kitchen. Which makes sense considering the circuit is disconnected. Overall, I thought it would be much easier.

    Added after 50 [seconds]:

    The kitchen is divided into a cooking and dining area. There is only one switch with two switches.
  • Helpful post
    #14 18047552
    bumble
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    Approx.
    It's supposed to be like this. Of the three-core two brown together and not connected anywhere else. From the three-wire two blue together and to the blue in the lamp. All yellow-green together and to the middle in the lamp. Red to brown in the lamp.
    Give a photo of the switch on the back, i.e. where the cables are connected.

    Added after 2 [minutes]:

    If you settle, there is no phase continuity on the switch because the brown ones are disconnected. At the switch, one red is the kitchen, the other is the dining room.

    Added after 1 [minutes]:

    Two brown together and insulate. Red to the brown lamp, blue together and to the blue lamp. Yellow-green together and to the middle. It's a pity you didn't put the switch in right away.
  • #15 18047560
    bocian1821
    Level 10  
    Posts: 9
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    Troubleshooting UK Kitchen Lamp Connection Issues: Wiring, Switches & Protection Activation Troubleshooting UK Kitchen Lamp Connection Issues: Wiring, Switches & Protection Activation

    The switch on the left looking from the front is the one from the lamp that I connect
  • #16 18047562
    bumble
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    Okay connect.
  • #17 18047580
    bocian1821
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    It works 👻👻👻
  • Helpful post
    #18 18047582
    bumble
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    :sm9: Good luck.
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Topic summary

✨ The discussion revolves around troubleshooting a kitchen lamp connection issue in the UK. The user is experiencing problems with the lamp either staying on continuously or activating the protection circuit when attempting to use the switch. Various wiring configurations are suggested, focusing on the correct connections of three-core and two-core cables. Key advice includes ensuring that the phase wire from the incoming supply is properly connected to the outgoing phase, and that the neutral wires are correctly linked to the lamp. The user provides images of the wiring setup and the switch, leading to a resolution where the lamp successfully operates after following the correct wiring instructions.
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FAQ

TL;DR: 3 cables at the ceiling (two 3‑core + one 2‑core) often confuse loop‑in wiring; "Two brown together and insulate." Wire the switched live to the lamp, keep permanent lives looped, and tie neutrals together to stop trips. [Elektroda, bumble, post #18047552]

Why it matters: Miswiring can leave fittings live or kill other lights; this helps UK DIYers fix a single/double switch lamp safely.

Quick Facts

  • UK/EU colours: brown = live (L), blue = neutral (N), green/yellow = earth (CPC). Sleeve the switched live brown. [Electrical Safety First, 2023]
  • Most domestic lighting circuits need 30 mA RCD protection due to concealed‑cable rules in BS 7671:2018+A2:2022. [IET, 2022]
  • Typical UK lighting MCBs are 6 A or 10 A; keep loads and wiring sized accordingly. [IET, 2022]
  • Prove dead with a GS38‑compliant two‑pole tester (e.g., Fluke T110/T130) before any work. [HSE GS38, 2015]
  • Loop‑in method: join permanent lives (browns) together in a separate connector; do not feed the lamp from this join. [Elektroda, bumble, #18047552

How do I wire a new ceiling lamp with two 3‑core cables and one 2‑core switch cable?

Use the loop‑in method.
  1. Join the two brown permanents together in an insulated connector only.
  2. Join the two blue neutrals together and to the lamp neutral (N).
  3. Connect the red from the 2‑core (switched live return) to the lamp live (L). Join all green/yellow earths to the lamp earth terminal. [Elektroda, bumble, post #18047552]

Which wire is the switched live and where does it go?

In this setup, the red in the 2‑core to the switch is the switched live return. Connect that red to the lamp’s live (L). Keep the two brown permanent lives looped together but not on the lamp live. Join both blue neutrals together to the lamp neutral (N). Earths go to the lamp earth terminal. [Elektroda, bumble, post #18047552]

Why does the breaker/RCD trip when I flip the switch?

A miswired loop can short live to neutral through the switch wiring. If you tied the switched wire to neutral, protection will operate. As the expert warned: "You're shorting the switch." Separate the permanent lives, neutrals, and the switched live correctly as in the loop‑in method. [Elektroda, bumble, post #18047482]

Why did the kitchen lights go out when I disconnected the dining pendant?

You opened the permanent live loop. The two brown permanents feed other lights; if you separate them, downstream lights lose power. Rejoin the two browns in a separate connector and insulate. Do not connect this permanent live join to the lamp’s live terminal. [Elektroda, bocian1821, post #18047551]

Is it normal to find power‑in, power‑out, and a switch cable at the ceiling?

Yes. That is the common loop‑in method: one 3‑core brings power in, another carries power on, and a 2‑core goes to the wall switch. The lamp connects only to neutral and the switched live return from the switch. [Elektroda, bumble, post #18047387]

Do I need to connect earth to a metal light fitting?

Yes. Bond all green/yellow CPCs together and to the fitting’s earth terminal. Only double‑insulated (Class II) fittings without an earth terminal omit this. Check the Class II symbol if unsure. Maintain CPC continuity across the loop as required by BS 7671. [IET, 2022]

I don’t have a meter; can I still identify the right wires safely?

Do not guess. Isolate the circuit at the breaker, lock off if possible, and prove dead. Use a GS38‑compliant two‑pole tester to identify the permanent live loop, neutral group, and switched live. Avoid neon screwdrivers or non‑contact pens for proving dead. [HSE GS38, 2015]

What if the green/yellow conductor was used as a switch wire?

Green/yellow must only be used as a protective conductor. It cannot serve as a live, even if re‑sleeved. If a past installer used it as live, correct the wiring with an appropriate core and maintain a dedicated CPC. "Green‑and‑yellow is reserved for protective conductors." [IET, 2022]

Can I have all bulbs turn on together from one switch?

Yes. The lamp’s internal wiring usually parallels its bulbs. Connect neutral to the neutral group and the lamp live to the switched live return. Keep permanent lives looped only. Operate them from a single gang on your dual switch as desired. [Elektroda, bumble, post #18047387]

I have a double‑gang switch; how does that map to the ceiling?

Each gang switches its own switched live return. A single permanent live often feeds both gangs. At the ceiling, your lamp uses the neutral group and its own switched live (red). Keep the two browns looped together but off the lamp live. [Elektroda, bumble, post #18047552]

What connectors should I use for loop and earth joints?

Use quality lever or push‑in connectors sized for the conductors. WAGO 221 COMPACT splicing connectors handle 0.14–4 mm² and are rated up to 32 A. Place them inside a suitable enclosure or the lamp’s terminal cover. Ensure strain relief and no exposed copper. [WAGO, 2021]

What voltage should I expect when testing at the ceiling rose?

With power on and safe access, expect about 230 V AC between live and neutral. Expect 0 V between neutral and earth when correctly wired. The switched live shows 230 V only when the switch is on. Always test safely with a two‑pole tester. [IEC, 2009]

What final checks should I do before restoring power?

Perform a tug test on all connectors. Verify earth continuity from CPCs to the metal fitting. Confirm permanent lives are looped only, not on lamp L. Replace covers, energize, and test the switch. Prove the circuit dead again before any rework. [HSE GS38, 2015]

My switch does nothing and the lamp stays on. What did I miswire?

You likely connected the lamp to the permanent live loop. Move the lamp live onto the red switched return from the switch. Keep the two browns joined only to each other. Join both blues to the lamp neutral. Re‑test operation. [Elektroda, bumble, post #18047552]
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