Wiring a new light fitting.

[scorps]

Blonde moment im afraid, removed ceiling rose which has one red wire two black and the earth, new lamp fitting has blue, brown and earth plus a seperate earth which isnt wired in to anything. I would normally put the blue to the black and the brown to the red in the block however I now realise that one of the black ones is possibly the switch wire and I dont know which one. I presume that I would put the two earth wires facing each other in the block too as it is a metal fitting,
Could someone enlighten me please I really need to have it wired in tomorrow.
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[pinkyfloyd]

When it comes to wiring a plug I'd be able to tell you how its done.

When it comes to house wiring its a whole different ball game and if you are not sure then the best thing to do is:

https://2.bp.blogspot.com/--IkemBas1R4/TrJrc0MnwDI/AAAAAAAAAOI/y3jSXf09TGY/s1600/electrician.jpeg

Would hate to have that avatar of yours change to "things I said!"
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Teflon-Mike:I think I agree with just about all Pinky has said.

[scorps]

im clued up on isolating everything, ive got a DIY bible somewhere that should cover it but im buggered if I know where it is. Im pretty good at stuff like this usually, going to have to ut the original fitting back as im on my own tomorrow and the light fitting is too heavy, why my daughter wants a black chandilier is beyond me but hey ho.
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[gfrancisdev]

earth->earth
red->one of the others on the light
others->the other one

the 2 black ones are twisted together right? should be something like 2 lines from a couple of switches on the same ring

(disclaimer: not my fault if it starts a fire)

[stinkwheel]

Remember that with lighting, switch off does not necessarily mean it isn't live. Always isolate at the consumer unit. A black can be live.

All earths go together.

One red, two black seems a tad odd. You are missing cables because three core + earth is usually two red and one black. I'd have a pull on them and see what tangled nighmares descend from the plaster (or if it's upstairs, pop up into the loft and have a look).

I would expect either one twin and earth cable coming down into the ceiling rose from a junction box above the ceiling OR I'd expect three twin and earth cables coming into the rose (loop in, loop out and switch).

In the former case, I'd put brown to red and blue to black. In the latter case, I'd put all the reds together. The loop in and loop out blacks and the blue together and the switch black to the brown.

Anyway. Attached is my diagram of what SHOULD* be happening from where I put new lights into my bedroom recently. Doesn't all have to be happening in the same junction box/rose though. Ignore the switches, it's a double switch setup but the wiring into the rose is the same.

*Should and is are two different things. It's red and black, it's been up there a long time and any Tom, Dick or Harry could have been "at" it.

EDIT: Tom, Dick, Harry or gfrancisdev.

https://www.bikechatforums.com/download.php?id=87211
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[scorps]

I will have a proper look tomorrow, something isnt adding up and ive found my wiring info, I checked to make sure that wires hadnt come adrift once id fixed the ceiling rose in place and switched it on again, this time one bulb came on then popped, its a five bulb fitting, ive not seen this before so im wondering if its a faulty light, ive only ever had a head scratching episode wiring lights in before and that was because my bedroom also had one of those string switches dangling by the headboard.

I noticed all the other lights worked okay when i flipped the switch back in the comnsumer unit. I hate it when things dont go to plan.
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[oldpink]

older house wiring can be a nightmare and sometimes not what you expect
bit late now but recently I've taken to using my mobile phone camera to take pictures
if I'm removing old fittings and replacing them as the colour codes arn't always what they should be

also I always have a test meter with me to check circuits or for live wires

not exactly a blonde moment, thats an issue most people would struggle with
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Theory & hazard 24-may 2016, CBT 8th June 2016, MOD 1 2nd Aug 2016 Mod 2 2nd-Nov 2016 - Current bike CBR 600 RR

[stinkwheel]

[oldpink]

[pike]

Did you sort this out?

In theory.....

Ordinarily you would have 2 x twin and earth. The two red wires would be a live loop (coupled together). One black wire would be the neutral, the other black wire would be the return live from the Switch (line). All earths together in a block.

New light fitting:

Connect all earths together (green and yellow)
Connect switch line black live return to the brown. (place red sleeving over the black switch line cable)
Other black cable is the neutral which connects to the blue.

Edit: Image added

https://www.flameport.com/electric/lighting_circuits/ceiling_rose_end_oldcolours_T.png

[scorps]

pike you reply leads to the conclusion ive got mixed up with theswitch, best go and get a thingumy to test this. if I can sort a double loop one this is not going to beat me, thanks for the info and diagram chaps.
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[drzsta]

Connector block both reds they are the loop in/out

One black is neutral - other is Sw Live.


Depending on what sort of light it is most will run fine with reverse polarity though



You don't need a tester, if the two don't work one way - then swap them round!


If that dosnt work it's a faulty fitting.

[cimbian]

One of the blacks is switched-live and generally has a piece of red tape on it to indicate so. The other red and black are the loop-in system.

If you are unsure then pay someone to do it for you.
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22PlusY
Current: Moto Guzzi 1100 Breva. Previous: Honda XL650V TransAlp
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[drzsta]

[scorps]

sorted it all, the light is faulty so Ive just put the original back. As my grand daughter managed to smash one of the glass pieces to the horrendous chandelier I have told my daughter she can have a bloody lamp shade like everyone else. oh and I have tagged the switch wire.
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[cimbian]

[syl]

What colour cables are in the lightswitch?

If red, likely that the red wire in the light is the switched live and the two blacks are the neutral loop in/out.

If black, it's wired up weird.
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[calum17]

[cimbian]

[pike]

[cimbian]

[scorps]

Im getting confused reading this thread now lol.

its two cables but wired correctly now which is the main thing. Daughter has now purchased a pendant light fitting as I cant be arsed to try again. Ive a crick in my neck and aching shoulders from trying to hold the bloody chandelier on my own, sod that I shall stick to painting and plumbing and wiring in cookers.
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[J4mes]

[drzsta]

[scorps]

I know James which is why Im particularly vigilant, I dont however believe in paying for a professional to do something that Ive always managed to do before all this health and safety stuff came in. I would have phoned one of my electrical colleagues had it not been the Christmas break. I will not touch gas though. I think this house is RCD but it hasnt had the latest refurbs that our company deal with so not all the wiring has been upgraded yet. Try explaining this upgrade to a tenant whos moaning that their cooker worked perfectly fine for 30 years, when youve gone from B to D
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