Wiring

faisalpandu

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Hi

Trying to change a ceiling light looking at the light there are two sets of wires coming down do i need to use both or can I use just one
1ad02845526648c381238e5c43afc449.jpg


To confirm black is neutral and red is live.
 
If you found the cables twisted like that then you need both because one will be going to the next light in the series (more than likely).
 
Hi

Trying to change a ceiling light looking at the light there are two sets of wires coming down do i need to use both or can I use just one
1ad02845526648c381238e5c43afc449.jpg


To confirm black is neutral and red is live.

Yes use both as looks like you are feeding another light or dual switches
 
Hi the ceiling light before was different had the following
e781802d57014c3200397bee81892c4a.jpg


3d368b0c86037d0d29cf3d25234c4b70.jpg


I connected both on each of the point in new ceiling light and the light keeps tripping. ??

Dunno where I am going wrong
 
What coloured cables did you undo/replace. Was it just brown and blue or either the red or black?

If you didn't touch either the red or black and you only swapped the blue and brown it should work.

If not, then you have got the other cables the wrong way around. One cable is the feed coming in/neutral and the other is part of the light switch. The black cable connected to the same terminals as the brown cable is known as a switched live.

What happens is electricity flows in via the red cable and then flows (via the other red cable) to the light switch. When light switch is on the electricity then flows from the red cable past the light switch to the black cable (known as switched live) to the same terminals as the brown wire for the ceiling rose light to work.
 
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I took all the cables out as the new ceiling light is different to the one I have on now. The new light is as follows

b80d47d3c8bda29f4f67bffe207d5245.jpg

ab54e5e505b13bc1c7cfec06477a2de1.jpg


I put both red with brown and both black in blue and earth in middle. Is that correct?
 
No you have dead shorted live to neutral
Chock block the two reds and put one black to live the other to neutral. as ktemp said one of the blacks is a switched live
 
No you have dead shorted live to neutral
Chock block the two reds and put one black to live the other to neutral. as ktemp said one of the blacks is a switched live

So both reds go in live. One black in neutral and one black in live?

Does it matter which black?

Both Earth in middle?
 
So both reds go in live. One black in neutral and one black in live?

Does it matter which black?

Both Earth in middle?


no don't do that lol
if second picture you posted was the original set up then you have to keep the config the same. Both reds connected together through a terminal block the one black to n and the other black to l and earth to earth
 
it shouldn't matter mate as one black will be live when switched
 
Thanks mate i get that with the black one on each l and n. Earth is middle one.

Both Reds in live correct?

I have 3 inputs in new light switch L E N
 
supply
_________________________red + Red_________switch___________________black--------------------


_________________________Black------------------------------------------------------------------------------

- - - Updated - - -

Thanks mate i get that with the black one on each l and n. Earth is middle one.

Both Reds in live correct?

I have 3 inputs in new light switch L E N


No mate you are not getting it the reds just need connecting together in a separate terminal block then a black to l and the other to n
 
Which separate terminal block?

31d1b16e9784fa61b7ab6cd60b905303.jpg


I have 3 blocks in my new light only as shown in pic above?

Apologies but will get there
 
Cheers mate now I get it :) Lol will give it a go tomorrow.
 
Normally the black that was switched live should have had red sheathing or red insulation tape (so it effectively becomes red and black).

As you're not keeping the same type of light fitting then I personally would use a junction box but you could use chock blocks that Ianb mentioned. Do you have a multimeter as it would help.

Without understanding difference between live and switched live and you're not sure what wire went where before you took them off then you may want to consider getting a spark in :)
 
have look at this give u some idears
 

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If you have a multimeter. With the power off use a resistance range to find which cable goes to the switch. With the light switch on there will be little or no resistance. Mark the black with red tape or whatever.

If you have no multimeter. Connect live and neutral from one cable to the light and turn power on. If the light comes on the other cable goes to the switch. Mark the black.
 
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