DIY - Looking for advice on a re-connecting a ceiling rose loop

andy_baz · Dec 5, 2024

Looking for advice on how to re-connect a ceiling rose loop connector.

I am trying to achieve room 1 and room 2 lights to be independently on and off. This previously worked until i decided to try and change the fitting without taking a photo of the wires as they were when working. Yes i know, school boy error.

The ceiling rose is in room 1, room 1 has a 1 light and 1 switch.

In the ceiling rose it has 3 feeds into it, all 3 have Live Neutral Earth.
The house uses old red, black and green/yellow wires.
None are identifiable as main feed or switch feed. All look same (no sleeve on switch input).

Room 1 ceiling rose feeds to room 2, room 2 has 1 light and 1 switch.

I have found many diagrams online but am struggling as i can't identify which cable is which (main or switch etc). I currently have room working correctly but room light permanently on!

Attached is a diagram i am thinking of following

[ElectriciansForums.net] DIY - Looking for advice on a re-connecting a ceiling rose loop

westward10 · Dec 5, 2024

Do not follow the top picture that will create a dead short. Might be optimistic we can advise from here as you need to establish the cable to the switch, can you show some pics of the actual wiring?

andy_baz · Dec 5, 2024

westward10 said:
Do not follow the top picture that will create a dead short. Might be optimistic we can advise from here as you need to establish the cable to the switch, can you show some pics of the actual wiring?

i shall post a pic of the wiring shortly ive just popped out.

The top pic is the same as the bottom, it's just before the pendant light cables are inserted, as per this youtube video:

View: https://www.youtube.com/watch?v=z-KRtweXVi8

I appreciate your help thank you

andy_baz · Dec 5, 2024

westward10 said:
Do not follow the top picture that will create a dead short. Might be optimistic we can advise from here as you need to establish the cable to the switch, can you show some pics of the actual wiring?

Good luck untangling this mess

Currently room 1 light is permanently on and room 2 is not working, although it has been earlier on today, so not sure why it’s not now as I hadn’t changed anything since my first message.

andy_baz · Dec 5, 2024

andy_baz said:
Good luck untangling this mess
Currently room 1 light is permanently on and room 2 is not working, although it has been earlier on today, so not sure why it’s not now as I hadn’t changed anything since my first message.

here is the same photo as a drawing to hopefully simplify the process

westward10 · Dec 5, 2024

andy_baz said:
Good luck untangling this mess
Currently room 1 light is permanently on and room 2 is not working, although it has been earlier on today, so not sure why it’s not now as I hadn’t changed anything since my first message.

Which room is that from?

andy_baz · Dec 5, 2024

westward10 said:
Which room is that from?

Room 1 ceiling rose (my poor attempt to sort it) , room 2 hasnt been touched.

westward10 · Dec 5, 2024

It is going to be impossible to tell you how to connect them unless the switch cable can be established.

andy_baz · Dec 5, 2024

westward10 said:
It is going to be impossible to tell you how to connect them unless the switch cable can be established.

I thought as much. How would you go about identifying the switch cable.

And could offer a guide to wiring based on the info if we knew which wire was which?

Appreciate the time and effort, thanks

littlespark · Dec 5, 2024

Do you have any testers there? A simple multimeter is sufficient to find the switch.

I’d advise not to reenergise the circuit at the moment.

andy_baz · Dec 5, 2024

littlespark said:
Do you have any testers there? A simple multimeter is sufficient to find the switch.

I’d advise not to reenergise the circuit at the moment.

I can soon get one, how exactly do I identify the switch…I’m assuming it’s the one without power in it

brianmoooore · Dec 5, 2024

All that is wrong (apart from your blue and brown flex being the wrong way around) is that the single black should be in the terminal where the two blacks are now, and one of those blacks should be where the single black is. The problem is determining which.
Get it wrong, and there will be a big bang, a damaged switch and a damaged MCB.
A way you can check is to swap one over, ensure the switch is OFF, turn the power on and check if the lights further down the chain from this one work as normal. If they do, you've probably got it right. If they don't, switch off the power, try the other black as the single and check that the other lights work.

mainline · Dec 5, 2024

andy_baz said:
I can soon get one, how exactly do I identify the switch…I’m assuming it’s the one without power in it

Power off !
The switch wires will be the ones that go low resistance when the switch is turned on and go open circuit when its off.

DIY - Looking for advice on a re-connecting a ceiling rose loop

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