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Hi, I'm Mike G and I'll be glad to assist you. I send you the request for a phone call.
You might want to check the white wire connection in the box where you changed the light fixture.
Sorry, didn't see you were in the UK. Check the neutral connection.
Where you changed the light. If all was working before changing the fixture.
To have voltage on the neutral, it means the neutral is open. It will be ahead of that box.
Visual inspection and pull on the individual wires at connections.
Anytime. I'm notified when a reply is made.
Using a non contact tester makes troubleshooting harder. You need a 2 wire voltage tester to continue.
Good, needed to know. Go to the panel and test the circuit there.
Set the meter to 300VAC and the panel that the circuit originates in.
That will do.
On the hot, neutral or both. Are you testing to earth?
Test to earth
What is it from hot to earth
The reading have me at a loss. I'm going to opt out and see if any of the other experts have a new thought on it. Stand by for the next expert.
I suspect that by those readings every circuit originating at that panel wouldn't work, due to a bad neutral connection on or ahead of the service equipment. Having only one not working is what stumps me at this point.
It sounds like you have wired the light fitting incorrectly and not wired the live to the next light into the live into the light.
How many different cable were there - LN&E in, LN&E out, Switch wire in/out
try this - turn you other lights on, take one live at a time and touch to another until you get them coming on.
These two will need to go into the sme connection but not the same as the brown to the new lamp
Yes in the new light, take them out - but wait until it is light before you attempt this.
You will need that neutral for the neutral connection on the lamp itself
Earths in the earth block too
Yes, the live has to feed this light and then carry onto the next
This is the way it should be wired.
If you have a tester then we know which is the live loop in - even if it is a black wire.
Separate them all then turn the power back on and see how many are live, if it is just the one then try the black against each of the reds and see if the lights in the other rooms come on.
Again, try when it is light and come back to me.
Ok, well done for sorting it but something that is nearly impossible via this means