LED Bulbs won't work together on same circuit.

[FatAlan]

Thank for the update. Whoever suggested the loose neutral gets first prize

 

[FatAlan]

Andy-1960 ...I take it you didn't do the original wiring?

 

[ImpededLoop]

Thank for the update. Whoever suggested the loose neutral gets first prize

Sounds like it was the switch wire rather than the neutral.

Glad the OP got the problem sorted.

 

[Andy-1960]

Love to take the praise.. but think it may have been a loose switch wire...

 

[Richard Burns]

Thank you for the feedback, always nice to know how things turned out.
I may have been right about a loose connection, amazing!

 

[FatAlan]

think I need to go back to the trainee thread:

 

[Fullerbull]

Not to blame Andy! Not sure what you mean by switch wire rather than neutral. Both the roses and the switch only had a single red (live) and black (neutral) plus earth, which is not like any other circuit in the house. So how the rest of the circuit is wired I do not know. It was put in about 30odd years ago and I was working in those days so didn't see it installed.

 

[Andy-1960]

Not to blame Andy! Not sure what you mean by switch wire rather than neutral. Both the roses and the switch only had a single red (live) and black (neutral) plus earth, which is not like any other circuit in the house. So how the rest of the circuit is wired I do not know. It was put in about 30odd years ago and I was working in those days so didn't see it installed.

If you only have 2 cores at the switch, one must be live and the other must be a switch wire, very often in a 3 plate lighting circuit (see pic), a twin and earth cable run to the switch is used like this with the red core being the live feed to the switch and black core used as the switch wire. If you have the same at the ceiling rose and the red has become the switch wire and the black is the neutral... It looks like there may be junction boxes somewhere...

View attachment 35966

 

[Fullerbull]

Thanks Andy - there could well be junction boxes elsewhere. Like I say I didn't see any of it go in. Furthermore the builder went bust in the middle of the job, which meant that a number of things were not as expected!