Smoke detection and lighting

[The apprentice]

Hi there, I was installing a smoke detector system (interlinked) while my mate changed the consumer unit. My problem is there was an existing smoke detector (not interlinked) with one 1mm cable at it so I used that as my supply to the interlinked system, after the fuse board was changed And energised I turned of the bedroom light which didn’t go off was almost like it dimmed and when I tested for voltage at the pendant it was 230 volts when I switched the light on or off any suggestions? I have to return tomorow to find the fault

 

[DPG]

Got to be a mistake in the wiring between the smoke and the pendant? I'd do some dead testing and confirm what is connected to what.

 

[The apprentice]

Got to be a mistake in the wiring between the smoke and the pendant? I'd do some dead testing and confirm what is connected to what.

The 1mm cable was into an existing smoke detector so I then put that as my supply and interlinked them green light came on the smoke detectors and tested them and all alarmed as normal

 

[littlespark]

So the smoke detector works, but the light switch now doesn’t turn off the light?
You didn’t work on the lighting circuit as such, just a supply from the lighting...

are you sure this problem wasn’t there beforehand?

disconnect the smokes from the circuit temporarily to see if they are causing the problem.

 

[The apprentice]

So the smoke detector works, but the light switch now doesn’t turn off the light?
You didn’t work on the lighting circuit as such, just a supply from the lighting...

are you sure this problem wasn’t there beforehand?

disconnect the smokes from the circuit temporarily to see if they are causing the problem.

Yeah, the smokes worked perfect, my problem is now the light, just a supply from the lighting that’s all, yeah that was my plan today to see what the problem is it is a weird one

 

[telectrix]

is it possible that you have picked up a L and a sw/L instead of L and N?

 

[DPG]

If the light dims rather than goes off I would say it is

is it possible that you have picked up a L and a sw/L instead of L and N?

There's got to be a wrong connection somewhere eh.

 

[littlespark]

was the old smoke ever working, or has it been wrong since forever?
crawl through the attic job now to see where the "feed" comes from

 

[UNG]

I'm sure I'm missing something here with the OP his mate was doing the consumer unit so what does his mate think the problem might be, also not sure why the fault needs a return visit today unless it was close to pumpkin time