Light Switch plus dimmer switch

PhilWarr · Jul 8, 2021

Hi All,

I have just moved into a new house and the lights in one of the rooms don’t appear to be working, than on top of that I am rubbish at electrics. The room has a light switch as you enter the room and a dimmer switch at the other end of the room. I am not worried about the dimmer switch, from the point of view if I need to get rid of it.

For some reason the light switch doesn’t work. I have one of those screw drivers that shows if there is electricity flowing and on the light switch the brown and black cables are live as the blue and grey don’t appear to be.

Can anyone point me in the right direction as to how this should be wired up?

Thank you - any help would be greatly appreciated.

Regards

Phil

littlespark · Jul 8, 2021

If your not confident with electrics, I’d advise finding someone who is….

but in the meantime, I would say that your dimmer is not designed to be used connected to an ordinary switch…. It says on it to be used with other DIMMER SLAVE(S)

With no guarantee, I would presume the 3 core (brown, black and grey) at the dimmer is the same cable that is at the regular switch. If those are disconnected at the switch, leaving just the other brown and blue (which should be within the same cable) connected either side of the regular switch (COM and 1-way, nothing in 2-way)….. does the light work?

DefyG · Jul 8, 2021

The wall box looks only 16mm deep, probably too shallow for most dimmer modules!

westward10 · Jul 8, 2021

It isn't earthed.

Dustydazzler · Jul 8, 2021

Can’t see how that switching arrangemen works

you gave a one way switch to an end of line 2 way at the dimmer

Dustydazzler · Jul 8, 2021

Oh and it needs earthing to the plate

littlespark · Jul 8, 2021

I think originally it was just a one way switch. Brown line and blue switchwire (needs sleeved)
Sometime in the past, a dimmer was added by running a 3C&E between the two switch points.

I still think thats the wrong type of dimmer for straight two-way operation

PhilWarr · Jul 11, 2021

littlespark said:
If your not confident with electrics, I’d advise finding someone who is….

but in the meantime, I would say that your dimmer is not designed to be used connected to an ordinary switch…. It says on it to be used with other DIMMER SLAVE(S)

With no guarantee, I would presume the 3 core (brown, black and grey) at the dimmer is the same cable that is at the regular switch. If those are disconnected at the switch, leaving just the other brown and blue (which should be within the same cable) connected either side of the regular switch (COM and 1-way, nothing in 2-way)….. does the light work?

That worked perfectly - thanks for your help.

Regards

littlespark · Jul 11, 2021

PhilWarr said:
That worked perfectly - thanks for your help.

Regards

Taking the dimmer out of the equation?

PhilWarr · Jul 11, 2021

littlespark said:
Taking the dimmer out of the equation?

Correct yes

Light Switch plus dimmer switch

PhilWarr

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