Dimmer/smart switch combination

[blueheart]

I'm replacing a 2 gang 1 way dimmer with a 2 gang 1 way dimmer and on/off switch but not sure how this would wire. I have 4 wires going into the old dimmer ,2 comms and 2 L1 but the new dimmer has 5 terminals with 3 terminals in the dimmer module and 2 in the smart switch can anyone enlighten me ? Thanks

 

[Taylortwocities]

A photo of the original wiring will help.

 

[blueheart]

 

[blueheart]

Thanks ,won't be using earth as the unit is plastic

 

[Taylortwocities]

The wire that is in COMMON on the old switch goes to the L. The wire in 1 way goes to L1.
Same for the other half. Dont mix the wires up.

Um. The new switch is a double width plate. Your old switch is a single width. How are you going to sort that?

 

[ericmark]

The big question is are they all on the same circuit, i.e. does one circuit breaker turn off all?

I have a 4 gang switch, with two low voltage circuits, and one extra low voltage circuits, so am aware one can not always combine two circuits, the smart switch you have uses a single line feed, the old switch uses two line feeds, it may be they can be combined, but also combining could cause a borrowed neutral, which is both dangerous and will cause rcbo's to trip.

I did have a problem with that 4 gang switch where the wrong line was used, which did cause the RCBO's to trip, and if the extra low voltage circuit and low voltage got mixed up it would fry the smart relay.

 

[blueheart]

The wire that is in COMMON on the old switch goes to the L. The wire in 1 way goes to L1.
Same for the other half. Dont mix the wires up.

Um. The new switch is a double width plate. Your old switch is a single width. How are you going to sort that?

Firstly, yes i have to replace back box. Does it matter which wires 2 wires go to which module ?

 

[blueheart]

The big question is are they all on the same circuit, i.e. does one circuit breaker turn off all?

I have a 4 gang switch, with two low voltage circuits, and one extra low voltage circuits, so am aware one can not always combine two circuits, the smart switch you have uses a single line feed, the old switch uses two line feeds, it may be they can be combined, but also combining could cause a borrowed neutral, which is both dangerous and will cause rcbo's to trip.

I did have a problem with that 4 gang switch where the wrong line was used, which did cause the RCBO's to trip, and if the extra low voltage circuit and low voltage got mixed up it would fry the smart relay.

Yes one breaker turns off all the lights ,it's a one bedroom flat.

 

[Taylortwocities]

Yes one breaker turns off all the lights ,it's a one bedroom flat.

Then you could have bought a 2 gang switch on a single plate.

 

[blueheart]

Then you could have bought a 2 gang switch on a single plate.

Unfortunately not in the style , it's a I lumos and i'm just following orders !