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What is Sx really?


bobjunga
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Question

I am connecting a dimmer 2 with one local wall switch (connected to S1) and one remote wall switch (connected to S2). From the remote switch I have a line which is a closed connection to line voltage or an open connection. 

 

I see some diagrams where a switch connects between Sx and S1 (or S2) so that the switch either closes or opens a connection between Sx and S1.  I see other diagrams where Sx is connected to neutral and the switch is openning/closing a connection between line voltage and S1.

 

So if I dont need (or cant) 'power' the switch with Sx, I think I should just put a jumper between neutral and Sx.

 

But what is the purpose of Sx? What are its electrical characteristics?

 

--BobG  

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Sx allows the dimmer to be wired in 2 different ways. The 3 wire mode is more stable (less light fluctuations), while the 2 wire mode is providing when retrofitting to existing wiring. 

Just make sure that you follow the wiring diagrams in the manual.

 

Are you triggering different events with the remote wall switch? If not, you could connect both switches to S1. If you have existing wiring this will make things easier.

 

Also, I always add a bypass, even though technically it's only needed for loads under 50W.

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