Fibaro dimmer 2-way wiring

[barthompson 0]

I am considering purchasing a set of Fibaro dimmers. I have read as much as I can find out about them but wish to ask/confirm one or two things. The most complex situation I will have is as follows…

In my lounge I have a set of downlighters, which is controlled by 2 bi-stable switches (one either end of the lounge) which are wired in a 2-way format. Ie, each switch has a COM, L1 and L2 connection. In case it matters, I have a 2-wire wiring system (not 3-wire).

Firstly, what is the best method to wire in the dimmer to maintain the other 2-way switch which is connected to it? I cannot find a full 2-way wiring diagram.

Secondly, am I right in saying that a second switch (in the same box) can also be connected to the dimmer which enables the control of another Z-WAVE enabled product via association. In this instance, I would like the spare switch to turn a lamp module on or off (but will have to be another brand because as far as I am aware, Fibaro don’t manufacture these). Have I understood this correctly? If so, how is this second switch wired in? The wiring diagram in the manual show only 3 wires coming from the double switch. However, I *think* I will have already used all 3 terminals with my 2-way switching set up. (But perhaps not depending on the answer to the first question). Finally, even if I haven’t used 3 terminals for my 2-way switching arrangement, surely the second switch needs at least 2 wires (with only 1 spare terminal). Does one have to share the Px terminal?

I look forward to your advice and guidance. Many thanks in advance.

[jonny 0]

I got a fairly good answer from this thread

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[davedotnet 0]

I think i've responded to this type of query often. One of the challenges is that; using the current wiring in the prescribed way, means, that one of the switches will at some point be devoid of power (electricially isolated). However, I think there's probably a way to go, if the wires are repurposed (not sure what your local electrician would think).

Were you thinking of installing ZWave switches, or placing ZWave devices behind existing switches ?

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EDIT: If we could solve this conundrum, we'd help a lot of British homes fit home automation to their lights easily.

[jonny 0]

I'm thinking of using two 3KW relay switches. One for upstairs, one for downstairs. If the second switched output can be used as scene trigger, then it could be setup to turn the other switch on/off. This would mean killing the physical two way switching (strappers) or whatever they're called.

I'm sure I've missed something, so perhaps someone can point it out to me

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[davedotnet 0]

I think iit would be easier just to use Association and link the two devices together. That's how I do all my two-way switches. No interference from Fibaro at all, just using the inherent capability of ZWave devices.

You mention relays, do you have your light boxes wired for both Live and Neutral ? If so, none of this is a problem. If you only have switched Live then you have a challenge on your hands.

[jonny 0]

I have both in the house. Modern extension is both, old house Black/Red for me.

[davedotnet 0]

@jonny, you house is definitely the exception. Typically, the light ring main runs around the light fittings, not the switches. For the old part of the house where you have black and red, both of these would be live (one switched live). Some electricians use to stick a piece of red insulation tape around the black wire to indicate it was. If you have normal SPST switches on the end of your red/black wires then you have conventional wiring.

When I had my house built, I had to get the electrician to run my lighting main around the switches, not the lights. This was because I knew I needed to power my (ZWave) light switches. Not only that, you have to provide 4 wires (live, neutral, earth and switched live), so it would be 3core twin and earth.