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PostPosted: Sat Sep 09, 2017 10:21 pm 
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I'm replacing an existing on/off switch in a 2-way circuit with a dimmer.

I was expecting to see L1. L2 and Com on the old switch as this is what's in the new one.

But it actually has 4 terminals. Marked 1, 1, 2 and 2 (it's and MK grid switch)

I've taken the two black wires that were in each "2" and connected them to L1 and Com. The switch works to dim the light.

So I'm left with the two light coloured wires that were in each "1" and goes back to the other switch. Which terminals on the new dimmer should they be connected to?


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PostPosted: Sun Sep 10, 2017 6:59 am 
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If i'm reading your post correctly the pic is the old switch. This is an intermediate switch and should be replaced with an intermediate switch.

I assume you actually have 3 way lighting ?

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PostPosted: Sun Sep 10, 2017 6:57 pm 
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Yes, sorry. I should have made that clearer. The picture is of the old switch.

I'm pretty sure it's only two-way lighting. If there is a 3rd switch then it's well hidden!


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PostPosted: Sun Sep 10, 2017 7:01 pm 
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Squeege wrote:
Yes, sorry. I should have made that clearer. The picture is of the old switch.

I'm pretty sure it's only two-way lighting. If there is a 3rd switch then it's well hidden!


The clue is in the pic you posted. it says "Inter" short for intermediate and the 4 terminals.

Either way you need to replace like for like, unless you can easily rewire,

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PostPosted: Sun Sep 10, 2017 7:07 pm 
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If that is the old switch then wine~O is right as that is an intermediate switch, which is connected to the two strappers (as it should be) you can't change it to a dimmer with out alteration to the wiring.

When you have 2 way and intermediate (as you seem to) you put the dimmer at one end, but it also means if you use the an on off switch, the lights will only come on as bright as the dimmer is set for, which is why most people don't have this set up. It is also why some bright person invented the Master / slave dimmer. (You have one master and as many slaves as you want. (usually 2)

As as aside, is there another wire in the back box of the switch you have taken a picture of? (There should be, not counting the earth)

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PostPosted: Tue Sep 12, 2017 2:25 pm 
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Thanks, both. Much appreciated. I really can't find another switch in that room - but nothing in this house surprises me any more.

That switch was actually the left-hand of a 2-gang MK grid. It's really only the right-hand (1-way switch for an en-suite) that I wanted dimmable.

So I guess my best bet is to just replace the right-hand module with an MK LED dimmer. I think it's quite an old-style MK grid, so not sure if the newer LED modules will fit it though.

Yes - there was another wire in the back of the box. From what I recall it was two brown wires that had been connected together.


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