| Re: lutron wiring help please!
It is fairly simple to do what you are after and shouldn’t require an electrician unless you are unsure of what you are doing. Normally in a two 2-way installation the ‘Live’ and ‘Switched Live’ wires are connected across terminals ‘L1’ and ‘L2’ as opposed to ‘Common’ and ‘L1’ as found in a 1-way installation. L1, L2 and Common are then interconnected between both switches, usually with a 3-core and earth cable (note that the common is only connected between the switches and goes no further). However, you have indicated that there is exactly the same number of wires behind both switches; therefore it appears the electrician who originally wired the lighting did some of the connections elsewhere as opposed to at the switch itself.
If you feel confident enough, switch off the electricity, isolate the one switch (disconnect it in a safe manner), and short the wires currently connected to terminals L1 and L2 at the other switch using a terminal block. If when you reinstate the power the lights turn on, you have confirmed that the wires currently connected to L1 and L2 are actually Live and Switched Live, which can then in turn be connected to the new dimmer. If the lights do not switch on I would recommend you get an electrician in as the installation is doing something slightly unconventional and will take an electrician to deduce what is going on.
I must stress again that you need to be confident in what you are doing before undertaking any of the above.
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