I am trying to replace standard plastic light switch with smart steel one but old switch just had two connections for red and black whilst new one got three. Tried using L1 (red) and L2 (black)- nothing. Used L1(red) and L3(black) (remembering to earth switch) worked but on/off upside down - can't inverse switch as earth wont reach. Is it safe to simply swap the red and black round the other way - Red to L3 and Black to L1 - in other words does it matter which way round - Or am I just being plain stupid?
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