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Discuss Light switch reversed in the Electrical Forum area at ElectriciansForums.net

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Have just replaced an old single plastic light switch with stainless steel version (also added an earth wie to connect switch to metal back box). Original had Red wire into Com, Yellow in L1 and Red in L2 - all single wires. New switch was identical setup and I marked cables before removing original, so 100% same setup, BUT the light comes on when switch set to off & vice-versa.

I could spin the whole switch round which I presume is safe (or is it feasible to swap the L1 & L2 cables?), but just like to understand why this has happened when nothing is different apart from the addition of an Earth wire. I understand the com/L1 connections, but not sure what purpose the yellow in L2 has on this switch - I did 2 other rooms & they had 2 and 3 reds respectively in Com and just a single red which I put in L1.

Thanks
 
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