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Engineer54
Have to agree with many of the comments here, if you are wiring lights in conduit, then 2 plate is the preferred method. With T&E or structured cable installs then the preferred method is more often 3 plate as you do not end up with neutrals and joints in switches.
Now wait for those that will come out and say ''I always loop through the switches'' for all my lighting circuits, saves me working on a step ladder and getting sore arms!! lol!! :sad_smile: