I am installing a rectangle of 3 x 4 recessed can lights in the ceiling and would like to have 4 separate circuits where each individual row of lights can be illuminated by its own switch.
This means that the lamp in each corner would be lit if either or both of the switches for those rows are closed. Four possible combinations are shown here:
I looked at relays and multi-way switches but could not find an example of how the corner lights can be wired and still only use four switches.
If anybody could point me in the right direction, that would be great. Thanks.