Undercab lights, which are best single wire due to final movement/placement all make back to a 4/11 with single mud plate for a dup rec, behind the stove.
That is a great idea, even if you can get the placement right, getting 2 cables closed up in some under cabinet lights can be tough.
I have a job going now that I have six 'little inch' under cab lights to wire with 12/2 MC I also will have a JB but I have the option of installing it above the dropped ceiling.
Bob
