Protect NM cable with conduit
I want to put two light switches on an unfinished concrete wall in my basement. The NM cable will run across the room inside a dropped ceiling, and then I need to run it down the wall to a double switch box mounted on the concrete wall.
What is the best way to protect the two NM cables that run from the dropped ceiling down to the wall-mounted switch? I seem to recall that there are some restrictions on running NM cable inside standard metal conduit. The conduit will be very short, since it only runs from the ceiling down to the wall switch.