I plan on creating a new circuit and running 12/2 to my microwave for an dedicated circuit. The current outlet for the microwave is old wiring running through conduit. The wiring comes in through a junction box labeled A, then runs about 3 feet over before dropping down the wall labeled B, and that runs into the microwave outlet box. It looks like that box A is already pretty crowded so it doesn't seem like the best option to run the new microwave circuit wire through the conduit via box A.
I would think the easiest solution would be just to put in a second outlet box and then run the new wire directly to it? I would have two outlets in the cabinet above the microwave, one dedicated to the microwave. Also, how can I tell what the capacity is of the old light/junction box that is running conduit? Maybe the box isn't overly crowded.