I'm remodeling a kitchen and I need to junction 14 gauge wires for a lighting circuit that are near impossible to get to or re-route. Is it permissible to junction 14 gauge wires in the same box with a 12 gauge dining room receptacle? Just to be clear, I won't be co-mingling #12 and #14 wires on the same circuit, I'm only going to have them in the same box.
Also, I know the rules about how many wires can be in a certain box. I was thinking about using 4S metal box with a mud-ring to ensure I have plenty of space.