@romad , a few years ago there was a good run of threads related to the ins and outs of installing dedicated circuits, and because of those I learned something that I had done was violating code and may have nullified my home owners in the event of fire.
Anyway, I had put in some new circuits for dedicated lines and I used 12 gauge wire and 20A outlets, BUT I decided I would use 15A circuit-breaker to protect those circuits with as I felt that since a 15A CB should trip at a lower heat than a 20A CB I would be going the extra mile to protect those circuits. Which I still think is technically true, however I found out here that regardless of what size wire is used, the breaker determines what amperage the circuit actually is, and therefore a 20A outlet (which will accomodate a 20A appliance) on a 15A circuit (which is what I turned my circuits into by installing 15A breakers, despite the 12 ga wire) is a no-no.