Are either of these ok:
a) Two NEMA-5-20 outlets, each has a run of #12 wire, that runs all the way to a single breaker, which then clamps 2 black #12 wires.
b) Two NEMA-14-50 outlets, each has a run of #6 wire, that runs all the way to the breaker which clamps on two red leads and two black leads.
Best Answer
It depends on the specifications of the breaker. If it allows 2 wires then OK. If not, just connect the two wires to a third wire (pigtail) and connect that wire to the breaker.
No. See Wire two 14-50 outlets to 50 amp breaker