" wrote in message
oups.com...
Greetings,

I would like to confirm that, according to the NEC, there is no reason
why you cannot use 12/3 connected to 15 and 20 amp breakers (one on
pole A the other on pole B) and then (say 30 feet away) branch into two
circuits (a 15 amp circuit on 14/2 and a 20 amp circuit on 12/2).

Definately WRONG.

You cannot use 14 anything on a 20 amp breaker in any case.