" 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).

Thank you for your time and energy,
William

I know of no code section that prohibits you from reducing the size of a
breaker on a given conductor.

As others said in the future there is a greater chance of someone installing
a oversized breaker for the smaller wiring. I would not do what your
suggesting.