Originally Posted by rsteve12
Can I run 12-2 cable throughtout my new house and use 15 amp breakers and lighting/outlets when called for.
Yes, but why??? It is NO safer if that is your thinking.
The ONLY reason to breaker #12 on less than a 20 is for voltage drop, and in a residence this is typicaly a non-issue. If it is an issue a sub-panel is a much better idea.
That said, use a 20 amp breaker for #12, and a 15 amp breaker for #14.
Also, while I agree receptacles might be better served with #12 (not something I automatically
do BTW), there is no reason to wire residential
lighting on #12. I almost never do.