14 AWG must be protected at 15A, according to NEC 240.4(D)(3). 14 AWG can't be used on a circuit with a 20A breaker. The screw terminals are the better choice if you want to put 15 Amp receptacle on a 20 Amp circuit with 12 gauge wire.
Can 14 gauge handle 30 amps?
If the wire to the 30 Amp breaker is only 14 gauge, you don't have a breaker, you have a 30 foot long fuse, and it will burn in two before the breaker senses the need to trip. Check out the fan and light if you match the wire size to the breaker size. Yes, it is.
How many amps can 14 gauge wire support?
The NEC limit for 14-gauge wire is 20 amps, which means you should never use 14-gauge wire in your 240-volt circuits, only your 120-volt circuits, or the amperage will exceed the wire's capacity.