Can 12 AWG handle 30 amps?
Minimum circuit ampacity 24 amps. Maximum breaker 30 amps. Bingo 30 amp breaker with 12 AWG conductor, you could use 10 AWG but the NEC would not require it. There are times when feeding motor loads that the breakers are rated much higher than the conductors.
How many amps can 12 gauge Romex?
20 amps
“Twelve-gauge wire is good for 20 amps, 10-gauge wire is good for 30 amps, 8-gauge is good for 40 amps, and 6-gauge is good for 55 amps,” and “The circuit breaker or fuse is always sized to protect the conductor [wire].”
How many watts can 12 3 wire handle?
12 gauge wire is rated for 20 amps peak, 16 amps sustained. On a 120 volt circuit, 120 * 16 = 1920 watts. On a 240 volt circuit, 240 * 16 = 3840 watts.