FIRST OF ALL If your overcurrent protection device (circuit breaker) is a 30 amp, YOU CAN NOT USE NO 12 20 AMP RATED WIRE, the wire isn"t sufficiently protected!!! The breaker will allow 30 amps to flow while the wire only has a 20 amp ampacity!!!!!!!!!!!!such a configuration would allow the wire to heat up greater then permitted.
If your load allows the use of 12 gauge wire, then you would need to protect it with a 20 amp overcurrent protections device NOT A 30
NEXT if the load draws 24 amps, then you would use a wire that has at least 30 amps ampacity as 24 is 80% of 30..........
Now that the wire size (10 gaube) is selected based upon the load, you need to protect it with a 30 amp breaker
SOOOOOOOOOO the 30 amp breaker is fine but you need 10 gauge wire
The voltage rating of a wire is NOT the same as its ampacity. Just because youre at 240 volts you still need wire of sufficient ampacity to handle 24 amps AND THATS NO 10
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