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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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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