This is a voltage drop question. A voltage at 30 amps needs to be stated to answer the question.
You would need to use a wire size that is rated for at least 40 amps to be safe and to meet the requirements of the air conditioner. A common wire size for this application would be 8 AWG copper wire, which is rated for 40 amps.
# 8 RW90
A #3 copper wire with an insulation factor 90 degree C is rated at 105 amps.
This is a voltage drop question. A voltage must be stated to answer this question. I do not disagree with the previous answer but wanted to add that, generally, 14 gauge wire will carry 15 amps. If distance seems to be a problem and you don't have enough information to do an actual calculation, up-size the wire to 12 gauge.
Looks like You need to run #10 to get 10 amps at 600 feet. You will have a voltage drop. You might only have aprox. 107.676 volts at the end of the run. You will do a little better if you use strand wire. Good luck.
#6 awg copper
AWG # 6 copper
10 amps
You would need to use a wire size that is rated for at least 40 amps to be safe and to meet the requirements of the air conditioner. A common wire size for this application would be 8 AWG copper wire, which is rated for 40 amps.
You will need a 40 amp breaker using AWG # 8 wire running it a distance of no more than 50 feet.
10 gauge
Use the Related Link Website. At the same website check out wire size calculator. You need a #8 wire to get a full 30 load at 100 feet.
# 8 RW90
As a service entrance wire you need AWG # 3/0 gauge copper.
For single phase 30 amps at 120 volts you would need a #8 copper wire with an insulation rating of 90 degrees C.
A #3 copper wire with an insulation factor 90 degree C is rated at 105 amps.
Use AWG # 3 copper.