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6 AWG is the nominal wire size in copper for 50 amps. 300 feet of 6 AWG has a resistance of .12 ohms. At 50 amps the voltage drop across .12 ohms would be about 6 volts. As a rule of thumb you want to keep voltage drop to no more than 10% of the supply voltage. So it you were using 120 volts you are okay at 300 ft with 6 AWG since the drop is only 5% of the supply. If you were at 240 volts it would be even better since the drop would be 2.5%.

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See NEC 310.16

ie, using THHN wire then 600 MCM copper wire will do

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To answer this question a voltage has to be stated.

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Q: What wire size is needed for 50 amp service at 300 ft?
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What size wire is needed for a 200 amp residential service panel?

A 350 MCM copper wire with an insulation factor of 90 degrees C is rated at 325 amps. If the question is referring to maintaining a load of 300 amps then you have to up size the wire size because the conductor is only allowed to be loaded to 80%. A 500MCM copper wire with an insulation factor of 90 degrees C is rated at 395 amps x 80% = 316 amps.


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The first thing we have to do is clarify between the two items. 120 volt wire rating is an insulation rating of the wire. Like wire with ratings of 300 volts, 600 volts and 1000 volts these are the highest allowable voltages that can be applied. A wire that is rated for 300 volts is good for 120 volts, 240 volts and 277 volts. At test research facilities, equipment is tested to destruction. The label that is given to wire as a result of the tests is the highest safest voltages that can be applied to that particular wire. So when you see a wire that has a label stating that it is rated for 300 volts it means that any voltage under and up to 300 volts is safe to apply. The ability of a wire to carry current (amps) is related to the size of the wire. Now, watts is the product of amps x volts. To answer this question, assuming the supply voltage is 110 volts, an amperage needs to be stated as per the formula above.


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