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I need to run 110 volts AC 300' to a subpanel. What size copper wire do I need? Wire will be run in conduit underground.

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    How many amps do you need to carry? – kicken Oct 12 '19 at 16:38
  • Hello, and welcome to Home Improvement. You'll need to give us more details before we could help you. And, you should probably take our tour so you'll know how best to participate here. – Daniel Griscom Oct 12 '19 at 17:28
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    What are you trying to power here? – ThreePhaseEel Oct 12 '19 at 18:53
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    The answer is "None. You use aluminum." Except for very small circuits, or certain cases where a transformer+#12 wire prices out as cheapest. By "small" I mean how much stuff is being powered; this is measured in one of these figures: Amps, Watts, or VA. If you're not sure on that stuff, then a) tie an email to your account, b) log in to a real computer, and c) edit your question to include a good essay-sized 200-500 word discussion of what exactly you intend to power in that location. It is impossible to answer without this data. – Harper - Reinstate Monica Oct 12 '19 at 20:17
  • And if it is to a subpanel, rather than a single circuit (unless it is "subpanel that only powers one circuit and using a subpanel as a shutoff switch, which is OK but overkill), then 240V would use 50% more wire but get you 100% more power/circuits. – manassehkatz-Moving 2 Codidact Oct 13 '19 at 0:44

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