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So I bought a camper to put on my property and I'm wonder how to go about getting power to it. I found a RV plug box with a 30 amp breaker in it and was wondering what size wire ill need to run to get a good flow at 300+ft. Do I have to go with #6 copper or #2 aluminum or can I go with thinner wire?

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  • Without looking at voltage drop calculations, #6 copper is a good guess. You need to look at cost per foot to see which cable size is the best price. #2 Al is common and usually a good price, but you might only need #4 or even #6 Al. #2 will be iffy to fit a 30 amp breaker without pigtailling to a smaller wire. Voltage drop should be around 3 to 5%.
    – crip659
    Commented Jul 6 at 18:41
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    This voltage drop calculator suggests that a 120VAC 30A circuit 300 feet long warrants 2 AWG Cu or 2/0 AWG Al to remain below a 3% voltage drop.
    – HABO
    Commented Jul 6 at 18:43
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    Also be sure to include good lightning protection: a 300 ft run of wire, even underground, can pick up a large induced current from a nearby strike, not even direct.
    – DrMoishe Pippik
    Commented Jul 6 at 18:44
  • what's a good flow?
    – jsotola
    Commented Jul 7 at 14:15
  • @jsotola I mean I just don't want to be tripping the breaker in the house. I've never in my life done electricity. I'm an apprentice carpenter. So this project is something new to me and I just don't want to do it wrong and burn my new camper or house down.
    – Ivan Taylor
    Commented Jul 7 at 22:23

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