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The minimum allowed conductor for 120 volts, 15 amps at 325 feet would be 6 AWG, giving you a 4.8 percent voltage drop (at 18.75 amps, which is the derating for 15 amps being 80 percent of the design load). Five percent is the max allowed in US and Canadian electrical codes (US measured at outlet, Canadian measured at point of use). If you're using 240 volts, the min AWG would be 8 AWG for 3.8 percent drop.

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