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The run is around 85 feet. Would #10-3 wire be ok to use or would I need to go with #8-3?

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10/3 will be more than fine

You won't start hitting voltage drop issues (upwards of 3%) on a 10AWG dryer circuit (~21A at 240V, using the Article 220 standard dryer load of 5kVA) until you hit about 160' of distance -- feel free to plug the numbers into your favorite voltage drop calculator and see what comes out.

  • Wow that is a long dryer run, I fully agree with 3phase as we have a horse blanket dryer in our barn 5kva, #10 copper is all we have and it only has about 2v drop when running but only about 120' from the panel. – Ed Beal Sep 16 '18 at 20:27
  • Im only running around 85' but the guy at the store said that could only go 75' and i would need #8 and i didnt think he was right so just making sure. – john Sep 16 '18 at 21:18
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    @john welcome to home improvement store advice. I've spoken to managers at real electrical supply houses - they say they recruit at big-box stores by playing dumb customers. When a clerk knows something, he hires them away. Guess who that leaves. Anyway, your guy was smarter than most, there's some reasonableness in that 75' number, that would apply to a 120V circuit that is drawing the 100% full breaker-trip ampacity e.g. actual 20A on a 20A circuit. Which is something you rarely do. – Harper - Reinstate Monica Sep 16 '18 at 23:43
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What ThreePhaseEel said. Keep in mind your dryer current draw is 23 amps That's true for almost every dryer made, since they are all aiming to be slightly underneath the 80% derate on a 30A circuit.

So be sure to use 23A when plugging into the Voltage Drop Calc.

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