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I would like to run an underground wire from my driveshed to my garage to run a 4800 watt construction heater. I think they draw 20-25 amps. I don't have 220 in the garage. The distance is 200 ft. Is 10/2 UF wire heavy enough for that distance?

  • thanks for the replies , just to clarify I already have 110 in the garage , lights and receptacles . New line is just for heater – Ron Dec 7 '15 at 23:30
  • What's the make and model of the heater? Is it hardwired, or cord connected? – Tester101 Dec 8 '15 at 1:30
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4800w @ 220V 21.81A. 10AWG is two small. 8 awg is right on the edge using 3% max voltage drop (uglys page 50) if you want to run any lights you should be using 6AWG for that long of a run.

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    Ed has this right. Although, your residential voltage should be ~240 volts, still, his calculation for #8 wire is correct. Here is a handy calculator for voltage drop. southwire.com/support/voltage-drop-calculator.htm entering your parameters and a 3% drop yields #8 wire. – ArchonOSX Dec 7 '15 at 23:34
  • What size breaker should be used? – Tester101 Dec 7 '15 at 23:48
  • @Tester101 - wouldn't that depend on what the heater nameplate or instruction manual specifies (if hardwired), or the receptacle type if it's plug in? If it's a NEMA 6-30, that would imply a 30A breaker. – Johnny Dec 8 '15 at 0:14
  • I like the calculator link ArchonOSX provided. way faster than looking up and calculating... :) – Ed Beal Dec 8 '15 at 0:25
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no. that is not heavy enough wire for what you want to do.

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  • What would the correct size be? – Tester101 Dec 7 '15 at 23:43
  • 30A would be the next larger size since it draws +21A – Ed Beal Dec 8 '15 at 0:20

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