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08-29-2012, 08:15 AM   #1
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## Another Sub panel question

So I've read enough forum topics to make my brain melt but still I'm a little unsure as to what wire I need so here's what I have:

200A main panel will be feeding my barn that is 175ft away, in the barn I plan on installing lights and 2 outlets. So I planned on installing a sub panel with 2 20A breakers one for the lights and one for the 2 outlets. Will #8 THWN work? Thanks in advance

08-29-2012, 10:28 AM   #2
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Use this calculator to determine the size wire you need for your run. You must pick your current requirement (panel). http://www.southwire.com/support/vol...calculator.htm

08-29-2012, 10:48 AM   #3
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## yeap

Thanks J. V. I was looking for a calculator that made it easy for the DIY'er

08-29-2012, 01:02 PM   #4
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Quote:
 Originally Posted by combs&co Thanks J. V. I was looking for a calculator that made it easy for the DIY'er
Combs,

It cant be made simpler because you have to make the following decisions:

1. Do you actually need a sub-panel or would a single 20A circuit or a 20A MWBC do the job
2. If you do a subpanel, what size. If in doubt, upsize to allow for future growth. Remember a sub-panel has to have its own grounding system in addition to the ground provided from the line to the main panel.
3. Voltage drop. at 175 feet voltage drop enters into play. Probably upsize at least 2. So for example, for the 20 amp MWBC, you would use at least 10 AWG, not 12.

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