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Old 02-28-2010, 12:26 PM   #1
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Voltage Drop - Sub Panel

I am going to be working on a project where I would like to put in a 100 AMP sub panel in an out building. I have a long run so I need to take voltage drop into consideration (185 ft.). When I look at voltage drop calculators, one of the variables is always volts. I would like to clear up a spot of confusion for me so I do not choose the wrong size wire for the run. The panel would have 240v capability, but the circuits from the panel may be 120v breakers or 240v 2 post breakers. So to calculate voltage drop between my main panel and my new subpanel, do I use 120v or 240v for the calculation?

Thank you in advance.


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Old 02-28-2010, 12:45 PM   #2
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Voltage Drop - Sub Panel

Use 240 volt fot the calculations.


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Old 02-28-2010, 07:23 PM   #3
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Voltage Drop - Sub Panel

For my 100 amp sub in my barn, which I think was just under 200', I ran 2-2-2-6.
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