Voltage drop for branch circuits

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mak134

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Is there a way to calculate total voltage drop for a branch circuit with multiple wire sizes? IE if I run #8's for 150 feet on a 120 volt circuit how far can I branch off with #12's and still maintain a less than 3% drop?
 

charlie b

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Location
Lockport, IL
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Retired Electrical Engineer
You can do the calculation in steps. Sometimes a spreadsheet helps with this process. I have done similar things for marinas, when the number of slips yet to be fed gets smaller and smaller, the further you go down the pier. So the wire size can get smaller as well. I have also done this for site lighting, when the number of lights yet to be fed gets smaller and smaller, the further you get from the panel.
 
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