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Sub panel voltage drop

G

Gabriel848

New User
Location
Central Valley
Occupation
Solar Contractor
I’m installing a sub panel approximately 95’ away from MSP. Single phase . Sub will need 70A. Sub will have 5 feeders drawing possibly 50-60A total at any driven time. My calculations show that I would need 4AWG(copper) to account for voltage drop. Am I correct or should I use 3awg? any assistance would be greatly appreciated
 
J

jaggedben

Senior Member
Location
Northern California
Occupation
Solar and Energy Storage Installer
What are your calculations? I don't see too many people upsize for voltage drop at 95ft. But to answer your question definitively we need more information, starting with what level of voltage drop is acceptable in your circumstance. Should we assume California Energy Code limit of 5% for feeder and branch circuit? In that case we also need to know the length, wire size and amps, of the branch circuits. Add together the voltage drop of the branch circuit and the feeder to see if compliant.
 
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