Hi, I am interested in seeing what I would have to do to comply with the NEC recommendation to have no more than 3% voltage drop for the farthest outlet on a branch circuit and no more than 5% drop for the combined feeder and branch circuit. The installation would be a 50A sub panel located at ~75-85' (worst case scenario of 85') from the main panel in an attic. I was hoping that 6/3 copper NM-B would suffice to connect the main to the sub panel. The question is whether I should use 120V or 240V in the calculator to estimate the drop from the main to the sub? If I were running 240V circuits in the branch circuit, it makes perfect sense to use 240V when estimating the feeder and branch drop. If I were running 120V circuits in the branch circuit, it seems to make more sense to use 120V when estimating the branch AND feeder drops, as 120V is using only one of the legs at a time. Am I thinking about this correctly? If you have a good reference to explain this to me, I would appreciate it.

i just wanted to know if this is the correct way to wire, power source is from a generator. [ATTACH]25994[/ATTACH]