Fedup: There is an NEC requirement for VD; total of 5% (3% feeder; 2% branch) Not the exact wording, but the #'s are correct. BTW, there is a nifty calculator available (over on the left border of this page) If I get back to the desk later, with the calc, I'll run your numbers thru. We just did 2-25 HP pumps, 1675' run, 480 volt, and installed 4" w/500 mcm Cu. John
