you say one run at 250 feet then add 200 more feet down the well if so the total run is 450 feet

my main condseration you will run some issue with voltage drop with this length of wire here

i came up the caluation it will reqired # 3 yeah #3 copper wire for full run with the vd of 6.2 volt drop or 2.6 % vd but with your figures i will post it here

with your figures with #6 wires it will have 5.2% VD or 12.4 volt drop

all the figures are based on 240 volt supply and useing the THHN/THWN wires for other type wires it can change the figures all the figures are based on 75°C termation rating

and i think you are very right on borderline with the VD

Merci, Marc

Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)