Hi- I have a PA300 that I have been using for welding shed 40 pipe. The machine has been great so far. I especially like the portability of the machine. I really like the fact that I can have the machine close by as I move throughout the building by adding 8/3 extension cord to the 208V power supply. Can anyone tell me what the length limit is on 8/3 extension cord? Can I damage the welder by using too much extension cord? Would I be better off splitting the distance with lead? On the job I am currently on, I have to run about 250 feet from the power panel to the work on the roof. I would like to avoid bringing in a gas drive if possible. Please advise. Thank you.