I have to feed a subpanel for an underground well. It is 250' from the panel and I have calculated with 27.5A 240V load, I'll need to run a #6 feeder. Here is the problem. The contractor installing the well and pump told me that the actual pump will be 200' underground. So, he is going to have a cord all the way down to the bottom and that is where the motor will be. Do I need to calculate this into the line loss? So a total length of 450'??

Please advise.

Thanks,
Byron