GJ,
I had a similar situation a while back. While I don't have an answer for you, I can tell you this. My situation was a temp generators. We ran 12 4/0 type W per phase from each generator to a termination cabinet to parallel the two generators. All cables were exactly 40ft in length. While load testing the generators with a load bank (a purely resistive load) I took some amp readings on the cables out of curiosity. To my surprise there was a variation of about 50A in while pulling a total of 1000A. Some cables were very close to each other some were quite different. I never could explain why especially in a controlled situation. [Linked Image]