Thank you for your reply. actually I miss the JB. the Q cable is only until the junction then change to #10 THHN to CB. by center feeding i'm getting just below 2%.You can do that. But I don't see what it has to do with a long run. The voltage drop on the Q cable is relatively high for going long distances, and you likely don't want to go super far with it. Like 30ft probably okay, but definitely not 300.