tomman58 wrote:
To what level 6%???? Only if you want to do this permanently not for temp. Besides all you folks that figure this stuff in the real world of "just make it work for the weekend" are not from this world.I've seen 150Amps run on #6 for temp in air.
Let's not turn a molehill into a mountain ... the OP has described this as a one time event, for the convenience of his guests. All we know is he has a 5th but we don't know if it's wired for 50 amp main service or just 30, or whether the feed he normally uses at his house to power his rig is 50 or 30. All we know is he wants to temporarily locate his rig 125' from it's normal source feed and for that I'd suggest he run the necessary length of 10 gauge, monitor the source voltage
under load, and if it's above 104 vac then that will suffice for the purpose he has in mind. If he doesn't have sufficient 30 amp / 10 gauge cable (and if necessary a 50/30 dogbone) perhaps he can borrow these items to get him through this brief scenario. No need to make it any more complicated than this. :R