What is the best way to add two NEMA 6-50 outlets to an outbuilding 130' away? I have had a very mixed bag of advice so far! The outlets are needed to run two electric kilns in an outbuilding and need to be usable at the same time without a serious voltage drop, the recommended wire size for up to 100' is #4 each. The main supply breaker panel is outside but the through lugs have already been used to go inside to the main breaker panel a further 30' away. So should I put a sub panel next to the main supply breaker and then use two supplies with #3 cables, or should I try 2-2-2-4 off the main supply breaker (though I don't know how to do that if the through lugs are already used) and put a sub panel in the outbuilding? Also what conduit size should I be looking at for any of the options? Obviously the 2-2-2-4 would give me a Neutral at the building, but is that big enough to run 100amps at 130', and how do I wire it into the main supply breaker with the through lugs used? The twined #3 option doesn't give me a Neutral but it isn't needed in any expansion plans so isn't that important, the outbuilding already has a regular sized supply for lights and 110 receptacles that isn't readily upgrade able. But if I do that what size conduit is allowed for two 50amp outlets and what size Earth needs to be run? Any help would be greatly appreciated.

For a while our addition on our house, the lights would go dim and bright often and now they don't work along with a few recepticals. I was checking the breakers and my non touch tester shows some of the wires coming out had no power. So I had 2, 20 amp breakers side by side and 1 had power and the other one didn't so I switched the wires thinking I would see that the breaker was bad, NOT! It tripped the the main breaker on the side of the house beside the meter. So when I flipped it back on then the panel breaker tripped so I switched them back and left those off but now the lights are working? So leaving the lights on I flipped that main breaker on the house off and back on again and no lights at all. I'm think that main breaker might be the problem with all of it. Then this morning I got up and checked, lights are working again so I went to plug in a 12volt charger for my drill and all the lights went out along with that plug I used but no tripped breakers, 5 minutes later the lights just came back on by themselves and the receptical is hot again? I know the recepticals and lights are on different circuits so it almost has to be something with that main breaker. Any ideas? Banjoman