30 AMP home wiring Question

I'm not a sparky but I've done a bunch of wiring with the guidance of a licensed sparky. Like mentioned... use a 2 pole 40A breaker so you don't overload the 8ga wire. You can still use the 50A rv connectors but it will have a 40A limit and hopefully the 120 loads are divided up in the panel so you can run everything you want w/o overloading either phase. If not... switch the loads/breakers so the loads you want to use are divided evenly between the two phases/120 bus bars. Just don't jury-rig plugs/receptacles and plug a 30A rv into that 40a circuit - there would definitely be the potential of burning things up! Phase tape is fine, the sparkys at work (and I) use it daily. Keep in mind, a ground can never be a conductor - it's to trip the breaker in case there is a fault to the equipment chassis and it keeps you from becoming the current path to ground. Neutrals and grounds go to the same ground bar in a main panel but sub panels have to have a "floating" neutral bar - no continuity between the neutral bar and the sub panel case. Make sure your breakers have the HACR (heating, air conditioning, refrigeration) rating if you want to run the ACs. They will take the higher inrush current from inductive loads. Craig