I just built a shed. I have extra 10 Awg wire given to me. I would like to run 3 wires of 10 gauge to my shed (all i have left) and use a 30 amp breaker. Do i need to put a 30 amp service in to downgrade to 20 amp outlets or should i just use a 20 amp breaker, run the 10 gauge wire and then wire in my lights and outlets? I also was wondering if i need to put wire in conduit where it runs thru basement? Im putting it in conduit underground but didnt want to in my basement if its not necessary. Thanks for any help.