Have a shed with current 120v/15a service. I want to go to 120v/20a using 12/2. My understanding is, black and white wires go together and then you have the (bare) ground.
My current recepticles are 115v ( I think) two poles on each side. I believe the ground is pigtailed.
My questions, given I only have two wires to connect..
It sounds like you are connecting 220 to the shed. If all you want is a 20 amp circuit 115 volts then get a 20 amp single pole Cutler Hammer breaker and get rid of the double pole. Connect the ground and white to the main panel ground bar and the black to the new breaker. You can keep the receptacles 15 amp or change to a 20 amp outlet. Only the first outlet has to have a GFCI. (20 amp or 15 if that is what you want)/. Connect the black to the brass line screw and the white to the silver line screw. Then run a 12-2 from the load side to other outlets. Black to brass and white to silver and bare/green to ground screw.
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