Identifying neutral/hot wire in 240V outlet
I'm in the process of installing an electric wall oven that calls for a 240v feed. There is a 240V outlet exactly where the oven will go, so far so good. After killing the power at the panel I removed the wall cover only to find three wires, two black and one uninsulated ground. My oven's electrical scheme has the neutral and hot wire specifically identified in the wiring diagram. My problem is that I have no idea which one of the two blacks in my wall is which. When I run a multimeter between the two blacks I get 240V. When I run the MM between one black and the ground I get 120V. Does this mean that it doesn't matter which black wire I use for the neutral or hot? If not how do I differentiate between the two?