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Hooking up new 220 circuit

Doc

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I'm running #6 wire for a 220 circuit for the welder I picked up from Bob.
Told the guy at the electrical store that I needed wire for a 50 amp circuit about 30' from the box.
Also bought the 220 outlet and 50 amp breaker.
As you see in the pic I have a very empty breaker box. Just 4 outlets on one circuit and 3 overhead lights on the other.

I've always read / heard use white for ground. And as you see in the box that is how it was wired by the electrician who put in my service.
But the #6 wire I have only has 3 wires. One black, one white and one bare wire.
I know the bare wire has to be ground, and I told the guy what I was doing but I'm questioning if I have the right wire.47CBBCE0-342B-487B-83E0-55A0AA4A3DA3.jpeg3B0B8DFD-7B96-489C-AEF6-D1DC6EA60242.jpeg
 
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220v uses two wires - one for each 110v leg - the bare wire is the ground/neutral.

black to one terminal on the 220v breaker
white to the other terminal on the 220v breaker
bare to either of the side strips - affectionately known as "ground" and "neutral" - although as you can see,,,, they are electrically bonded 'together'
 
Exactly as I suspected but to be safe I needed that reassurance. Thanks chowder!!!!
 
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