Okay since Im NOT THERE and have to make several guesses and am unsure what you mean by " It only has one 2+ground wire coming into the box" NO WARRANTY ON MY ANSWERS
IF?????? The "box" has two insulated wires (bigger gauge like 8 or 6 etc) and one bare/green wire my best GUESS is it used to supply 240 volts to a stove (Depends on wire size also??) Iffffffff thats the case it used to be wired to a 2 pole 240 volt breaker NOT a single pole and the voltage would read 240 line to line or 120 from either line to the bare/green ground.
Old 240 volt stoves used 3 wire feeds, 2 hots and 1 bare/green equipment ground. ITS NOT CORRECT TO USE THE EQUIPMENT GROUND AS A NEUTRAL RETURN (i.e. 120 volts line to ground) although that took place in some old stoves
NOWWWWWWWWW if those 3? wires are now instead connected, 1 to a 120 volt single pole breaker (or only one side of a 2 pole breaker) and 1 was NOT connected, and 1 is to the equipment ground buss....................You would measure 120 volts across the wire to the breaker and the other bare/green equipment ground..........0 volts across the unconnected wire to any of the others
Just trace out the wires and see where they are connected in the electrical panel.....If ones to a single pole breaker (or only one side of a 2 pole breaker) and the other to the equipment ground buss, you measure 120 volts across those 2 butttttttttttttt the bare/green equipment wire IS NOT SUPPOSED TO BE USED AS THE NEUTRAL.
If you wanna use those wires to feed 120 volts, Id wire the black to a single pole breaker, usually white to the Neutral Buss,,,,bare/green to the equipment ground buss. In some panels theres only one buss where Neutrals and Grounds BOTH wire.
If you wanna use those 3 wires to feed a 240 volt circuit, wire one insulated wire to one side of a 2 pole breaker, the other insulated wire to the other pole on a 2 pole breaker, the bare/green to the equipment ground buss
NOTE a metallic junction or outlet box also needs bonded to the equipenmt ground ya know.
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