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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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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