On Aug 5, 6:31*am, Phisherman wrote:
With the circuit OFF, look inside the outlet box and see if there is a
ground wire for the green wire. *If so, replace the 220 outlet with a
4-conductor outlet. * There should be a diagram that labels the wires.
The green wire is (should be) the ground.

About F-ing time someone with some common sense posted a reply to
this...

The OP recanted and said it's a junction box, not a "plug." It's
probably a cooktop and not a range, too.

The junction box is likely metal, and likely grounded with a fourth
wire. Attach the green wire to the ground screw inside the junction
box, nut and tape the other three, and get to cooking something
already!