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All the responses jarred my memory. it's been a long time since I wired a 220v circuit.

I remembered: I've wired these cicuits with all four wires! now I have an option for only three! But I...

So the neutral is not used at all?

I'm just making sure, that's all.

I am running a circuit for a tanning bed requiring a 220v 20amp dedicated circuit.

I understand the red and black go on the gold connectors, but what goes on the green one? is that for a ground...