20 amp/220 v outlet

Talman48

I live in a Chicago bungalow, built in 1926. The electrical service is grounded via a water pipe. When installing a 20amp 220v outlet, there are two brass terminals and a green ground. Should the the green grounding terminal be wired to the neutral bar, or grounded to the box. If I were to use a 20 amp 110v outlet there would be a brass and a silver terminal, as well as a green ground. Why is there no neutral terminal on the 220v outlet

Thanks

Speedy Petey

If this is the main panel then the neutral and ground bars are the same thing. You can connect to either.
If this is a sub-panel then the ground goes to the ground bar.

There is no neutral because there is NO neutral on a 220 volt circuit, simple as that. Two hots and ground.

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