@Len351,
Right. Wire is wire and doesn't care what voltage you put on it (unless you exceed the insulation rating which is not a concern here). Watch out for the breaker. A normal house has +120V, -120V and ground coming into it. (+ and - are relative terms since this is AC current. It means they are completely out of phase with each other.) Half of the house is wired +120V to ground. Half is wired -120V to ground. The 240V lines are wired +120V to -120V. You need to make sure you wire your new breaker correctly, ideally the same way other breakers on the same side of the box are wired. When it is all connected and turned on, use your volt meter to verify you have 120v at the outlet.
This should go without saying but just to be sure, the house power should be off when you are wiring breakers and you should either lock out the panel or have direct control of the master breaker.