RackMaster Oven Plug
The RackMaster RM2020 and RM24 ovens use a NEMA 6-20P plug (which comes installed on the oven), and will require a 6-20R receptacle. Both are pictured below. You should have an electrician install the receptacle (which may require some new wiring, depending on your situation), and the oven needs to be the only thing on that circuit.
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NEMA 6-20P plug | 6-20R receptacle |