Jim is correct. And there is NOTHING wrong with a 20 amp on a 30 amp circuit. Nothing at all. The breaker on the wall is there to protect the wiring and the house/shop from fire. NOT to protect a motor or an appliance if it happens to draw more current than it should. If this was the case, you would have to size every piece of equipment in your home to exactly what is on the wall as a breaker. If you limit what you can plug into the 20 amp outlet (on the 30 amp breaker) to what is 20 amps or under, you are totally within NEC. If you plug a 30 amp load with a 20 amp plug and 20 amp outlet together, you are looking for issues. Keep your load below the rating on the plugs/outlets and you are FINE
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