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You have to replace the wire (as you are increasing the current capacity), the outlet, and the breaker. Essentially you have to remove the old circuit and put in a new one. You can't reuse parts of the old circuit as you are increasing the current capacity and they would be underrated.

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Q: How do you upgrade from 120V 15A to 120V 20A or from 240V 20A to 240V 30A?
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