There are a number of possible solutions. However, you have an expectation here of needing on the order of 30A total current, presumably at 120V. Code is generally written so that anyone encountering a particular item (e.g., a 20A receptacle) will be able to expect specific safety rules to be followed. the next owner (or even just a visitor) may not realize the limitations and try to plug in too much stuff at one time and end up with a fire. In case you are wondering, in addition to the "device" problem, there is also the idea that while you know exactly what is going on and what can be plugged in where, etc. But generally speaking that is the main exception and you can't mix 20A and 30A. Similarly, a typical device designed for a 15A circuit can be plugged into a 20A receptacle. Note that this "always match" rule does have some exceptions regarding 15A & 20A - a 20A circuit (breaker with 12 AWG wire) can have 15A and/or 20A receptacles. A device designed for a 15A circuit could have a malfunction that caused it to pull 25A of current expecting that a breaker trip would stop it before it caught fire, but on a 30A breaker that doesn't happen. are rated based on the amount of power they normally use and what they can handle when things go wrong. You can't use a 15A or 20A receptacle on a 30A breaker because if you had an overloaded device (not planned - malfunctioning) that pulled 30A, it would melt the receptacle but the breaker wouldn't trip to stop it.
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