If you split the plug for a given appliance and plugged each part into two different outlets on separate circuit breakers, the following scenarios could occur:
Normal Operation: If the two outlets are on separate phases in the electrical system (assuming a split-phase system like in North America), and the appliance's electrical load is relatively balanced between the two circuits, it might operate normally without any issues. However, this scenario is unlikely unless you intentionally configure the electrical system this way.
Tripped Circuit Breakers: More commonly, each outlet is likely connected to a different circuit breaker that is part of the same phase in the electrical system. In this case, the circuit breakers are likely to trip almost immediately because of an imbalance in electrical load. The total current drawn by the appliance will exceed the rating of one of the circuit breakers, causing it to trip to protect the circuit from overload.
Uneven Load: If one of the circuit breakers trips before the other, the appliance's load will be shifted to the remaining outlet. This could lead to an uneven distribution of electrical load, and the second circuit breaker might also trip due to the excess current.
Fire Hazard: In some cases, if one of the outlets or circuit breakers is faulty or if the wiring is not designed to handle the combined load of the appliance, it could result in overheating and a potential fire hazard.
In general, splitting the plug of an appliance and plugging it into two different outlets on separate circuit breakers is not a recommended practice. It can create an unsafe and potentially hazardous situation. If you need more power for an appliance, it's best to consult a qualified electrician to assess the situation and make appropriate modifications to the electrical system to ensure safety and compliance with local electrical codes.