Need some clarification on electircal oven/microwave combo install

devslashnull

I'm planning on buying a 30" MMW9730A Maytag oven microwave combo. The install instructions seem generic about the amperage and wiring stating it's a 240vac 5520w at 30.5amps. Currently I have a 3 wire (with a 4th ground) 10g wire going to 2 phase 30amp breakers. If my math is correct 5520w shouldn't be pulling more than 24amps which would fall in the %80 range. So why do they state it's pulling 30.5 amps? I've currently have the walls out and wondering if I need to spend the money to get this upgraded to 8g/40amp breakers or will the current wiring work?

joed

Does the unit have a plug? If it does then you need to match the circuit to the plug installed on the unit.

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devslashnull

There was a plug on it, I removed it to inspect the wires, the instructions for the new oven calls for it to be wired to a j-box.