European Cooktop for use in US split phase
Not sure about what the Code says, but you can pretty much wire ground (or center if no ground available) for ground, one of the split phases (hot) to all L1/L2/L3 together and the other hot for N's.

These appliances don't really use 380/400v between-phases voltages (that's why they support single-phase 220-240 operation).