The installation specs for my cooktop read as below:
-Connected Load (kW Rating) @ 240 / 208 Volts = 7.2 / 6.2 kW
-Amps @ 240 / 208 Volts = 35.0 / 35.1 Amps
-Recommended Circuit Breaker – 30 Amps
The circuit I have available is on a 240v 40 amp breaker running 8 AWG wire.
First, it's a little strange that the manufacturer lists a 35 amp draw and recommends a 30 amp breaker. I'm guessing that has something to do with the NEC 220.55 Demand Factors table. But according to the table 1 appliance at 8,000 watts divided by 240v = 33.3 amps. I'm stumped there.
Second, it would seem to me that since the cooktop leads will be hardwired in a junction box, there wouldn't be a plug compatibility issue. Then the only problem might be the gauge of the wiring coming out of the cooktop provided by the manufacturer?
Finally, in a separate manufacturer specs doc lists the "Minimum circuit required" as 30 amp... which makes me think that a 40 amp circuit would be fine even though the other doc "recommends" a 30 amp circuit.