I am in the middle of a kitchen remodel -- Original plans called for a single combo cooktop and oven (i.e. a range). I needed a 40 Amp circuit but had 6ga wire left over from the run to the HVAC so I ran this -- which means I can pull 60 Amps, if needed
So as things go we are changing the plans a bit and now we are looking at a separate cooktop and wall oven. NEC (Sec 220.19) talks about this and the math works out that I can consider the two units as one unit and even though the Oven (needing 30Amp circuit) and the cooktop (needing a 40Amp circuit) should do fine at 43 Amp -- lets say 50, which the 6ga wire will handle just fine.
Ok -- so the question is how to wire the two units to the one branch circuit ? I have heard that each load connected to a 240v line needs its own run back to the circuit panel -- but I cannot find the source of this 'rumor' -- in this case I want to run the two units off the same branch circuit
I figure there are two ways to go, one would be to simply wire them in parallel, the other would be so install a small sub panel (50 Amp) in the cabinet below the oven and then install two breakers, one to each appliance.
I believe this would be a common situation in kitchen remodels and as such there is a standard way to handle it