We purchased a Miele Oven (H6880BP) which has a NEMA 14-30 plug standard. The manual specifies 120/240V, 30A, 60Hz but does not have any instructions for a three wire connection.
Our supply is 10 gauge copper wire with three conductors (one is bare ground wire). It is 240V across the two hot legs and is a 30A double pole breaker.
It seems like I have the right power requirements, but am not sure how to connect the oven. I don't think I should use a pigtail to connect ground and neutral so what are my options? Running new four conductor cable would require ripping out plenty of drywall and cabinets. No go.