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.
Thanks.
Best Answer
If your area uses the National Electrical Code then it has an exception for older installations that allows you to continue to use a 3 prong (NEMA 10-30) receptacle.
The appliance can usually be fitted with a 3 prong plug and the ground and neutrals are bonded in the appliance not at the receptacle.
Get yourself a 3 prong appliance whip from the box store and replace the cord on your oven. Look for information online your model and how to bond the ground and neutral inside the connection box.
Good Luck!