I am replacing an old electric double oven with two new separate ovens. The first oven requires a hard wired 220 V, 30 amp line and the second oven (microwave/convection) requires a dedicated standard 120 V, 20 amp outlet. Currently I have a junction box in back of the stove cavity which is supplied with a dedicated 220 V, 80 amp circuit. I plan on hard wiring the first 220 V oven. My question is since I have an 80 amp circuit and only need 30 amp for the first oven, can I tap one leg of this circuit at the junction box to supply a newly installed 120 V, 20 amp outlet, which would be dedicated to my second oven?

 

Are you sure that's an 80A circuit or do you mean a double-pole 40A? What type and how many wires do you have? What size is the breaker?

 

Two 40 amp ganged breakers

 

You would need to change to a 30a two pole breaker. If the new oven is truly 240v not 120/240v either a 3-wire circuit or a 4-wire circuit will work assuming you have a bare or green ground wire. If it is 120/240v you will need a 4-wire circuit. You will need to run a new dedicated 20a 120v circuit for this. A standard receptacle can not be used on a 30a circuit so for that reason and others you can't connect the receptacle to one leg of the 240v circuit.