Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
I am installing a double oven. The wires from the oven are red, black, white and a ground. The wires in the junction box are two black and a ground.
All are 220V/240V.
What wire gets connected to what?
You will need to replace the wire from the electrical panel to the junction box. Your new oven requires a neutral (white) wire to power some 120v electronics in it. Your existing wiring doesn't have that - it just has two hot wires for 240v.
Required, but never shown