Electric ovens require a lot of power in order to operate. This is why they are powered by a double-pole, 220V circuit. Increasing the voltage reduces the amperage drawn by the oven, ultimately allowing it to work more efficiently. If the electric oven were powered by a simple 120V circuit, your electric bill would be astronomical. This is why there are four wires that get connected to your oven when it is installed.
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Things you need
- Strain relief connector
Remove the cover plate to the wiring junction box located on the lower back side of the electric oven. Here, you should see the terminal block which consists of four terminals -- three in a row and then the grounding terminal located somewhere below them.
Remove the knockout hole on the inside bottom of the wiring junction box.
Loosen the two screws on the strain relief connector and insert the "wings" into the access hole. The wing side should be on the inside of the box, and the section with the screws should be outside of the box.
Guide the wire up through the strain relief connector and into the wiring junction box.
Tighten the screws on the strain relief connector to hold the wire in place securely. Be sure the connector clamps down over the outer sheath of the wire and not over the section of wire where the wires are separated.
Check the ends of the wires to make sure there is enough insulation removed for the wire to sit comfortably in the terminals. If more insulation needs to be removed, use a sharp knife to remove it.
Loosen all of the terminal screws. Then, slide the ground wire under into the terminal designated for it, and secure it in place by tightening the screw back down.
Take the white wire and connect it to the middle terminal.
Take the black wire and connect it to either the left or the right terminal and then connect the red one to the other. It doesn't really matter which, as long as they are connected to the two outside terminals.
Make sure all of the connections are tight, and resecure the cover plate back into position.
Push the electric oven back in place, paying attention that you don't set the oven on top of the wire.
Turn the breaker back on, and turn the electric oven on.
Tips and warnings
- Always turn the breaker off before working on a 220V electric oven.
- Use care when stripping the insulation using a knife.
- Be careful you don't nick any wires, wither with the knife or on the oven's metal exterior, during the installation.