Wiring Connections When Replacing an Oven
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How do I connect the bare copper wire from the wall to the oven wires? How to Identify the Oven Wires when Replacing an Oven: Connecting the Electric Wires for an Oven. |
Oven Circuit Wiring
Electrical Question: How do I connect the bare copper wire from the wall to the oven wires?
- I’m replacing a wall oven and microwave in a house built in 1979. The wire from the wall is white,black, bare copper.
- The wire from the new appliance is white,black,red, and bare copper.
- The diagram in the manual shows the black wires connected, the red wires connected and the two whites and the ground wire from the appliance connected under the screw connecting the junction box to the wall.
- My question is whether I am connecting the bare copper wire from the wall to the red wire of the appliance as it would seem from the diagram.
This electrical wiring question came from: Stephen of Spring, Texas.
Additional Comments: Fairly easy to navigate with tons of information.
Dave’s Reply:
Thanks for your electrical wiring question Stephen.
Connecting the Wires for an Oven
Skill Level: Intermediate to Advanced – Best performed by a Licensed Electrician.
Tools Required: Basic Electricians Pouch Hand Tools, electric drill, auger bits and extension cord.
Estimated Time: Depends on personal level experience, ability to work with tools and install electrical circuit wiring.
Precaution: Identify the panel circuit, turn it OFF and Tag it with a Note before working with the wiring.
Notice: Installing additional circuit wiring should be done according to local and national electrical codes with a permit and be inspected.
How to Identify Oven Wiring for a Replacement Oven
- In many homes that are built around the same age as this one the electrical wiring mat not have been identified as it is now required.
- Many 240 volt circuits were installed without the a separate neutral wire because it was not required at that time.
- The 240 volt circuit cable was typically a 2-wire with a ground which was a black, white and bare ground as described in this question.
- The white wire of this circuit is most likely the second hot of 120 volts, not a neutral so it should not be bonded with the ground wire.
- The existing circuit wiring may be positively identified by using a voltage tester which should reveal 240 volts between the black wire and the white wire, which in this case the white wire of the oven circuit should be identified with black or red electrical tape or permanent marker which is now required by the NEC Electrical Code. The following information describes detailed wiring for a new replacement oven.
More about Electrical Wiring for an Oven
- Kitchen Oven Wiring
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Wiring Options for a Kitchen Oven
- Fully Described Kitchen Electric Oven Installation with a typical 220 Volt electric circuit. You may find yourself with either a 3-wire or 4-wire electric oven. Lets look at how the electric oven is wired and the possible solutions if your circuit does not seem to the same.
- 220 Volt Wiring Diagram
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Wiring 220 Volt Electrical Outlet
- Home electrical wiring includes 110 volt outlets and 220 volt outlets and receptacles which are common place in every home. See how electrical outlets for the home are wired.
- Electrical Grounding
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Electrical Grounding Methods and Requirements
- Listing of electrical codes for grounding with examples of electrical grounding codes for home electrical wiring.
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Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.
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Due to the expense and differential failure rates, I am replacing my existing cabinet mounted wall-oven/microwave combo unit with two separate units (a single oven and a stand-alone microwave) in the same space. The problem I’ve discovered is that the old oven provided its own 120v power supply to the microwave using a standard 3-prong receptacle. The new oven does not and there is no 120v outlet or wiring in the cabinet space. Since the old microwave/oven combo shared the single 220v, 40amp 4-wire circuit despite electrical codes requiring a dedicated breaker for the oven, I am confused as to whether or not I can tie-in to the existing oven circuit to provide a standard 120v outlet for the microwave as a matter of code compliance. Also, I am not certain as to how I would tie-in if it did comply. Thanks, in advance, for any help you can provide.
Hi Chris,
When installing separate units as you have described, the new oven and the new microwave will require separate dedicated circuits that provide their own level of circuit protection. The old oven provided internal fused circuit protection of lower amperage for the outlet specifically for the microwave component, which is a common practice that is code compliant. Unfortunately the new oven does not have that feature, or the two units are not sold as a set. Aside from installing an additional circuit for the new microwave, one option would be locate two units that are sold as a set that do have the same setup as the old oven.
Enjoy your new ovens!
Dave
Thank you, Dave. This is what I suspected and after looking at the old unit, I can see that the oven’s power supply for the microwave has is protected by a 20amp fuse. Unfortunately, for me, I already have purchased and have taken delivery of a new wall-oven unit and microwave so it will be cheaper and easier to find a way to tie into the common kitchen GFCI circuit… maybe pull a new line in from the breaker box. In any case, it sounds like a local electrician will be getting another small job.
Again, thanks for your quick response, and I hope this helps some of your future visitors.
I have a Kenmore Model C970-47121-3 built in oven. The hookup cable has red, black, white, ground, and a yellow wire. Where does the yellow wire hook up to? I do not have any a manual for it. The yellow wire goes back to the oven light switch.
Thanks
Hi Wayne,
My search for a wiring diagram for this oven returned little that was useful. I will post this for all to see and maybe we can get more information.
Dave