New microwave convection combo wall unit has 4 wires...white, black, red and green. Wall has three wires of white, black and bare copper. Original set up for 22 year old oven was 3 prong 50A 125/250V plug. We need to hardwire and need to know which wires to connect from wall to oven.
Simply put, it won't work. New oven=white is neutral, black and red are power but not on the same "leg", and green is ground. If you use a meter, black and red should give you 208-230 or so volts. Wires from wall=White is neutral, blank is voltage (probably 120 or so volts) and bare copper is ground. The dual voltage plug can be used for either 125 or 250 volts, not both as required by the new oven. Need an new circuit pulled and wire/breaker matched to new oven power requirements.
SOURCE: Replacing a 30 inch wall oven -
a number of solutions for your problem a little smaller better then a little larger, iv seen depending on surrounding cabinetry, either wood fill strips, lexan(plastic) strip added as a filler. depending on what the installation guide recommends for opening , that is all that would be required what you fill if with will be a purely asthetic choice
SOURCE: i just installed an electrolus
Unfortunately, you do not have 220 volt standard house wiring. In fact, I bet if you put a meter on it, you will only have 110 volt. All US standards and codes require the standard 220 Volt wiring (Red and Black - hot; White - Neutral and green is the ground.
Also you need to look into what the oven require for amperage. Not only is that important for the circuit breaker that you install but also the size of the wire required.
I would suggest you read your manual and then run the proper size wire from the circuit breaker panel to the ovens.
If you attempt to operate the ovens on the wire you have installed, your insurance company has not legal obligations to pay for the repair of your house when it burns down.
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