Installing Electric Oven

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  #1  
Old 05-31-07, 06:49 AM
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Installing Electric Oven

Hello,

I am doing some work on my kitchen and have questions related to adding an outlet for a new electric stove.

Curently have and getting rid of:
Cooktop - 30 amp circuit
Double Oven - 50 amp circuit

Want to install an electric oven which based on stove documention requires a 40 amp circuit.

Questions:
1. Can I use the 50 amp circuit and simply replace the breaker at the box with a 40 amp breaker?

2. I have done simple electrical work on 120 (replacing outlets, lights, etc), but have not done any work with 240.
I think I should be able to handle installing the outlet for the oven, the 240 just puts me off a little. The cable for the
50 amp has black, red, white and then a bare metal piece that I am guessing is a ground wire. It was attached to a screw
in the junction box that the old double oven fed from. I am used to the ground wire being copper, this one is a silver color and
appears to be aluminum if I had to guess. Will the installation of the oulet for the stove be as straighforward as a normal 20 amp outlet?


Thanks for any advice,
Paul
 
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  #2  
Old 05-31-07, 07:04 AM
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1.) Yes.

2.) Yes, if you carefully follow the installation instructions. The manual will probably provide two different sets of instructions, one for a 3-wire feed and one for a 4-wire feed. Make sure you follow the 4-wire feed instructions. There will be several differences. Look at the cut ends of that silver wire to see if it's really tinned copper.
 
  #3  
Old 05-31-07, 07:07 PM
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Couple more questions

John,

I cannot tell that the silver wire is thinned copper, it is very flat and when I snipped a piece off, I do not see the expected copper color.

Just to clarify a few more things. I have bx cable with the two hot wires (red and black) and the neutral. The wires appear to be 6-gauge. There is also the thin wire (bonding wire?).

Questions:

1. In all the books I have looked at the grounding wire is the same gauge as the other wires. The bonding wire is very thin. Is the bonding wire, the grounding wire?

2. Do I need a 3 or 4 wire range outlet? I guess another way of asking if I use the bonding wire to connect to the grounder connection on the 4 wire outlet or if I should use the 3 wire outlet.

3. One book I read said "Though some codes allow a 40-amp circuit for a 50-amp range, many electricians prefer a 50-amp circuit so that the ranage will be protected when all the burners are on at the same time". So does this mean I should keep the circuit at 50 amp instead of changing the breaker to 40 like the oven document said? The document did have an asterict next to this which pointed to a section that said "Note: Check local codes for required breaker size."

Thanks for the help.
Paul
 
  #4  
Old 06-01-07, 08:15 AM
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Location: Near Lansing, Michigan
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1. When installed correctly, the bonding strip works in conjunction with the metal cable sheath and metal junction box to provide a ground. BX must be terminated at a metal junction box with a BX connector. When you install the receptacle, you should run a #10 copper ground wire from a screw tapped in the metal box to the grounding lug on the receptacle.

2. You need a 4-wire "Range" NEMA 14-50R receptacle.

3. If the oven manual calls for a 40A breaker, use a 40A breaker.
 
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