Electric supply questions for current/new range

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  #1  
Old 01-06-05, 06:27 PM
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Electric supply questions for current/new range

I'm replacing an electric slide in range, and will probably have a pro do it, but I'd like to be informed and have a few questions. The house was built in '77 and I'm guessing it's the original 3 wire outlet. The range I'm buying can be wired in 3 or 4 wire mode. Is it possible and/or preferable to have the 3 wire system upgraded to a 4 wire?

My current range has the following 3 lines on a label:
3 wire * 120/208 - 240 Volts
10.6 Kw @ 120/208
14.1 Kw @ 120/240

Does this mean the range operates in 2 volt modes, 208 and 240, or it just needs anywhere between 208 and 240? For the 120 part, is there circuitry inside the range that just uses one of the phases for 120 volts, like maybe the electric clock?

I've worked on 220v/20 amp outlets that my air handlers are plugged into. Is the range outlet the same idea, 2 diff. phase hots and ground, but at 50 amps? Thanks!!
 
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  #2  
Old 01-06-05, 06:58 PM
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Yes...the stove can be hooked up from 208-240 with no probs. As for the 120...that's for the little things like the clock...lights.
 
  #3  
Old 01-06-05, 09:15 PM
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Code allows it to be connected to the 3-wire circuit. It would be better to upgrade it to a 4-wire circuit if you can practically do so, but it is not required.

The stove can be connected to 208 or 240, but most homes only have 240. 208 is derived from 3-phase systems common in industrial and commercial buildings.

Yes, all 240-volt circuits in North America use the same basic idea.
 
  #4  
Old 01-07-05, 08:04 AM
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Cool, thanks for the replies, I think I'm good to go on this. btw, what is that 4th wire for?
 
  #5  
Old 01-08-05, 12:01 PM
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The four wires are hot, hot, neutral, and grounding. A 3-wire setup shared the neutral and grounding, which is not as safe. It was allowed beginning with WWII to save metal for the war, and not revoked until 1996.
 
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