3 wire plug on a new electric range

Status
Not open for further replies.
Electron_Sam78

Electron_Sam78

Senior Member
Location
Palm Bay, FL
I had someone ask me about a new electric range today. They said that it came with a 3 prong plug. They were wondering what to do since they had a four wire receptacle. I didn't think new appliances came with 3 prongs plugs anymore especially ranges. Are ranges like dryers where they can have a bonding strap between the grounding and the grounded terminals to accomodate a 3-wire plug? It's been a while since I had to mess with an electric range.
 
Take a look here:

250.140 Frames of Ranges and Clothes Dryers.
Frames of electric ranges, wall-mounted ovens, counter-mounted cooking units, clothes dryers, and outlet or junction boxes that are part of the circuit for these appliances shall be connected to the equipment grounding conductor in the manner specified by 250.134 or 250.138.
Exception: For existing branch-circuit installations only where an equipment grounding conductor is not present in the outlet or junction box, the frames of electric ranges, wall-mounted ovens, counter-mounted cooking units, clothes dryers, and outlet or junction boxes that are part of the circuit for these appliances shall be permitted to be connected to the grounded circuit conductor if all the following conditions are met.
(1) The supply circuit is 120/240-volt, single-phase, 3-wire; or 208Y/120-volt derived from a 3-phase, 4-wire, wye-connected system.
(2) The grounded conductor is not smaller than 10 AWG copper or 8 AWG aluminum.
(3) The grounded conductor is insulated, or the grounded conductor is uninsulated and part of a Type SE service-entrance cable and the branch circuit originates at the service equipment.
(4) Grounding contacts of receptacles furnished as part of the equipment are bonded to the equipment.
Click to expand...
 
480sparky said:
Replace the cord with a 4-wire. While you're doing that, remove the bonding jumper between the neutral and frame.
Click to expand...

That was my advice too. I just wasn't sure why they would sell a 3-wire cord with the new appliance. I also wasn't sure if the range had the same bonding strap like the dryers do. I've worked with more dryers than ranges and it's been a while for both.
 
Electron_Sam78 said:
That was my advice too. I just wasn't sure why they would sell a 3-wire cord with the new appliance. I also wasn't sure if the range had the same bonding strap like the dryers do. I've worked with more dryers than ranges and it's been a while for both.
Click to expand...

If I buy a new range for my house it had better come with a 3 wire cord. I'm not about to rewire the house. They are supposed to ask which cord you need.
 
And if you want a 4 wire cord don't let them install it. I would bet they will not disconnect the jumper from neutral to ground. :smile:
 
Not to throw cold water on your low voltage initiative, but we design some of the Jimmy John's and the low voltage wiring (at least the one's we do for them) is by the Owner's Vendor, E.C. supplies only the conduit and boxes. It should state this on the drawings however. Might want to verify this before you put too much effort into it.
 
ronmath said:
Not to throw cold water on your low voltage initiative, but we design some of the Jimmy John's and the low voltage wiring (at least the one's we do for them) is by the Owner's Vendor, E.C. supplies only the conduit and boxes. It should state this on the drawings however. Might want to verify this before you put too much effort into it.
Click to expand...


Wrong thread?

http://forums.mikeholt.com/showthread.php?t=111441
 
480sparky said:
Replace the cord with a 4-wire. While you're doing that, remove the bonding jumper between the neutral and frame.
Click to expand...
Exactamundo. The present circuit dictates how the new machine is to be connected.

Just save the cord and jumper in case the dryer is ever relocated to a 3-wire circuit.
 
Status
Not open for further replies.
Top