This is old subject, but still can't figure out why on a new oven ckt, the manufacturer says you can use a 3 or 4 wire ckt. The oven controls must be 120v, which would mean you'd be tying the neutral to the ground at the oven (cause they are 4 wire) and the ground would then be part of the current carrying path back to the panel on a 3 wire ckt. Is this code for new ovens?
The Golden Rule - "The man with the gold makes the rule"
The code used to allow us to install 3 wire range and dyer outlets in certain locations.
which would mean you'd be tying the neutral to the ground at the oven
No the code did not allow that, what they did allow was using the neutral as the grounding means.
You say 'hey thats the same thing'. It's close to the same thing but it requires that the conductor be insulated.
Now the code will not let us install 3 wire range and dryer outlets. But existing ones can remain so when the customer gets a new range they need to buy a power cord that fits the outlet they have and they have to either bond or un-bond the neutral to frame.
Bob Badger Construction & Maintenance Electrician Massachusetts
We recieved a delivery of electric ranges...the order stipulated that the ranges have the cords attached...the ranges have a 4-wire cord attached...the range itself has a the jumper still installed between N-G. These ranges are being installed in new construction.
Who would say is responsible for checking that connection? - The Appliance Co. where they were ordered from - The GC that ordered them - The EC that installs them - Check the contract
[This message has been edited by Celtic (edited 09-19-2006).]
Cord or no cord, I'll bet there are installation instructions that tell you if you are using a 4-wire configuration then you must remove the jumper. So the installer is responsible to follow the manufacturers instructions.
If the cord comes with the appliance (wich it seldom does), the installer at the factory has NO IDEA if the range is going into a new home or into an existing home as a replacement. My experience has been to bring both type cords with me to save on those pesky trips to the suppy house.
Speaking of the supply house, I have to get to mine in about 7 hours so time to get some sleep!
They do ship with cords attached if you order them that way. I can't imagine a builder ever ordering anything but 4 wire corded appliances. There should never be a 3 wire range or dryer plug in new construction. If the jumper is installed it is a factory problem.