3 wire range receptacle / new range with 4 wire cord

[T.R.M.]

In a situation where you have a old 3 wire range plug and a new range with a 4 wire cord what are the options to remedy the situation ? Are there any options besides changing the cord to a 3 wire cord ?

 

[Dennis Alwon]

In a situation where you have a old 3 wire range plug and a new range with a 4 wire cord what are the options to remedy the situation ? Are there any options besides changing the cord to a 3 wire cord ?

It is perfectly legit to change the cord to 3 wire otherwise run a new circuit. Make sure when you change the cord the grounding is done correctly as wires must be moved.

 

[T.R.M.]

range cord

range cord

Dennis , you mean install the grounding jumper back between the gnd terminal and the frame ?

 

[Dennis Alwon]

Dennis , you mean install the grounding jumper back between the gnd terminal and the frame ?

The egc and grounded conductor must be tied together in the dryer.

 

[dkidd]

Or the range.

 

[Dennis Alwon]

Or the range.

LOL yeah I guess that was what the OP asked. :lol:

 

[Sierrasparky]

So you would say that it is ok to use the ground wire as a nuetral when the circuit is fed by a sub panel and the wiring is NM cable not SE or one of those exceptions?

What if is was never allowed to use the Equipment ground in such cases?

 

[Dennis Alwon]

So you would say that it is ok to use the ground wire as a nuetral when the circuit is fed by a sub panel and the wiring is NM cable not SE or one of those exceptions?

IMO, the code allowed (past tense) nm if the egc was insulated-- 10/3 nm with no ground. I know others believe it has to originated at service equipment but that is not how I read or understand 250.140.except(3)

What if is was never allowed to use the Equipment ground in such cases?

That is a different issue- then I would change the wire. I usually talk people into an upgrade unless it is not practical.

 

[iwire]

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, wyeconnected
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 serviceentrance
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.

 

[Dennis Alwon]

(3) The grounded conductor is insulated, or the grounded conductor is uninsulated and part of a Type SE serviceentrance
cable and the branch circuit originates at the service equipment.

I read that as

1) The grounded conductor is insulated,

or

2) the grounded conductor is uninsulated and part of a Type SE serviceentrance cable and the branch circuit originates at the service equipment.

 

[iwire]

I am staying out of this one.