240V Electric Range Outlets

[jeff48356]

When installing an electric range outlet where there is none, can a standard plastic 2-gang cut-in box be used? Or does the box need to be metal? The cable is 6-3 copper Romex (with ground), 4 conductors total, for a 4-wire circuit.

 

[infinity]

It all depends on how many cubic inches the box is and if the box can accept the proper cable clamp.

 

[480sparky]

I've never seen a range recep that didn't have the holes to line up to a 2-gang device box. That's all I use.... a 2-g plastic nail-on.

 

[Dennis Alwon]

I always surface mount the range receptacle but there are 2 gang boxes made for this purpose. I use 2 gangs for dryer and the receptacle will work just fine. Just get a 2 gang dryer plate.

 

[infinity]

Do they make 2 gang plastic cut-in boxes with KO's for a 6/3 connector?

 

[480sparky]

Do they make 2 gang plastic cut-in boxes with KO's for a 6/3 connector?

You mean like an 3/8" NM connector you'd use on a metal box? Yes.

 

[infinity]

You mean like an 3/8" NM connector you'd use on a metal box? Yes.

Is that box 40 cubic inches or more?

 

[Dennis Alwon]

I doubt that box is. Since the op is using 6/3 w/gr I bet it won't work. This one is only 38 cu. in and it is obviously larger than the old work box.

 

[suemarkp]

Why 40 cubic inches? (3) conductors + ground + internal clamp + device = 7 conductors * 5 cubic inches = 35 cu in. Not sure if the cable clamps need to be counted or not.

 

[Dennis Alwon]

Why 40 cubic inches? (3) conductors + ground + internal clamp + device = 7 conductors * 5 cubic inches = 35 cu in. Not sure if the cable clamps need to be counted or not.

The ground is #10 so I think you have 32.5 cu in. and P&S has this and it is 42 cu. inches anyway.

 

[infinity]

Why 40 cubic inches? (3) conductors + ground + internal clamp + device = 7 conductors * 5 cubic inches = 35 cu in. Not sure if the cable clamps need to be counted or not.

I forgot about the #10 EGC and assumed that the clamp was on the outside, also a large device might count as 4 conductors so you could end up with:

3-#6, B-R-W = 15 cu in
4-#6, Device = 20 cu in
1-#6, Clamp = 5 cu in
1-#10, EGC = 2.5 cu in

Total = 42.5 cu in

314.16(B)(4) Device or Equipment Fill. For each yoke or strap containing one or more devices or equipment, a double volume allowance in accordance with Table 314.16(B) shall be made for each yoke or strap based on the largest conductor connected to a device(s) or equipment supported by that yoke or strap. A device or utilization equipment wider than a single 50 mm (2 in.) device box as described in Table 314.16(A) shall have double volume allowances provided for each gang required for mounting.

 

[Dennis Alwon]

It's one device not two but I see what you are thinking.--I believe the receptacle will fit in a one gang box

 

[480sparky]

The ground is #10 so I think you have 32.5 cu in. and P&S has this and it is 42 cu. inches anyway.

That's not an old work box. :happysad:

 

[jumper]

It's one device not two but I see what you are thinking.--I believe the receptacle will fit in a one gang box

Dennis, IMO those center holes are only for mounting the receptacle into a single gang mud ring for a 4x4 box.

 

[jumper]

I forgot about the #10 EGC and assumed that the clamp was on the outside, also a large device might count as 4 conductors so you could end up with:

3-#6, B-R-W = 15 cu in
4-#6, Device = 20 cu in
1-#6, Clamp = 5 cu in
1-#10, EGC = 2.5 cu in

Total = 42.5 cu in

That is how I see it.

 

[Dennis Alwon]

Dennis, IMO those center holes are only for mounting the receptacle into a single gang mud ring for a 4x4 box.

The dryer is the exact same size device and it fits in a 1 gang box- we did that all the time when we had a 10/3 without gr.. It got tight with the ground but still fit but we went to a 2 gang.. The device is not wider than 2 inches so it only counts as one device.

 

[jumper]

The dryer is the exact same size device and it fits in a 1 gang box- we did that all the time when we had a 10/3 without gr.. It got tight with the ground but still fit but we went to a 2 gang.. The device is not wider than 2 inches so it only counts as one device.

Yes, but we are speaking of 6/3 w/g and the device, it ain't gonna legally fit here.

Unless you use an extension or two.

 

[Dennis Alwon]

Yes, but we are speaking of 6/3 w/g and the device, it ain't gonna legally fit here.

Unless you use an extension or two.

That does not mean the device counts as two devices. It is still a single device.

 

[hillbilly1]

I always surface mount the range receptacle but there are 2 gang boxes made for this purpose. I use 2 gangs for dryer and the receptacle will work just fine. Just get a 2 gang dryer plate.

Ditto here too, no use getting fancy and cutting in a box behind a range when it's not going to get seen.

 

[mbednarik]

the carlon b232 and the thepit tp3600 are only rated for #10 and smaller wire according to the manufacuturer. For all #8 and larger wiring you need to use a metal or a box like the p and s one shown earlier, i got dinged on a rough-in inspection about a year ago on this subject.