50A range receptacle in 2 gang plastic box

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Rick 0920 said:
The code section refers to receptacles wider than a standard single gang box. But based on the fact that you CAN install it in a single gang box, the double volume allowance would be correct.
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So this receptacle clearly states not to install in a single gang box or mudring. I would take that to mean it requires a double double allowance (4 total):

279-S00

Black - 50 Amp, 125/250 Volt, NEMA 14-50R, 3P, 4W, Flush Mtg Receptacle, Straight Blade, Industrial Grade, Grounding, Side Wired, Steel Strap
www.leviton.com www.leviton.com

Whereas as this product looks similar but none of the literature on the website addresses the question. It has central mounting holes on the yoke. Do we assume it's OK for single gang mounting, or assume not?

279-S00

Black - 50 Amp, 125/250 Volt, NEMA 14-50R, 3P, 4W, Flush Mtg Receptacle, Straight Blade, Industrial Grade, Grounding, Side Wired, Steel Strap
www.leviton.com www.leviton.com

Cheers, Wayne
 
wwhitney said:
So this receptacle clearly states not to install in a single gang box or mudring. I would take that to mean it requires a double double allowance (4 total):

279-S00

Black - 50 Amp, 125/250 Volt, NEMA 14-50R, 3P, 4W, Flush Mtg Receptacle, Straight Blade, Industrial Grade, Grounding, Side Wired, Steel Strap
www.leviton.com www.leviton.com

Whereas as this product looks similar but none of the literature on the website addresses the question. It has central mounting holes on the yoke. Do we assume it's OK for single gang mounting, or assume not?

279-S00

Black - 50 Amp, 125/250 Volt, NEMA 14-50R, 3P, 4W, Flush Mtg Receptacle, Straight Blade, Industrial Grade, Grounding, Side Wired, Steel Strap
www.leviton.com www.leviton.com

Cheers, Wayne
Click to expand...
clamp 1.jpgclamp 2.jpg
Wayne, I would say that you could mount it in a single gang box, but I still don't see how you could comply with box fill requirements using #6 conductors as well as the headache you would have trying to cram it into the box.
 
wwhitney said:
So this receptacle clearly states not to install in a single gang box or mudring. I would take that to mean it requires a double double allowance (4 total):

279-S00

Black - 50 Amp, 125/250 Volt, NEMA 14-50R, 3P, 4W, Flush Mtg Receptacle, Straight Blade, Industrial Grade, Grounding, Side Wired, Steel Strap
www.leviton.com www.leviton.com

Whereas as this product looks similar but none of the literature on the website addresses the question. It has central mounting holes on the yoke. Do we assume it's OK for single gang mounting, or assume not?

279-S00

Black - 50 Amp, 125/250 Volt, NEMA 14-50R, 3P, 4W, Flush Mtg Receptacle, Straight Blade, Industrial Grade, Grounding, Side Wired, Steel Strap
www.leviton.com www.leviton.com

Cheers, Wayne
Click to expand...
WARNING: Do not use with single-gang wallboxes, single-gang mud rings or single-gang box extenders.--Copied from your linked page.
 
Rick 0920 said:
Wayne, I would say that you could mount it in a single gang box, but I still don't see how you could comply with box fill requirements using #6 conductors as well as the headache you would have trying to cram it into the box.
Click to expand...
As to the Carlon FAQ, sounds like that information is out of date, given the last sentence of 314.16(B)(2) as BarneyB referenced. Which basically says the same thing I said in my first post in this thread, that the marked internal volume of plastic boxes with molded in clamps already excludes the volume of the clamp.

As to mounting a 14-50R in a single gang box, I agree it would be hard to find a plastic single gang of volume 32.5 in^3 when using NM 6/3. But if using a 40A breaker and 8/3 NM, you'd only need 20.5 in^3.

Cheers, Wayne
 
wwhitney said:
So this receptacle clearly states not to install in a single gang box or mudring. I would take that to mean it requires a double double allowance (4 total):
Click to expand...
The NEC does not say that the manufacturer's instructions apply to the calculation in post #5. When you follow the exact NEC wording is says if it fits in the 2" wide single gang box it get a deduction of only 2 conductors.

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.
Click to expand...
 
infinity said:
When you follow the exact NEC wording is says if it fits in the 2" wide single gang box it get a deduction of only 2 conductors.
Click to expand...
The part you quoted certainly says that if the device is <=2" wide, it only requires one double allowance. But the round part of a 14-50 receptacle is more than 2" in diameter. So that conclusion will never apply to a 14-50 receptacle.

However, that doesn't mean that a 14-50 receptacle always requires two double allowances. The sentence quoted says to consider more than one double allowance if the device is wider than 2", but to decide on the basis of how many gangs are required for mounting. That is why I say that the manufacturer's guidance on how much mounting space is required for the device is determinative.

Cheers, Wayne
 
I never use regular 2 gang box for range outlet because an inspector rejected it because he said it was not rated for such a wire. I always use range box by Allied molded, Arlington, or pass and Seymour.

Can I use regular box?
 
I use this box for range receptacles, sometimes I use #6, (which I know is under fill requirements) but most times I use #8. Had no problems with inspections.

1668972871489.png
 
Yeah exactly thats ones I use, The local home improvement stores used to be about 16 CUIN per gang in residential so
to avoid overstuffed boxes I used to 'special' order the residential boxes form our supply house, as its was not the sizes they normally stocked, I specify a minimum of 20 -24 cubic inches per gang like these:
But I also almost never see ranges over 16.5 kw around here so our typical ranges are wired with 8/3
 
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