Junction box fill

[77401]

Heres the scenario from today. I'm hooking up a new Panasonic Vent/Light/Night lite combo
Feeding the unit with one 12/2 & ONE 12/3
The J box on the unit is 1.5" x 2.5" x 3" Small
With the pigtails from the Unit plus my wires & wirenuts I'm barely able to close the cover. Its like I got 10 pounds of crap in a 5 pound box!

WHY DOESN"T THE MANUFACTURERs HAVE TO MEET 314.16?

5 #12 awg X 2.25
1 EGC X 2.25 =13.25 cuin

J box =11.25 cuin

 

[Jim W in Tampa]

Use 12-4 romex

 

[buck33k]

The JB you descride is hardly 12 cu. in. and it probably has factory conductors and a thermal device in the enclosure not including your NM cables.

I wonder how these combination units ever get UL listed, considering no thought is given to box fill.

The last one I installed was a Broan 732 (fan, light, heater). It was everything I could do to force on the JB cover. I should'nt have installed it.

 

[LarryFine]

Tack on a 4"sq with a chase nipple?

 

[infinity]

Tack on a 4"sq with a chase nipple?

Would the box be accessible after the sheetrock goes up?

 

[LarryFine]

Would the box be accessible after the sheetrock goes up?

It would upstairs. :twisted:

 

[dduffee260]

Would the box be accessible after the sheetrock goes up?

Oh it would be accessible. Just not ready accessible. Give me a sawzall and I can access almost any j-box.