Sizing Jbox with conductors over #4 AWG

[crtemp]

How would I size a box to fit (2) 350, (5) 4/0, and (1) 2/0. Table 314.16(b) only goes to #6. Was hoping to get away with a pvc box, just not sure on the size. The box would have to take a 3” pvc and two 2” pvc conduits as well so I’m sure it would need to be pretty big. I’m just curious on the method to size it.

 

[tom baker]

Its based on the connected raceway sized and how arranged. Best to review in NEC

 

[Jerramundi]

Check out 314.28(A)

 

[crtemp]

That’s what I am seeing. Thanks for the clarification.

 

[Jerramundi]

That’s what I am seeing. Thanks for the clarification.

I think that only has to do with a single dimension to the opposite wall. Depth may also be a requirement elsewhere.
Not something I typically deal with.

 

[SSDriver]

EC&M article on sizing junction boxes. They basically just used all of Mike Holts pictures

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[infinity]

EC&M article on sizing junction boxes. They basically just used all of Mike Holts pictures

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Mike wrote the article.

 

[don_resqcapt19]

I think that only has to do with a single dimension to the opposite wall. Depth may also be a requirement elsewhere.
Not something I typically deal with.

The only depth requirement is that it be deep enough to accommodate the raceways and their locknuts and bushings.

 

[kwired]

Six for tricks, eight for straight - is a little saying to help remember. Keep in mind that gives you minimum size NEC wants, usually sufficient for pulling through, if you are splicing you may want to increase size beyond those minimum's in some instances. What seems like a lot of room disappears quickly once you start making things up

 

[Greentagger]

Depth also determined by 314.28(A)(2)Exception; if applicable.

 

[Jerramundi]

The only depth requirement is that it be deep enough to accommodate the raceways and their locknuts and bushings.

What about 314.24?

 

[SSDriver]

I would think you need to have the proper wire bending space if it's coming out of the back of the J-Box

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[Greentagger]

I would think you need to have the proper wire bending space if it's coming out of the back of the J-Box

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Yes sir, that would be 314.28(A)(2)Exception

 

[infinity]

What about 314.24?

That is not applicable to what Don mentioned. It specifically mentions Outlet and device boxes.

314.24 Depth of Boxes. Outlet and device boxes shall have an approved depth to allow equipment installed within them to be
mounted properly and without likelihood of damage to conductors within the box.