anyone know a simple way to calculate size of j box

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There's no "simple way" as the layout of your conduits make a difference (Number of conduits in a row, distance between conduit entries, makes a difference).
It is highly unlikely 24" will work for the 3 entering the top to the opposite wall.
24" wide should not be necessary (again depending on your conduit layout) and 10" deep is not necessary.
Have you looked at 314.28 ?
 
cowboyjwc said:
If it looks to full, it probably is. But that's just from an inspectors stand point.
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In this case there is no "fill" issue. That only applies when the conductors are #6 and smaller.

The issue we have here is the space between the conduits that contain the same conductor and the bending space for the conductors based on the exception for angle or U pulls.
 
don_resqcapt19 said:
In this case there is no "fill" issue. That only applies when the conductors are #6 and smaller.

The issue we have here is the space between the conduits that contain the same conductor and the bending space for the conductors based on the exception for angle or U pulls.
Click to expand...

The OP also said, Jbox, what he really meant then was, pull box.
 
cowboyjwc said:
The OP also said, Jbox, what he really meant then was, pull box.
Click to expand...
It doesn't matter what it is called. There are no volume calculations for conductors #4 and larger.

Yes, I am aware that 314.16 says it applies to the larger conductors, but there is no information in the code that lets you apply it.
 
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