PULL BOXES

[ohmhead]

I have a question about pull boxes article 314# straight pulls are eight times the largest raceway which is the length of the box .

Angle or U- pull is six times the largest raceway plus increased for additional entries in that same row .

What if you come into the back of a large pull box and exit the sides is it still covered by the NEC because its not explained that way in the code book . Code only shows side wall to opposite side wall it does not express back wall .

So were not using the side wall we are coming into the back of the box with 8# 3" conduits and exiting the pull box on both sides 4 conduits on the left side and four on the right side .

Would bending radius 300.34 take over this requirement .

Reason iam asking is one inspector says yes its not in the code and its fine .
Now we have a new inspector which says no it needs to be per the code but my question to him was show me were it explains back wall to side wall .

As long as we have the bending space should we be ok with 300.34 ?

Which inspector is correct ?

 

[Smart $]

Coming in the back and exiting a side would make it an angle pull.

The back to front dimension, assuming the front is a removable cover, is covered by the exception... so it can be determined by Table 312.6(A). You didn't provide wire size.

The side to side dimension must be six times 3" plus 3" times every additional entry. Assuming all entries in one row on each side: 6*3" + 3*3" = 27" minimum left-to-right dimension.

 

[augie47]

also keep in mind the "the distance between raceway entries enclosing the same conductor shall not be less than times the trade size of the larger raceway"

 

[ohmhead]

Coming in the back and exiting a side would make it an angle pull.

The back to front dimension, assuming the front is a removable cover, is covered by the exception... so it can be determined by Table 312.6(A). You didn't provide wire size.

The side to side dimension must be six times 3" plus 3" times every additional entry. Assuming all entries in one row on each side: 6*3" + 3*3" = 27" minimum left-to-right dimension.

Well pipe size was 2 runs of 3 " conduit the wire size was 3/0 copper ABCNN 200 % neutral 3 phase each run ground is a no.3#awg . This was a 400 amp feeder each .
I had 4 runs coming in the back of a pull box and they were stacked 4 on top of 4 runs total of 8 runs coming in the back .Each run of 2 conduits 4 on the left side wall and 4 on the right side wall .
So 3 "x 6 = 18 " plus 3"+3" +3" = 27 " I installed a 36 x36 x12" deep box on the wall.



If I used 312.6A I need 8 " of space bending wise .

I had more than that space from back wall to side wall with 12" can depth.
What your saying is it still needs to be treated like a angle or u pull is that correct . So I would need 27 " from conduit on back wall to side wall conduit .

Treated just like a u pull no exceptions ?

Now if I installed a gutter this would all be different ?

 

[Smart $]

Well pipe size was 2 runs of 3 " conduit the wire size was 3/0 copper ABCNN 200 % neutral 3 phase each run ground is a no.3#awg . This was a 400 amp feeder each .
I had 4 runs coming in the back of a pull box and they were stacked 4 on top of 4 runs total of 8 runs coming in the back .Each run of 2 conduits 4 on the left side wall and 4 on the right side wall .
So 3 "x 6 = 18 " plus 3"+3" +3" = 27 " I installed a 36 x36 x12" deep box on the wall.



If I used 312.6A I need 8 " of space bending wise .

I had more than that space from back wall to side wall with 12" can depth.
What your saying is it still needs to be treated like a angle or u pull is that correct . So I would need 27 " from conduit on back wall to side wall conduit .

Treated just like a u pull no exceptions ?

Now if I installed a gutter this would all be different ?

312.6(A) is only used for the back-to-front dimension minimum.

The minimum distance between conduit entries containing the same conductor (6x) is regardless of wall location. Code doesn't specify how to measure, so assume nearest edge to nearest edge. In your case, that'd be 18" from back entry conduit to side entry conduit containing same conductor(s).