2" Sch40 PVC

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nizak

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I would like thoughts on the following 4/0 XHHW-2 pull.

65' total length run, meter socket to mogul LB. 2" Sch40 PVC

4' to first standard radius 90. 3' from that point to a 45. 45' straight run to another standard radius 90. 10' straight run to the last standard radius 90 and 3' straight to mogul LB.

315 deg total.


Use long radius (36") 90's??

It falls into where I feel 2" is borderline. 2.5" is kind of an oddball around here and hard to get, 3" seems overkill.

Thanks
 
I never liked 4/0 in 2", even though pipe fill calcs say it's okay. I learned years ago 2.5" makes life a lot easier.
 
Long radius 90s do not impact the required pulling force in any of the calculations that I have seen. They are used to reduce the sidewall pressure (crushing force on the insulation) where the conductors are pulled around bends.
 
don_resqcapt19 said:
Long radius 90s do not impact the required pulling force in any of the calculations that I have seen. They are used to reduce the sidewall pressure (crushing force on the insulation) where the conductors are pulled around bends.
Click to expand...
They can also reduce the jamming force that the NEC worries about with certain conductor combinations. That translates sidewall pressure into additional frictional force beyond that predicted by a simple material coefficient of friction and single conductor sidewall force.
 
If you can push the conductors through the first 90 then you effectively remove it from the multiplying effects that increase pull tension. This doesn't change any code requirements...but might make your life easier.

-Jon
 
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