Calculation Sheet

Job Number

WBS Number

Page Number  

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Rev

Date

 By

Ck

 Title

Straight Pullbox Sizing Calculation

Project: 

Location:

Approach:     Pullbox is sized per NEC 370-28(a) for #4 or larger conductor.  For straight pulls, the length of the box shall not be less than 8 times the largest conduit diameter.  Width is based on spacing for locknuts. 
Click here for conduit spacing  Click for Hoffman (enclosures and boxes)

Program: 

Results:                               

Width = inches

Length=inches