Final answer:
The minimum distance between the opposite side walls of the straight pullbox is 32''.
Step-by-step explanation:
To determine the minimum distance between the opposite side walls of the straight pullbox, we need to consider the spacing requirements for the conduits. According to the information provided, there are three conduits on each side of the box, with sizes of 3-4'', 3-2'', and 1-1''. To calculate the minimum distance, we need to determine the maximum side-to-side spacing required for these conduits.
According to the given reference, the newer work suggests a side-to-side spacing of as much as 8 diameters. Since the largest conduit is 4'' in diameter, the maximum side-to-side spacing would be 8 times 4'', which is 32''. Therefore, the minimum distance between the opposite side walls of the pullbox would be 32''.