Two 4-inch raceways form a straight pull through a wireway. Which rule controls the minimum length in the pull direction?
- AThe conductor insulation color for the described C-10 installation and documented operating conditions
- BThe number of breaker spaces
- The straight-pull sizing rule based on the largest raceway trade size
- DThe building floor area
Why C is correct
The best answer is: The straight-pull sizing rule based on the largest raceway trade size. Pull-box dimensions for large conductors are determined from raceway arrangement and trade size so conductors can be installed without damage. Panel spaces, color, and floor area are unrelated. This transferred field condition tests the same installation or safety principle in a different project context. The other choices conflict with the cited rule, listing, safe-work process, or necessary diagnostic sequence.