Which combination of bends between pull points is allowed by the NEC?

The National Electrical Code (NEC) outlines specific limitations regarding the number and type of bends allowed in conduit runs, particularly between pull points. The NEC mandates that bends must be manageable to ensure that wire pulling is feasible and does not damage the conductors.

Option D is correct because it adheres to the NEC guidelines by maintaining a reasonable number of bends. It includes two 45° offsets, one elbow, and three 15° kicks. This arrangement offers a total of six bends, which is within the permissible limits established by the NEC for maintaining efficient wire pulling while avoiding the risks associated with excessive bends.

Each type of bend contributes to the overall bend configuration. The 45° offsets and elbow are considered gradual bends, reducing the stress on the conductors. The 15° kicks, being even gentler, further help in easing the transitions in the conduit run. This combination allows for flexibility in routing without exceeding the recommended limits for electrical installations.

The other combinations provided in the other options either exceed the total permissible bends or include types of bends that are not coordinated correctly for efficient installation, thereby not aligning with NEC standards. Therefore, option D stands out as the most compliant and practical choice.