How should direct-burial cables be penetrated when transitioning to raceways?

When transitioning direct-burial cables to raceways, the use of a bushing is appropriate because a bushing serves to protect the cable insulation from abrasion as it enters the raceway. In this scenario, direct-burial cables often have a rough exterior that can become damaged if not properly secured or protected during the transition to a raceway system.

Bushings help to ensure that there is no direct contact between the cable and the sharp edges of the raceway opening, which can potentially lead to insulation failure over time. Additionally, the bushing allows for a smooth, strain-relieved entry point into the raceway, which is vital for maintaining the integrity and safety of the electrical system.

Other methods such as splice boxes or conduit connectors serve different functions. Splice boxes are used for joining cables, which is unrelated to the transition of burial cables into a raceway. Conduit connectors, while useful for attaching conduits, do not provide the necessary protection for direct-burial cables at the point of entry. Non-metallic fittings can be suitable in many cases but may not specifically provide the same level of insulation protection as a bushing designed for this purpose. Hence, the best choice for the transition of direct-burial cable to