What should direct-buried conductors be arranged to prevent damage from?

Direct-buried conductors must be arranged to prevent damage from movement caused by settlement or frost. This is crucial because the ground can shift due to natural settling or frost heave, which can exert pressure on the buried conductors. If these conductors are not properly arranged or protected, they may become damaged, leading to potential electrical hazards such as shorts or interruptions in service.

When considering the other options, while moisture intrusion, electrical surges, and thermal expansion are valid concerns for electrical installations, they do not directly address the specific risks associated with the physical movement of the ground that can affect direct-buried conductors. These conductors require careful installation methods to ensure they can withstand the natural movements of the soil above them over time. Thus, ensuring the conductors are arranged to minimize damage from settlement or frost is essential for maintaining the integrity and safety of the electrical system.