What kind of installation does a place for direct burial of wires imply?

The choice indicating installation underground without conduit is correct because direct burial of wires means that the wires are designed to be laid directly in the ground without additional protective covering such as conduit. This type of installation relies on the insulation of the wires and their ability to withstand environmental conditions. Wires specifically rated for direct burial are constructed to prevent damage from moisture, soil, and other underground elements.

In contexts where direct burial is employed, it is crucial to ensure that the wire used is specifically engineered for this purpose, which involves durability and resistance to corrosion. This method is often chosen for its simplicity and cost-effectiveness but requires careful planning in terms of depth and placement to prevent potential hazards and ensure functionality.