Trench specifications are critical for the thermal performance and mechanical protection of the cable. The standard trench depth and width depend on local regulations and the number of cables. For a single circuit, a common depth is around 1 meter.

• Backfill Material: To ensure proper heat dissipation, a layer of fine sand or a purpose-designed thermal backfill is used directly around the cables. This material has low thermal resistivity, preventing the cable from overheating.

• Protection: After the initial backfill, a layer of protective tiles or bricks is laid to serve as a physical barrier against future excavation damage.