I was curious to know why we only use sand for covering the AC cables inside the trenches and instead of having good isolation why these cables are covered. Why is there a problem in the trenches at the AC and DC cable crossings?
The electric cables that will be buried are anyway insulated, generally with a plastic material (ofte polyethylene). The sand is used to protect the cables against hard objects such as stones that are in the material filling the trenches.
In the case of the last one carried out, a draining trench cable was chosen with granular material of medium size 8-12 mm to facilitate the elimination of moisture in case of rains, on the other hand, a perforated pipe was placed at the bottom of the trench to speed up the evacuation of water
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