For congested areas, the "draw-in" system using conduits and duct banks is the most suitable and widely adopted method. This approach involves installing pre-laid pipes (conduits) or a series of conduits grouped into a reinforced concrete structure (a duct bank) in a trench or via trenchless methods. Cables are then "drawn in" through these conduits.

This method is superior to direct burial in urban settings because:

• It protects cables from mechanical damage from other construction and utilities.

• It allows for easy replacement, repair, and future expansion of the cable network without the need for new, disruptive excavations.

• It is perfectly suited for use in joint trenching, where multiple utilities (electrical, telecommunication, etc.) share a single, protected underground pathway, maximizing space and minimizing excavation.