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The system of laying underground cables adopted in congested areas, where excavation is expensive and inconvenient is
Draw in system
Solid system
Direct selling
Any of above
Draw in system
The Draw-in system is the preferred method in congested urban areas because it allows for the installation, maintenance, and replacement of cables without the need to perform frequent excavation of roads or pavements. It involves laying underground conduits or pipes, through which cables are pulled, thereby minimizing site disruption.
The Draw-in system is the preferred method in congested urban areas because it allows for the installation, maintenance, and replacement of cables without the need to perform frequent excavation of roads or pavements. It involves laying underground conduits or pipes, through which cables are pulled, thereby minimizing site disruption.
RinsтАЛ=2╧АL╧БтАЛln(rRтАЛ) тАФ Insulation resistance of the cable, which remains protected in conduits
In this system, earthenware or cement concrete pipes or conduits are laid in the ground with manholes at suitable intervals. The cables are pulled into these pipes using a cable-pulling machine through the manholes. Because the pipes protect the cables and provide access points, cables can be repaired or replaced by simply pulling them out and re-threading new ones.
Uses circular pipes or ducts made of stoneware, concrete, or cast iron.
Essential in busy city centers to avoid traffic congestion and high excavation costs.
Enables easy maintenance without digging up the street.
Requires high initial capital investment compared to the solid system.
Ease of cable maintenance and replacement.
No requirement for extensive road excavation.
Provides mechanical protection to the cable.
High initial installation cost.
Reduced current-carrying capacity due to poor heat dissipation in conduits.
Risk of moisture accumulation if not properly sealed.
Congested urban areas.
Major road crossings.
Inside industrial plant complexes.
The Solid System involves laying cables in troughs filled with bituminous compound, which is cheaper but makes maintenance impossible without excavation.
Direct Laying (Direct Buried) is the cheapest but makes future repairs highly inconvenient due to excavation requirements.
A is correct тАФ The draw-in system allows for maintenance and replacement of underground cables without the need for periodic excavation, making it ideal for congested areas.
Always remember: 'Draw-in' = Easy maintenance, high cost; 'Direct Laying' = Low cost, hard maintenance; 'Solid' = Cheap, difficult maintenance.