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The usual spans with R.C.C. poles are
40-50 metres
60-100 metres
80-150 meters
200-300 meters
80-150 meters
Reinforced Cement Concrete (R.C.C.) poles are commonly used in electrical distribution systems for spans ranging from 80 to 150 meters. These poles offer superior mechanical strength and weather resistance compared to wooden poles, allowing for larger spacing between consecutive supports.
Reinforced Cement Concrete (R.C.C.) poles are commonly used in electrical distribution systems for spans ranging from 80 to 150 meters. These poles offer superior mechanical strength and weather resistance compared to wooden poles, allowing for larger spacing between consecutive supports.
S=8тЛЕTwтЛЕl2тАЛ тАФ where S is sag, w is conductor weight per unit length, l is span, and T is tension.
The span length of a transmission line is determined by the mechanical strength of the pole and the tension exerted by the conductors. R.C.C. poles are designed to withstand significant transverse loads and vertical forces, enabling an optimized span-to-cost ratio for low and medium voltage distribution networks.
R.C.C. poles have a longer service life and require minimal maintenance compared to timber or steel poles.
The 80-150 meter range is optimal for distribution lines to balance voltage drop and mechanical stability.
R.C.C. poles are prone to cracks if improperly handled, which can lead to reinforcement corrosion.
High resistance to environmental degradation (rust, decay, termites).
Economical maintenance costs.
Higher mechanical strength for medium-span distribution.
Heavier weight makes transportation and erection challenging.
Fragile during handling, prone to cracking.
Difficult to repair once significant structural cracks appear.
Low voltage distribution (LT) lines.
11 kV and 33 kV rural electrification projects.
Street lighting poles.
Wooden poles typically serve shorter spans of 40-50 meters.
Steel tubular poles can support spans up to 100-150 meters but are more expensive.
Lattice steel towers are used for long-span high-voltage transmission lines (200-400+ meters).
C is correct тАФ R.C.C. poles are primarily utilized for distribution line spans in the range of 80-150 meters due to their structural robustness.
Always remember that span length is inversely proportional to the sag for a fixed tension; thus, choosing the right material ensures the line maintains the required ground clearance without exceeding conductor tension limits.