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Where Steel (Tubular) Poles are used?
LT distribution network
Span up to 80 m
city area
All of these
All of these
Steel tubular poles are widely used in electrical distribution systems due to their high mechanical strength, aesthetic appearance, and compact footprint. They are suitable for low tension (LT) distribution networks, city or urban areas where space is constrained, and for line spans ranging up to 80 meters.
IS 2713 (Part 1 to 3): 1980
Steel tubular poles are widely used in electrical distribution systems due to their high mechanical strength, aesthetic appearance, and compact footprint. They are suitable for low tension (LT) distribution networks, city or urban areas where space is constrained, and for line spans ranging up to 80 meters.
M=╧Г├ЧZ тАФ Bending moment capacity of the tubular section
S=8TwL2тАЛ тАФ Sag equation determining clearance for a given span length L
Tubular steel poles derive their structural integrity from a stepped or swaged hollow circular steel section. This configuration efficiently resists bending moments caused by wind loads and line tension while maintaining a lightweight profile compared to solid or lattice structures. They are coated or galvanized to protect against atmospheric corrosion.
Tubular steel poles are manufactured as stepped or swaged types according to IS 2713.
They are widely preferred in congested urban/city areas due to their neat appearance and small ground space requirements.
The standard span length for tubular steel pole distribution lines ranges between 50 m to 80 m.
Longer life compared to wooden poles.
Higher mechanical strength and better safety margin than wooden poles.
Occupies minimal ground space, making it ideal for urban areas.
Higher initial cost compared to wooden or RCC poles.
Requires periodic painting or galvanization to prevent corrosion.
Lower insulation level compared to wooden poles (requires proper grounding).
Low Tension (LT) and High Tension (HT) distribution lines up to 11 kV.
Street lighting and urban distribution in congested city roads.
Overhead line supports where spans up to 80 m are required.
Option A is correct because steel tubular poles are extensively used for LT distribution.
Option B is correct because the typical economical span for steel tubular poles is 50 to 80 meters.
Option C is correct because their sleek design and high strength make them ideal for city/urban areas.
Since options A, B, and C are all valid applications and parameters, Option D ('All of these') is the correct choice.
D is correct тАФ Steel tubular poles are utilized in LT distribution networks, suitable for city areas, and designed for line spans up to 80 meters.
For competitive exams, remember the typical span lengths: Wooden poles (30-50 m), Steel Tubular poles (50-80 m), RCC poles (80-100 m), and Steel Lattice Towers (200 m and above).