IS 2713:2000 is the Indian Standard (BIS) for tubular steel poles for overhead power lines. This standard specifies the requirements for stepped and swaged tubular steel poles used in overhead power and telecommunication lines. It details the dimensions, weight tolerances, load capacities, and mandatory physical tests such as the drop, deflection, and permanent set tests.
Tubular Steel Poles for Overhead Power Lines
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Design Safety Approach | Working Stress Design (Factor of Safety = 2.5 for normal conditions) | Limit States Design (Uses separate Load and Resistance Factors, e.g., Load Factor for wind of 1.4) | ASCE/SEI 48-19 |
| Min. Yield Strength (Common Steel) | 250 MPa (for Grade E250 as per IS 2062) | 345 MPa (for ASTM A572 Grade 50) | ASCE/SEI 48-19 |
| Galvanizing Mass (for steel > 6 mm) | Min. average 610 g/m² (as per IS 4759) | Min. average 610 g/m² (85 μm) (as per EN ISO 1461) | EN 40-5:2013 |
| Transverse Deflection Limit | Shall not generally exceed 1/150 of the height above ground. | No mandatory value; evaluated as a serviceability requirement based on project needs (e.g., clearances). | ASCE/SEI 48-19 |
| Governing Welding Code | IS 816, IS 1323 | AWS D1.1 (Structural Welding Code - Steel) | ASCE/SEI 48-19 |
| Permissible Stress in Bending | 0.66 * Fy (where Fy is yield stress), based on WSD. | Not directly comparable; design capacity is checked against factored loads in LSD. | ASCE/SEI 48-19 |
| Longitudinal Seam Welding | Continuous weld with 100% penetration for poles made from two halves; 60% for single-sheet automatic welding. | Full penetration welds are typically required for longitudinal seams on transmission structures. | ASCE/SEI 48-19 |