ICS 91.080.10                         CED 07

Reaffirmed 2021

1 Scope

1.1 This standard (Part 1/Section 2) stipulates the design strengths and other design parameters to be adopted in the design of self-supporting steel lattice towers (using angles hollow sections) for overhead transmission lines.

1.1.1 Materials, type of towers, loading and broken wire conditions are covered in IS 802 (Part 1/Sec 1).

1.1.2 Provisions on fabrication and testing of transmission line towers have been covered in Part 2 and Part 3, respectively of IS 802.

1.1.3 Provisions for loads and design strengths for latticed switch yard structures are covered in IS 802 (Part 4) (under preparation).

1.1.4 Provisions for loads and design strengths for tall river crossing towers shall be covered in a separate standard (under preparation).

NOTES

1 While formulating the provisions of this standard, it has been assumed that the structural connections are through bolts.

2 For critical connections, welded joints can be adopted subject to approval of purchaser/end user as per relevant standards.

1.2 This standard does not cover guyed towers.

2. Referenced Documents

The standards listed below contains provisions, which through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below:

IS No. Title

800 : 2007 Code of practice for general construction in steel (third revision)

802 (Part 1/Sec 1) : 2015 Code of Practice for use of structural steel in overhead transmission line towers : Part 1 Material, loads, and design strength, Section 1 Materials and loads (fourth revision)

802 (Part 2) :1978 Code of Practice for use of structural steel in overhead transmission line towers: Part 2 Fabrication galvanizing, inspection and packing

802 (Part 3): 1978Code of Practice for use of structural steel in overhead transmission line towers: Part 3 Testing

802 (Part 4)(under preparation)Code of practice for use of structural steel in overhead transmission line towers and substation structures: Part 4 Requirements for latticed switchyard structures

5613 (Part 3/Sec 1) : 1989 Code of Practice for design, installation and maintenance of overhead power lines: Part 3 400 kV Lines, Section 1 Design

12427 : 2001 Fasteners – Threaded steel fasteners – Hexagon head transmission tower bolts – Specification (first revision)