CSA C22.3 NO. 60826:19 (R2023)

CSA Preface This is the third edition of CSA C22.3 No. 60826, Overhead transmission lines — Design criteria, which is an adoption, with Canadian deviations, of the identically titled IEC (International Electrotechnical Commission) Standard 60826 (fourth edition, 2017-02). It supersedes the previous edition published in 2010 as CAN/CSA-C22.3 No. 60826, Design criteria of overhead transmission lines (adopted IEC 60826:2003). It is one in a series of Standards issued by CSA Group under Part III of the Canadian Electrical Code. At the time of publication, IEC 60826:2017 is available from IEC in English only. CSA Group will publish the French version when it becomes available from IEC. For brevity, this Standard will be referred to as “CSA C22.3 No. 60826” throughout. The Standard deals with the reliability-based design of overhead electrical transmission lines. This Standard is intended to be used in conjunction with CSA C22.3 No. 1, Overhead systems. Update No. 1 includes the following additions to address climate change adaptation: • climatic data for selected locations; • flooding and flood hazard zones; • weather loadings; • in-cloud icing and reference wind speed; and • discontinuous permafrost. This Standard was reviewed for Canadian adoption by the CSA Subcommittee on Reliability-Based Design of Overhead Lines, under the jurisdiction of the CSA Technical Committee on Overhead Systems and the CSA Strategic Steering Committee on Power Engineering and Electromagnetic Compatibility, and has been formally approved by the Technical Committee. This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group. Scope This International Standard specifies the loading and strength requirements of overhead lines derived from reliability-based design principles. These requirements apply to lines 45 kV and above, but can also be applied to lines with a lower nominal voltage. This document also provides a framework for the preparation of national standards dealing with overhead transmission lines, using reliability concepts and employing probabilistic or semi-probabilistic methods. These national standards will need to establish the local climatic data for the use and application of this standard, in addition to other data that are country-specific. Although the design criteria in this standard apply to new lines, many concepts can be used to address the design and reliability requirements for refurbishment, upgrading and uprating of existing lines. This document does not cover the detailed design of line components such as supports, foundations, conductors or insulators strings.