AC suspension insulators

Amendment to the 3rd edition of CSA C411.1, AC suspension insulators. 

Preface 

This is the third edition of CSA C411.1, AC suspension insulators. It supersedes the previous editions, published in 2010 and 1989. The Standard has been updated to reflect current industry practice. 

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 

1.1 
This Standard applies to wet-process porcelain and toughened glass suspension-type insulators used on ac 
overhead power lines with a nominal voltage greater than 1000 V and a frequency not greater than 100 Hz. 

This Standard applies to single insulator units only and does not apply to long rod insulators. 

1.2 
This Standard specifies provisions for 

a) the mechanical, electrical, and dimensional characteristics of insulators and the conditions under which the 
specified values of these characteristics are verified; and 
b) test methods and acceptance criteria. 

1.3 
In this Standard, shall is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; should is used to express a recommendation or that which is advised but not required; and may is used to express an option or that which is permissible within the limits of the Standard. 

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note 
accompanying a clause is to separate from the text explanatory or informative material. 

Notes to tables and figures are considered part of the table or figure and may be written as requirements. 

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application. 

Notes:  1. Safety labelling in both official languages is mandatory, and therefore French warnings are provided in all English editions of safety standards. 2. In cases of ISO or IEC adoption where a French version exists, CSA Group reserves the right to publish a French version regardless of the documented stakeholder need.