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Preferred voltage levels for AC systems up to 50 000 V
This is the third edition of CSA C235, Preferred voltage levels for AC systems up to 50 000 V. It supersedes the previous editions, published in 1969 and 1983. Prior to 1969 the need for a recognized set of voltage standards in Canada had been the concern of the electrical industry throughout its history. In preparation for the first edition many studies, questionnaire surveys, and discussions of national scope were conducted. Since its initial publication in 1969 this Standard has served well as a guide to those who are involved in the problems of applying a great variety of voltage levels across the country. Improved equipment design ratings and controlled system design levels have both resulted. The second edition called for better definition of steady-state voltage and the way that it is assessed with respect to supply voltage variations for circuits up to 50 000 V. Major changes in this third edition include
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
This Standard establishes steady-state voltage operating ranges at point of connection for AC power systems in Canada. It serves to provide guidance
The establishment of standards on this basis is aimed at future development towards more uniformity on a national basis. This Standard includes nominal voltages and supply steady-state voltage ranges at point of connection under both normal and extreme operating conditions. This Standard does not include voltage operating ranges at utilization points
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.
| SDO | CSA: Canadian Standards Association |
| Document Number | |
| Publication Date | Jan. 1, 2019 |
| Language | en - English |
| Page Count | 21 |
| Revision Level | |
| Supercedes | |
| Committee |
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