Preface
This is the fifth edition of CSA C22.2 No. 47, Air-cooled transformers (dry type). It is one of a series of Standards issued by CSA Group under Part II of the Canadian Electrical Code. It supersedes previous editions published in 1990, 1977, 1961, and 1940, and it is written in SI (metric) units.
For general information on the Standards of the Canadian Electrical Code, Part II, see the preface of CAN/CSA-C22.2 No. 0.
This edition mainly serves to incorporate CSA TIL No. I-28 (K-factor ratings), update the scope to clarify the products not covered by this standard, clarify marking requirements, clarify openings and enclosures requirements, and update the reference publications.
This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard.
This Standard was prepared by the Subcommittee on Air-Cooled Transformers (Dry Type), under the jurisdiction of the Technical Committee on Industrial Products and the Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the Technical Committee.
Scope
1.1
This Standard applies to single-phase and polyphase transformers of the dry type for supplying energy to power, heating, and lighting circuits and designed to be installed and used in accordance with the Canadian Electrical Code, Part I.
1.2
This Standard applies to multiwinding and autotransformers rated 72.5 kV class and less.
1.3
This Standard applies to transformers for use in nonhazardous indoor and outdoor locations.
1.4
This Standard does not apply to specialty transformers, transformers for luminous-tube signs, oil or gas burner ignition, cold-cathode interior lighting, or electronic or liquid-filled designs.
1.5
This Standard does not include energy efficiency or product performance requirements. For such requirements, see CAN/CSA-C802.2 or CSA C9 where applicable.
1.6
General requirements applicable to this Standard are provided in CAN/CSA-C22.2 No. 0.
1.7
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.
