CSA C2.1:24

1 Scope 1.1 Inclusions This Standard specifies the requirements for distribution transformers except for those distribution transformers covered by CSA C2.2, CSA C227.3, and CSA C227.4. Note: The operation of transformers complying with this Standard by other than an electric utility might be subject to additional requirements by the electrical inspection authority having jurisdiction. 1.2 Ratings This Standard applies to single- and three-phase, 60 Hz, liquid-filled distribution transformers rated at 1000 kVA or below for single-phase, and at 3000 kVA or below for three-phase, up to 34.5 kV system nominal voltage. 1.3 Performance characteristics This Standard includes voltage ratings, kVA ratings, certain mechanical characteristics, and test procedures. It also includes the following performance characteristics: energy efficiency (in accordance with CSA C802.1), temperature rise, loading capabilities, sound level, and radio influence voltage (RIV). 1.4 Self-protected transformers This Standard also applies to self-protected transformers with the exception of protective equipment. 1.5 Exceptions Except as specified by other CSA Standards, this Standard does not apply to auto-, testing, dry-type, welding, furnace, rectifier, network, subway, or special-purpose transformers, or to step-voltage regulators. 1.6 Units of measurement The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only. 1.7 Terminology 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.