Preface 

This is the fifth edition of CSA C390, Test method, marking requirements, and energy efficiency levels for three-phase induction motors . It supersedes the previous editions published in 2010, 1998, 1993, and 1985 under the title Energy Efficiency Test Methods for Three-Phase Induction Motors, and CSA Preliminary Standards C390.1 and C390.2, published in 1982. This new edition was revised to harmonize the Standard to the extent possible with the relevant IEC and IEEE Standards. Major changes to this edition include the following: a) revising the Scope to remove an upper limit in the size of the motor that could be tested; b) revising the definition for thermal equilibrium; c) revising energy efficiency levels and tables; d) revising Annex C to include mandatory language; and e) replacing the former Annex D, which had contained Canadian energy efficiency regulatory information. CSA acknowledges that the development of this Standard was made possible, in part, by the financial support of BC Hydro, the Canadian Electricity Association (CEA), Hydro-Québec, the Independent Electricity System Operator (IESO), Manitoba Hydro, and Natural Resources Canada. 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 the Performance of Three-Phase Induction Motors, under the jurisdiction of the Technical Committee on Industrial Equipment and the Strategic Steering Committee on Performance, Energy Efficiency, and Renewables, 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 

1.1 Application 

This Standard specifies a test method for three-phase induction motors rated 0.746 kW and higher. The Standard also references energy efficiency levels for three-phase induction motors rated 0.746 kW up to 400 kW. This Standard references energy efficiency levels for both NEMA and IEC motor designations. Efficiency requirements for units rated for operation at 60 Hz are defined in Tables 3, 4, 5, 7, 8, 9, and 12. Efficiency requirements for units rated for operation at 50 Hz are defined in Tables 6, 10, and 11. Note: This Standard is not limited to specific types of three-phase induction motors, but where this Standard is referenced in regional legislation some specific motor types might be included or excluded from the regulations. Legislated requirements for a given jurisdiction supersede the requirements of this Standard and neither should be used without the other. 

1.2 Terminology 

In CSA standards, "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 (nonmandatory) to define their application. 

1.3 SI units 

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.