scope:

Preface

This is ihc second edition of CAN/CSA-C22.2 No. 950 in a Series of Standards issued by Canadian Standards Association under Part II of the Canadian Electrical Cade

This Standard is based on 1EC Publication 950 second edition (1991), Safety of Information Technology Equipment Including Electrical Business Equipment, and on Amendments 1 (February 1992) and 2 (June 1993) to that Publication. Deviations from the IEC text have been introduced for conformity with existing Canadian regulatory requirements and the need for an orderly transition from specifically Canadian to International requirements. Some deviations have been introduced in the context of similar deviations contained in UL Standard 1950. This edition is a further step towards international harmonization in coordination with similar actions by Underwriters Laboratories Inc.. by the CENELEC countries in Europe, and by other countries.

To assist in understanding the relationship of deviations to the original IEC text, the new text has been underlined. If deviations necessitate the deletion of IEC 950 text, the EEC 950 text has been retained but has been, EEC 950 Clause. Table, and Figure numbers have been retained. New clauses have been added by extending the IEC 950 numbering. New Table. Figure and Appendix numbering is identified by the prefix CAN-.

For general information on the Standards of the Canadian Electrical Code. Part II. see the Preface of C22.2 No. 0. General Requirements-Canadian Electrical Code. Part II.

Though the second edition of IEC 950 contains requirements for equipment connected to telecommunication networks, for the purpose of this edition of CSA Standard C22.2 No. 950. the applicability is limited by the Scope to the same equipment covered by the previous edition. The next edition of this Standard, currently in preparation, is intended to include equipment within the Scope of CSA Standard C22.2 No. 225. with which it will merge.

This Standard was prepared by a Subcommittee of the Technical Committee on Consumer and Commercial Products under the jurisdiction of the Standards Steering Committee on the Canadian Electrical Code. Pan II and was formally approved by these Committees. It has been approved as a National Standard of Canada by the Standards Council of Canada.

December 1993

Notes:

(1) Use of the singular in this Standard does no! exclude the plural (and vice versa) when the sense allows.

(2) Although the intended primary application of this Standard b staled in its Scope, it is important to note that it remains the responsibility of the users of the Standard to judge its suitability for their particular purpose.

(3) CSA Standards are subject to periodic review, and suggestions for their improvement will be referred to the appropriate committee.

(4) All enquiries regarding this Standard, including requests for interpretation, should be addressed to Canadian Standards Association. Standards Development. 178 Rexdale Boulevard. Rcxdale. Ontario M9W 1R3.

Requests for interpretation should

(a) define the problem, making reference to the specific clause, and. where appropriate,include anillustrativesketch;

(b) provide an explanation of circumstances surrounding the actual field condition; and

(c) be phrased where possible to permit a specific "yes" or "no" answer.

Interpretations arc published in CSA's periodical Info Update, Foi suhxenption details,wnteto CSASnlcsPromotion. Info Update, at the address given above.