ANSI UL 60950-21-2003 UL Standard for Safety Information Technology Equipment - Safety - Part 21 Remote Power Feeding (First Edition Reprint with revisions through and including Ja.pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 60950-21 Information Technology Equipment Safety Part 21: Remote Power FeedingUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COP

2、YRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Information Technology Equipment Safety Part 21: Remote Power Feeding, UL 60950-21 First Edition, Dated November 10, 2003 Summary of Topics This revision of ANSI/UL 60950-2

3、1 is being issued to reaffirm approval as an American National Standard. No changes in requirements are involved As noted in the Commitment for Amendments statement located on the back side of the title page, UL and CSA are committed to updating this harmonized standard jointly. However, the revisio

4、n pages dated January 31, 2012 will not be jointly issued by UL and CSA as these revision pages only address UL ANSI approval dates. UL 60950-21 is an adoption of IEC 60950-21, Information Technology Equipment Safety Part 21: Remote Power Feeding (First Edition, issued December 2002). Text that has

5、been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated October 28, 2011 and January 5, 2012. All rights reserved. No part of this

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10、r system. The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the preface. The prior text for requirements that have been revised and that have a future effectiv

11、e date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. JANUARY 31, 2012 UL 60950-21 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 31, 2012 UL 60950-21 tr2 No Text on This PageUL COPYRIGHTED

12、MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Information Technology Equipment Safety Part 21: Remote Power Feeding November 10, 2003 (Title page reprinted: January 31, 2012) This national standard is based on publication IEC 60950-21, First Edition (200

13、2). Canadian Standards Association CAN/CSA-C22.2 No. 60950-21-03 First Edition (IEC 60950-21: 2002, MOD) Underwriters Laboratories Inc. UL 60950-21 First Edition ANSI/UL 60950-21-2007 (R2012)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Co

14、mmitment for Amendments This standard is issued jointly by the Canadian Standards Association (CSA) and Underwriters Laboratories Inc. (UL). Comments or proposals for revisions on any part of the standard may be submitted to CSA or UL at any time. Revisions to this standard will be made only after p

15、rocessing according to the standards development procedures of CSA and UL. CSA and UL will issue revisions to this standard by means of a new edition or revised or additional pages bearing their date of issue. _ CSA Standards are subject to periodic review, and suggestions for their improvement will

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18、ed in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. This ANSI/UL Standard for Safety consists of the First Edition including revisions through January 31, 2012. The most recent designation of ANS

19、I/UL 60950-21 as a Reaffirmed American National Standard (ANS) occurred on January 31, 2012. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page (front and back), or the Preface. The National Difference Page and IEC Foreword are also excluded from the ANSI app

20、roval of IEC-based standards. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. To purchase UL Standards, visit Comm 2000

21、 at http:/m- or call toll-free 1-888-853-3503. ISBN 1-55397-503-0 Copyright 2003 Canadian Standards Association All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher. Copyright 2012 Underwriters Laboratories Inc.UL COP

22、YRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS PREFACE 4 FOREWORD .8 INTRODUCTION . 10 1 Scope .11 2 Normative references 11 3 Denitions 11 4 General requirements 12 4.1 Power from a telecommunication network (see also 1.4.11 of IEC 6095

23、0-1 ) .12 4.2 Access to energized parts (see also 2.1.1.1 of IEC 60950-1) .12 4.3 Protection in service access areas (see also 2.1.2 of IEC 60950-1) .12 4.4 Protection in restricted access locations (see also 2.1.3 of IEC 60950-1) 13 4.5 Interconnection of equipment .13 5 Connection to telecommunica

24、tion networks .13 6 Remote power feeding .14 6.1 RFT-C circuit limits 14 6.2 RFT-V circuit limits 16 6.3 Separation from other circuits and parts .18 6.4 Installation instructions 18 Annex A (informative) Remote power feeding 1 A.1 Overview .20 A.2 Operational considerations .20 A.3 Safety considera

25、tions 21 A.4 Principle of remote power feeding .22 A.4.1 RFT-C circuits 22 A.4.2 RFT-V circuits 23 A.5 Safety aspects 24 A.5.1 Steady-state body current 24 A.5.2 Body resistance 25 A.5.3 Charged capacitance 25 Annex B (Informative) Bibliography APRIL 23, 2007 CAN/CSA-C22.2 NO. 60950-21-03 UL 60950-2

26、1 3 DEUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PREFACE This is the common CSA and UL Standard for Information Technology Equipment Safety Part 21: Remote Power Feeding. It is the rst edition of CAN/CSA-C22.2 No. 60950-21 and the rst e

27、dition of UL 60950-21. This standard is based on IEC 60950-21, rst edition. This common standard was prepared by the Canadian Standards Association (CSA) and Underwriters Laboratories Inc. (UL). The efforts and support of representatives of leading industry companies and organizations are gratefully

28、 acknowledged. This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard. This Standard was reviewed by the CSA Subcommittee on Safety of Electronic Equipment within the Field of Audio/Video, Information, and Communication Technology, under the ju

29、risdiction of the Technical Committee on Consumer and Commercial Products and the CSA Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the CSA Technical Committee. This Standard has been approved as a National Standard of Canada by the Standards C

30、ouncil of Canada. This Standard has been approved by the American National Standards Institute (ANSI) as an American National Standard. Note: Although the intended primary application of this Standard is stated in its Scope, it is important to note that it remains the responsibility of the users of

31、the Standard to judge its suitability for their particular purpose. Level of harmonization This standard adopts the IEC text with national differences. This standard is published as an equivalent standard for CSA and UL. An equivalent standard is a standard that is substantially the same in technica

32、l content, except as follows: Technical national differences are allowed for codes and governmental regulations as well as those recognized as being in accordance with NAFTA Article 905, for example, because of fundamental climatic, geographical, technological, or infrastructural factors, scientic j

33、ustication, or the level of protection that the country considers appropriate. Presentation is word for word except for editorial changes. All national differences from the IEC text are included in the CSA and UL versions of the standard. While the technical content is the same in each organizations

34、 version, the format and presentation may differ. Reasons for differences from IEC The national differences in this binational Part 21 Standard are included to reference the binational version of IEC 60950-1, which is designated as CAN/CSA-C22.2 No. 60950-1/UL 60950-1 and to address issues related t

35、o references to the rst and second editions of CSA/UL 60950-1. APRIL 23, 2007 CAN/CSA-C22.2 NO. 60950-21-03 UL 60950-21 4 DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DEUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR D

36、ISTRIBUTION WITHOUT PERMISSION FROM UL Interpretations The interpretation by the standards development organization of an identical or equivalent standard is based on the literal text to determine compliance with the standard in accordance with the procedural rules of the standards development organ

37、ization. If more than one interpretation of the literal text has been identied, a revision is to be proposed as soon as possible to each of the standards development organizations to more accurately reect the intent. CSA effective date The effective date for CSA International will be announced throu

38、gh CSA Informs or a CSA certication notice. UL effective date The effective date for UL is available on ULs website at . General National differences from the text of the International Electrotechnical Commission (IEC) Publication 60950-21, Information Technology Equipment Safety Part 21: Remote Pow

39、er Feeding, Copyright 2002, are indicated by the following margin notations: There are six types of national differences, as noted below. The national difference type is noted in the margin next to the affected text. The standard may not include all types of these national differences. D1 national d

40、ifferences based on national regulatory requirements which result in equivalent or more stringent requirements than in IEC 60950-21. D2 national differences based on other than national regulatory requirements which result in equivalent or more stringent requirements than in IEC 60950-21. DI nationa

41、l differences based on IEC nal draft international standards (FDIS). DI national differences may be less stringent than, equivalent to, or more stringent than requirements in IEC 60950-21. DC national differences based on UL and CSA component requirements. DC national differences may be less stringe

42、nt than, equivalent to, or more stringent than component requirements in IEC 60950-21. D3 national differences based on binational requirements which result in less stringent requirements than in IEC 60950-21. DE editorial national differences that correct typographical errors in IEC 60950-21 or rev

43、ise the terminology, but do not alter the technical intent of the requirements. This notation is also used for informative statements such as the Preface and Foreword. National differences have been incorporated into the body of the standard. If national differences necessitate the deletion of IEC 6

44、0950-21 text, the IEC 60950-21 text has been retained but has been lined out. Text added as a result of national differences has been underlined. Text added as the Preface is not underlined. APRIL 23, 2007 CAN/CSA-C22.2 NO. 60950-21-03 UL 60950-21 5 DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE

45、 DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DE DEUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL The text, gures, and tables of International Electrotechnical Commission Publication 60950-21, Information Technology Equipment Sa

46、fety Part 21: Remote Power Feeding, Copyright 2002, are used in this standard with the consent of the International Electrotechnical Commission. The International Electrotechnical Commission Foreword and Introduction are not a part of the requirements of this standard but are included for informatio

47、n purposes only. APRIL 23, 2007 CAN/CSA-C22.2 NO. 60950-21-03 UL 60950-21 6 DE DE DE DE DEUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This page intentionally left blank. APRIL 23, 2007 CAN/CSA-C22.2 NO. 60950-21-03 UL 60950-21 7UL COPYRI

48、GHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This page intentionally left blank. APRIL 23, 2007 CAN/CSA-C22.2 NO. 60950-21-03 UL 60950-21 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTERNATIONAL ELECTROTECHNICAL COMMISSION INFORMATION TECHNOLOGY EQUIPMENT SAFETY Part 21: Remote power feeding FOREWORD 1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC Na