ANSI-UL 60950-2000 Safety of Information Technology Equipment.pdf

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1、UL 60950ISBN 0-7629-0470-4Safety of InformationTechnology EquipmentUnderwriters Laboratories Inc. (UL)333 Pfingsten RoadNorthbrook, IL 60062-2096UL Standard for Safety for Information Technology Equipment, UL 60950Third Edition, Dated December 1, 2000Announcement Bulletin(s): This Standard contains

2、the announcement bulletin(s) dated July 23, 1999. Theannouncement bulletin is located at the end of the Standard.As indicated on the title page (page 1), this UL Standard for Safety is an American National Standard.Attention is directed to the note on the back side of the title page (page 2) of this

3、 Standard outlining theprocedures to be followed to retain the approved text of this ANSI/UL Standard.As indicated on the back side of the title page (page 2), this UL Standard for Safety has been adopted bythe Department of Defense.The master for this Standard at ULs Northbrook Office is the offici

4、al document insofar as it relates to aUL service and the compliance of a product with respect to the requirements for that product and service,or if there are questions regarding the accuracy of this Standard.ULs Standards for Safety are copyrighted by UL. Neither a printed copy of a Standard, nor t

5、he distributiondiskette for a Standard-on-Diskette and the file for the Standard on the distribution diskette should bealtered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding thoseStandards shall remain the sole and exclusive property of UL.All rights reserved.

6、No part of this publication may be reproduced, stored in a retrieval system, ortransmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwisewithout prior permission of UL.Revisions of UL Standards for Safety are issued from time to time. A UL Standard for Safety

7、is currentonly if it incorporates the most recently adopted revisions.UL provides this Standard as is without warranty of any kind, either expressed or implied, including butnot limited to, the implied warranties of merchantability or fitness for any purpose.In no event will UL be liable for any spe

8、cial, incidental, consequential, indirect or similar damages,including loss of profits, lost savings, loss of data, or any other damages arising out of the use of or theinability to use this Standard, even if UL or an authorized UL representative has been advised of thepossibility of such damage. In

9、 no event shall ULs liability for any damage ever exceed the price paid forthis Standard, regardless of the form of the claim.UL will attempt to answer support requests concerning electronic versions of its Standards. However, thissupport service is offered on a reasonable efforts basis only, and UL

10、 may not be able to resolve everysupport request. UL supports the electronic versions of its Standards only if they are used under theconditions and operating systems for which it is intended. ULs support policies may change fromtime-to-time without notification.UL reserves the right to change the f

11、ormat, presentation, file types and formats, delivery methods andformats, and the like of both its printed and electronic Standards without prior notice.DECEMBER 1, 2000 UL 60950 tr1Purchasers of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and holdUL harmless from

12、 and against any loss, expense, liability, damage, claim, or judgement (includingreasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing anelectronic Standard on the purchasers computer system.If a single-user version electronic Standard was purchased,

13、one copy of this Standard may be stored onthe hard disk of a single personal computer, or on a single LAN file-server or the permanent storagedevice of a multiple-user computer in such a manner that this Standard may only be accessed by one userat a time and for which there is no possibility of mult

14、iple concurrent access.If a multiple-user version electronic Standard was purchased, one copy of the Standard may be stored ona single LAN file-server, or on the permanent storage device of a multiple-user computer, or on an Intranetserver. The number of concurrent users shall not exceed the number

15、of users authorized.Electronic Standards are intended for on-line use, such as for viewing the requirements of a Standard,conducting a word search, and the like. Only one copy of the Standard may be printed from eachsingle-user version of an electronic Standard. Only one copy of the Standard may be

16、printed for eachauthorized user of a multiple-user version of an electronic Standard. Because of differences in thecomputer/software/printer setup used by UL and those of electronic Standards purchasers, the printedcopy obtained by a purchaser may not look exactly like the on-line screen view or the

17、 printed Standard.An employee of an organization purchasing a UL Standard can make a copy of the page or pages beingviewed for their own fair and/or practical internal use.The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, figures,and/or other element

18、s of the Standard having future effective dates as indicated in the note following theaffected item. The prior text for requirements that have been revised and that have a future effective dateare located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice.New product submittals

19、 made prior to a specified future effective date will be judged under all of therequirements in this Standard including those requirements with a specified future effective date, unlessthe applicant specifically requests that the product be judged under the current requirements. However, ifthe appli

20、cant elects this option, it should be noted that compliance with all the requirements in thisStandard will be required as a condition of continued Listing, Recognition, and Follow-Up Services afterthe effective date, and understanding of this should be signified in writing.Copyright 2000 Underwriter

21、s Laboratories Inc.This Standard consists of pages dated as shown in the following checklist:Page Date1-430 .December 1, 2000DECEMBER 1, 2000 UL 60950tr2Safety of Information Technology EquipmentDecember 1, 2000This national standard is based on publication IEC 60950, Third Edition (1999).CSA Intern

22、ationalCAN/CSA-C22.2 No. 60950-00Third EditionUnderwriters Laboratories Inc.UL 60950Third EditionANSI/UL 60950-2000Commitment for AmendmentsThis Standard is issued jointly by CSA International and UnderwritersLaboratories Incorporated. Amendments to this Standard will be made only afterprocessing ac

23、cording to the Standards writing procedures by both CSAInternational and Underwriters Laboratories Incorporated.Revisions of this Standard will be made by issuing revised or additional pagesbearing their date of issue. A UL Standard is current only if it incorporates themost recently adopted revisio

24、ns, all of which are itemized on the transmittal noticethat accompanies the latest set of revised requirements.Approval of UL 60950 as an AmericanNational Standard is maintained usingthe continuous maintenance process.Comments or proposals for revisionson any part of the Standard may besubmitted to

25、UL at any time. Writtencomments are to be sent to theUL-SC Standards Department, 1655Scott Blvd., Santa Clara, CA 95050.The most recent approval of UL60950 as an American NationalStandard (ANSI) occurred on October11, 2000 and covers the Third Edition.The U.S. Department of Defense(DoD) has adopted

26、UL 1950 onDecember 21, 1994. The publicationof revised pages or a new edition ofthis Standard will not invalidate theDoD adoption.ISBN 1-55324-222-XCopyright 2000CSA InternationalAll rights reserved. No part of thispublication may be reproduced in anyform whatsoever without the priorpermission of th

27、e publisher.ISBN 0-7629-0470-4Copyright 2000Underwriters Laboratories Inc.CONTENTSPREFACE .10FOREWORD (CSA) .13FOREWORD (UL) .14FOREWORD .15INTRODUCTION .170 Principles of safety .170.1 General principles of safety .170.2 Hazards .180.3 Materials and components .221 General .231.1 Scope .231.2 Defin

28、itions .251.3 General requirements .371.4 General conditions for tests .391.5 Components .441.6 Power interface .471.7 Markings and instructions .482 Protection from hazards .562.1 Protection from electric shock and energy hazards .562.2 SELV circuits .642.3 TNV circuits .672.4 Limited current circu

29、its .722.5 Limited power sources .742.6 Provisions for earthing and bonding .762.7 Overcurrent and earth fault protection in primary circuits .852.8 Safety interlocks .882.9 Electrical insulation .912.10 Clearances, creepage distances and distances through insulation .973 Wiring, connections and sup

30、ply .1183.1 General .1183.2 Connection to a.c. mains supplies .1223.3 Wiring terminals for connection of external conductors .1293.4 Disconnection from the a.c. mains supply .1333.5 Interconnection of equipment .1363.6 Special considerations for equipment connected to a centralized d.c. powersystem

31、DC mains voltages .1374 Physical requirements .1384.1 Stability .1384.2 Mechanical strength .1394.3 Design and construction .1444.4 Protection against hazardous moving parts .1504.5 Thermal requirements .1524.6 Openings in enclosures .1554.7 Resistance to fire .1645 Electrical requirements and simul

32、ated abnormal conditions .172DECEMBER 1, 2000 CAN/CSA-C22.2 NO. 60950-00 UL 60950 3DEDEDED2D25.1 Touch current and protective conductor current .1725.2 Electric strength .1825.3 Abnormal operating and fault conditions .1866 Connection to telecommunication networks .1916.1 Protection of telecommunica

33、tion network service personnel, and users of otherequipment connected to the network, from hazards in the equipment .1916.2 Protection of equipment users from overvoltages on telecommunicationnetworks .1946.3 Protection of the telecommunication wiring system from overheating .1986.4 Protection again

34、st overvoltage from power line crosses .1996.5 Acoustic tests .202Annex A (normative) Tests for resistance to heat and fireA.1 Flammability test for fire enclosures of movable equipment having a total massexceeding 18 kg, and of stationary equipment (see 4.7.3.2) .206A.1.1 Samples .206A.1.2 Conditio

35、ning of samples .206A.1.3 Mounting of samples .207A.1.4 Test flame .207A.1.5 Test procedure .207A.1.6 Compliance criteria .207A.2 Flammability test for fire enclosures of movable equipment having a total mass notexceeding 18 kg, and for material and components located inside fire enclosures (see4.7.

36、3.2 and 4.7.3.4) .207A.2.1 Samples .207A.2.2 Conditioning of samples .208A.2.3 Mounting of samples .208A.2.4 Test flame .208A.2.5 Test procedure .208A.2.6 Compliance criteria .209A.2.7 Alternative test .209A.3 High current arcing ignition test (see 4.7.3.2) .209A.3.1 Samples .209A.3.2 Test circuit .

37、209A.3.3 Test electrodes .210A.3.4 Test procedure .211A.3.5 Compliance criteria .211A.4 Hot wire ignition test (see 4.7.3.2) .211A.4.1 Samples .211A.4.2 Test circuit .211A.4.3 Mounting of samples .211A.4.4 Test procedure .212A.4.5 Compliance criterion .213A.5 Hot flaming oil test (see 4.6.2) .213A.5.1 Mounting of samples .