1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL 60950ISBN 0-7629-0470-4Safety of InformationTechnology EquipmentUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL
2、 NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUnderwriters Laboratories Inc. (UL)333 Pfingsten RoadNorthbrook, IL 60062-2096UL Standard for Safety for Information Technology Equipment, UL 60950Third Edition, Dated December 1, 2000Revisions: This Standard contains
3、revisions through and including October 30, 2007.Summary of TopicsThese revisions are being issued solely to remove the ANSI approval information fromthe title page, transmittal page and the preface.As noted in the Commitment for Amendments statement located on the back side of thetitle page, UL and
4、 CSA are committed to updating this binational standard jointly.However, the revision pages dated October 30, 2007 will not be jointly issued by UL andCSA. CSA will not be issuing revision pages because this edition has been supersededby a subsequent edition of the standard.UL Standards for Safety a
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23、otice.New product submittals 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 requir
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25、g.Copyright 2007 Underwriters Laboratories Inc.OCTOBER 30, 2007 UL 60950tr2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULThis Standard consists of pages dated as shown in the following checklist:Page Date1-2 October 30, 20073-9 .December 1,
26、200010.October 30, 200711-12 .December 1, 200013-14March 15, 200215-67 .December 1, 200068.March 15, 200269-130 December 1, 2000131March 15, 2002132-136 .December 1, 2000137March 15, 2002138-178 .December 1, 2000179October 30, 2007180March 15, 2002181-188 .December 1, 2000189March 15, 2002190-198 .D
27、ecember 1, 2000199October 30, 2007200-203 .December 1, 2000204October 30, 2007205-234 .December 1, 2000235March 15, 2002236-274 .December 1, 2000275-277March 15, 2002278.December 1, 2000279March 15, 2002280.December 1, 2000281March 15, 2002282-428 .December 1, 2000429-430 October 30, 2007OCTOBER 30,
28、 2007 UL 60950 tr3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULOCTOBER 30, 2007 UL 60950tr4No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSafety of Information Te
29、chnology EquipmentDecember 1, 2000(Title page reprinted: October 30, 2007)This national standard is based on publication IEC 60950, Third Edition (1999).Canadian Standards AssociationCAN/CSA-C22.2 No. 60950-00Third EditionUnderwriters Laboratories Inc.UL 60950Third EditionUL COPYRIGHTED MATERIAL NOT
30、 AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCommitment for AmendmentsThis Standard is issued jointly by the Canadian Standards Association andUnderwriters Laboratories Incorporated. Amendments to this Standard will bemade only after processing according to the Stand
31、ards writing procedures byboth the Canadian Standards Association and Underwriters LaboratoriesIncorporated.The following paragraphs regarding revisions and DoD adoption apply only to theUL Standard:Revisions of this Standard will be made by issuing revised or additional pagesbearing their date of i
32、ssue. A UL Standard is current only if it incorporates themost recently adopted revisions, all of which are itemized on the transmittal noticethat accompanies the latest set of revised requirements. Comments or proposalsfor revisions on any part of the Standard may be submitted to UL at any time.Pro
33、posals should be submitted via a Proposal Request in ULs On-LineCollaborative Standards Development System (CSDS) at http:/.The U.S. Department of Defense (DoD) has adopted UL 1950 on December 21,1994. The publication of revised pages or a new edition of this Standard will notinvalidate the DoD adop
34、tion.ISBN 1-55324-222-XCopyright 2000Canadian Standards AssociationAll rights reserved. No part of thispublication may be reproduced in anyform whatsoever without the priorpermission of the publisher.ISBN 0-7629-0470-4Copyright 2000, 2007Underwriters Laboratories Inc.UL COPYRIGHTED MATERIAL NOT AUTH
35、ORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSPREFACE .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 Definitions
36、.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 circuits 722.5 Li
37、mited 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 supply 1183.1 Gener
38、al 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 DC mains voltages 1
39、374 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 simulated abnormal conditions 1
40、72DECEMBER 1, 2000 CAN/CSA-C22.2 NO. 60950-00 UL 60950 3DEDEDED2D2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL5.1 Touch current and protective conductor current .1725.2 Electric strength .1825.3 Abnormal operating and fault conditions 1866
41、 Connection to telecommunication networks 1916.1 Protection of telecommunication 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
42、 telecommunication wiring system from overheating .1986.4 Protection against 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 o
43、f stationary equipment (see 4.7.3.2) .206A.1.1 Samples 206A.1.2 Conditioning 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
44、 for material and components located inside fire enclosures (see4.7.3.2 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
45、 test (see 4.7.3.2) 209A.3.1 Samples 209A.3.2 Test circuit 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 criter
46、ion .213A.5 Hot flaming oil test (see 4.6.2) .213A.5.1 Mounting of samples .213A.5.2 Test procedure 213A.5.3 Compliance criterion .213A.6 Flammability tests for classifying materials V-0, V-1 or V-2 213A.6.1 Samples 213A.6.2 Conditioning of samples 214A.6.3 Mounting of samples .214DECEMBER 1, 2000CA
47、N/CSA-C22.2 NO. 60950-00 UL 609504D2D2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULA.6.4 Test procedure 214A.6.5 Compliance criteria 215A.6.6 Permitted retest .215A.7 Flammability test for classifying foamed materials HF-1, HF-2 or HBF 215A
48、.7.1 Samples 215A.7.2 Conditioning of samples 216A.7.3 Test procedure 216A.7.4 Compliance criteria 216A.7.5 Compliance criteria, HF-2 .217A.7.6 Compliance criteria, HF-1 .217A.7.7 Compliance criteria, HBF .217A.7.8 Permitted retest, HF-1 or HF-2 217A.7.9 Permitted retest, HBF 218A.8 Flammability tes
49、t for classifying materials HB 218A.8.1 Samples 218A.8.2 Conditioning of samples 218A.8.3 Mounting of samples .218A.8.4 Test procedure 219A.8.5 Compliance criteria 220A.8.6 Permitted retest .220A.9 Flammability test for classifying materials 5V 220A.9.1 Samples 220A.9.2 Conditioning of samples 220A.9.3 Test flame 221A.9.4 Test procedure, test bars .221A.9.5 Test procedure, test plaques 222A.9.6 Compliance criteria 223A.9.7 Permitted retest .223A.10 Stress relief conditiioning (see 4.2.7) 223Annex B (normative) Motor tests under abnorm
