UL 60950-1-2007 UL Standard for Safety Information Technology Equipment C Safety C Part 1 General Requirements (Second Edition Reprint with Revisions Through and Including OCTOBER .pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 60950-1 Information Technology Equipment Safety Part 1: General RequirementsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYR

2、IGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Information Technology Equipment Safety Part 1: General Requirements, UL 60950-1 Second Edition, Dated March 27, 2007 Summary of Topics This revision of UL 60950-1 is being i

3、ssued to incorporate the following: Proposed Revisions to Align with Amendment 2 and Corrigendum 1 to IEC 60950-1 Annexes P.1 and P.2 - Proposals Needed to Address the Editorial Maintenance of the Standard Updated References Based on the Latest Versions of the National Electrical Code (NEC) and the

4、Canadian Electrical Code (CEC) UL 60950-1 is an adoption of IEC 60950-1, Information Technology Equipment Safety Part 1: General Requirements (Second Edition, issued December 2005, including Amendment 1 issued December 2009 and Amendment 2 issued May 2013). Text that has been changed in any manner o

5、r impacted by ULs electronic publishing system is marked with a vertical line in the margin. In the revisions dated October 14, 2014 pages 177 and 178 have been intentionally deleted from the Standard due to the deletion or relocation of text. The new and/or revised requirements are substantially in

6、 accordance with Proposal(s) on this subject dated June 13, 2014. 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 not invalidate the DoD adoption. All rights reserved. No part of this publication m

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11、OBER 14, 2014 UL 60950-1 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 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 effect

12、ive dates as indicated in the preface. The prior text for requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. OCTOBER 14, 2014 UL 60950-1 tr2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER

13、REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Information Technology Equipment Safety Part 1: General Requirements March 27, 2007 (Title Page Reprinted: October 14, 2014) This national standard is based on publication IEC 60950-1, Second Edition (2005), including Amendment 1 (2009) and Ame

14、ndment 2 (2013). CSA Group Amendment 2:2014 (MOD) to National Standard of Canada CAN/CSA-C22.2 No. 60950-1-07 Second Edition (IEC 60950-1: 2005, MOD) Approved by Underwriters Laboratories Inc. UL 60950-1 Second Edition ANSI/UL 60950-1-2014UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTI

15、ON OR DISTRIBUTION WITHOUT PERMISSION FROM UL Commitment for Amendments This standard is issued jointly by the Canadian Standards Association (operating as “CSA Group”) and Underwriters Laboratories Inc. (UL). Comments or proposals for revisions on any part of the standard may be submitted to CSA Gr

16、oup or UL at anytime. Revisions to this standard will be made only after processing according to the standards development procedures of CSA Group and UL. CSA Group and UL will issue revisions to this standard by means of a new edition or revised or additional pages bearing their date of issue. _ Al

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20、arding those Standards shall remain the sole and exclusive property of UL. This ANSI/UL Standard for Safety consists of the Second Edition including revisions through October 14, 2014. The most recent designation of ANSI/UL 60950-1 as an American National Standard (ANSI) occurred on October 14, 2014

21、. 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 approval of IEC-based standards. Comments or proposals for revisions on any part of the Standa

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23、l rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher. Copyright 2014 Underwriters Laboratories Inc.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS PREF

24、ACE 8 FOREWORD 11 INTRODUCTION . 14 0 Principles of safety 14 0.1 General principles of safety 14 0.2 Hazards .16 0.3 Materials and components .20 1 General 21 1.1 Scope .21 1.2 Denitions 22B 1.3 General requirements 38A 1.4 General conditions for tests 40 1.5 Components .46 1.6 Power interface .54

25、1.7 Markings and instructions 56 2 Protection from hazards 65 2.1 Protection from electric shock and energy hazards 65 2.2 SELV circuits .76 2.3 TNV circuits 79 2.4 Limited current circuits 85 2.5 Limited power sources .86A 2.6 Provisions for earthing and bonding .88 2.7 Overcurrent and earth fault

26、protection in primary circuits .98 2.8 Safety interlocks .101 2.9 Electrical insulation 105 2.10 Clearances, creepage distances and distances through insulation 112 3 Wiring, connections and supply 146 3.1 General 146 3.2 Connection to a mains supply .151 3.3 Wiring terminals for connection of exter

27、nal conductors .159 3.4 Disconnection from the mains supply 164 3.5 Interconnection of equipment 167 4 Physical requirements 168 4.1 Stability .168 4.2 Mechanical strength 169 4.3 Design and construction 176 4.4 Protection against hazardous moving parts .190 4.5 Thermal requirements 190C 4.6 Opening

28、s in enclosures 194 4.7 Resistance to re 205 5 Electrical requirements and simulated abnormal conditions 215 5.1 Touch current and protective conductor current .215 5.2 Electric strength .227 5.3 Abnormal operating and fault conditions 231 6 Connection to telecommunication networks 236 6.1 Protectio

29、n of telecommunication network service persons, and users of other equipment connected to the network, from hazards in the equipment 236 OCTOBER 14, 2014 CAN/CSA-C22.2 NO. 60950-1-07 UL 60950-1 3 DEUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FRO

30、M UL 6.2 Protection of equipment users from overvoltages on telecommunication networks 239 6.3 Protection of the telecommunication wiring system from overheating .242 6.4 Protection against overvoltage from power line crosses 243 7 Connection to cable distribution systems 246 7.1 General 246 7.2 Pro

31、tection of cable distribution system service persons, and users of other equipment connected to the system, from hazardous voltages in the equipment 246 7.3 Protection of equipment users from overvoltages on the cable distribution system .247 7.4 Insulation between primary circuits and cable distrib

32、ution systems .247 Annex A (normative) Tests for resistance to heat and re A.1 Flammability test for re enclosures of movable equipment having a total mass exceeding 18 kg and of stationary equipment (see 4.7.3.2) .250 A.2 Flammability test for re enclosures of movable equipment having a total mass

33、not exceeding 18 kg, and for material and components located inside re enclosures (see 4.7.3.2 and 4.7.3.4) .251 A.3 Hot aming oil test (see 4.6.2) 253 Annex B (normative) Motor tests under abnormal conditions (see 4.7.2.2 and 5.3.2) B.1 General requirements 254 B.2 Test conditions 254 B.3 Maximum t

34、emperatures 255 B.4 Running overload test 256 B.5 Locked-rotor overload test 257 B.6 Running overload test for d.c. motors in secondary circuits .258 B.7 Locked-rotor overload test for d.c. motors in secondary circuits .259 B.8 Test for motors with capacitors 260 B.9 Test for three-phase motors 260

35、B.10 Test for series motors .260 Annex C (normative) Transformers (see 1.5.4 and 5.3.3) C.1 Overload test 261 C.2 Insulation .263 Annex D (normative) Measuring instruments for touch-current tests (see 5.1.4) D.1 Measuring instrument .265 D.2 Alternative measuring instrument .266 MARCH 27, 2007 CAN/C

36、SA-C22.2 NO. 60950-1-07 UL 60950-1 4 D2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Annex E (normative) Temperature rise of a winding (see 1.4.13) Annex F (normative) Measurement of clearances and creepage distances (see 2.10 and Annex G)

37、 Annex G (normative) Alternative method for determining minimum clearances G.1 Clearances 279 G.1.1 General 279 G.1.2 Summary of the procedure for determining minimum clearances 279 G.2 Determination of mains transient voltage .280 G.2.1 AC mains supply 280 G.2.2 Earthed d.c. mains supplies .281 G.2

38、.3 Unearthed d.c. mains supplies 281 G.2.4 Battery operation 281 G.3 Determination of telecommunication network transient voltage .281 G.4 Determination of required withstand voltage 282 G.4.1 Mains transients and internal repetitive peaks .282 G.4.2 Transients from telecommunication networks .283 G

39、.4.3 Combination of transients .283 G.4.4 Transients from cable distribution systems 283 G.5 Measurement of transient voltage levels 284 G.6 Determination of minimum clearances .284A Annex H (normative) Ionizing radiation (see 4.3.13) Annex J (normative) Table of electrochemical potentials (see 2.6.

40、5.6) Annex K (normative) Thermal controls (see 1.5.3 and 5.3.8) K.1 Making and breaking capacity .291 K.2 Thermostat reliability 291 K.3 Thermostat endurance test 292 K.4 Temperature limiter endurance .292 K.5 Thermal cut-out reliability 292 K.6 Stability of operation 292 Annex L (normative) Normal

41、load conditions for some types of electrical business equipment (see 1.2.2.1 and 4.5.2) L.1 Typewriters 293 L.2 Adding machines and cash registers 293 L.3 Erasers .293 L.4 Pencil sharpeners 293 L.5 Duplicators and copy machines 294 L.6 Motor-operated les 294 L.7 Other business equipment .295 MARCH 2

42、7, 2007 CAN/CSA-C22.2 NO. 60950-1-07 UL 60950-1 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Annex M (normative) Criteria for telephone ringing and other signals(see 2.3.1) M.1 Introduction .296 M.2 Method A .296 M.3 Method B .300 M.3.1

43、Ringing signal .300 M.3.2 Tripping device and monitoring voltage .301 M.4 Other telecommunication signals .303 Annex N (normative) Impulse test generators(see 1.5.7.2, 1.5.7.3, 2.10.3.9, 6.2.2.1, 7.4.2, 7.4.3 and Clause G.5) N.1 ITU-T impulse test generators .305 N.2 IEC 60065 impulse test generator

44、 306 Annex P (normative) Normative references P.1 UL and CSA Component Requirements (mandatory) .313 P.2 UL and CSA Component Requirements (alternative) .317 Annex Q (normative) Voltage dependent resistors (VDRs)(see 1.5.9.1) Annex R (informative) Examples of requirements for quality control program

45、mes R.1 Minimum separation distances for unpopulated coated printed boards (see 2.10.6.2) .326A R.2 Reduced clearances (see 2.10.3) 327 Annex S (informative) Procedure for impulse testing(see 6.2.2.3) S.1 Test equipment 329 S.2 Test procedure .329 S.3 Examples of waveforms during impulse testing 329

46、 Annex T (informative) Guidance on protection against ingress of water(see 1.1.2) Annex U (normative) Insulated winding wires for use without interleaved insulation(see 2.10.5.4) U.1 General .334 U.2 Type tests .334 U.2.1 General 334 U.2.2 Electric strength .334 U.2.3 Flexibility and adherence 334B

47、U.2.4 Heat shock 334B U.2.5 Retention of electric strength after bending .335 OCTOBER 14, 2014 CAN/CSA-C22.2 NO. 60950-1-07 UL 60950-1 6 DE D2 DC DCUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL U.3 Testing during manufacture .335 U.3.1 Gen

48、eral 335 U.3.2 Routine test .336 U.3.3 Sampling test .336 Annex V (normative) A.C. power distribution systems(see 1.6.1) V.1 Introduction 338 V.2 TN power distribution systems .339 V.3 TT power distribution systems .342 V.4 IT power distribution systems 344 Annex W (informative) Summation of touch c

49、urrents W.1 Touch current from electronic circuits 346 W.1.1 Floating circuits .346 W.1.2 Earthed circuits .347 W.2 Interconnection of several equipments .348 W.2.1 Isolation 349 W.2.2 Common return, isolated from earth .350 W.2.3 Common return, connected to protective earth 350 Annex X (informative) Maximum heating effect in