1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 508 Industrial Control Equipment STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTH
2、ORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Industrial Control Equipment, UL 508 Eighteenth Edition, Dated March 30, 2018 Summary of Topics This new edition of UL 508 includes the following topics: 1. Revision to the scope concerning function
3、al safety in UL 508. 2. Revision to enclosure requirements for Class 2 rated products. 3. Revisions to requirements covering polymeric enclosures that are connected to conduit. 4. Correcting the references to tables in UL 508 in the bonding conductor test. 5. Revisions to requirements covering the i
4、nsulating material dimensions. 6. Clarication of requirements covering transformers. 7. Clarication of requirements covering supply connections. 8. Revisions to requirements covering proximity switch wire size. 9. Addition of requirements covering a type of isolated secondary circuit. 10. Editorial
5、corrections to paragraphs 36.1 and 36.2 11. Revision to Table 37.1 to clarify the intent of footnote g. 12. Revisions to Tables 37.2, 37.3 and 37.6. 13. Editorial correction to Table 37.5. 14. Clarication of requirements covering crossover lead insulation. 15. Editorial correction to paragraph 38.1.
6、 16. Editorial correction to Table 38.1. 17. Adding a reference to Table 37.3 in paragraph 40.2. 18. Clarication of requirements covering the minimum temperature recording intervals. 19. Editorial corrections to paragraph 47.2. 20. Clarication of the requirements covering electronic ballasts. 21. Cl
7、arication of bus bar system short circuit testing. 22. Clarication of requirements covering short circuit testing of overload relays using inverse time circuit breakers for short circuit protective devices. MARCH 30, 2018 UL 508 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR D
8、ISTRIBUTION WITHOUT PERMISSION FROM UL 23. Clarication of requirements for short circuit testing of Type D combination motor controllers. 24. Standardization of high available fault values. 25. Clarication of the requirements covering high available fault current testing for stand alone overload rel
9、ay type devices. 26. Editorial correction in paragraph 55.1.1. 27. Editorial correction in paragraph 57.5.1. 28. Clarication of the requirements contained in Section 61, Strain Relief Test. 29. Clarication of requirements for breakdown of component testing. 30. Addition of bus bar system marking req
10、uirements. 31. Editorial corrections to Table 94.1. 32. Clarication of paragraph 102.2. 33. Additional dielectric test for reduced voltage solid state motor controllers. 34. Revision to the test procedure for reduced voltage solid state motor controllers. 35. Revision to enclosure requirements for p
11、ressure operated switches. 36. Revision to test method for conducting overload and endurance testing of the contacts in overload relays. 37. Additional requirement covering software and rmware critical to the operation of motor overload protection. 38. Revisions to requirements covering denite purpo
12、se controllers. 39. Clarication of the intent of the requirements for denite purpose controllers in electric heating applications. 40. Clarication of types of light sources covered by Section 226. 41. Revisions to Table 68.2 and Figure 68.1. 42. Revisions to requirements covering standard fault curr
13、ent circuits protective devices. 43. Revisions to requirements covering DC general purpose and resistance ratings. 44. Revisions to requirements covering the Breakdown of Components Test, Section 60. 45. Revisions to the dielectric voltage-withstand test. MARCH 30, 2018 UL 508 tr2UL COPYRIGHTED MATE
14、RIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL The new/revised requirements are substantially in accordance with Proposal(s) on this subject dated March 1, 2013 and August 16, 2013. All rights reserved. No part of this publication may be reproduced, stored in
15、 a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties o
16、f merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or
17、an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnif
18、y, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. MARCH 30, 2018 UL 508 tr3UL CO
19、PYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 30, 2018 UL 508 tr4 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 30, 2018 1 UL 508 Standard for Industri
20、al Control Equipment First Edition September, 1925 Second Edition March, 1928 Third Edition June, 1931 Fourth Edition February, 1933 Fifth Edition August, 1933 Sixth Edition May, 1934 Seventh Edition July, 1938 Eighth Edition May, 1956 Ninth Edition December, 1962 Tenth Edition September, 1964 Eleve
21、nth Edition August, 1971 Twelfth Edition May, 1977 Thirteenth Edition December, 1983 Fourteenth Edition August, 1984 Fifteenth Edition September, 1989 Sixteenth Edition February, 1993 Seventeenth Edition January, 1999 Eighteenth Edition March 30, 2018 This ANSI/UL Standard for Safety consists of the
22、 Eighteenth edition. The most recent designation of ANSI/UL 508 as an American National Standard (ANSI) occurred on March 30, 2018. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, and Title Page. The Department of Defense (DoD) has adopted UL 508 on June 5, 1989. The
23、 publication of revised pages or a new edition of this Standard will not invalidate the DoD adoption. 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 Develo
24、pment System (CSDS) at https:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of
25、UL. COPYRIGHT 2018 UNDERWRITERS LABORATORIES INC. ANSI/UL 508-2018UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 30, 2018 INDUSTRIAL CONTROL EQUIPMENT - UL 508 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER R
26、EPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope 16 2 Glossary 17 3 Units of Measurement 20 4 Components 20 5 Undated References .20 6 Installation and Operation Instructions 20 PART I ALL EQUIPMENT ENCLOSURE CONSTRUCTION 7 Frames and Enclosure .21 7.1 General 21
27、7.2 Cast metal21 7.3 Sheet metal 22 7.4 Doors and covers .26 7.5 Polymeric.30 7.6 Bonding 32 7.7 Resistance measurement.34 7.8 Openings in enclosure .34 7.9 Ventilating openings .35 7.10 Barriers used with ventilation openings36 7.11 Forced ventilation 37 7.12 Observation windows .37 7.13 Transforme
28、r or autotransformer 37 7.14 Motor controller wire bending space 37 7.15 Specic enclosures .38 7.16 Components for use on specic enclosures .41 7.17 Accessibility of live parts 41 8 Protection Against Corrosion 44 8.1 General 44 8.2 Outdoor enclosures 45 ENCLOSURE PERFORMANCE 9 General.45 10 Securem
29、ent of Snap-On Cover Test 46 INSTRUCTIONS AND MARKINGS PERTAINING TO ENCLOSURES 11 Permanence of Marking .47 12 Details.47 DEVICE CONSTRUCTION 13 General49 14 Protection Against Corrosion .49 MARCH 30, 2018 INDUSTRIAL CONTROL EQUIPMENT - UL 508 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REP
30、RODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 15 Provisions for Mounting49 16 Insulating Material 49 17 Means for Switching 52 18 Live Parts52 19 Protective Devices 53 19.1 General .53 19.2 Protection of internal primary and secondary control circuit conductors .53 19.3 Protection of control
31、circuit transformer .55 19.4 Low-voltage protection 56 19.5 Phase loss protection .57 19.6 Phase-reversal protection .57 20 Capacitors .57 21 Fuseholders57 22 Internal Wiring58 22.1 General .58 22.2 Routing of internal wiring 58 22.3 Clamps and guides .58 22.4 Flexing of internal wiring 58 22.5 Addi
32、tional insulation 59 22.6 Splices and connections 59 22.7 Splice insulation59 23 External Interconnections 60 23.1 Open equipment .60 23.2 Enclosed equipment 60 23.3 Interconnecting cords and cables 60 24 Transformers .61 25 Blower Motors 61 26 Supply Connections .61 26.1 General .61 26.2 Permanentl
33、y connected equipment .62 26.3 Tapped holes for conduit 62 26.4 Knockouts .62 26.5 Size of wiring terminals and leads 62 26.6 Evaluation of pressure wire connectors .63 26.7 Evaluation of quick connect terminals .64 26.8 Evaluation of wire binding screws 65 26.9 Evaluation of eld wiring leads .65 26
34、.10 Evaluation of spring type terminations .66 26.11 Cord-connected equipment .66 27 Cord-Connected Programming and Diagnostic Units 68 28 Coil Windings 68 29 Risk of Electric Shock .69 30 Risk of Fire 69 31 Lithium Battery Circuits 70 32 Non-Lithium Battery Circuits70 32.1 General .70 32.2 Primary
35、non-rechargeable .70 32.3 Secondary rechargeable/non-rechargeable 71 33 Isolated Secondary Circuits 71 33.1 General .71 33.2 Class 2 circuit requirements .74 33.3 Limited voltage/current circuit requirements74 33.4 Limited voltage circuit requirements 75 MARCH 30, 2018 INDUSTRIAL CONTROL EQUIPMENT -
36、 UL 508 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 33.5 Isolated power supply circuit requirements 75 33.6 Limited energy circuit requirements .76 33.7 Limiting impedance circuit requirements.76 33.8 Limited Power Source circuit requir
37、ements 78 34 Limited Voltage Primary Circuit .78 35 Separation of Circuits .78 36 Isolation Devices .79 37 Spacings 80 38 Insulating Barriers 86 39 Clamped Insulating Joints in Lieu of Spacings87 40 Clearance and Creepage Distances.88 41 Protection of Service Personnel 90 42 Grounding .91 42.1 Gener
38、al .91 42.2 Internal insulated bonding, grounding, and grounded circuit conductors .93 42.3 Transformer secondary grounding 93 43 Accessories 94 DEVICE PERFORMANCE 44 General94 45 Temperature Test.96 46 Overvoltage and Undervoltage Test104 47 Overload Test .105 48 Endurance Test .112 49 Endurance Te
39、st for Relays for Television Applications .114 50 Calibration Test .114 51 Dielectric Voltage-Withstand Test 116 51.1 General 116 51.2 Coils.117 51.3 Secondary circuits.117 52 Short Circuit Test General 118 52.1 General 118 52.2 Enclosure 120 52.3 Sample preparation .120 53 Standard Fault Current Ci
40、rcuits121 53.1 Protective devices .121 53.2 Sample selection for overload relay .124 53.3 Parameters .124 54 High-Available Fault Current Circuits (Optional) .127 54.1 General 127 54.2 Sample selection 128 54.3 Procedure 130 55 Group Installation (Optional) 131 55.1 General 131 55.2 Sample selection
41、 132 55.3 Group installation for standard fault circuit ratings .132 55.4 Group installation for high capacity short circuit ratings 132 56 Standard and High Fault Acceptance Criteria .133 57 Calibration of Test Circuits 134 57.1 Circuit characteristics 134 57.2 Alternating-current circuits 135 57.3
42、 Direct current circuits 139 MARCH 30, 2018 INDUSTRIAL CONTROL EQUIPMENT - UL 508 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 57.4 Instrumentation for test currents above 10,000 amperes .140 57.5 Calibration characteristics for protecti
43、ve device .141 58 Transient-Voltage-Surge Suppression Test .144 59 Accelerated Aging Test.146 60 Breakdown of Components Test.146 61 Strain Relief Test 147 62 Push-Back Relief Test147 63 Wire Flexing 147 64 Printed Wiring Board Abnormal Operation Test148 65 Secondary Circuits Test 148 65.1 General 1
44、48 65.2 Limited voltage/current secondary test .149 65.3 Limited energy secondary test 150 65.4 Isolated power supply capacity test150 65.5 Limited voltage secondary test .150 65.6 Limiting impedance test 150 66 Leakage Current Test 151 67 Protection Against Contact with Live Parts of Door Mounted C
45、omponents Test .154 68 Electronic Fluorescent Ballasts 154 DEVICE RATING 69 Details .157 MARKING 70 General 160 71 Wiring Terminal Markings.165 72 Cautionary Markings .167 INSTRUCTIONS AND MARKINGS PERTAINING TO ACCESSORIES 73 Details .169 74 Marking Location 169 MANUFACTURING AND PRODUCTION TESTS 7
46、5 Production-Line Dielectric Voltage-Withstand Test .176 76 Production-Line Grounding-Continuity Test .177 77 Production-Line Polarization-Continuity Test Cord and Plug Connected Equipment 178 PART II MAGNETIC MOTOR CONTROLLERS CONSTRUCTION 78 General 178 PERFORMANCE 79 General 178 RATING MARCH 30,
47、2018 INDUSTRIAL CONTROL EQUIPMENT - UL 508 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 80 Details .178 MARKING 81 Marking 178 PART III MANUAL MOTOR CONTROLLERS CONSTRUCTION 82 General 178 PERFORMANCE 83 General 179 84 Temperature Test18
48、1 85 Endurance Test (Motor Disconnect)181 86 Dielectric Voltage Withstand Test 182 87 Short Circuit Test (Motor Disconnect) 182 88 Voltage-Withstand Test (Disconnect) .182 89 Magnetic Trip Out Test .183 90 Calibration 200 Percent.183 91 Short Circuit Tests for Tap Conductor Protection 183 91.1 Short
49、 circuit interrupting ability 183 91.2 High fault short circuit test184 RATING 92 Details .184 MARKING 93 Details .184 PART IV COMBINATION MOTOR CONTROLLERS CONSTRUCTION 94 General 185 PERFORMANCE 95 General 188 96 Temperature Test190 97 Dielectric Voltage Withstand Test 191 98 Current Withstand Test .191 99 Contactor Overload Test191 100 Voltage-Withstand Test191 101 Magnetic Trip-Out Test 192 102 Combination Short Circuit Test .192 103 Interrupting Ability (Short C
