1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 508 Industrial Control EquipmentUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER R
2、EPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Industrial Control Equipment, UL 508 Seventeenth Edition, Dated January 28, 1999 Summary of Topics These revisions to UL 508 are being issued to remove the reference to the withdrawal date of UL 873 and to address univ
3、ersal upkeep of UL Standards for Safety. These revisions are considered to be non-substantive and not subject to ULs STP process. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked
4、with a vertical line in the margin and are followed by an effective date note indicating the date of publication or the date on which the changed requirement becomes effective. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any for
5、m 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 of merchantability or tness for any purpose. In
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8、oss, 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. The requirements in this Standard are now in effect, except for those paragr
9、aphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. 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
10、SUPERSEDED REQUIREMENTS notice. OCTOBER 16, 2013 UL 508 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 16, 2013 UL 508 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOU
11、T PERMISSION FROM UL JANUARY 28, 1999 (Title Page Reprinted: October 16, 2013) 1 UL 508 Standard for Industrial 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
12、 Edition July, 1938 Eighth Edition May, 1956 Ninth Edition December, 1962 Tenth Edition September, 1964 Eleventh Edition August, 1971 Twelfth Edition May, 1977 Thirteenth Edition December, 1983 Fourteenth Edition August, 1984 Fifteenth Edition September, 1989 Sixteenth Edition February, 1993 Sevente
13、enth Edition January 28, 1999 This ANSI/UL Standard for Safety consists of the Seventeenth edition, including revisions through October 16, 2013. The most recent designation of ANSI/UL 508 as an American National Standard (ANSI) occurred on March 15, 2013. ANSI approval for a standard does not inclu
14、de the Cover Page, Transmittal Pages, Title Page, or effective date information. The Department of Defense (DoD) has adopted UL 508 on June 5, 1989. The publication of revised pages or a new edition of this Standard will not invalidate the DoD adoption. Comments or proposals for revisions on any par
15、t 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:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered
16、 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. COPYRIGHT 2013 UNDERWRITERS LABORATORIES INC. ANSI/UL 508-2013UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WIT
17、HOUT PERMISSION FROM UL MARCH 15, 2013 INDUSTRIAL CONTROL EQUIPMENT - UL 508 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope 17 2 Glossary .18A 3 Units of Measurement 20 4 Components 20 4A
18、Undated References Section 4A added March 15, 2013 . 2 0 5 Installation and Operation Instructions 21 PART I ALL EQUIPMENT ENCLOSURE CONSTRUCTION 6 Frames and Enclosure .21 6.1 General 21 6.2 Cast metal 21 6.3 Sheet metal 22 6.4 Doors and covers 24B 6.5 Polymeric .26 6.6 Bonding 27 6.7 Resistance me
19、asurement .30 6.8 Openings in enclosure .31 6.9 Ventilating openings .31 6.10 Barriers used with ventilation openings 32 6.11 Forced ventilation 34 6.12 Observation windows .34 6.13 Transformer or autotransformer 34 6.14 Motor controller wire bending space 34 6.15 Specic enclosures .34A 6.16 Compone
20、nts for use on specic enclosures 34D 6.17 Accessibility of live parts 35 7 Protection Against Corrosion 37 7.1 General 37 7.2 Outdoor enclosures 40 ENCLOSURE PERFORMANCE 8 General .40 9 Securement of Snap-On Cover Test .41 INSTRUCTIONS AND MARKINGS PERTAINING TO ENCLOSURES 10 Permanence of Marking .
21、42 11 Details .42 MARCH 15, 2013 INDUSTRIAL CONTROL EQUIPMENT - UL 508 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DEVICE CONSTRUCTION 12 General 42B 13 Protection Against Corrosion 42B 14 Provisions for Mounting 42B 15 Insulating Mater
22、ial .42B 16 Means for Switching 44 17 Live Parts 44 18 Protective Devices 45 18.1 General .45 18.2 Protection of internal primary and secondary control circuit conductors .45 18.3 Protection of control circuit transformer 48A 18.4 Low-voltage protection .48B 18.5 Phase loss protection Section 18.5 R
23、evised March 15, 2013 4 9 18.6 Phase-reversal protection .49 19 Capacitors .49 20 Fuseholders 49 21 Internal Wiring 50 21.1 General .50 21.2 Routing of internal wiring 51 21.3 Clamps and guides .51 21.4 Flexing of internal wiring 51 21.5 Additional insulation 51 21.6 Splices and connections 51 21.7
24、Splice insulation 52 22 External Interconnections 52 22.1 Open equipment .52 22.2 Enclosed equipment 52 22.3 Interconnecting cords and cables 52 23 Transformers .53 24 Blower Motors 53 25 Supply Connections .53 25.1 General .53 25.2 Permanently connected equipment .53 25.3 Tapped holes for conduit 5
25、4 25.4 Knockouts .54 25.5 Size of wiring terminals and leads 54 25.5A Evaluation of pressure wire connectors 56 25.5B Evaluation of quick connect terminals .57 25.5C Evaluation of wire binding screws .58 25.5D Evaluation of eld wiring leads .58 25.5E Evaluation of spring type terminations 58A 25.6 C
26、ord-connected equipment .58A 26 Cord-Connected Programming and Diagnostic Units .58D 27 Coil Windings .58D 28 Risk of Electric Shock 58D 29 Risk of Fire .58E 30 Lithium Battery Circuits 59 31 Non-Lithium Battery Circuits 59 31.1 General .59 31.2 Primary non-rechargeable .60 MARCH 15, 2013 INDUSTRIAL
27、 CONTROL EQUIPMENT - UL 508 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 31.3 Secondary rechargeable/non-rechargeable 60 32 Isolated Secondary Circuits 60 32.1 General .60 32.2 Differences between the level of evaluation required within
28、each type of secondary circuit .63 32.3 Class 2 circuit requirements .63 32.4 Limited voltage/current circuit requirements 63 32.5 Limited voltage circuit requirements 64 32.6 Isolated power supply circuit requirements .64A 32.7 Limited energy circuit requirements .65 32.8 Limiting impedance circuit
29、 requirements .65 33 Limited Voltage Primary Circuit .67 33.1 General .67 33.2 Overcurrent protection primary circuits .67 33.3 Overcurrent protection secondary circuits 67 34 Separation of Circuits .68 35 Isolation Devices 68A 36 Spacings .68A 37 Insulating Barriers 74 38 Clamped Insulating Joints
30、in Lieu of Spacings 75 39 Clearance and Creepage Distances .77 39A Protection of Service Personnel .78 40 Grounding .79 40.1 General .79 40.2 Internal insulated bonding, grounding, and grounded circuit conductors .81 40.3 Transformer secondary grounding 81 41 Accessories 82 DEVICE PERFORMANCE 42 Gen
31、eral 83 43 Temperature Test .84A 44 Overvoltage and Undervoltage Test .87 45 Overload Test 88 46 Endurance Test .94A 47 Endurance Test for Relays for Television Applications .96B 48 Calibration Test .96B 49 Dielectric Voltage-Withstand Test .99 49.1 General .99 49.2 Coils .100 49.3 Secondary circuit
32、s .100A 50 Short Circuit Test General .100A 50.1 General .100A 50.2 Enclosure 101 50.3 Sample preparation .103 50.4 Group fusing .104 51 Standard Fault Current Circuits 104 51.1 Protective devices .104 51.2 Sample selection for overload relay .106 51.3 Parameters .106A 52 High-Available Fault Curren
33、t Circuits (Optional) .108 52.1 General 108 52.2 Sample selection 108 MARCH 15, 2013 INDUSTRIAL CONTROL EQUIPMENT - UL 508 4AUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 52.3 Procedure 110 52A Group Installation (Optional) 110A 52A.1 Gene
34、ral .110A 52A.2 Sample selection .110B 52A.3 Group installation for standard fault circuit ratings 110C 52A.4 Group installation for high capacity short circuit ratings 110C 53 Standard and High Fault Acceptance Criteria 110C 54 Calibration of Test Circuits 110D 54.1 Circuit characteristics .110D 54
35、.2 Alternating-current circuits 112 54.3 Direct current circuits 116 54.4 Instrumentation for test currents above 10,000 amperes .117 54.5 Calibration characteristics for protective device .118 55 Transient-Voltage-Surge Suppression Test .121 56 Accelerated Aging Test .122A 57 Breakdown of Component
36、s Test .122A 57A Strain Relief Test .122B 57B Push-Back Relief Test .122B 58 Wire Flexing .122B 59 Terminal Torque Test .122C 60 Printed Wiring Board Abnormal Operation Test 122C 61 Secondary Circuits Test 123 61.1 General 123 61.2 Limited voltage/current secondary test .125 61.3 Limited energy seco
37、ndary test 126 61.4 Isolated power supply capacity test 126 61.5 Limited voltage secondary test .126 61.6 Limiting impedance test .126A 61A Leakage Current Test .127 61B Protection Against Contact with Live Parts of Door Mounted Components Test .128B 61C Electronic Fluorescent Ballasts .128B DEVICE
38、RATING 62 Details 128F MARKING 63 General .128H 64 Wiring Terminal Markings .130A 65 Cautionary Markings .131 INSTRUCTIONS AND MARKINGS PERTAINING TO ACCESSORIES 66 Details .134 67 Marking Location 134 MANUFACTURING AND PRODUCTION TESTS 67A Production-Line Dielectric Voltage-Withstand Test 137 67B P
39、roduction-Line Grounding-Continuity Test 139 67C Production-Line Polarization-Continuity Test Cord and Plug Connected Equipment .139 MARCH 15, 2013 INDUSTRIAL CONTROL EQUIPMENT - UL 508 4BUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PART
40、II MAGNETIC MOTOR CONTROLLERS CONSTRUCTION 68 General 139 MARCH 15, 2013 INDUSTRIAL CONTROL EQUIPMENT - UL 508 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 15, 2013 INDUSTRIAL CONTROL EQUIPMENT - UL 508 6 No Text on This PageUL COP
41、YRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PERFORMANCE 69 General 140 RATING 70 Details .140 MARKING 71 Marking 140 PART III MANUAL MOTOR CONTROLLERS CONSTRUCTION 72 General 140 PERFORMANCE 73 General 141 73A Temperature Test 143 73B Enduranc
42、e Test (Motor Disconnect) 143 73C Dielectric Voltage Withstand Test 144 73D Short Circuit Test (Motor Disconnect) .144 73E Voltage-Withstand Test (Disconnect) 144A 73F Magnetic Trip Out Test 144A 73G Calibration 200 Percent 144B 73H Short Circuit Tests for Tap Conductor Protection .144B 73H.1 Short
43、circuit interrupting ability .144B 73H.2 High fault short circuit test .144B RATING 74 Details 144B MARKING 75 Details 144C PART IV COMBINATION MOTOR CONTROLLERS CONSTRUCTION 76 General .144D JULY 11, 2005 INDUSTRIAL CONTROL EQUIPMENT - UL 508 6AUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REP
44、RODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PERFORMANCE 77 General 145 77A Temperature Test .148A 77B Dielectric Voltage Withstand Test .148B 78 Current Withstand Test .148B 79 Contactor Overload Test 148B 80 Voltage-Withstand Test .150 81 Magnetic Trip-Out Test .150 82 Combination Short Ci
45、rcuit Test 151 82A Interrupting Ability (Short Circuit) Test 152 83 Endurance Test .156 84 Calibration Test 200 Percent 156 85 High Available Short Circuit Current Test .156 86 Coordination Test 156A RATINGS 87 Details 156A MARKING 88 Details 156B PART V REDUCED-VOLTAGE STARTERS CONSTRUCTION 89 Gene
46、ral .156E PERFORMANCE 90 Operation Test .156E 91 Duty Cycle Test 156F RATINGS 92 Details .157 MARKING 93 Details .158 PART VI SOLID-STATE AC MOTOR CONTROLLERS CONSTRUCTION 94 General 158 DECEMBER 12, 2002 INDUSTRIAL CONTROL EQUIPMENT - UL 508 6BUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPR
47、ODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PERFORMANCE 95 General 158 96 Temperature Test 160 97 Dielectric Voltage-Withstand Test 160 98 Overvoltage and Undervoltage Test 160 99 Overload Test .160 100 Endurance Test 160 101 Short Circuit Test .161 101.1 Evaluation of short circuit test .16
48、1 101.2 Selection of samples .161 101.3 Test procedure 161 101.4 Test circuit 162 102 Breakdown of Components Test 162 103 Operation Tests 162 103.1 General .162 103.2 Controller overload 162A 103.3 Single phasing .163 103.4 Inoperative blower motor 163 103.5 Clogged lter 163 103.6 Current limiting
49、control 163 RATING 104 Details 163 MARKING 105 Details 164 PART VII FLOAT- AND PRESSURE-OPERATED SWITCHES GENERAL 105A Glossary .164 CONSTRUCTION 106 General .164 107 Supply Connections Permanently-Connected Devices .164A 108 Supply Connections Cord- and Plug-Connected Devices .164B PERFORMANCE 109 General 164B 110 Overload Test 165 111 Endurance Test 165 112 Pressure Tests .166 112.1 General .166 112.2 Parts contained in an enclosure 166A 112.3 Parts not contained
