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1、UL 508,ISBN 0-7629-0404-6,Industrial Control Equipment,JULY 16,1999 UL 508,tr1,Underwriters Laboratories Inc.(UL)333 Pngsten RoadNorthbrook,IL 60062-2096UL Standard for Safety for Industrial Control Equipment,UL 508Seventeenth Edition,Dated January 28,1999Revisions:This Standard contains revisions t
2、hrough and including July 16,1999.UL is in the process of converting its Standards for Safety to the Standard Generalized Markup Language(SGML),and implementing an SGML compliant document management and publishing system.SGML-an international standard(ISO 8879-1986)-is a descriptive markup language
3、that describes a documentsstructure and purpose,rather than its physical appearance on a page.Signicant benets that will resultfrom ULs use of SGML and these new systems include increased productivity,reduced turnaround times,and data and information consistency,reusability,shareability,and portabil
4、ity.However,the fonts,pagination,and general formatting of ULs new electronic publishing system differ from that of ULsprevious publishing system.Consequently,when revision pages are issued for a Standard with the newpublishing system,these differences may result in the printing of pages on which no
5、 requirements havebeen changed-these additional pages result from relocation of text due to repagination and reformattingof the Standard with the new publishing system.Text that has been changed in any manner is marked with a vertical line in the margin.Changes inrequirements are marked with a verti
6、cal line in the margin and are followed by an effective date noteindicating the date of publication or the date on which the changed requirement becomes effective.The new and/or revised requirements are substantially in accordance with ULs Bulletin(s)on this subjectdated June 16,1998.The bulletin(s)
7、is now obsolete and may be discarded.The new and revised requirements were originally published as revisions to the sixteenth edition of thisUL Standard.These requirements are now reissued for,and renumbered in accordance with,theseventeenth edition of this UL Standard.The revisions dated July 16,19
8、99 include an editorial change in title for UL 489,Standard forMolded-Case Circuit Breakers,Molded-Case Switches,and Circuit Breaker Enclosures.As indicated on the title page(page1),this UL Standard for Safety has been adopted by the Departmentof Defense.The master for this Standard at ULs Northbroo
9、k Office is the official 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
10、 of a Standard,nor the distributiondiskette for a Standard-on-Diskette and the le 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 ri
11、ghts reserved.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.,tr2,JULY 16,1999 UL 508,Revisions of UL Standards for Safety are issued from time t
12、o time.A UL Standard for Safety 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 tness for any purpose.In no event wi
13、ll 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 theinability to use this Standard,even if UL or an authorized UL representative has been advised of thepossibility
14、of such damage.In 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 WordPerfect,Envoy,and Standards-on-Diskette.However,this support service is offered on a reasonable effo
15、rts basis only,and UL may not be able toresolve every support request.UL supports a Standards-on-Diskette only if it is used under the conditionsand operating systems for which it is intended.ULs support policies may change from time-to-time withoutnotication.UL reserves the right to change the form
16、at,presentation,le types and formats,delivery methods andformats,and the like of both its printed and electronic Standards without prior notice.Standards-on-Diskette purchasers agree to defend,indemnify,and hold UL harmless from and againstany loss,expense,liability,damage,claim,or judgement(includi
17、ng reasonable attorneys fees)resultingfrom any error or deviation introduced while purchaser is storing a Standard-on-Diskette on thepurchasers computer system.If a single-user version Standards-on-Diskette was purchased,one copy of this Standard may be storedon the hard disk of a single personal co
18、mputer,or on a single LAN le-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 multiple concurrent access.The original distributiondiskette should be stored in a saf
19、e place.If a multiple-user version Standards-on-Diskette was purchased,one copy of the Standard may be storedon a single LAN le-server,or on the permanent storage device of a multiple-user computer.The numberof concurrent users shall not exceed the number of users authorized for the Standards-on-Dis
20、ketteversion.The original distribution diskette should be stored in a safe place.Standards-on-Diskette 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 a
21、Standards-on-Diskette.Only one copy of the Standard may be printed for eachauthorized user of a multiple-user version of a Standards-on-Diskette.An employee of an organizationpurchasing a Standard-on-Diskette can make a copy of the page or pages being viewed for their own fairand/or practical intern
22、al use.Because of differences in the computer/software/printer setup used by ULand those of Standards-on-Diskette purchasers,the printed copy obtained by a purchaser may not lookexactly like the on-line screen view or the printed Standard.The requirements in this Standard are now in effect,except fo
23、r those paragraphs,sections,tables,gures,and/or other elements 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
24、 by a SUPERSEDED REQUIREMENTS notice.,JULY 16,1999 UL 508,tr3,New product submittals made prior to a specied future effective date will be judged under all of therequirements in this Standard including those requirements with a specied future effective date,unlessthe applicant specically requests th
25、at the product be judged under the current requirements.However,ifthe applicant 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 understa
26、nding of this should be signied in writing.Copyright 1999 Underwriters Laboratories Inc.,tr4This Standard consists of pages dated as shown in the following checklist:Page,JULY 16,1999 UL 508Date,1-2.January3-15.July16-17.January18-20B.July21-27.January28-28B.July29.January30-32.July33.January34-36B.
27、July37-39.January40.July41.January42-42B.July43.January44.July45-46.January47.July48-50.January51-52.July53-54.January55-58B.July59-76.January77.July78-81.January82-85.July86.January86A-87.July88.January89.July90-94.January95.July96-100.January101-106B.July107.January108-111.July112-122.January122A-
28、123.July124.January125.July126-127.January128-128B.July129-132.January133.July134.January134A-135.July136.January136A-137.July138.January,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,199919991999199
29、9199919991999199919991999199919991999199919991999199919991999199919991999199919991999199919991999199919991999199919991999199919991999199919991999199919991999199919991999199919991999,JULY 16,1999 UL 508,tr5,139.July140.January141-145.July146-149.January150.July151-154.January155.July156-160.January16
30、1-162B.July163-176.January177.July178-181.January182-183.July184-185.January186-186B.July187-197.January198.July199-208.JanuarySA1-SA4.JanuaryA1.JulyA2.JanuaryB1-B18.JulySR1-SR8.July,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,16,28,28,16,28,16,16,199919991999199919991999199919991999199919991999
31、19991999199919991999199919991999199919991999,tr6,No Text on This Page,JULY 16,1999 UL 508,JANUARY 28,1999,1,UL 508,Standard for Industrial Control Equipment,First Edition September,1925Second Edition March,1928,Third Edition June,1931,Fourth Edition February,1933,Fifth Edition August,1933Sixth Editi
32、on May,1934,Seventh Edition July,1938Eighth Edition May,1956,Ninth Edition December,1962Tenth Edition September,1964Eleventh Edition August,1971,Twelfth Edition May,1977,Thirteenth Edition December,1983Fourteenth Edition August,1984Fifteenth Edition September,1989Sixteenth Edition February,1993,Seve
33、nteenth Edition,January 28,1999,An effective date included as a note immediately following certain requirementsis one established by Underwriters Laboratories Inc.,The Department of Defense(DoD)has adopted UL 508 on June 5,1989.Thepublication of revised pages or a new edition of this Standard will n
34、ot invalidatethe DoD adoption.,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 revisions,all of which are itemized on the transmittal noticethat accompanies the latest
35、set of revised requirements.,ISBN 0-7629-0404-6,COPYRIGHT 1977,1999 UNDERWRITERS LABORATORIES INC.,2,INDUSTRIAL CONTROL EQUIPMENT-UL 508No Text on This Page,JANUARY 28,1999,3,1,2,3,4,5,JULY 16,1999,INDUSTRIAL CONTROL EQUIPMENT-UL 508,CONTENTSFOREWORD.16INTRODUCTIONScope.17Glossary.18Units of Measure
36、ment.20AComponents.20AInstallation and Operation Instructions.21PART I ALL EQUIPMENTENCLOSURE CONSTRUCTION6 Frames and Enclosure.216.1 General.216.2 Cast metal.216.3 Sheet metal.216.4 Doors and covers.246.5 Polymeric.286.6 Bonding.28A6.7 Resistance measurement.306.8 Openings in enclosure.306.9 Venti
37、lating openings.316.10 Barriers used with ventilation openings.326.11 Forced ventilation.336.12 Observation windows.336.13 Transformer or autotransformer.336.14 Motor controller wire bending space.336.15 Specic enclosures.346.16 Components for use on specic enclosures.366.17 Accessibility of live pa
38、rts.36A7 Protection Against Corrosion.377.1 General.377.2 Outdoor enclosures.39ENCLOSURE PERFORMANCE8 General.409 Securement of Snap-On Cover Test.41INSTRUCTIONS AND MARKINGS PERTAINING TO ENCLOSURES10 Permanence of Marking.4111 Details.41,4,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,3
39、1,32,INDUSTRIAL CONTROL EQUIPMENT-UL 508,JULY 16,1999,DEVICE CONSTRUCTIONGeneral.43Protection Against Corrosion.43Provisions for Mounting.43Insulating Material.43Means for Switching.45Live Parts.45Protective Devices.4618.1 General.4618.2 Protection of internal primary and secondary control circuit c
40、onductors.4618.3 Protection of control circuit transformer.4818.4 Low-voltage protection.4918.5 Open-phase protection.4918.6 Phase-reversal protection.49Capacitors.50Fuseholders.50Internal Wiring.5021.1 General.5021.2 Routing of internal wiring.5121.3 Clamps and guides.5121.4 Flexing of internal wir
41、ing.5121.5 Additional insulation.5121.6 Splices and connections.5121.7 Splice insulation.52External Interconnections.5222.1 Open equipment.5222.2 Enclosed equipment.5222.3 Interconnecting cords and cables.52Transformers.53Blower Motors.53Supply Connections.5325.1 General.5325.2 Permanently connected
42、 equipment.5325.3 Tapped holes for conduit.5425.4 Knockouts.5425.5 Wiring terminals and leads.5425.6 Cord-connected equipment.57Cord-Connected Programming and Diagnostic Units.58Coil Windings.58Risk of Electric Shock.58Risk of Fire.58ALithium Battery Circuits.59Non-Lithium Battery Circuits.5931.1 Ge
43、neral.5931.2 Primary non-rechargeable.5931.3 Secondary rechargeable/non-rechargeable.59Secondary Circuits.6032.1 General.6032.2 Differences between the level of evaluation required within each type of secondarycircuit.6032.3 Class 2 circuit requirements.6232.4 Limited voltage/current circuit require
44、ments.62,5,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,JULY 16,1999,INDUSTRIAL CONTROL EQUIPMENT-UL 508,32.5 Limited voltage circuit requirements.6432.6 Isolated power supply circuit requirements.6432.7 Limiting energy circuit requirements.6532.8 Limiting impedance circuit requirements.65Limi
45、ted Voltage Circuit Overcurrent Protection.6633.1 General.6633.2 Overcurrent protection primary circuits.6633.3 Overcurrent protection secondary circuits.67Separation of Circuits.67Isolation Devices.68Spacings.68Insulating Barriers.74Clamped Insulating Joints in Lieu of Spacings.76Clearance and Cree
46、page Distances.76Grounding.7840.1 General.7840.2 Internal insulated bonding,grounding,and grounded circuit conductors.7940.3 Transformer secondary grounding.79Accessories.80DEVICE PERFORMANCEGeneral.80Temperature Test.82Overvoltage and Undervoltage Test.89Overload Test.89Endurance Test.94Endurance T
47、est for Relays for Television Applications.97Calibration Test.98Dielectric Voltage-Withstand Test.9949.1 General.9949.2 Coils.10049.3 Secondary circuits.10050 Short Circuit Test General.10150.1 General.10150.2 Enclosure.10250.3 Sample preparation.10350.4 Group fusing.10351 Standard Fault Current Cir
48、cuits.10451.1 Protective devices.10451.2 Sample selection for overload relay.10651.3 Parameters.10652 High-Available Fault Current Circuits(Optional).10852.1 General.10852.2 Sample selection.10852.3 Procedure.11052A Group Installation(Optional).110A52A.1 General.110A52A.2 Sample selection.110B52A.3
49、Group installation for standard fault circuit ratings.110B52A.4 Group installation for high capacity short circuit ratings.110B53 Standard and High Fault Acceptance Criteria.110C54 Calibration of Test Circuits.110D,6,INDUSTRIAL CONTROL EQUIPMENT-UL 508,JULY 16,1999,54.1 Circuit characteristics.110D5
50、4.2 Alternating-current circuits.11254.3 Direct current circuits.11654.4 Instrumentation for test currents above 10,000 amperes.11754.5 Calibration characteristics for protective device.11855 Transient-Voltage-Surge Suppression Test.12156 Accelerated Aging Test.12157 Breakdown of Components Test.121
