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1、DocumentWasDownloadedBySAN YIM ForUseByROCOM ELECTRIC(CHINA) MFY37922:1/5/2009-6:40PMUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL 20General-Use Snap SwitchesDocument Was Downloaded By SAN YIM For Use By ROCOM ELECTRIC (CHINA) MFY 37922
2、: 1/5/2009 - 6:40 PMThis PDF Standard downloaded from UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULDECEMBER 12, 2008 UL 20tr3Document Was Downloaded By SAN YIM For Use By ROCOM ELECTRIC (CHINA) MFY 37922 : 1/5/2009 - 6:40 PMUnderwriters La
3、boratories Inc. (UL)333 Pfingsten RoadNorthbrook, IL 60062-2096UL Standard for Safety for General-Use Snap Switches, UL 20Twelfth Edition, Dated September 22, 2000Revisions: This Standard contains revisions through and including December 12, 2008.Summary of TopicsThis revision of ANSI/UL 20 includes
4、 the following changes in requirements: Clarification of 347 V Endurance TestContact Sticking - AC SwitchesGrounding Symbol With or Without the CircleText that has been changed in any manner is marked with a vertical line in the margin.The revised requirements are substantially in accordance with UL
5、s Proposal(s) on this subject dated June27, 2008.The revisions dated December 12, 2008 include a reprinted title page (page1) for this Standard.As indicated on the title page (page 1), this UL Standard for Safety is an American National Standard. Attention is directed to the note on the title page o
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23、QUIREMENTS notice.New product submittals made prior to a specified future effective date will be judged under all of the requirements in this Standard including those requirements with a specified future effective date, unless the applicant specifically requests that the product be judged under the
24、current requirements. However, ifDocument Was Downloaded By SAN YIM For Use By ROCOM ELECTRIC (CHINA) MFY 37922 : 1/5/2009 - 6:40 PMthe applicant elects this option, it should be noted that compliance with all the requirements in this Standard will be required as a condition of continued Listed, Rec
25、ognized, Classified, and Follow-Up Services after the effective date, and understanding of this should be signified in writing.Copyright 2008 Underwriters Laboratories Inc.This Standard consists of pages dated as shown in the following checklist:PageDate1-3 . December 12, 20084 . June 1, 20045-8 . D
26、ecember 12, 20089-11 . September 22, 200012-14 . June 1, 200415-18. September 22, 200019 . June 13, 200220-21. September 22, 200022 . December 17, 200423-25. September 22, 200026 . June 13, 200227 . June 1, 200428 . December 12, 200829-30 . June 1, 200431-33. September 22, 200034 . June 13, 200235-3
27、9. September 22, 200040-42 . December 12, 200843-48. September 22, 200049-50A . June 1, 200450B. June 13, 200251-52. September 22, 200053 . June 1, 200454-55. September 22, 200056-56B . June 1, 200457-67. September 22, 200068 . June 1, 200469-70. September 22, 2000A1-A2 . September 22, 2000B1 . June
28、 13, 2002B2-B6 . September 22, 2000This PDF Standard downloaded from Document Was Downloaded By SAN YIM For Use By ROCOM ELECTRIC (CHINA) MFY 37922 : 1/5/2009 - 6:40 PMNo Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULCanadi
29、an Standards AssociationCSA-C22.2 No. 111Third EditionUnderwriters Laboratories Inc. UL 20Twelfth EditionDocument Was Downloaded By SAN YIM For Use By ROCOM ELECTRIC (CHINA) MFY 37922 : 1/5/2009 - 6:40 PMGeneral-Use Snap SwitchesSeptember 22, 2000(Title Page Reprinted: December 12, 2008)ANSI/UL 20-2
30、008Commitment for AmendmentsDocument Was Downloaded By SAN YIM For Use By ROCOM ELECTRIC (CHINA) MFY 37922 : 1/5/2009 - 6:40 PMThis Standard is issued jointly by Canadian Standards Association and Underwriters Laboratories Incorporated. Amendments to this Standard will be made only after processing
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33、usive property of UL.To purchase UL Standards, visit Comm 2000 at m-help/how_to_order.aspx or call toll-free 1-888-853-3503.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULThis PDF Standard downloaded from ISBN 1-55324-251-3Copyright 2000Cana
34、dian Standards AssociationAll rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher.Copyright 2008Underwriters Laboratories Inc.DECEMBER 12, 2008CSA-C22.2 NO. 111 UL 205Document Was Downloaded By SAN YIM For Use By ROCOM E
35、LECTRIC (CHINA) MFY 37922 : 1/5/2009 - 6:40 PMCONTENTSPreface . .51 Scope . .92 Definitions . .103 General . .113.1 New Product Evaluation . .113.2 Components . .113.3 Units of Measurement . .123.4 Reference Publications . .124 Construction . .144.1 Enclosure . .144.2 Lining . .164.3 Bushings and Strain Relief . .164.4 Bases and Bodies . .174.5 Current-Carrying Parts . .184.6 Insulating Material . .234.7 Actuating Members . .244.8 Creepage Distances, Clearances, and Distances Through Sealing Compounds . .244.9 Assembly .
