UL 20-2010 UL Standard for Safety General-Use Snap Switches (Thirteenth Edition Reprint with Revisions Through and Including February 17 2012)《通用拨动开关》.pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 20 General-Use Snap SwitchesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRO

2、DUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for General-Use Snap Switches, UL 20 Thirteenth Edition, Dated May 10, 2010 Summary of Topics This revision of the Standard for General-Use Snap Switches, ANSI/UL 20, includes the following changes in requirements: Addition of

3、 Requirements to Address Separable Jumper Connector Intended for use with Separable Terminal Assemblies Flammability Testing of Self Contained Switches Switch Markings Flush Switch with Integral Adjustable Mounting Yoke Two- or Three-Circuit Switches Text that has been changed in any manner or impac

4、ted by ULs electronic publishing system is marked with a vertical line in the margin. The revised requirements are substantially in accordance with Proposal(s) on this subject dated September 30, 2011. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system,

5、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 of merchantability or

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8、ss 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. The requirements in this Standard are now in effect

9、, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective 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

10、SUPERSEDED REQUIREMENTS notice. FEBRUARY 17, 2012 UL 20 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 17, 2012 UL 20 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOU

11、T PERMISSION FROM UL Canadian Standards Association CSA-C22.2 No. 11110 Fourth Edition Underwriters Laboratories Inc. UL 20 Thirteenth Edition General-Use Snap Switches May 10, 2010 (Title Page Reprinted: February 17, 2012) ANSI/UL 202012UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTIO

12、N OR DISTRIBUTION WITHOUT PERMISSION FROM UL Commitment for Amendments This standard is issued jointly by the Canadian Standards Association (CSA) and Underwriters Laboratories Inc. (UL). Comments or proposals for revisions on any part of the standard may be submitted to CSA or UL at any time. Revis

13、ions to this standard will be made only after processing according to the standards development procedures of CSA and UL. CSA and UL will issue revisions to this standard by means of a new edition or revised or additional pages bearing their date of issue. ISBN 978-1-55491-403-6 2010 Canadian Standa

14、rds Association All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher. CSA Standards are subject to periodic review, and suggestions for their improvement will be referred to the appropriate committee. To submit a prop

15、osal for change to CSA Standards, please send the following information to inquirescsa.ca and include Proposal for change in the subject line: Standard designation (number); relevant clause, table, and/or gure number; wording of the proposed change; and rationale for the change. To purchase CSA Stan

16、dards and related publications, visit CSAs Online Store at shop.csa.ca or call toll-free 1-800-463-6727 or 416-747-4044. Copyright 2012 Underwriters Laboratories Inc. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All

17、 of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. This ANSI/UL Standard for Safety consists of the Thirteenth Edition including revisions through February 17, 2012. The most recent designation of ANSI/UL 20 as a

18、n American National Standard (ANSI) occurred on February 15, 2012. 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 standar

19、ds. The Department of Defense (DoD) has adopted UL 20 on December 4, 1981. 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 part of the Standard may be submitted to UL at any time. Proposals should be

20、submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. To purchase UL Standards, visit Comm 2000 at http:/m- or call toll-free 1-888-853-3503.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM

21、UL CONTENTS Preface .5 1 Scope .7 2 Denitions 8 3 General 8A 3.1 Components 8A 3.2 Units of Measurement .8B 3.3 Reference Publications .10 4 Construction .12 4.1 Enclosure 12 4.2 Lining 13 4.3 Bushings and Strain Relief .14 4.4 Bases and Bodies .14 4.5 Current-Carrying Parts .16 4.5A Separable Jumpe

22、r Connector for Separable Terminals 20A 4.6 Separable Terminal Assembly 21 4.7 Insulating Material .21 4.8 Actuating Members 22 4.9 Creepage Distances, Clearances, and Distances Through Sealing Compounds .22 4.10 Assembly .24 4.11 Provision for Grounding .25 5 Testing .26 5.1 General 26 5.2 Test Seq

23、uence 26A 5.3 Tungsten-Filament-Lamp Load Characteristics 33 5.4 Assembly Test 35 5.5 Test Conditions .36 5.6 Overload Test .36 5.7 Endurance Test .39 5.8 Temperature Test .40 5.9 Dielectric Voltage-Withstand Test 42 5.10 Security of Switch Leads Test .43 5.11 Push-In Terminal Tests .43 5.12 Effect

24、of Heat on Actuating Members Test 44 5.13 Switching Mechanism Test 44 5.14 Strain-Relief Test .46 5.15 Fault Current Test 46 5.16 Crushing Test 47 5.17 Resistance to Heat Test .47 5.18 Door Switch Assembly Test .47 5.19 Retention of Tab Connection Test 47 5.20 Separable Connector Pull Test .48 5.21

25、Mold Stress Relief Test .48 5.22 Separable Terminal Assembly Humidity Conditioning Followed By Dielectric Test 49 5.23 Short Circuit Withstand Test 49 5.24 Latching Mechanism Test .50 5.25 Abnormal Overload Test 51 5.26 Temperature Test 52 5.27 Continuity Impedance Test 52 5.28 Bonding (Fault Curren

26、t) Test .52 FEBRUARY 17, 2012 CSA-C22.2 NO. 11110 UL 20 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.29 Mounting Yoke Resistance Test 52A 6 Ratings 52A 7 Markings 52B 7.1 General .52B 7.2 Supplementary Markings .54 7.3 Location 56 7.4

27、Tungsten 56A 7.5 AC-Only Identication 57 7.6 Switch Termination Restrictions .57 8 Self-Contained Switches for Use Without a Separate Outlet Box .59 8.1 General 59 8.2 Construction 59 8.3 Performance Testing .62 8.4 Markings and Instructions 69 ANNEX A (Normative) Standards for Components A1 Compone

28、nt Standards 74 Annex B (Informative) Canadian Requirements for CO/ALR Switches B1 General .75 B2 Heat Cycling with Wire Disturbance .77 B3 Heat Cycling with Vibration 78 B4 Environmental 79 B5 Stripping Torque 80 FEBRUARY 17, 2012 CSA-C22.2 NO. 11110 UL 20 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FO

29、R FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface This is the harmonized CSA and UL Standard for General-Use Snap Switches. It is the fourth edition of CSA C22.2 No.111 and the thirteenth edition of UL 20. This edition of CSA C22.2 No. 111 supersedes the previous edition publ

30、ished in 2000. This harmonized Standard was prepared by the Canadian Standards Association (CSA) and Underwriters Laboratories Inc. (UL). The efforts and support of NEMA (National Electrical Manufacturers Association), EFC (Electro-Federation of Canada), and the CANENA Technical Harmonization Commit

31、tee are gratefully acknowledged. This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard. This standard was reviewed by the CSA Integrated Committee on Wiring Devices for Household and General Use, under the jurisdiction of the CSA Technical Com

32、mittee on Wiring Products and the CSA Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the CSA Technical Committee. This standard has been approved by the American National Standards Institute (ANSI) as an American National Standard. Where referen

33、ce is made to a specic number of samples to be tested, the specied number shall be considered a minimum quantity. Note: Although the intended primary application of this standard is stated in its scope, it is important to note that it remains the responsibility of the users of the standard to judge

34、its suitability for their particular purpose. Level of Harmonization This standard is published as an equivalent standard. An equivalent standard is a standard that is substantially the same in technical content, except as follows. Technical national differences are allowed for codes and governmenta

35、l regulations and those recognized as being in accordance with NAFTA Article 905, for example because of fundamental, climatic, geographical, technological, or infrastructural factors, scientic justication, or the level of protection that the country considers appropriate. Presentation is word for w

36、ord except for editorial changes. Interpretations The interpretation by the standards development organization of an identical or equivalent standard is based on the literal text to determine compliance with the standard in accordance with the procedural rules of the standards development organizati

37、on. If more than one interpretation of the literal text has been identied, a revision is to be proposed as soon as possible to each of the standards development organizations to more accurately reect the intent. CSA Effective Date The effective date for CSA International will be announced through CS

38、A Informs or a CSA certication notice. FEBRUARY 17, 2012 CSA-C22.2 NO. 11110 UL 20 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Effective Date As of February 17, 2012, all products Listed, Recognized, or Classied by UL must comply wit

39、h the requirements in this Standard and is not part of the ANSI approved standard. A UL effective date is one established by Underwriters Laboratories Inc. FEBRUARY 17, 2012 CSA-C22.2 NO. 11110 UL 20 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION

40、FROM UL 1 Scope 1.1 The requirements of this Standard apply to manually operated, general-use snap switches for connection to copper (Cu) or copper-clad conductors used in accordance with the National Electrical Code(NEC), ANSI/NFPA 70, or the Canadian Electrical Code (CEC), Part I, and intended for

41、 connection to wiring systems recognized by the NEC or the CEC, Part I. In Canada, requirements for switches for connection to aluminum (Al) conductors used in accordance with the CEC, Part I, and intended for connection to wiring systems recognized by the CEC, Part I, are covered in Annex B. 1.2 Th

42、is Standard applies to ac/dc rated switches for which the load ratings do not exceed 60 A at 250 V or less, 30 A at 251 V 600 V, and 2 hp at 125 V 600 V or less. This Standard also covers ac-only rated switches for which the load ratings do not exceed 30 A at 347 Vac or less. 1.3 This Standard appli

43、es to switches constructed to be installed readily in a ush device box or on an outlet-box cover and intended for connection to branch-circuit wiring. 1.4 This Standard applies to pendant and through-cord switches intended for eld installation on exible cord and provided with one “on” and one “off”

44、position. 1.5 This Standard applies to switches intended for surface mounting and provided with a separable base and cover for connection to exposed wiring consisting of nonmetallic sheathed cable or open wiring on insulators (knob and tube). 1.6 This Standard applies to self-contained switches inte

45、nded for ush mounting without a separate outlet box and for connection to branch-circuit wiring consisting of one or more non-metallic sheathed cables containing copper conductors. 1.7 This Standard applies to ac/dc xture switches intended to be installed in xtures to control incandescent lighting o

46、r fans for connection to branch-circuit wiring. 1.8 This Standard also applies to single-pole, momentary-contact door switches constructed to be installed readily in a special-purpose device box or on an outlet-box cover for connection to branch-circuit wiring. 1.9 This Standard does not apply to: a

47、) Clock operated switches specied in the Standard for Clock-Operated Switches, UL 917, and CSA Standard C22.2 No. 177; b) Dimmer switches specied in the Standard for Solid-State Dimming Controls, UL 1472, and CSA Standard C22.2 No. 184.1; c) Industrial control equipment specied in the Standard for I

48、ndustrial Control Equipment, UL 508, and CSA Standard C22.2 No. 14; d) Solid-state, single-phase motor speed controls specied in the Standard for Solid-State Fan Speed Controls, UL 1917, and CSA Standard C22.2 No. 156; e) Special-use and ac-only xture switches specied in the Standard for Special-Use

49、 Switches, UL 1054, and CSA Standard C22.2 No. 55; and f) Switches for use in hazardous locations specied in the Standard for Switches for Use in Hazardous (Classied) Locations, UL 894, and CSA Standard C22.2 No. 159. MAY 10, 2010 CSA-C22.2 NO. 11110 UL 20 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 1.10 For switches intended for connection to branch-circuit wiring containing alumin