UL 20-2018 UL Standard for Safety General-Use Snap Switches (Fourteenth Edition).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 Switches STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZ

2、ED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for General-Use Snap Switches, UL 20 Fourteenth Edition, Dated July 20, 2018 Summary of Topics This new edition of the ANSI/UL 20, includes the following specic changes in requirements: Marking Requirements

3、 for Leaded Devices including those with Separable Terminal Assemblies Flush Switches Employing a Combination Wire Binding/Pressure -Type Terminal Construction AC Only Flush Switch with Integral Power Supply with Class 2 Output Connectors Accommodate Electronic Ballasts up to 347V Additional Editori

4、al and Technical Revisions to Improve Clarity The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated February 2, 2018. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any

5、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 no event

6、 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 an authorized UL representative has been advised of the

7、 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, indemnify, and hold UL harmless from and against any loss, expe

8、nse, 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. JULY 20, 2018 UL 20 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTIO

9、N OR DISTRIBUTION WITHOUT PERMISSION FROM UL JULY 20, 2018 UL 20 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Association of Standardization and Certication NMX-J-005-ANCE First Edition Canadian Standards Associati

10、on CAN/CSA-C22.2 No. 111-18 Fifth Edition Underwriters Laboratories Inc. UL 20 Fourteenth Edition General-Use Snap Switches July 20, 2018 ANSI/UL 20-2018UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Commitment for Amendments This standard

11、is issued jointly by the Association of Standardization and Certication (ANCE), the Canadian Standards Association (operating as “CSA Group”), and Underwriters Laboratories Inc. (UL). Comments or proposals for revisions on any part of the standard may be submitted to ANCE, CSA Group, or UL at anytim

12、e. Revisions to this standard will be made only after processing according to the standards development procedures of ANCE, CSA Group, and UL. CSA Group and UL will issue revisions to this standard by means of a new edition or revised or additional pages bearing their date of issue. ANCE will incorp

13、orate the same revisions into a new edition of the standard bearing the same date of issue as the CSA Group and UL pages. Copyright 2018 Rights reserved in favor of ANCE. ISBN 978-1-4883-1315-8 2018 Canadian Standards Association All rights reserved. No part of this publication may be reproduced in

14、any form whatsoever without the prior permission of the publisher. This Standard is subject to review within ve years from the date of publication, and suggestions for its improvement will be referred to the appropriate committee. To submit a proposal for change, please send the following informatio

15、n to inquirescsagroup.org 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 Group Standards and related publications, visit CSA Groups Online St

16、ore at shop.csa.ca or call toll-free 1-800-463-6727 or 416-747-4044. Copyright 2018 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 of ULs Standards and all copyrights, ownerships, an

17、d rights regarding those Standards shall remain the sole and exclusive property of UL. This ANSI/UL Standard for Safety consists of the Fourteenth Edition. The most recent designation of ANSI/UL 20 as an American National Standard (ANSI) occurred on July 20, 2018. ANSI approval for a standard does n

18、ot include the Cover Page, Transmittal Pages, Title Page (front and back), or the Preface. TheDepartmentofDefense(DoD)hasadoptedUL20onDecember4,1981.Thepublicationofrevised pages or a new edition of this Standard will not invalidate the DoD adoption. Comments or proposals for revisions on any part o

19、f 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 https:/. To purchase UL Standards, visit ULs Standards Sales Site at http:/ HowToOrder.aspx or call toll-free 1-888-853-3503.UL

20、COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS Preface .6 1 Scope .7 2 Denitions8 3 General 9 3.1 Components .9 3.2 Units of Measurement10 3.3 Reference Publications.10 4 Construction.13 4.1 Enclosure 13 4.2 Lining 15 4.3 Bushings and

21、 Strain Relief .15 4.4 Bases and Bodies .16 4.5 Current-Carrying Parts .18 4.6 Separable Jumper Connector for Separable Terminals .23 4.7 Separable Terminal Assembly 23 4.8 Insulating Material .23 4.9 Actuating Members 24 4.10 Creepage Distances, Clearances, and Distances Through Sealing Compounds 2

22、4 4.11 Assembly .26 4.12 Provision for Grounding .27 5 Testing .28 5.1 General 28 5.2 Test Sequence 29 5.3 Tungsten-Filament-Lamp Load Characteristics 35 5.4 Assembly Test 37 5.5 Test Conditions .38 5.6 Overload Test.38 5.7 Endurance Test .41 5.8 Temperature Test .42 5.9 Dielectric Voltage-Withstand

23、 Test44 5.10 Security of Switch Leads Test .45 5.11 Push-In Terminal Tests .45 5.12 Effect of Heat on Actuating Members Test 46 5.13 Switching Mechanism Test 46 5.14 Strain-Relief Test.48 5.15 Fault Current Test 48 5.16 Crushing Test49 5.17 Resistance to Heat Test.49 5.18 Door Switch Assembly Test .

24、49 5.19 Retention of Tab Connection Test 49 5.20 Separable Connector Pull Test.50 5.21 Mold Stress Relief Test .50 5.22 Separable Terminal Assembly Humidity Conditioning Followed By Dielectric Test 51 5.23 Short Circuit Withstand Test 51 5.24 Latching Mechanism Test .52 5.25 Abnormal Overload Test 5

25、3 5.26 Temperature Test 54 5.27 Continuity Impedance Test 54 5.28 Bonding (Fault Current) Test.54 JULY 20, 2018 NMX-J-005-ANCE CAN/CSA-C22.2 NO. 111-18 UL 20 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.29 Mounting Yoke Resistance Test

26、55 5.30 Combination Wire Binding/Pressure-Type Terminal Assembly Test .56 5.31 Inrush Current .57 6 Ratings .58 7 Markings59 7.1 General 59 7.2 Supplementary Markings .61 7.3 Location 64 7.4 Tungsten .64 7.5 AC-Only Identication 64 7.6 Switch Termination Restrictions .65 7.7 For Use with Electronic

27、Ballasts .67 8 Self-Contained Switches for Use Without a Separate Outlet Box.67 8.1 General 67 8.2 Construction 68 8.3 Performance Testing.70 8.4 Markings and Instructions 77 SUPPLEMENT SA - AC ONLY FLUSH SWITCH WITH INTEGRAL POWER SUPPLY WITH CLASS 2 OUTPUT CONNECTORS INTRODUCTION SA1 Scope .85 SA2

28、 Glossary .85 CONSTRUCTION SA3 General 86 SA4 Polymeric Enclosure .86 SA5 Spacings .86 SA6 Terminals and Leads 87 PERFORMANCE SA7 Temperature Test .87 SA8 Class 2 Output Power Supply.91 SA9 Assembly Test 91 SA10 Installation Instructions92 SA11 User Instructions .92 SA12 Markings 92 ANNEX A (Normati

29、ve) Standards for Components A1 Component Standards 94 JULY 20, 2018 NMX-J-005-ANCE CAN/CSA-C22.2 NO. 111-18 UL 20 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Annex B (Informative) Canadian Requirements for CO/ALR Switches B1 General .9

30、6 B2 Heat Cycling with Wire Disturbance.98 B3 Heat Cycling with Vibration 99 B4 Environmental.100 B5 Stripping Torque 101 JULY 20, 2018 NMX-J-005-ANCE CAN/CSA-C22.2 NO. 111-18 UL 20 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface Th

31、is is the harmonized ANCE, CSA Group, and UL standard for General-Use Snap Switches. It is the rst edition of NMX-J-005-ANCE, fth edition of CAN/CSA-C22.2 No. 111, and the fourteenth edition of UL 20. This edition of CAN/CSA-C22.2 No. 111 supersedes the previous edition(s) published on May 10, 2010.

32、 This edition of UL 20 supersedes the previous edition(s) published on May 10, 2010. This harmonized standard was prepared by the Association of Standardization and Certication, (ANCE), CSA Group and Underwriters Laboratories Inc. (UL). The efforts and support of the NEMA (National Electrical Manufa

33、cturers Association), EFC (Electro-Federation of Canada), and the CANENA Technical Harmonization Committee for Snap Switches, THSC 23-B, are gratefully acknowledged.) This standard is considered suitable for use for conformity assessment within the stated scope of the standard. This standard was rev

34、iewed by the CSA Integrated Committee on Wiring Devices for Household and General Use, under the jurisdiction of the CSA Technical Committee on Wiring Products and the CSA Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the CSA Technical Committe

35、e. This standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group. Application of Standard Where reference is made to a specic number of samples to be tested, the speci

36、ed number is to 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 its suitability for their particular purpose. Level of Harmoniza

37、tion This standard is published as an equivalent standard for ANCE, CSA Group and UL. 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 governmental regulations as well as those recogn

38、ized 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 word except for editorial chang

39、es. 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 rulesofthestandardsdevelopmentorganization.Ifmorethanoneinterpretationofthe

40、literaltexthasbeen identied, a revision is to be proposed as soon as possible to each of the standards development organizations to more accurately reect the intent. JULY 20, 2018 NMX-J-005-ANCE CAN/CSA-C22.2 NO. 111-18 UL 20 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRI

41、BUTION WITHOUT PERMISSION 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 (CE

42、Code), Part I, and and intended to be permanently connected in accordance with the NEC and the CE Code, Part I. In Canada, requirements for switches for connection to aluminum (Al) conductors used in accordance with the CE Code, Part I, and intended for connection to wiring systems recognized by the

43、 CE Code, Part I, are covered in Annex B. 1.2 This 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

44、30 A at 347 VAC or less. 1.3 This Standard applies 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 exibl

45、e cord and provided with one on and one off 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 Stan

46、dard applies to self-contained switches intended 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

47、in xtures to control incandescent lighting or 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 wi

48、ring. 1.9 This Standard does not apply to: a) 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 con

49、trol equipment specied in the Standard for Industrial 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 Switches for Appliances Part 1: General Requirements, UL 61058-1, and CSA Standard C22.2 No. 55; and JULY 20, 2018 NMX-J-005-ANC