UL 1008A-2017 UL Standard for Safety Transfer Switch Equipment Over 1000 Volts (Second Edition).pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1008A Transfer Switch Equipment, Over 1000 Volts STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED M

2、ATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Transfer Switch Equipment, Over 1000 Volts, UL 1008A Second Edition, Dated September 5, 2017 Summary of Topics The Second edition of UL 1008A is being issued as a Binational Standard

3、 with CSA and has been renamed the Standard for Transfer Switch Equipment, Over 1000 Volts. The new requirements are substantially in accordance with Proposal(s) on this subject dated May 27, 2016 and May 5, 2017. All rights reserved. No part of this publication may be reproduced, stored in a retrie

4、val system, 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 merchan

5、tability or tness for any purpose. In no event 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 author

6、ized UL representative has been advised of the 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 ho

7、ld UL harmless 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. SEPTEMBER 5, 2017 UL 1008A tr1UL COPYRI

8、GHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 5, 2017 UL 1008A tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CSA Group CSA C22.2 No. 178.3-17 First Editi

9、on Underwriters Laboratories Inc. UL 1008A Second Edition Transfer Switch Equipment, Over 1000 Volts September 5, 2017 ANSI/UL 1008A-2017UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Commitment for Amendments This standard is issued jointl

10、y by 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 CSA Group or UL at anytime. Revisions to this standard will be made only after processing according to the s

11、tandards development procedures of 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. ISBN 978-1-4883-0044-8 2017 CSA Group All rights reserved. No part of this publication may be reproduced i

12、n any form whatsoever without the prior permission of the publisher. This Standard is subject to periodic review, and suggestions for its improvement will be referred to the appropriate committee. To submit a proposal for change, please send the following information to inquirescsagroup.org and incl

13、ude 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 Store at shop.csa.ca or call toll-fr

14、ee 1-800-463-6727 or 416-747-4044. Copyright 2017 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, and rights regarding those Standards

15、 shall remain the sole and exclusive property of UL. This ANSI/UL Standard for Safety consists of the Second Edition. The most recent designation of ANSI/UL 1008A as an American National Standard (ANSI) occurred on September 5, 2017. ANSI approval for a standard does not include the Cover Page, Tran

16、smittal Pages, Title Page (front and back), or the Preface. Comments or proposals for revisions on any part 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 https:/. To purchas

17、e UL Standards, visit ULs Standards Sales Site at http:/ HowToOrder.aspx or call toll-free 1-888-853-3503.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS PREFACE 6 INTRODUCTION 1 Scope .7 2 General Requirements.8 3 Units of Measurem

18、ent .8 4 Reference Publications 8 5 Denitions9 CONSTRUCTION 6 General.12 7 Enclosure .12 8 Insulating Material .13 9 Mounting of Parts 13 10 Guarding and Accessibility of Live Parts .14 11 Current-Carrying Parts 14 12 Field Wiring Terminals for Control Circuits .15 13 Internal Wiring15 13.1 General

19、.15 13.2 Barriers dening wireways.16 13.3 Wiring in circuits below 1000 V 17 13.4 Wiring in circuits operating at 1000 V and higher .17 14 Isolation .17 14.1 Isolating means 17 14.2 Isolation of circuits18 15 Grounding and Bonding .18 15.1 Terms 18 15.2 Grounding of exposed metal parts19 15.3 Ground

20、 bus19 15.4 Provision for ground termination19 15.5 Grounding of drawout elements 20 15.6 Grounding of instrument and control circuits .20 15.7 Grounding and bonding of neutral circuits for service entrance transfer switches .20 16 Operating Mechanism .20 16.1 General .20 16.2 Transfer switch operat

21、or interlocks .22 16.3 Location and protection of transfer control circuits 23 16.4 Transfer switches for emergency use .23 17 Overcurrent and Ground-Fault Protection 24 17.1 Overcurrent protection 24 17.2 Ground-fault protection25 18 Receptacles25 19 Spacings 25 19.1 General .25 19.2 Spacings on pr

22、inted-wiring boards operating at 1500 V or less.26 20 Wiring Space.28 21 Interlocking 28 22 Transfer Switches for Service Equipment Use Requirements for All Countries .29 SEPTEMBER 5, 2017 CSA C22.2 NO. 178.3-17 UL 1008A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTIO

23、N WITHOUT PERMISSION FROM UL 23 Service Equipment for Use in the United States 31 23.1 Service disconnecting means 31 23.2 Grounding and bonding of neutral circuits .32 24 Service Equipment for Use in Canada 32 24.1 Service disconnecting means 32 24.2 Grounding and bonding of neutral circuits .33 25

24、 Transfer Switches Comprised of Circuit Breakers in Switchgear 33 26 Transfer Switches Comprised of Contactors34 27 Transfer Switches Comprised of Load Interrupter Switches in Metal Enclosed Switchgear 34 PERFORMANCE 28 General35 29 Transfer Switches Comprised of Circuit Breakers in Switchgear 35 30

25、 Transfer Switches Comprised of Contactors36 31 Transfer Switches Comprised of Load Interrupting Switches in Metal Enclosed Switchgear 36 32 Other Transfer Switches .36 33 Operations Tests .37 33.1 Normal operational tests 37 33.2 Closed transition switch normal operation test .38 34 Overvoltage Tes

26、t .39 35 Undervoltage Test 39 36 Range of Operating Voltages.40 37 Overload Test 40 38 Electrical Endurance Test41 39 Temperature Test.42 40 Mechanical Endurance Tests.44 41 Dielectric Voltage-Withstand Test .44 41.5 Test Across Isolating Distance .45 42 Partial Discharge Testing Procedures .46 42.2

27、 Test procedure.46 43 Dielectric Voltage-Withstand Test (Repeated) 46 44 Withstand Test .46 45 Closing Test .48 46 Short-Time Current Rating Test 48 47 Momentary Withstand Current Test .49 47.1 General .49 47.2 Momentary tests on primary bus and connections 50 47.3 Momentary tests on ground bus51 48

28、 Dielectric Voltage-Withstand Test (Reduced Level) .51 49 Switching Capacity Test Isolating Means.51 50 Isolating Means Interlock Integrity Test 52 51 Transfer Switch Operator Interlock Integrity Test .52 52 Impulse Voltage Withstand Tests .52 52.7 Test across isolating distance53 53 Enclosure Groun

29、d Integrity Test 54 RATINGS 54 Ratings .55 SEPTEMBER 5, 2017 CSA C22.2 NO. 178.3-17 UL 1008A 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MANUFACTURING AND PRODUCTION TESTS 55 Power-Frequency Voltage Withstand Test .56 55.1 General .56 5

30、5.2 Tests at the Common value test voltage specied in Table 16, Column 2 .57 55.3 Tests at the Across the isolating distance voltage specied in Table 16, Column 3 .57 MARKINGS 56 Markings.58 56.4 Marking of adjustable and nonadjustable features 58 57 Service Equipment Markings .60 57.1 Markings for

31、service equipment in the United States60 57.2 Markings for service equipment in Canada 61 58 Permanence of Marking .62 59 Installation Test Procedures62 60 Transfer Switches for Fire Pump Service 62 TABLES FIGURES Annex A (Informative) Standards for Components Annex B (Normative) References ANNEX C

32、(Normative) Bypass Transfer Switches C1 Scope.85 C2 General .85 C3 Performance General .85 C4 Normal Operation 86 C5 Overload 86 C6 Temperature .86 C7 Endurance.86 C8 Dielectric Voltage-Withstand .86 C9 Short-Circuit Withstand86 C10 Short-Time Current Rating Test (Optional)86 C11 Short-Circuit Closi

33、ng .86 C12 Dielectric Voltage-Withstand (Reduced Level).87 C13 Rating .87 C14 Marking 87 ANNEX D (Informative) French Translations of Markings SEPTEMBER 5, 2017 CSA C22.2 NO. 178.3-17 UL 1008A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL

34、 PREFACE This is the harmonized CSA Group, and UL standard for Transfer Switch Equipment Over 1000 Volts. It is the First edition of CSA C22.2 No. 178.3, and the Second edition of UL 1008A. This edition of UL 1008A supersedes the First edition titled, Medium-Voltage Transfer Switches, published on M

35、arch 30, 2012. This harmonized standard was prepared by the CSA Group and Underwriters Laboratories Inc. (UL). The efforts and support of the Technical Harmonization Subcommittee, THSC 121A WG8, Transfer Switches over 750V, on the Harmonization of Electrotechnical Standards of the Nations of the Ame

36、ricas (CANENA), 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 Subcommittee on High Voltage Transfer Switches, under the jurisdiction of the CSA Technical Committee on

37、Industrial Products (TCIP) and the CSA Strategic Steering Committee on requirements for Electrical Safety (SCORES), 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. App

38、lication of Standard Where reference is made to a specic number of samples to be tested, the specied 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 t

39、he users of the standard to judge its suitability for their particular purpose. Level of Harmonization This standard is published as an equivalent standard for CSA Group and UL. An equivalent standard is a standard that is substantially the same in technical content, except as follows: Technical nat

40、ional differences are allowed for codes and governmental regulations as well as 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

41、 the country considers appropriate. Presentation is word for word except for editorial changes. Reasons for Differences From IEC There is no corresponding IEC standard. Interpretations The interpretation by the standards development organization of an identical or equivalent standard is based on the

42、 literal text to determine compliance with the standard in accordance with the procedural rules of the standards development organization. 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 orga

43、nizations to more accurately reect the intent. SEPTEMBER 5, 2017 CSA C22.2 NO. 178.3-17 UL 1008A 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover automatic, non-automatic, and manual transfer

44、 switches, operating at voltages of greater than 1000 Vac, and intended for use in non-hazardous locations in accordance with Annex B, Item 1, the National Electrical Code, ANSI/NFPA 70, or the Canadian Electrical Code, CSA C22.1, Part 1, to provide for power as follows: a) Automatic transfer switch

45、es for use in emergency systems in: 1) Emergency systems in accordance with the Standard for Emergency Electrical Power Supply for Buildings, CSA C282-15; 2) Health care facilities in accordance with Rule 24-304 of the Canadian Electrical Code (CEC) Part I; 3) Articles 517, Health Care Facilities, a

46、nd 700, Emergency Systems, of the National Electrical Code, ANSI/NFPA 70 (refer to Annex B, Item 1); and 4) The Health Care Facilities Code, ANSI/NFPA 99, (refer to Annex B, Item 12). Note: Transfer switches for optional standby systems are not recognized in Canada. b) Transfer switches for use in o

47、ptional standby systems in accordance with Article 702 of the National Electrical Code, ANSI/NFPA 70 (refer to Annex B, Item 1). Note: Automatic transfer switches for optional standby systems are not recognized in Canada. c) In legally required standby systems in accordance with Article 701 of the N

48、ational Electrical Code, ANSI/NFPA 70(refer to Annex B, Item 1). Note: Legally-required standby systems are not recognized in Canada. d) Automatic transfer switches for use in accordance with the Standard for the Installation of Stationary Pumps for Fire Protection, ANSI/NFPA 20 or the Standard for

49、Fire Pump Controllers, CSA C22.2 No. 263, (refer to Annex B, Item 2). 1.2 These requirements cover transfer switches rated greater than 1000 V to 46 kV. 1.3 These requirements cover transfer switches together with their associated control devices including, but not limited to, voltage sensing relays, frequency sensing relays, and time delay relays. 1.4 An automatic transfer switch as covered by these requirements is a device that automatically transfers a common load from a normal