UL 674-2011 UL Standard for Safety Electric Motors and Generators for Use in Hazardous (Classified) Locations (Fifth Edition Reprint with Revisions Through and Including May 19 201_1.pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 674 Electric Motors and Generators for Use in Hazardous (Classied) LocationsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYR

2、IGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Electric Motors and Generators for Use in Hazardous (Classied) Locations,UL 674 Fifth Edition, Dated May 31, 2011 Summary of Topics This revision to ANSI/UL 674 is being issu

3、ed to update the title page to reect the reaffirmation of its ANSI approval. No technical changes in requirements have been made. As noted in the Commitment for Amendments statement located on the back side of the title page, CSA, UL, and ANCE are committed to updating this harmonized standard joint

4、ly. CSA and UL will issue revisions to this standard bearing their date of issue. ANCE will incorporate the same revisions of the standard bearing the same date of issue as the CSA and UL pages. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a

5、 vertical line in the margin. These requirements are substantially in accordance with Proposal(s) on this subject dated June 26, 2015. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical pho

6、tocopying, 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 will UL be liable for any specia

7、l, 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 possibility of such damage. In n

8、o 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, expense, liability, damage, claim, or

9、 judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. NOVEMBER 6, 2015 UL 674 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PER

10、MISSION FROM UL NOVEMBER 6, 2015 UL 674 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-652-ANCE First Edition CSA Group CSA C22.2 No. 145-11 Third Edition Underwri

11、ters Laboratories Inc. UL 674 Fifth Edition Electric Motors and Generators for Use in Hazardous (Classied) Locations May 31, 2011 (Title Page Reprinted: November 6, 2015) ANSI/UL 674-2011 (R2015)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM U

12、L Commitment for Amendments This standard is issued jointly by the Association of Standardization and Certication (ANCE), 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 ANCE, CSA,

13、or UL at any time. Revisions to this standard will be made only after processing according to the standards development procedures of ANCE, 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. ANCE will in

14、corporate the same revisions of the standard bearing the same date of issue as the CSA and UL pages. Copyright 2011 ANCE Rights reserved in favor of ANCE. ISBN 978-1-55491-633-7 2011 CSA Group All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior

15、 permission of the publisher. CSA Standards are subject to periodic review, and suggestions for their improvement will be referred to the appropriated committee. To submit a proposal for change to CSA Standards, please send the following information to inquirescsa.ca and include Proposal for change

16、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 Standards and related publications, visit CSAs Online Store at www.shop.csa.ca or call toll-free 1-800-463-6727 or 416-747-4044

17、. Copyright 2015 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 shall remain the sole and exclus

18、ive property of UL. This ANSI/UL Standard for Safety consists of the Fifth Edition including revisions through November 6, 2015. The most recent designation of ANSI/UL 674 as an American National Standard (ANSI) occurred on November 6, 2015. ANSI approval for a standard does not include the Cover Pa

19、ge, Transmittal Pages, Title Page (front and back), or the Preface. Any other portions of this ANSI/UL standard that were not processed in accordance with ANSI/UL requirements are noted at the beginning of the impacted sections. The Department of Defense (DoD) has adopted UL 674 on November 6, 1987.

20、 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 submitted via a Proposal Request in ULs On-Line Collaborative Standards De

21、velopment 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 UL CONTENTS Preface .6 1 Scope .8 2 Conditions for Use 8 3 Normative Refer

22、ences .9 4 Dated and Undated References 9 5 Denitions .9 6 Components 10 7 Units of Measurement 10 8 Terminology .10 9 Zone and Group Equivalency .10 9.1 Class I, Zone 1, Group IIA 10 9.2 Class I, Zone 1, Group IIB 11 9.3 Class I, Zone 1, Group IIB+H2 11 9.4 Zone 20 and 21 .11 10 Enclosures 11 10.1

23、Material .11 10.2 Porosity in castings 12 10.3 Thickness 12 10.4 Strength 13 11 Joints in Enclosure 13 11.1 General .13 11.2 Groups C and D locations 14 11.3 Group B locations .15 11.4 Class II Locations .17 11.5 Class I and II Locations - Main poles and interpoles of D.C. motors .18 12 Holes in Enc

24、losure 18 13 Shaft Openings .19 13.1 General .19 13.2 Groups F and G locations 20 13.3 Group E locations .21 14 Drain and Breather Plugs in Enclosure 21 15 Air-Gap Gauge Plugs in Enclosure 21 16 Devices with Operating Rods or Spindles 21 17 Protection Against Corrosion 22 17.1 General .22 17.2 Subme

25、rsible sewage-pump motor .22 18 Materials Applied to Joint Surfaces 22 19 Field-Wiring Connections .22 19.1 Permanently connected motors 22 19.2 Field wiring leads 24 19.3 Equipment grounding terminals and leads 27 20 Cord-Connected Motors .28 20.1 General .28 20.2 Terminal enclosure 29 20.3 Conduct

26、or seal 29 20.4 Packing gland 29 20.5 Strain relief .30 20.6 Bonding for grounding .30 20.7 Equipment grounding 31 MAY 31, 2011 NMX-J-652-ANCE CSA C22.2 NO. 145-11 UL 674 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 20.8 Attachment of th

27、readed parts .32 21 Assemblies of Equipment 32 21.1 General .32 21.2 Electric brake .32 22 External Fans and Fan Guards .32 22.1 Materials 32 22.2 Fan-cooled motor .32 23 Gasoline Submersible Motors 33 23.1 General .33 23.2 Lubrication .33 23.3 Mechanical seal .33 24 Leakage Detectors 33 24.1 Submer

28、sible sewage-pump motor 33 24.2 Cord-connected submersible sewage-pump motor .33 25 Maximum External Surface Temperatures 33 26 Devices for Limiting External Surfaces Temperatures 34 27 Spacings .34 27.1 Motors rated 1500 volts or less 34 27.2 Motors rated more than 1500 volts 37 28 Test Voltages an

29、d Test Conditions 37 29 Instrumentation Temperature Measurements 38 30 Variable-Frequency Inverter-Drive Motors 39 31 Temperature Tests General .39 32 Temperature Tests on Sinewave Power for Single Speed or Multi-Speed Motors 39 32.1 Normal temperature test 39 32.2 Running-overload test .40 32.3 Run

30、ning-overload to burnout test 40 32.4 Single-phasing test 40 32.5 Locked-rotor test 40 32.6 72-Hour locked-rotor test .41 32.7 Air test .41 32.8 Dry-dust blanket test .41 32.9 Moist-dust blanket test Group G locations 42 33 Temperature Tests for Variable-Frequency Inverter-Drive Motors .42 33.1 Norm

31、al temperature test 42 33.2 Running-overload test .43 33.3 Running-overload to burnout test 43 33.4 Locked-rotor test 43 33.5 Air test .44 33.6 Dry-dust blanket test .44 33.7 Moist-dust blanket test Group G locations 45 33.8 Tests on fan-duty and air-over motors with temperature-limiting devices .45

32、 34 Dielectric-Voltage Withstand Test .45 35 Dust-Penetration Test 46 36 Explosion Test 47 36.1 General .47 36.2 Explosion pressure test 48 36.3 Flame propagation test 49 36.4 Exceptions for non-standard joints .49 37 Over Pressure Test on Enclosures 49 38 Tests on Temperature-Limiting Devices for L

33、imiting External Surface Temperature 50 38.1 Arc-rupturing tests for thermal cut-off device in D.C. motor circuit 50 38.2 Temperature-limiting device in the motor-control circuit 50 MAY 31, 2011 NMX-J-652-ANCE CSA C22.2 NO. 145-11 UL 674 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTI

34、ON OR DISTRIBUTION WITHOUT PERMISSION FROM UL 38.3 Overload test .50 38.4 Endurance test 50 38.5 Calibration test 51 39 Secureness Test on Conduit Hubs 51 40 Electrical-Resistance Test 51 41 Accelerated-Aging Test on Bushings .51 42 Cord-Pull Test 52 43 Rough-Usage Test 52 44 Drop Test 53 45 Gasolin

35、e-Leakage Test .53 46 Non-Metallic Fans and Fan Guards Test .53 46.1 General .53 46.2 Conductivity test 53 46.3 Accumulation of static electricity test .54 47 Pull Test on Tubes 55 48 Sealing Compounds Test .55 49 Low Ambient-Duty Motors 57 49.1 General .57 49.2 Construction 57 49.3 Explosion test .

36、58 49.4 Drop test on lead seal .58 49.5 Manufacturing and Production Tests Dielectric Voltage-Withstand Test .58 50 Grounding-Continuity Test .59 51 Markings .59 Annex A (normative) Standard References Annex B (informative) Standards for components B1 Component Standards 92 Annex C (normative) Const

37、ruction for Waiver of Explosion Tests C1 Explosion tests per the exception to 36.1.2 93 C2 Joints .93 C2.1 General 93 C2.2 Threaded Joints 93 C2.3 Bolts in Joint Width .93 C2.4 Through-bolts 94 C3 Shaft Openings 94 C3.1 Class I Locations 94 MAY 31, 2011 NMX-J-652-ANCE CSA C22.2 NO. 145-11 UL 674 5UL

38、 COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface This is the harmonized ANCE, CSA, and UL standard for electrical motors and generators. It is the rst edition of NMX-J-652-ANCE, the third edition of CSA-C22.2 No. 145, and the fth editio

39、n of UL 674. This edition of CSA C22.2 No. 145 supersedes the previous editions published in 1972 and 1986. This edition of UL 674 supersedes the previous edition published in 2003. This harmonized standard was last jointly revised on August 12, 2011. This harmonized standard was prepared by the Ass

40、ociation of Standardization and Certication (ANCE), the Canadian Standards Association (CSA), and Underwriters Laboratories Inc. (UL). The efforts and support of the CANENA Technical Harmonization Committee are gratefully acknowledged. This standard is considered suitable for use for conformity asse

41、ssment within the stated scope of the standard. This standard was reviewed by the CSA Integrated Committee on Hazardous Location Products, under the jurisdiction of the CSA Technical Committee on Industrial Products and the CSA Strategic Steering Committee on Requirements for Electrical Safety, and

42、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 reference is made to a specic number of samples to be tested, the specied number is to be considered a minimum quanti

43、ty. 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 harmonization This standard uses the IEC format but is

44、not based on, nor is it to be considered equivalent to, an IEC standard. This standard is published as an equivalent standard for ANCE, CSA, and UL. An equivalent standard is a standard that is substantially the same in technical content, except as follows: Technical national differences are allowed

45、 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 the country considers approp

46、riate. Presentation is word for word except for editorial changes. Reasons for differences from IEC This standard provides requirements for electric motors and generators in accordance with the codes of Canada, Mexico, and the United States. At present there is no IEC standard for electric motors an

47、d generators for use in accordance with these codes. Therefore, this standard does not employ any IEC standard for base requirements. NOVEMBER 6, 2015 NMX-J-652-ANCE CSA C22.2 NO. 145-11 UL 674 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM U

48、L 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 organization. If more than one interpretat

49、ion 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. NOVEMBER 6, 2015 NMX-J-652-ANCE CSA C22.2 NO. 145-11 UL 674 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 1 Scope 1.1 This standard applies to electric motors and generators or submersible and nonsubmersible