ANSI UL 60079-7-2017 UL Standard for Safety Explosive Atmospheres C Part 7 Equipment protection by increased safety e (Fifth Edition Reprint with Revisions Through and Including .pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 60079-7 Explosive atmospheres Part 7: Equipment protection by increased safety e STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PE

2、RMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Explosive Atmospheres Part 7: Equipment Protection by Increased Safety e, UL 60079-7 Fifth Edition, Dated February 24, 2017 Summary of Topics This rev

3、ision of ANSI/UL 60079-7 is being issued to correct editorial references in 5.3.5.3.1DV and 6.2.3.2.3DV. The requirements are substantially in accordance with Proposal(s) on this subject dated June 3, 2016 and December 16, 2016. For further information regarding Summary of Requirements, please visit

4、 https:/ THIS FIFTH EDITION REPLACES THE FOURTH EDITION. AS OF FEBRUARY 24, 2022, UL 60079-7 EDITION 4 WILL BE WITHDRAWN. 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 photocopying, re

5、cording, 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 special, incidental

6、, 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 no event shall

7、 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 judgment (in

8、cluding reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. APRIL 21, 2017 UL 60079-7 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FRO

9、M UL APRIL 21, 2017 UL 60079-7 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 24, 2017 (Title Page Reprinted: April 21, 2017) 1 UL 60079-7 Standard for Explosive Atmospheres Part 7: Equipment Protection by I

10、ncreased Safety e First Edition December, 2002 Second Edition March, 2007 Third Edition Not Printed Fourth Edition October, 2008 Fifth Edition February 24, 2017 This ANSI/UL Standard for Safety consists of the Fifth Edition including revisions through April 21, 2017. The most recent designation of A

11、NSI/UL 60079-7 as an American National Standard (ANSI) occurred on February 24, 2017. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page or Preface. The National Difference Page and IEC Foreword are also excluded from the ANSI approval of IEC-based standards.

12、 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:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor

13、 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 exclusive property of UL. COPYRIGHT 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 60079-7-2017UL COPYRIGHTED MATERIAL NOT AUT

14、HORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 24, 2017 UL 60079-7 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS Preface (UL) 6 National Differences 8 FOREWORD 9 1 Scope

15、.16 2 Normative references .17 3 Terms and denitions 20 4 Constructional requirements .25 4.1 Level of Protection 25 4.2 Electrical connections 26 4.3 Clearances .34 4.4 Creepage distances .35 4.5 Printed wiring boards with conformal coating, Level of Protection “ec” .45 4.6 Solid electrical insulat

16、ing materials 45 4.7 Windings .46 4.8 Temperature limitations 48 4.9 Wiring internal to equipment 50 4.10 Degrees of protection provided by enclosures .50 4.11 Fasteners .51 4.12ADV.1.1 Arcing or sparking contacts 51 5 Supplementary requirements for specic electrical equipment .52 5.1 General 52 5.2

17、 Electrical machines 52 5.3 Luminaires, hand lights, or caplights .65 5.4 Analog measuring instruments and instrument transformers 78 5.5 Transformers other than instrument transformers 80 5.6 Supplementary requirements for equipment incorporating cells and batteries .80 5.7 General purpose connecti

18、on and junction boxes 91 5.8 Resistance heating equipment (other than trace heating systems) .92 5.9 Supplementary requirements for fuses .96 5.10 Other electrical equipment .97 6 Type verications and type tests .98 6.1 Dielectric strength .98 6.2 Rotating electrical machines 99 6.3 Luminaires 102 6

19、.4 Measuring instruments and instrument transformers 110 6.5 Transformers other than instrument transformers .111 6.6 Verication and tests for cells and batteries of Level of Protection “eb” .111 6.7 Verication and tests for cells and batteries of Level of Protection “ec” 114 6.8 General purpose con

20、nection and junction boxes .115 6.9 Resistance heating equipment .116 6.10 Terminal insulating material tests 117 7 Routine verications and routine tests .118 7.1 Dielectric tests .118 7.2 Dielectric tests for batteries 118 7.3 Inter-turn overvoltage tests 118 8 Ex Component certicates .118 8.1 Gene

21、ral .118 FEBRUARY 24, 2017 UL 60079-7 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8.2 Terminals .119 9 Marking and instructions .119 9.1 General marking .119 9.2 Ex Component enclosures 121 9.3 Instructions for use .121 9.4 Warning mark

22、ings 123 10 Documentation 123 Annex A (normative) Temperature determination of electrical machines Methods of test and of calculation A.1 General 125 A.2 Determination of maximum service temperatures .125 A.2.1 Rotor temperature normal operation 125 A.2.2 Winding temperature normal operation 126 A.3

23、 Determination of maximum surface temperatures .126 A.3.1 General .126 A.3.2 Locked rotor tests 126 A.4 Optional calculation of maximum surface temperature .127 A.4.1 General .127 A.4.2 Rotor temperature 128 A.4.3 Stator temperature .128 A.5 Determination of t E time .128 A.6 Arduous starting condit

24、ions 129 A.7 Motors operated with a converter .129 Annex B (normative) Type tests for specic forms of resistance heating devices or resistance heating units (other than trace heater) B.1 Resistance heating devices subjected to mechanical stresses 130 B.2 Resistance heating devices or units intended

25、for immersion 130 B.3 Resistance heating devices or units having hygroscopic insulating material 130 B.4 Verication of limiting temperature of resistance heating devices (other than trace heaters) .130 B.4.1 General .130 B.4.2 Safety devices .131 B.4.3 Resistance heating unit of stabilized design .1

26、31 B.4.4 Heating device with temperature self-limiting characteristic 132 Annex C (informative) Cage motors Thermal protection in service Annex D (informative) Resistance heating devices and units Additional electrical protection D.1 Objective 134 D.2 Method of protection 134 FEBRUARY 24, 2017 UL 60

27、079-7 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Annex E (informative) Combinations of terminals and conductors for general purpose connection and junction boxes E.1 General 135 E.2 Maximum dissipated power method .135 E.3 Dened arrang

28、ement method .136 Annex F (normative) Dimensions of copper conductors Annex G (normative) Test procedure for T5 (only 8 W), T8, T10 and T12 lamps G.1 Asymmetric pulse test .139 G.1.1 General .139 G.1.2 Test procedure 139 G.2 Asymmetric power test 142 G.2.1 General .142 G.2.2 Test procedure 142 Annex

29、 H (normative) Alternative separation distances for Level of Protection “ec” equipment under controlled environments H.1 General 145 H.2 Specic Conditions of Use .146 H.3 Control of pollution access .146 H.4 Voltage limitation .146 H.5 Control of overvoltages and transient protection 146 H.6 Alterna

30、tive separation distances 147 Annex I (informative) Application, installation, and testing considerations for Level of Protection “ec” asynchronous machines I.1 Surface temperature .148 I.2 Starting .148 I.3 Rated voltage and surface discharges 149 Annex J (informative) Luminaires incorporating LEDs

31、 J.1 LEDs for EPL Gb .150 J.2 LEDs for EPL Gc 150 Bibliography FEBRUARY 24, 2017 UL 60079-7 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface (UL) This UL Standard is based on IEC Publication 60079-7: fth edition Explosive atmospheres

32、 Part 7: Equipment protection by increased safety e. IEC publication 60079-7 is copyrighted by the IEC. The text, gures and tables of IEC Publication Explosive atmospheres - Part 7: Equipment protection by increased safety e, IEC 60079-7, copyright June 2015 are used in this Standard with the consen

33、t of the IEC and the American National Standards Institute (ANSI). The IEC copyrighted material has been reproduced with permission from ANSI. ANSI should be contacted regarding the reproduction of any portion of the IEC material. The IEC Foreword and Introduction are not a part of the requirements

34、of this Standard but are included for information purposes only. Copies of IEC Publication 60079-7 may be purchased from ANSI, 11 West 42nd Street, New York, New York, 10036, (212) 642-4900. Note Although the intended primary application of this Standard is stated in its Scope, it is important to no

35、te that it remains the responsibility of the users of the Standard to judge its suitability for their particular purpose. The following people served as members of STP 60079 and participated in the review of this standard: NAME COMPANY *B. Zimmermann, Chair R Stahl Inc. *T. Adam FM Approvals LLC R.

36、Allen Honeywell Inc. D. Ankele UL LLC S. Bihler-Lopez CML Inc. S. Blais Appleton Group K. Boegli KBB Consulting R. Brownlee Pepperl + Fuchs Inc. D. Burns Shell P&T Innovation / R&D R. Chalmers Industrial Scientic Corp. *C. Coache National Fire Protection Association D. Cook Shelby County Department

37、of Development Services M. Coppler Det Norske Veritas Certication Inc. D. Mario Consultant T. Dubaniewicz NIOSH G. Edwards Rosemount Inc. M. Ehrmann R Stahl Inc M. Egloff Montana Tech, University of Montana D. El Tawy Solar Turbines Inc. *A. Engler Det Norske Veritas DNV Z. Fosse DEKRA Certication I

38、nc G. Gurinder Gurinder Garcha Consulting D. Grady Talema Group R. Holub DuPont P. House Thermon Mfg. Co. *B. Johnson Thermon Mfg. Co. R. Johnson Source IEC *P. Kelly UL LLC S. Kiddle ABB Inc *P. Kovscek Industrial Scientic Corp. A. Kreider Phoenix Contact Development & Manufacturing Inc. *J. Kuntsc

39、her Thermon Mfg Co. FEBRUARY 24, 2017 UL 60079-7 6 Table Continued on Next PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Table Continued NAME COMPANY W. Lawrence FM Approvals LLC E. Leubner Eatons Crouse-Hinds Business W. Lowers WCL Co

40、rp. *N. Ludlam FM Approvals Ltd. R. Martin USCG *R. Masek CSA Group E. Massey Baldor Electric Co. W. McBride Northern Electric Co. T. Michalski Killark Electric Mfg. Co. J. Miller Detector Electronics Corp. *O. Murphy Honeywell Inc. D. Nachtigall Rockwell Automation D. Nedorostek Bureau of Safety &

41、Environmental Enforcement (BSEE) A. Page Bud Page Consultant T. Patel Littelfuse Inc. P. Rigling Measurement Technology Ltd. *K. Robinson Occupational Safety and Health Adm. J. Ruggieri General Machine Corp. *J. Scheller Baldor Electric Co. P. Schimmoeller CSA Group *T. Schnaare Rosemount Inc. *A. S

42、chnuelle CML Inc. R. Seitz ARTECH Engineering S. Sharma Lindsay Corp. R. Sierra US Coast Guard M. Spencer Transcanada / Columbia Pipeline Group G. Steinman Thomas & Betts *R. Teather Det Norske Veritas Certication Inc. W. VanHill Intertek D. Wechsler American Chemistry Council R. Wigg E-x Solutions

43、International Pty Ltd. *K. Wolf Intertek T. Woods GE Oil & Gas R. Zalosh Firexplo * Non-voting member FEBRUARY 24, 2017 UL 60079-7 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL National Differences National Differences from the text of In

44、ternational Electrotechnical Commission (IEC) Publication 60079-7, Explosive atmospheres Part 7: Equipment protection by increased safety e copyright 2015 are indicated by notations (differences) and are presented within the body of the UL printed standard in bold text with legislative mark-ups (str

45、ike-out and underline). There are ve types of National Differences as noted below. The difference type is noted on the rst line of the National Difference in the standard. The standard may not include all types of these National Differences. D1 These are National Differences which are based on basic

46、 safety principles and requirements, elimination of which would compromise safety for consumers and users of products. D2 These are national differences from IEC requirements based on existing safety practices. These requirements reect national safety practices, where empirical substantiation (for t

47、he IEC or national requirement) is not available or the text has not been included in the IEC standard. DC These are National Differences based on the component standards and will not be deleted until a particular component standard is harmonized with the IEC component standard. DE These are Nationa

48、l Differences based on editorial comments or corrections. DR These are National Differences based on the national regulatory requirements. Each national difference contains a description of what the national difference entails. Typically one of the following words is used to explain how the text of

49、the national difference is to be applied to the base IEC text: Addition / Add - An addition entails adding a complete new numbered clause, subclause, table, gure, or annex. Addition is not meant to include adding select words to the base IEC text. Deletion / Delete - A deletion entails complete deletion of an entire numbered clause, subclause, table, gure, or annex without any replacement text. Modication / Modify - A modication