UL 60079-18-2015 UL Standard for Safety Explosive atmospheres C Part 18 Equipment protection by encapsulation m (Fourth Edition Reprint with Revisions Through and Including May 25 .pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 60079-18 Explosive Atmospheres Part 18: Equipment Protection by Encapsulation “m”UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL

2、COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Explosive Atmospheres Part 18: Equipment Protection by Encapsulation “m”, UL 60079-18 Fourth Edition, Dated December 14, 2015 Summary of Topics Adoption of IEC 60079-18,

3、 Explosive Atmospheres Part 18: Equipment Protection by Encapsulation “m”, (fourth edition issued December 2014) as a new IEC-based UL standard, UL 60079-18 (IEC 60079-18:2014) with US National Differences. The requirements are substantially in accordance with Proposal(s) on this subject dated Octob

4、er 9, 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 photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any

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8、 an electronic Standard on the purchasers computer system. DECEMBER 14, 2015 UL 60079-18 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 14, 2015 UL 60079-18 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURT

9、HER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL December 14, 2015 1 UL 60079-18 Standard for Explosive Atmospheres - Part 18: Equipment Protection by Encapsulation m Fourth Edition December 14, 2015 This ANSI/UL Standard for Safety consists of the Fourth Edition. The most recent designat

10、ion of ANSI/UL 60079-18 as an American National Standard (ANSI) occurred on December 14, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, Preface, or effective date information. The National Difference Page and IEC Foreword are also excluded from the

11、 ANSI approval of IEC-based standards. 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. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time.

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13、ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 60079-18-2015UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 14, 2015 UL 6007

14、9-18 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS PREFACE 4 National Differences 7 FOREWORD 8 1 Scope 11 2 Normative references .11 3 Terms and denitions 13 4 General .13 4.1 Level of protection (equipment p

15、rotection level (EPL) .13 4.2 Additional requirements for level of protection “ma” and “mb” .14 4.3 Additional requirements for level of protection “ma” 14 4.4 Rated voltage and prospective short circuit current 14 5 Requirements for compounds .14 5.1 General 14 5.2 Specication 14 5.3 Properties of

16、the compound 15 6 Temperatures .15 6.1 General 15 6.2 Determination of the limiting temperature .16 6.3 Temperature limitation .16 7 Constructional requirements .16 7.1 General 16 7.2 Determination of faults .17 7.3 Free space in the encapsulation .20 7.4 Thickness of the compound 22 7.5 Switching c

17、ontacts .26 7.6 External connections .27 7.7 Protection of bare live parts .28 7.8 Cells and batteries .28 7.9 Protective devices .32 8 Type tests 35 8.1 Tests on the compound 35 8.2 Tests on the apparatus 36 9 Routine verications and tests .41 9.1 Visual inspections .41 9.2 Dielectric strength test

18、 .41 10 Marking 42 Annex A (informative) Basic requirements for compounds for “m” equipment Annex B (informative) Allocation of test samples Bibliography DECEMBER 14, 2015 UL 60079-18 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PREFACE

19、This harmonized standard is based on IEC Publication 60079-18: 2014 edition, Explosive Atmospheres - Part 18: Equipment Protection by Encapsulation m issued 12-2014. IEC publication IEC 60079-18 is copyrighted by the IEC. This standard is considered suitable for use for conformity assessment within

20、the stated scope of the standard. This standard has been approved by the American National Standards Institute (ANSI) as an American National Standard. Application of Standard Where reference is made to a specic number of samples to be tested, the specied number is to be considered a minimum quantit

21、y. 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 adopts the IEC text with nat

22、ional differences. All national differences from the IEC text are included in the UL version of the standard. While the technical content is the same in ULs version, the format and presentation may differ. IEC Copyright For UL, the text, gures and tables of IEC publication 60079-18, Explosive Atmosp

23、heres - Part 18: Equipment Protection by Encapsulation m , copyright 2014 are used in this standard with the consent 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 rep

24、roduction of any portion of the IEC material. The IEC Foreword and Introduction are not a part of the requirements of this standard but are included for information purposes only. Copies of IEC Publication 60079-18 may be purchased from ANSI, 25 West 43rd Street, 4th Floor, New York, New York, 10036

25、, (212) 642- 4900. The following people served as members of STP 60079 and participated in the review of this standard: DECEMBER 14, 2015 UL 60079-18 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NAME COMPANY T. Schnaare, Chair Rosemount

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33、whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications i

34、s indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. Standard IEC 60079-18 has been prepared by IEC technical committee 31: Equipment for explosive atmospheres. This fourth edition cancels and replaces the third edition of IEC 60079-18 (2009), and constitutes a technical revision. DECEMBER 14, 2015 UL 60079-18 8