ANSI 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 Ma.pdf

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” STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT P

2、ERMISSION FROM ULUL 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 This

3、revision to the Adoption of IEC 60079-18, 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 is being issued to include the following: Revision fo

4、r 10 e) to include the appropriate US terms for EPLs. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin. The requirements are substantially in ac

5、cordance with Proposal(s) on this subject dated December 16, 2016. THIS FOURTH EDITION REPLACES THE THIRD EDITION. AS OF DECEMBER 14, 2020, THE THIRD EDITION OF UL 60079-18 WILL BE WITHDRAWN. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmi

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11、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 including revisions through February 20, 2017. The most recent designation of ANSI/UL 60079-18 as an Am

12、erican National Standard (ANSI) occurred on February 20, 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. Any other portions of

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15、in the sole and exclusive property of UL. COPYRIGHT 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 60079-18-2017UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 14, 2015 UL 60079-18 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTH

16、ORIZED 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 protection level (EPL) .13 4.2 Additional requirements for l

17、evel 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 the compound 15 6 Temperatures .15 6.1 General 15 6.2 Deter

18、mination 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 contacts .26 7.6 External connections .27 7.7 Protection of

19、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 .41 10 Marking 42 Annex A (informative) Basic requirements

20、 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 This harmonized standard is based on IEC Publication 60079-

21、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 the stated scope of the standard. This standard has been ap

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36、ations is 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