AS NZS 2381 2-2006 Electrical equipment for explosive atmospheres - Selection installation and maintenance - Flameproof enclosure ？d？《易爆气体环境用电气设备 选择、安装与维护 防爆外壳》.pdf

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1、 AS/NZS 2381.2:2006 (Incorporating Amendment No. 1) Australian/New Zealand StandardElectrical equipment for explosive atmospheresSelection, installation and maintenance Part 2: Flameproof enclosure d AS/NZS 2381.2:2006Accessed by ISONET - CHINA STATE BUREAU OF TECHNICAL SUPERVIS on 26 Feb 2010AS/NZS

2、 2381.2:2006 This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee EL-014, Electrical Equipment in Hazardous Areas. It was approved on behalf of the Council of Standards Australia on 16 May 2006 and on behalf of the Council of Standards New Zealand on 26 May 2006. This

3、 Standard was published on 9 June 2006. The following are represented on Committee EL-014: Association of Consulting Engineers Australia Auckland Regional Chamber of Commerce Australian Chamber of Commerce and Industry Australian Coal Association Australian Electrical and Electronic Manufacturers As

4、sociation Australian Industry Group Australian Institute of Petroleum Ltd Australian Institute of Refrigeration Air Conditioning and Heating (Inc) Australian Petroleum Production and Exploration Association Certification Interests (Australia) Committee EL-023 Department of Natural Resources and Mine

5、s (Qld) Department of Primary Industries, Mine Safety (NSW) Electrical Regulatory Authorities Council Energy Networks Association Engineers Australia Institute of Electrical Inspectors Institute of Instrumentation, Control and Automation Australia Mining Electrical and Mining Mechanical Engineering

6、Society Ministry of Economic Development (New Zealand) National Electrical and Communications Association New Zealand Association of Marine, Aviation and Power Engineers New Zealand Employers and Manufacturers Association New Zealand Hazardous Areas Electrical Coordinating Committee WorkCover New So

7、uth Wales Keeping Standards up-to-date Standards are living documents which reflect progress in science, technology and systems. To maintain their currency, all Standards are periodically reviewed, and new editions are published. Between editions, amendments may be issued. Standards may also be with

8、drawn. It is important that readers assure themselves they are using a current Standard, which should include any amendments which may have been published since the Standard was purchased. Detailed information about joint Australian/New Zealand Standards can be found by visiting the Standards Web Sh

9、op at .au or Standards New Zealand web site at www.standards.co.nz and looking up the relevant Standard in the on-line catalogue. Alternatively, both organizations publish an annual printed Catalogue with full details of all current Standards. For more frequent listings or notification of revisions,

10、 amendments and withdrawals, Standards Australia and Standards New Zealand offer a number of update options. For information about these services, users should contact their respective national Standards organization. We also welcome suggestions for improvement in our Standards, and especially encou

11、rage readers to notify us immediately of any apparent inaccuracies or ambiguities. Please address your comments to the Chief Executive of either Standards Australia or Standards New Zealand at the address shown on the back cover. This Standard was issued in draft form for comment as DR 06099. Access

12、ed by ISONET - CHINA STATE BUREAU OF TECHNICAL SUPERVIS on 26 Feb 2010AS/NZS 2381.2:2006 (Incorporating Amendment No. 1) Australian/New Zealand StandardElectrical equipment for explosive atmospheresSelection, installation and maintenance Part 2: Flameproof enclosure d COPYRIGHT Standards Australia/S

13、tandards New Zealand All rights are reserved. No part of this work may be reproduced or copied in any form or byany means, electronic or mechanical, including photocopying, without the writtenpermission of the publisher. Jointly published by Standards Australia, GPO Box 476, Sydney, NSW 2001 and Sta

14、ndardsNew Zealand, Private Bag 2439, Wellington 6020 ISBN 0 7337 7486 5 First published as AS 1076.31977. Revised and redesignated AS 2381.21993. Final edition 2006. Reissued incorporating Amendment No.1 (September 2006). AS/NZS 2381.2:2006Accessed by ISONET - CHINA STATE BUREAU OF TECHNICAL SUPERVI

15、S on 26 Feb 2010AS/NZS 2381.2:2006 2 PREFACE This Standard was prepared by the Standards Australia Committee on Electrical Equipment in Hazardous Areas, to supersede AS 2381.21993, Electrical equipment for explosive atmospheres - Selection, installation and maintenance - Flameproof enclosure d. This

16、 is Part 2 of the AS/NZS 2381 series of Standards covering the selection, installation and maintenance of electrical equipment for use in areas where flammable materials are generated, processed, handled or stored, and which therefore are potentially explosive. This Standard incorporates Amendment N

17、o. 1 (September 2006). The changes required by the Amendment are indicated in the text by a marginal bar and amendment number against the clause, note, table, figure or part thereof affected. Each Part details requirements appropriate to one of the types of protection techniques used to achieve elec

18、trical safety. Part 1 of this series details general requirements pertaining to all types of protection techniques and therefore must be read in conjunction with this Part. Other Standards in this series are as follows: Part 1: General requirements Part 6: Increased safety e Part 7: Intrinsic safety

19、 i This edition of the Standard should be considered a transitional edition pending future publication of AS/NZS 60079.14. AS/NZS 60079.14 will be based on IEC 60079-14 and is intended to supersede all Parts of the AS/NZS 2381 series. Changes in this edition have been constrained to essential items

20、as an interim step, pending these future changes. The requirements specified in this Standard are supplementary but not alternative to any requirements which would apply to installations in non-hazardous areas (see AS/NZS 3000). The significant changes in this edition include (a) update of reference

21、s to new Standards and in particular to the AS/NZS 60079 series; and (b) alignment of cable gland requirements and other items to IEC Standards. This Standard is intended to apply to installations, or alterations or additions thereto, made or carried out after the date of publication. The terms norm

22、ative and informative are used to define the application of the appendix to which they apply. A normative appendix is an integral part of a standard, whereas an informative appendix is only for information and guidance. Accessed by ISONET - CHINA STATE BUREAU OF TECHNICAL SUPERVIS on 26 Feb 20103 AS

23、/NZS 2381.2:2006 CONTENTS Page 1.1 SCOPE 4 1.2 REFERENCED DOCUMENTS 4 1.3 DEFINITIONS 5 1.4 PRINCIPLE OF TECHNIQUE 5 2 SELECTION 2.1 SCOPE OF SECTION . 6 2.2 AREA CLASSIFICATION . 6 2.3 EQUIPMENT GROUPING . 6 2.4 TEMPERATURE CLASSIFICATION 7 2.5 ENVIRONMENTAL CONDITIONS 7 2.6 FAULT CONDITIONS . 7 3

24、INSTALLATION 3.1 SCOPE OF SECTION . 8 3.2 CLEARANCE FROM OBJECTS 8 3.3 PROTECTION FROM THE ENVIRONMENT. 8 3.4 CONDUIT SYSTEMS. 9 3.5 CABLE SYSTEMS . 9 3.6 CABLE ENTRY 10 3.7 UNUSED ENTRIES 11 4 INSPECTION AND TESTING, INCLUDING COMMISSIONING 4.1 GENERAL 11 4.2 DOCUMENTATION. 12 4.3 FORMS OF INSPECTI

25、ON 12 4.4 TESTING 12 5 MAINTENANCE 5.1 GENERAL 12 5.2 PROCEDURES . 12 5.3 REPAIRS. 12 APPENDICES A INSPECTION, TESTING AND MAINTENANCE. 13 B INFORMATION REGARDING INSTALLATION 21 Accessed by ISONET - CHINA STATE BUREAU OF TECHNICAL SUPERVIS on 26 Feb 2010AS/NZS 2381.2:2006 4 COPYRIGHT STANDARDS AUST

26、RALIA/STANDARDS NEW ZEALAND Australian/New Zealand Standard Electrical equipment for explosive atmospheresSelection, installation and maintenance Part 2: Flameproof enclosure d 1.1 SCOPE This Standard sets out requirements for the selection, installation and maintenance of flameproof enclosures, typ

27、e of protection d. This Standard shall be read in conjunction with AS/NZS 2381.1, which describes the fundamental considerations which affect the selection, installation and maintenance requirements of all electrical equipment used in hazardous areas. NOTES: 1 Requirements for the design and constru

28、ction of flameproof electrical equipment are given in AS/NZS 60079.1. 2 While this Standard may be applied to coal mining installations additional requirements may be contained in State mining regulations. 1.2 REFERENCED DOCUMENTS The following documents are referred to in this Standard: AS 1828 Ele

29、ctrical equipment for explosive atmospheresCable glands (superseded by AS/NZS 60079.1) 2052 Metallic conduits and fittings 2380 Electrical equipment for explosive atmospheresExplosion-protection techniques 2380.2 Part 2: Flameproof enclosures d (superseded by AS/NZS 60079.1) 60529 Degrees of protect

30、ion provided by enclosures (IP Code) AS/NZS 2381 Electrical equipment for explosive atmospheresSelection, installation and maintenance 2381.1 Part 1: General requirements 2430 Classification of hazardous areas 2430.3 Part 3: Examples of area classification 2480 Electrical equipment for explosive atm

31、ospheresFlameproof enclosureType of protection d 3000 Electrical installations (known as the Australian/New Zealand Wiring Rules) 3760 In-service safety inspection and testing of electrical equipment 3800 Electrical equipment for explosive atmospheresRepair and overhaul Accessed by ISONET - CHINA ST

32、ATE BUREAU OF TECHNICAL SUPERVIS on 26 Feb 20105 AS/NZS 2381.2:2006 COPYRIGHT AS/NZS 60079 Electrical apparatus for explosive gas atmospheres 60079.1 Part 1: Flameproof enclosures d 60079.4 Part 4: Method of test for ignition temperature 60079.10 Part 10: Classification of hazardous areas 60079.20 P

33、art 20: Data for flammable gases and vapours, relating to the use of electrical apparatus 1.3 DEFINITIONS For the purpose of this Standard, the definitions given in AS/NZS 2381.1 and those below apply. 1.3.1 Flameproof enclosure Type of protection of electrical equipment in which the enclosure will

34、withstand an internal explosion of a flammable mixture which has penetrated into the interior without suffering damage or causing ignition, through any joints or structural openings in the enclosure, of an external explosive atmosphere consisting of one or more of the gases or vapours for which it i

35、s designed. NOTE: This type of protection is indicated by the letter d. 1.3.2 Flameproof joint Place where corresponding surfaces of the different parts of a flameproof enclosure (or the conjunction of enclosures) come together, and where flame or the products of combustion may be transmitted from i

36、nside to the outside of the enclosure. 1.3.3 Gap Distance between the corresponding surfaces of a flameproof joint when the electrical equipment has been assembled. For cylindrical surfaces, the gap is the difference between diameters (diametral clearance) of the bore and the cylindrical component.

37、1.3.4 Flamepath The shortest path through a joint from the inside to the outside of a flameproof enclosure. 1.3.5 Normative An Appendix which is essential to the understanding or implementation of the Standard. 1.4 PRINCIPLE OF TECHNIQUE 1.4.1 General Electrical equipment which is approved in accord

38、ance with the requirement of type of protection d is so designed and constructed that it is not capable, under practical conditions of operation within the rating of the apparatus, of igniting a surrounding explosive atmosphere. This is achieved by (a) completely surrounding the electrical apparatus

39、 with an enclosure, including where necessary, pressure-relieving gaps of sufficient strength and integrity of manufacture to withstand internal explosions without suffering damage and without communicating internal combustion or flame to the external flammable gas or vapour for which it is designed

40、 through any joints or structural openings in the enclosure; and (b) restricting the maximum outer surface temperature to below the ignition temperature of the gas or vapour which presents the explosion risk. Accessed by ISONET - CHINA STATE BUREAU OF TECHNICAL SUPERVIS on 26 Feb 2010AS/NZS 2381.2:2

41、006 6 COPYRIGHT 1.4.2 Enclosures Flameproof enclosures are designed and generally certified, to house a set number of predetermined types of electrical equipment. When empty, flameproof enclosures are available with component certification, (indicated by a U in the certificate number), so it is nece

42、ssary to obtain a full certificate after any equipment is housed within them. Alternatively, certificates for empty flameproof enclosures may have conditions of use that are used to control the contents of the enclosures. Alterations to the disposition of the internal components of an already certif

43、ied piece of equipment is not permitted as conditions may be inadvertently created which will lead to pressure piling. Pressure piling is a condition resulting from the ignition of precompressed gases in compartments or subdivisions other than those in which ignition was initiated, which may lead to

44、 a higher maximum pressure than would otherwise be expected. Furthermore, extra components such as relays, or contactors, shall not be added unless it is permitted by the certification documentation or the manufacturer as the addition may alter the maximum surface temperature of the equipment and po

45、ssibly the temperature classification. Similarly additional cable entries, or any other holes, shall not be made in an enclosure unless it is permitted on the certification documentation. NOTE: Additional holes or modification to cable entries is not permitted by the installer. 2 SELECTION 2.1 SCOPE

46、 OF SECTION The general factors affecting the selection of electrical equipment for hazardous areas are described in detail in AS/NZS 2381.1. The specific factors which need to be taken into account when selecting equipment with type of protection d are described in this following Section. 2.2 AREA

47、CLASSIFICATION Equipment with type of protection d may be used in Zone 1 or 2 areas. 2.3 EQUIPMENT GROUPING 2.3.1 General Equipment with type of protection d is subject to equipment grouping (see AS/NZS 2381.1) and therefore the equipment may be used only with gases and vapours allocated to the appr

48、opriate group and subgroup. Group II equipment of a particular subgroup may also be used with gases or vapours allocated to a lower subgroup, e.g. equipment for Group IIC may also be used for Groups IIB and IIA. Equipment marked for a specific gas, or marked for an apparatus group plus a specific ga

49、s, and used in that specific gas atmosphere shall be installed in accordance with the requirements for the apparatus group to which the specific gas belongs. For example, equipment marked IIB + H2 and used in a hydrogen atmosphere shall be installed as IIC apparatus. NOTE: It will sometimes be found necessary to use electrical equipment in applications where compounds may be present which have not yet been allocated to a subgroup. In these circumstances, expert advice should be obtained on the subgroupin