AS-2381.6-1993.pdf

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1、AS 2381.61993 Australian Standard Electrical equipment for explosive atmospheresSelection, installation and maintenance Part 6: Increased safety e Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 05 Aug 2009 This Australian Standard was prepared by Committee EL/14, Electrical Equipment in Hazardous Area

2、s. It was approved on behalf of the Council of Standards Australia on 10 December 1992 and published on 15 March 1993. The following interests are represented on Committee EL/14: Australian Chamber of Commerce and Industry Australian Electrical and Electronic Manufacturers Association Australian Ins

3、titute of Petroleum Department of Mineral Resources, N.S.W. Department of Resource Industries, Qld Electrical Contractors Association of Australia Electricity Supply Associations of Australia Institute of Instrumentation and Control Insurance Council of Australia The WorkCover Authority, N.S.W. Regu

4、latory authorities (electrical) Testing interests Review of Australian Standards. To keep abreast of progress in industry, Australian Standards are subject to periodic review and are kept up to date by the issue of amendments or new editions as necessary. It is important therefore that Standards use

5、rs ensure that they are in possession of the latest edition, and any amendments thereto. Full details of all Australian Standards and related publications will be found in the Standards Australia Catalogue of Publications; this information is supplemented each month by the magazine The Australian St

6、andard, which subscribing members receive, and which gives details of new publications, new editions and amendments, and of withdrawn Standards. Suggestions for improvements to Australian Standards, addressed to the head office of Standards Australia, are welcomed. Notification of any inaccuracy or

7、ambiguity found in an Australian Standard should be made without delay in order that the matter may be investigated and appropriate action taken. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 05 Aug 2009 AS 2381.61993 Australian Standard Electrical equipment for explosive atmospheresSelection, instal

8、lation and maintenance Part 6: Increased safety e First published as AS 1076.61977. Revised and redesignated AS 2318.61993. PUBLISHED BY STANDARDS AUSTRALIA (STANDARDS ASSOCIATION OF AUSTRALIA) 1 THE CRESCENT, HOMEBUSH, NSW 2140 ISBN 0 7262 8030 5 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 05 Aug

9、2009 AS 2381.619932 PREFACE This Standard was prepared by the Standards Australia Committee on Electrical Equipment in Hazardous Areas, to supersede AS 1076, Part 61977, Code of practice for the selection, installation and maintenance of electrical apparatus and associated equipment for use in explo

10、sive atmospheres, Part 6: Apparatus with type of protection e Increased safety. This is Part 6 of a 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 there

11、fore are potentially explosive. Each part details requirements appropriate to one of the types of protection techniques used to achieve electrical safety. Part 1 of this series details general requirements pertaining to all types of protection techniques and therefore must be read in conjunction wit

12、h this Part. Other Standards in this series are as follows: Part 1:General requirements Part 2:Flameproof enclosure d Part 7:Intrinsic safety i Part 10: Class II hazardous areas Other parts of this Standard, dealing with the techniques of Encapsulation m Pressurization p Sand filled q Special protec

13、tion s Non-sparking n are in the course of preparation. The requirements specified in this Standard are supplementary to and not alternative to any requirements which would apply to installations in non-hazardous areas (see AS 3000). In its terminology, definitions and general treatment of the subje

14、ct, this Part takes into account BS 5345, Selection, installation and maintenance of electrical apparatus for use in potentially explosive atmospheres (other than mining or explosive processing and manufacture), Part 6: Installation and maintenance requirements for electrical apparatus with type of

15、protection e, Increased safety. Acknowledgment is made of this assistance. Some of the more significant changes in this edition are as follows: (a) A thorough editorial re-arrangement to improve the grouping of related clauses. (b) Definitions and terminology have been revised to align with other Au

16、stralian and international Standards. (c) Requirements which relate to the installation of equipment and wiring have been substantially revised and are now presented in the mandatory form. This Standard is intended to apply to installations, or alterations or additions thereto, made or carried out a

17、fter the date of publication, but it is recommended that it should not be applied on a mandatory basis before 13 September 1993. However, if work on an installation is commenced before publication of this edition, the Authority may grant permission for the installation to be carried out in accordanc

18、e with AS 1076.61977. Application of different typefaces Three different typefaces are used in this Standard, each of these having a specific purpose, as follows: (a) Bold typeBold type opening statements which follow a Clause or Sub-clause heading and define a fundamental principle. Accessed by UNI

19、VERSITY OF SOUTH AUSTRALIA on 05 Aug 2009 3AS 2381.61993 (b) Normal type These are mandatory requirements which form the substance of a Clause in that they indicate certain methods which satisfy the essential requirements. (c) Reduced normal typeThese are explanatory notes which may give advice. The

20、y are preceded by NOTE. CopyrightSTANDARDS AUSTRALIA Users of Standards are reminded that copyright subsists in all Standards Australia publications and software. Except where the Copyright Act allows and except where provided for below no publications or software produced by Standards Australia may

21、 be reproduced, stored in a retrieval system in any form or transmitted by any means without prior permission in writing from Standards Australia. Permission may be conditional on an appropriate royalty payment. Requests for permission and information on commercial software royalties should be direc

22、ted to the head office of Standards Australia. Standards Australia will permit up to 10 percent of the technical content pages of a Standard to be copied for use exclusively in-house by purchasers of the Standard without payment of a royalty or advice to Standards Australia. Standards Australia will

23、 also permit the inclusion of its copyright material in computer software programs for no royalty payment provided such programs are used exclusively in-house by the creators of the programs. Care should be taken to ensure that material used is from the current edition of the Standard and that it is

24、 updated whenever the Standard is amended or revised. The number and date of the Standard should therefore be clearly identified. The use of material in print form or in computer software programs to be used commercially, with or without payment, or in commercial contracts is subject to the payment

25、of a royalty. This policy may be varied by Standards Australia at any time. Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 05 Aug 2009 AS 2381.61993 4 CONTENTS Page SECTION 1 SCOPE AND GENERAL 1.1SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 1.2

26、REFERENCED DOCUMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.3DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 1.4PRINCIPLE OF TECHNIQUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 SECTION 2 SELECTION 2.

27、1SCOPE OF SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 2.2AREA CLASSIFICATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 2.3GROUPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 2.4 TEMPERA

28、TURE CLASSIFICATION (LIMITING TEMPERATURE) . . . . 8 2.5ENVIRONMENTAL CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.6 ROTATING MACHINES AND SIMILAR EQUIPMENT . . . . . . . . . . . . . 9 2.7TERMINAL AND JUNCTION BOXES. . . . . . . . . . . . . . . . . . . . . . . . . . 9 SECTI

29、ON 3 INSTALLATION 3.1SCOPE OF SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 3.2INSTALLATION OF EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 3.3ELECTRICAL PROTECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 3.4 IN

30、STALLATION OF METALLIC CONDUIT SYSTEMS. . . . . . . . . . . .10 3.5 INSTALLATION OF NON-METALLIC CONDUIT SYSTEMS . . . . . . . .10 3.6INSTALLATION OF CABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 3.7CONDUCTOR TERMINATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . .

31、. .11 3.8 SELECTION AND NUMBER OF CONDUCTORS APPLIED TO EACH TERMINAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 3.9 PORTABLE EQUIPMENT AND ITS CONNECTIONS . . . . . . . . . . . . . .13 SECTION 4 INSPECTION AND TESTING, INCLUDING COMMISSIONING 4.1GENERAL

32、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.2DOCUMENTATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 4.3FORMS OF INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 4.4TESTING . . . . .

33、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 SECTION 5 MAINTENANCE 5.1GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5.2PROCEDURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

34、. . .15 5.3REPAIRS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 APPENDICES A SELECTION OF ROTATING MACHINES AND THE ASSOCIATED ELECTRICAL PROTECTION EQUIPMENT. . . . . . . . . . . . . . . . . . . . .16 B INSPECTION, TESTING AND MAINTENANCE . . . . . .

35、. . . . . . . . . . . .21 C SELECTION OF Ex e COMPONENTS. . . . . . . . . . . . . . . . . . . . . . . . .27 D INFORMATION REGARDING INSTALLATION . . . . . . . . . . . . . . . . . .31 E TYPICAL Ex e TERMINALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 F RECOMMENDED TIGHTENING T

36、ORQUE VALUES FOR TERMINAL CLAMPING SCREWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 05 Aug 2009 5AS 2381.61993 STANDARDS AUSTRALIA Australian Standard Electrical equipment for explosive atmospheres Selection, installation

37、 and maintenance Part 6: Increased safety e S E C T I O N1S C O P EA N DG E N E R A L 1.1SCOPEThis Standard sets out requirements for the selection, installation and maintenance of increased safety equipment, type of protection e. This Standardshall be readinconjunction with AS 2381.1, whichdescribe

38、s the fundamental considerations which affectthe selection, installation and maintenance requirements of all electrical equipment used in hazardous areas. NOTE: Requirements for the design and construction of increased safety electrical equipment are given in AS 2380.6. 1.2REFERENCED DOCUMENTSThe fo

39、llowing documents are referred to in this Standard: AS 1023Low voltage switchgear and controlgearProtection of electric motors 1359Rotating electrical machinesGeneral requirements 1359.30Part 30: Duty and rating 1359.41Part 41: General characteristics 1828Electrical equipment for explosive atmospher

40、esCable glands 1939Degreesofprotectionprovidedbyenclosuresforelectricalequipment (IP Code) 2052Metallic conduits and fittings 2380ElectricalequipmentforexplosiveatmospheresExplosion-protection techniques 2380.1Part 1: General requirements 2380.6Part 6: Increased safety 2381Electrical equipment for e

41、xplosive atmospheresSelection, installation and maintenance 2381.1Part 1: General requirements 2430Classification of hazardous areas 2430.1Part 1: Explosive gas atmospheres 2430.3Part 3: Specific occupancies 2768Electrical insulating materialsEvaluation and classification based on thermal endurance

42、COPYRIGHT Accessed by UNIVERSITY OF SOUTH AUSTRALIA on 05 Aug 2009 AS 2381.619936 3008Electrical installationsSelection of cables 3008.1Part 1: Cables for alternating voltages up to and including 0.6/1 kV 3903Quality systems for final inspection and test 1.3DEFINITIONSFor the purpose of this Standar

43、d, the definitions given in AS 2381.1 and those below apply. 1.3.1Increased safetytype of protection applied to electrical equipment that does not produce arcs or sparks in normal service in which additional measures are appliedsoastogiveincreasedsecurityagainstthepossibilityofexcessive temperatures

44、 and of the occurrence of arcs and sparks. NOTES: 1This type of protection is denoted by e. 2Equipment producing arcs or sparks in normal service is excluded by this definition. 1.3.2Limitingtemperaturemaximumpermissibletemperatureforelectrical equipment or a part of electrical equipment. It is the

45、lower of the two temperatures determined by the following: (a)The danger of ignition of the explosive atmosphere. (b)The thermal stability of the materials used. NOTE: This temperature may be the maximum surface temperature of components within the Ex e enclosure or the external surface temperature,

46、 whichever is greater or a lower value (see AS 2380.6). 1.3.3Initial starting current IAhighest r.m.s. value of current absorbed by an a.c. motor when at rest or by an a.c. magnet with the armature clamped in the position of maximum air gap, when supplied at rated voltage and rated frequency. NOTE:

47、Transient phenomena are ignored. 1.3.4Starting current ratio IA/INratio between initial starting current IAand rated current IN. 1.3.5Time tEtime taken for an a.c. winding, when carrying the initial starting current IA, to be heated up to the limiting temperature from the temperature reached in rate

48、d service at the maximum ambient temperature. 1.3.6Thermal current limits Ithr.m.s. value of the current required to heat up the conductor within 1 s from the temperature reached in rated service at the maximum ambient temperature to the limiting temperature. 1.3.7Dynamic current limit Idynpeak valu

49、e of that current, the dynamic effect of which the electrical equipment can sustain without damage. 1.3.8Creepage distanceshortest distance along the surface of electrical insulating material between two conductive parts. 1.3.9Clearanceshortest distance in air between two conductive parts. 1.3.10Working voltagehighest r.m.s. value of the a.c. or d.c. voltage which may occur(locally)acrossanyinsulationatratedsupplyvolts,transientsbeing disregarded, in open circuit conditions or under normal operating conditions. 1.3.11Normativeanappendixwhichisessentialto