BS EN 50018 1995 Electrical apparatus for potentially explosive atmospheres Flameproof enclosures “d”.pdf

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1、BRITISH STANDARD BS EN 50018:1995 Electrical apparatus for potentially explosive atmospheres Flameproof enclosures “d” The European Standard EN 50018:1994 has the status of a British Standard UDC 621.31-213.34-213.6-78.614.833.4 .5:001.4:620.1:62-777 Licensed Copy: Institute Of Technology Tallaght,

2、Institute of Technology, Tue Mar 27 23:23:43 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBSEN 50018:1995 This British Standard, having been prepared under the directionof the ElectrotechnicalStandards PolicyCommittee, was publishedunder the authority ofthe Standards Boardand comesinto effect on 15 Jan

3、uary 1995 BSI 12-1998 The following BSI references relate to the work on this standard Committee reference GEL/114 Draft for comment 91/22962 DC ISBN 0 580 22775 8 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European S

4、tandard was prepared, comprises the national committees of the following countries: Austria Italy Belgium Luxembourg Denmark Netherlands Finland Norway France Portugal Germany Spain Greece Sweden Iceland Switzerland Ireland United Kingdom Amendments issued since publication Amd. No. Date Comments Li

5、censed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue Mar 27 23:23:43 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBSEN 50018:1995 BSI 12-1998 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 Text of EN 50018 5 National annex NA (informa

6、tive) Committees responsible 35 National annex NB (informative) Cross-references Inside back cover Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue Mar 27 23:23:43 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBSEN 50018:1995 ii BSI 12-1998 National foreword This British Sta

7、ndard has been prepared under the direction of the General Electrotechnical Standards Policy Committee and is the English language version of EN 50018 Electrical apparatus for potentially explosive atmospheresFlameproof enclosures “d”, published by the European Committee for Electrotechnical Standar

8、dization (CENELEC). This standard should be read in conjunction with BS EN 50014:1993 Electrical apparatus for potentially explosive atmosphere General requirements, which it supplements. Product certification. Users of this British Standard are advised to consider the desirability of third party ce

9、rtification of product conformity with this British Standard based on testing and continuing product surveillance, which may be coupled with assessment of a suppliers quality systems against the appropriate Part of BS 5750. Enquiries as to the availability of third party certification schemes are fo

10、rwarded by BSI to the Association of Certification Bodies. If a third party certification scheme does not already exist, users should consider approaching an appropriate body from the list of association members. A British Standard does not purport to include all the necessary provisions of a contra

11、ct. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 36,

12、an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover. Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue Mar 27 23:23:43 G

13、MT+00:00 2007, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50018 August 1994 UDC 621.31-213.34-213.6-78.614.833.4/.5:001.4:620.1:62-777 Supersedes EN 50018:1977 and its amendments Tobe read in conjuction with EN50014:1992 Descriptors: Electrical apparatus, potentia

14、lly explosive atmosphere, explosive atmosphere, explosion proofing, specific requirement, flameproof enclosure “d” English version Electrical apparatus for potentially explosive atmospheres Flameproof enclosures “d” Matriel lectrique pour atmosphres explosibles Enveloppe antidflagrante “d” Elektrisc

15、he Betriebsmittel fr explosionsgefhrdete Bereiche Druckfeste Kapselung “d” This European Standard was approved by CENELEC on 8 March 1994. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a na

16、tional standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version

17、 in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, Fran

18、ce, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Cen

19、tral Secretariat: rue de Stassart 35, B-1050 Brussels 1994 Copyright reserved to CENELEC members Ref. No. EN 50018:1994 E Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue Mar 27 23:23:43 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN50018:1994 BSI 12-1998 2 Foreword This E

20、uropean Standard was prepared by CENELEC Subcommittee SC 31-2 Flameproof enclosures “d”. It was submitted to the CENELEC memebers for formal vote in July 1993 and was approved by CENELEC as EN 50018 on 1994-03-08. This EN supersedes EN 50018:1977 and its amendments A1:1979, A2:1982 and A3:1985. The

21、following dates were fixed: This European Standard is to be read in conjunction with EN50014:1992, Electrical apparatus for potentially explosive atmospheres General requirements, and with the second editions of the European Standards for the specific types of protection used in the scope of EN 5001

22、4:1992. This European Standard should not be considered in conjunction with any of the first edition standards listed in EN 50014:1977. Contents Page Foreword 2 1 Scope 5 2 Publications 5 3 Definitions 5 4 Apparatus grouping and temperatureclassification 6 5 Flameproof joints 6 6 Cemented joints 13

23、7 Operating rods 13 8 Supplementary requirements for shafts and bearings 13 9 Light-transmitting parts 15 10 Breathing and draining devices which form part of a flameproof enclosures 15 11 Fasteners, associated holes and closing devices 16 12 Materials and mechanical strength of enclosures; material

24、s inside the enclosures 19 13 Entries for flameproof enclosures 19 14 General 21 15 Type tests 21 16 Routine tests 26 17 Switchgear 27 18 Lampholders and lampcaps 28 19 Non-metallic enclosures and non-metallic parts of enclosures 28 20 Pressure transducers using capillaries 30 Annex A (normative) Ad

25、ditional requirementsforcrimped ribbon elements ofbreathing and draining devices 31 Annex B (normative) Additional requirementsforelements, with non-measurable paths, of breathing and draining devices 31 Annex C (normative) Additional requirements for flameproof cable entries 32 Figure 1 Example of

26、construction for indirectchecking of a flanged Group I flameproof joint 7 Figures 2 and 3 Spigot joints 7 Figures 4, 5, 6 Holes in surfaces of flanged joints 8 Figures 7, 8, 9 Holes in surfaces of spigot joints 9 latest date of publication of an identical national standard (dop) 1994-12-01 latest da

27、te of withdrawal of conflicting national standards(dow) Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue Mar 27 23:23:43 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN50018:1994 BSI 12-1998 3 Page Figure 10 Example for a joint with partial cylindrical surfaces 12 Figures 1

28、1 to 17 Illustration of the requirements concerning gaskets 14 Figure 18 Example of cylindrical joint for shaft of rotating electrical machine 14 Figure 19 Example of labyrinth joint for shaft of rotating electrical machine 14 Figure 20 Example of joint with floating glandforshaft of rotating electr

29、ical machine 14 Figure 21 Joints of shaft glands of rotatingelectrical machines 15 Figure 22 Examples of closing devices for unused apertures 18 Figure 23 Sealing test for stopping boxes with setting compound 25 Figure 24 Device for the sealing tests for cable entries 33 Table 1 Minimum width of joi

30、nt and maximumgap for enclosures of Group I, IIA and IIB 10 Table 2 Minimum width of joint and maximumgap of Group IIC enclosures 11 Table 3 Cylindrical threaded joints 12 Table 4 Taper threaded joints 12 Table 5 Conditions for the determination ofmaximum surface temperature 21 Table 6 Reduction in

31、length of a threaded joint for non-transmission test 24 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue Mar 27 23:23:43 GMT+00:00 2007, Uncontrolled Copy, (c) BSI4 blank Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue Mar 27 23:23:43 GMT+00

32、:00 2007, Uncontrolled Copy, (c) BSIEN 50018:1994 BSI 12-1998 5 1 Scope 1.1 This European Standard contains the specific requirements for the construction and testing of electrical apparatus with type of protection flameproof enclosure “d”, intended for use in potentially explosive atmospheres. 1.2

33、This European Standard supplements European Standard EN 50014, the requirements of which apply to electrical apparatus with flameproof enclosure. 2 Publications 2.1 IEC publications referred to in European Standard EN 50018 IEC 61,Lamp caps and holders together with gauges for the control of interch

34、angeability and safety IEC 61-1 supplement K (1983) Part 1: Lamp caps HD65.1 S1 (1978) IEC 61-2 supplement G (1983) Part 2: Lampholders. HD65.2 S1 (1978) IEC 79-1A (1975)Electrical apparatus for explosive gas atmospheres Part 1: Construction and test of flameproof enclosures of electrical apparatus.

35、 First supplement: Appendix D: Method of test for ascertainment of maximum experimental safe gap IEC 82 (1984), Ballasts for tubular fluorescent lamps IEC 112 (1979)Recommended method for determining the comparative tracking index of solid insulating materials under moist conditions. HD214 S2 (1980)

36、 IEC 529 (1989)Degrees of protection provided by enclosures (IP Code). EN 60529 (1991) IEC 707 (1981)Methods of test for the determination of the flammability of solid electrical insulating materials when exposed to an igniting source. HD 441 S1 (1983) 2.2 ISO standards referred to in European Stand

37、ard EN 50018 ISO 31-0 (1992)Quantities, units and symbols; Part0: General principles ISO 185 (1988)Grey cast iron; classification ISO 468 (1982)Surface roughness; Parameters, their values and general rules for specifying requirements ISO 965-1 (1980)ISO general purpose metric screw threads; Toleranc

38、es; Part 1: Principles and basic data ISO 965-3 (1980)ISO general purpose metric screw threads; Tolerances; Part 3: Deviations for constructional threads ISO 1210 (1992)Plastics; Determination of burning behaviour of horizontal and vertical specimens in contact with a small-flame ignition source ISO

39、 2738 (1987)Permeable sintered metal materials; Determination of density, oil content, and open porosity ISO 4003 (1977)Permeable sintered metal materials; Determination of bubble test pore size ISO 4022 (1987)Permeable sintered metal materials; Determination of fluid permeability ISO 6892 (1984)Met

40、allic materials; Tensile testing. EN 10002-1 (1990) and EN10002-1 AC1 (1990). 2.3 European Standards referred to in European Standard EN 50018 EN 50014 (1992), Electrical apparatus for potentially explosive atmospheres General requirements. EN 50019 (1994), Electrical apparatus for potentially explo

41、sive atmospheres. Increased safety“e”. EN 50020 (1994), Electrical apparatus for potentially explosive atmospheres. Intrinsic safety“i”. 3 Definitions The following definitions specific to type of protection flameproof enclosure “d” are applicable in this European Standard; they supplement the defin

42、itions which are given in European Standard EN 50014. 3.1 flameproof enclosure “d” a type of protection in which the parts which can ignite an explosive atmosphere are placed in an enclosure which can withstand the pressure developed during an internal explosion of an explosive mixture and which pre

43、vents the transmission of the explosion to the explosive atmosphere surrounding the enclosure 3.2 volume the total internal volume of the enclosure. However, for enclosures in which the contents are essential in service, the volume to be considered is the remaining free volume NOTEFor luminaires, th

44、e volume is determined without lamps fitted. Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue Mar 27 23:23:43 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN50018:1994 6 BSI 12-1998 3.3 flameproof joint the place where corresponding surfaces of two parts of an enclosure com

45、e together, or the conjunction of enclosures, and prevent the transmission of an internal explosion to the explosive atmosphere surrounding the enclosure 3.4 width of flameproof joint (L) the shortest path through a flameproof joint from the inside to the outside of an enclosure 3.5 distance (l) the

46、 shortest path through a flameproof joint, when the width of the joint L is interrupted by holes intended for the passage of fasteners for assembling the parts of the flameproof enclosure 3.6 gap of flameproof joint (i) the distance between the corresponding surfaces of a flameproof joint when the e

47、lectrical apparatus enclosure has been assembled. For cylindrical surfaces, forming cylindrical joints, the gap is the difference between the diameters of the bore and the cylindrical component 3.7 maximum experimental safe gap (MESG) (for an explosive mixture) the maximum gap of a joint of 25 mm wi

48、dth which prevents any transmission of an explosion in 10 tests made under the conditions specified in IEC79-1A 3.8 shaft a part of circular cross section used for the transmission of rotary movement 3.9 operating rod a part used for the transmission of control movements which may be rotary or linea

49、r or a combination of the two 3.10 pressure-piling the results of an ignition, in a compartment or subdivision of an enclosure, of a gas mixture pre-compressed for example due to a primary ignition in another compartment or subdivision 3.11 quick-acting door or cover a door or cover provided with a device which permits opening or closing by a simple operation, such as the movement of a lever or the rotation of a wheel. The device is arranged so that the operation has two stages: one for lo