BS-EN-50018-2000.pdf

BRITISH STANDARD BS EN 50018:2000 Incorporating Amendment No. 1 and Corrigendum No. 1 Electrical apparatus for potentially explosive atmospheres Flameproof enclosure d The European Standard EN 50018:2000, with the incorporation of amendment A1:2002, has the status of a British Standard ICS 29.260.20 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:42:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 50018:2000 This British Standard was published under the under the authority of the Standards Policy and Strategy Committee on 15 December 2000 © BSI 20 January 2006 ISBN 0 580 36809 2 National foreword This British Standard is the official English language version of EN 50018:2000, including amendment A1:2002. It supersedes BS EN 50018:1995, BS 5501-5:1977 and BS 5000-17:1981, which are withdrawn. The start and finish of text introduced or altered by amendment is indicated in the text by tags !“. Tags indicating changes to CENELEC text carry the number of the CENELEC amendment. For example, text altered by CENELEC amendment A1 is indicated by !“. The UK participation in its preparation was entrusted by Technical Committee GEL/31, Electrical apparatus for use in explosive atmospheres, to Subcommittee GEL/31/12, Flameproof enclosures d, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its 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, the EN title page, pages 2 to 55 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments 1421114 March 2003See national foreword 15900 Corrigendum No. 1 20 January 2006 Revision of supersession details Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:42:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 50018 November 2000 NORME EUROPÉENNE + A1 EUROPÄISCHE NORM October 2002 CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels © 2000 CENELEC -All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50018:2000 + A1:2002 E ICS 29.260.20Supersedes EN 50018:1994 English version Electrical apparatus for potentially explosive atmospheres - Flameproof enclosure 'd' (includes amendment A1:2002) Matériel électrique pour atmosphères explosibles - Enveloppe antidéflagrante 'd' (inclut l'amendement A1:2002) Elektrische Betriebsmittel für explosiongefährdete Bereiche - Druckfeste Kapselung 'd' (enthält Änderung A1:2002) This European Standard was approved by CENELEC on 2000-04-01. Amendment A1 was approved by CENELEC on 2001-06-01. 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 national 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 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:42:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 50018:2000 Foreword This European Standard was prepared by SC 31-2, Flameproof enclosures 'd', of Technical Committee CENELEC TC 31, Electrical apparatus for explosive atmospheres. It consists of the text of EN 50018:1994 and three amendments (prAA, prAB and prAC) which were submitted to the Unique Acceptance Procedure and approved by CENELEC on 2000-04-01 for publication as a new edition of the standard. This European Standard supersedes EN 50018:1994. This European standard was prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and covers essential requirements of the EC Directive 94/9/EC. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop)2001-04-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow)2003-06-30 This European Standard is to be read in conjunction with EN 50014:1997 - Electrical apparatus for potentially explosive atmospheres - General requirements, and with the European Standards for the specific types of protection listed in the scope of EN 50014:1997. This European Standard should not be considered with any other editions of these standards and their amendments. Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given only for information. In this standard, annexes A, B, C, D and E are normative. Foreword to amendment A1 This amendment to the European Standard EN 50018:2000 was prepared by SC 31-2, Flameproof enclosures 'd', of Technical Committee CENELEC TC 31, Electrical apparatus for explosive atmospheres. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as amendment A1 to EN 50018 on 2001-06-01. The following dates were fixed: latest date by which the amendment has to be implemented at national level by publication of an identical national standard or by endorsement (dop)2003-03-01 latest date by which the national standards conflicting with the amendment to be withdrawn (dow)2003-06-30 © BSI 20 January 2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:42:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 50018:2000 Contents GENERAL.4 1 Scope4 2 Normative references.4 3 Definitions5 4 Apparatus grouping and temperature classification7 SPECIFIC CONSTRUCTIONAL REQUIREMENTS7 5 Flameproof joints.7 6 Cemented joints. 16 7 Operating rods . 16 8 Supplementary requirements for shafts and bearings. 16 9 Light-transmitting parts. 19 10 Breathing and draining devices which form part of a flameproof enclosure . 19 11 Fasteners, associated holes and closing devices 20 12 Materials and mechanical strength of enclosures; materials inside the enclosures . 23 13 Entries for flameproof enclosures 23 VERIFICATIONS AND TESTS. 25 14 General . 25 15 Type tests. 25 16 Routine tests 33 OTHER REQUIREMENTS. 34 17 Switchgear 34 18 Lampholders and lampcaps 35 19 Non-metallic enclosures and non-metallic parts of enclosures 36 20 Pressure transducers using capillaries 38 ANNEX A (normative) Additional requirements for crimped ribbon elements of breathing and draining devices 39 ANNEX B (normative) Additional requirements for elements, with non-measurable paths, of breathing and draining devices . 40 ANNEX C (normative) Additional requirements for flameproof cable entries 42 ANNEX D (normative) Additional requirements for Group I, IIA and IIB for empty flameproof enclosures to be certified as Ex components and the utilization of such Ex Component certificates to obtain certificates 47 ANNEX E (normative) Cells and batteries used in flameproof 'd' enclosures . 49 Bibliography . 55 © BSI 20 January 2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:42:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 50018:2000 GENERAL 1 Scope 1.1This 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. 1.2This European Standard supplements the European Standard EN 50014, the requirements of which apply to electrical apparatus with flameproof enclosure. 1.3This European Standard covers only Category M2 and 2. 1.4Due to the safety factors incorporated in the type of protection d the uncertainty of measurement inherent in good quality, regularly calibrated measurement equipment is considered to have no significant detrimental effect and need not to be taken into account when making any measurements necessary to verify the compliance of the enclosure with the requirements of this standard. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 500141997Electrical apparatus for potentially explosive atmospheres General requirements. EN 50019 2000 Electrical apparatus for potentially explosive atmospheres Increased safety e. EN 50020 1994 Electrical apparatus for potentially explosive atmospheres Intrinsic safety i. EN 50039 1980 Electrical apparatus for potentially explosive atmospheres Intrinsically safe electrical systems i. EN 60061Series Lamp caps and holders together with gauges for the control of interchangeability and safety. EN 60061-11993Part 1: Lamp caps. (IEC 60061-1:1969 + supplements A:1970 to N:1992, modified) EN 60061-21993Part 2: Lampholders. (IEC 60061-1:1969 + supplements A:1970 to K:1992, modified) ? EN 60086-12001Primary batteries Part 1: General (IEC 60086-1:2000) EN 60127Series Miniature fuses (IEC 60127) EN 602851994 Alkaline secondary cells and batteries Sealed nickel-cadmium clyindrical rechargeable single cells (IEC 60285:1993 + corr. August 1993)? EN 60529 1991Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989). © BSI 20 January 2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:42:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 50018:2000 ? EN 606231995 Vented nickel-cadmium prismatic rechargeable single cells (IEC 60623:1990 + A1:1992 + A2:1992) EN 606621993High pressure sodium vapour lamps (IEC 60662:1980 + A2:1987 + A3:1990)? EN 60695-11-101999Fire hazard testing Part 11-10: Test flames 50 W horizontal and vertical flame test methods (IEC 60695-11-10:1999). ? EN 611501993Alkaline secondary cells and batteries Sealed nickel-cadmium rechargeable monobloc batteries in button cell design (IEC 61150:1992) ? HD 214 S21980Recommended method for determining the comparative tracking index of solid insulating materials under moist conditions (IEC 60112:1979). IEC 60079-1A1975Electrical apparatus for explosive gas atmospheres Part 1: Construction and test of flameproof enclosures of electrical apparatus First supplement: Appendix D: Method of test for ascertainment of maximum experimental safe gap. ISO 31-0 1992Quantities and units Part 0: General principles. ISO 185 1988Grey cast iron Classification. ISO 468 1982Surface roughness Parameters, their values and general rules for specifying requirements. ISO 965-11998ISO general purpose metric screw threads; Tolerances; Part 1: Principles and basic data. ISO 965-3 1998ISO general purpose metric screw threads; Tolerances; Part 3: Deviations for constructional threads. ISO 1210 1982Plastics Determination of flammability characteristics of plastics in the form of small specimens in contact with a small flame. ISO 27381999Permeable sintered metal materials; Determination of density, oil content, and open porosity. ISO 4003 1977Permeable sintered metal materials; Determination of bubble test pore size. ISO 4022 1987Permeable sintered metal materials; Determination of fluid permeability. ISO 6892 1984Metallic materials - Tensile testing at ambient temperature. 3 Definitions The following definitions specific to type of protection flameproof enclosure d are applicable in this European Standard; they supplement the definitions which are given in EN 50014. 3.1 flameproof enclosure d 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 prevents the transmission of the explosion to the explosive atmosphere surrounding the enclosure © BSI 20 January 2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:42:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 6 EN 50018:2000 3.2 volume 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 NOTE For luminaires, the volume is determined without lamps fitted. 3.3 flameproof joint place where corresponding surfaces of two parts of an enclosure come 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) shortest path through a flameproof joint from the inside to the outside of an enclosure 3.5 distance (l) 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) distance between the corresponding surfaces of a flameproof joint when the electrical 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) maximum