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1、BRITISH STANDARD BS EN 50021:1999 Incorporating Corrigenda Nos. 1 and 2 Electrical apparatus for potentially explosive atmospheres Type of protection “n” The European Standard EN 50021:1999 has the status of a British Standard ICS 29.260.20 ? BS EN 50021:1999 This British Standard, having been prepa
2、red under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 July 1999 BSI 17 March 2006 ISBN 0 580 32195 9 National foreword This British Standard is the English language version of EN50021:1999. It supers
3、edes BS 6941:1988 and BS 5000-16:1997 which are withdrawn. The UK participation in its preparation was entrusted by Technical Committee GEL/31, Electrical apparatus for explosive atmospheres, to Subcommittee GEL/31/14, Types of protection “e” and “n”, which has the responsibility to: A list of organ
4、izations represented on this committee 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 Corresp
5、ondence 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
6、 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 59 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. aid enquirers to understa
7、nd 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. Amendments issued since publication Amd. No.Da
8、teComments 10697 Corrigendum No. 1 September 1999Indicated by a sideline 15898 Corrigendum No. 2 March 2006Revision of supersession details. CENELEC European Committee for Electrotechnical Standardization Comite Europe en de Normalisation Electrotechnique Europa isches Komitee fu r Elektrotechnische
9、 Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1999 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members Ref. No. EN 50021:1999 E EUROPEAN STANDARDEN 50021 NORME EUROPE ENNE EUROPA ISCHE NORM April 1999 ICS 29.100.01 Descriptors: E
10、nglish version Electrical apparatus for potentially explosive atmospheres Type of protectionn Mate riel e lectrique pour atmosphe res explosibles Mode de protection type n Elektrische Betriebsmittel fu r explosionsgefa hrdete Bereiche Zu ndschutzart n This European Standard was approved by CENELEC o
11、n 1998-08-01. 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 ma
12、y 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
13、 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
14、and United Kingdom. Page 2 EN 50021:1999 Foreword This European Standard was prepared by SC 31-5, Apparatus type of protection n, of Technical Committee CENELEC TC 31, Electrical apparatus for explosive atmospheres. The text of this draft was submitted to the formal vote and was approved by CENELEC
15、as EN 50021 on 1998-08-01. 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) 1999-11-01 latest date by which the national standards conflicting with the EN have to be withdrawn(d
16、ow) 2003-06-30 The 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. Annexes designated normative are part of the body of the standard. In this standard, an
17、nex A is normative. Contents Page Foreword2 Section One: General3 1Scope3 2Normative references3 3Definitions4 4General requirements7 Section Two: Requirements for all electrical apparatus11 5General11 6Construction11 7Connection facilities and wiring12 8Clearances, creepage distances and separation
18、s14 9Electric strength16 Section Three: Supplementary requirements for non-sparking apparatus21 10Rotating machines21 11Fuses and fuse assemblies23 12Luminaires24 13Instruments and low-power apparatus27 14Current transformers27 15Plugs and sockets28 16Cells and batteries28 Section Four: Supplementar
19、y requirements for apparatus producing arcs, sparks or hot surfaces32 17General32 18Enclosed-break devices and non-incendive components32 19Hermetically sealed device32 20Sealed device or encapsulated device32 21Energy-limited apparatus and circuits33 22Restricted-breathing enclosures34 23Simplified
20、 pressurization34 Section Five: Verification and testing34 24General34 25Documents34 26Type tests34 27Routine verifications and tests45 Section Six: Marking and documentation45 28Marking45 29Documentation47 30Manufacturers responsibility47 Annex A (normative) Assessment of energy-limited apparatus a
21、nd circuits by reference curves and tables48 BSI 17 March 2006 Page 3 EN 50021:1999 Section One: General 1 Scope This European Standard specifies requirements for the construction, testing and marking of Group II electrical apparatus with type of protection n, intended for use only in areas where ex
22、plosive atmospheres of gas, vapour and mist are unlikely to occur or if they do occur, are likely to do so infrequently or for a short period only. This standard is applicable to non-sparking electrical apparatus and also to apparatus with parts or circuits producing arcs or sparks or having hot sur
23、faces which, if not protected in one of the ways specified in this standard, could be capable of igniting a surrounding explosive atmosphere. A non-incendive part is limited in use to the particular circuit for which it has been shown to be non-ignition capable and, therefore, cannot be separately a
24、ssessed as complying with this standard. This standard is applicable to electrical equipment and components of Group II, Category 3G. Such equipment is designed to be capable of functioning in conformity with the operating parameters established by the manufacturer and ensuring a normal level of pro
25、tection. Equipment in this category ensures the requisite level of protection during normal operation. NOTE 1In this standard the word apparatus has the same meaning as the word equipment used in the Directive. Compliance with this European Standard does not imply any removal of, or lowering of, the
26、 requirements of any other European Standard with which the electrical apparatus complies. This standard supplements, and may supersede, the requirements for apparatus for normal industrial applications. NOTE 2The application of this standard may require the exercise of engineering judgement because
27、 of the wide range of apparatus and technologies covered. If apparatus is to be certified the relevant requirements may need to be agreed between the manufacturer and the testing station. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other
28、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 re
29、vision. For undated references the latest edition of the publication referred to applies. EN 50014:1997, Electrical apparatus for potentially explosive atmospheres General requirements. EN 50020:1994, Electrical apparatus for potentially explosive atmospheres Intrinsic safety i. EN 60034-1, Rotating
30、 electrical machines Part 1: Rating and performance. EN 60034-5, Rotating electrical machines Part 5: Classification of degrees of protection provided by enclosures for rotating machines. EN 60068-2-27:1993, Basic environmental testing procedures Part 2: Tests Test Ea and guidance: Shock. EN 60068-2
31、-75, Environmental testing Part 2: Tests Test Eh: Hammer tests. EN 60081, Double-capped fluorescent lamps Performance specifications. EN 60155, Starters for tubular fluorescent lamps. EN 60238, Edison screw lampholders. EN 60269-3, Low-voltage fuses Part 3: Supplementary requirements for fuses for u
32、se by unskilled persons (fuses mainly for household and similar applications). EN 60400, Lampholders for tubular fluorescent lamps and starterholders. EN 60529:1991, Degrees of protection provided by enclosures (IP Code). EN 60598-1:1997, Luminaires Part 1: General requirements and tests. EN 60598-2
33、, Luminaires Part 2: Particular requirements. EN 60662, High-pressure sodium vapour lamps. EN 60920, Ballasts for tubular fluorescent lamps General and safety requirements. EN 60922, Auxiliaries for lamps Ballasts for discharge lamps (excluding fluorescent lamps) General and safety requirements. EN
34、60924, D.C. supplied electric ballasts for tubular fluorescent lamps General and safety requirements. EN 60926, Auxiliaries for lamps Starting devices (other than glow starters) General and safety requirements. EN 60927, Auxiliaries for lamps Starting devices (other than glow starters) Performance r
35、equirements. EN 60928, Auxiliaries for lamps A.C. supplied electronic ballasts for tubular fluorescent lamps General and safety requirements. EN 60947-1, Low-voltage switchgear and controlgear Part 1: General rules. EN 61048, Capacitors for use in tubular fluorescent and other discharge lamp circuit
36、s General and safety requirements. EN 61049, Capacitors for use in tubular fluorescent and other discharge lamp circuits Performance requirements. EN 61184, Bayonet lampholders. International Publications with references to the corresponding European publications IEC 60050, International Electrotech
37、nical Vocabulary. IEC 60060, High-voltage test techniques (HD 588 S1:1991, EN 60060-2:1994). IEC 60112, Method for determining the comparative and the proof tracking indices of solid insulating materials under moist conditions (HD 214 S2:1980). BSI 17 March 2006 Page 4 EN 50021:1999 IEC 60216-1, Gui
38、de for the determination of thermal endurance properties of electrical insulating materials Part 1: General guidelines for ageing procedure and evaluation of test results (HD 611.1 S1:1992). IEC 60216-2, Guide for the determination of thermal endurance properties of electrical insulating materials P
39、art 2: Choice of test criteria (HD 611.2 S1:1992). IEC 60664-1, Insulation co-ordination for equipment within low-voltage systems Part 1: Principles, requirements and test. (HD 625.1 S1:1996). ISO 179, Plastics Determination of charpy impact strength. ISO 4892, Plastics Methods of exposure to labora
40、tory light sources. 3 Definitions For the purposes of this standard, the following definitions apply. NOTEDefinitions which are identical with or technically equivalent to those given in IEC 60050, IEC 60664-1, and EN 50014 are identified as follows: IEC 60050 1) IEC 60664-1 2) EN 50014 3) 3.1 elect
41、rical apparatus3) items applied as a whole or in part for the utilization of electrical energy These include, among others, items for the generation, transmission, distribution, storage, measurement, regulation, conversion, and consumption of electrical energy and items for telecommunications. 3.2 e
42、xplosive gas atmosphere3) mixture with air, under atmospheric conditions, of flammable substances in the form of gas, vapour or mist, in which, after ignition, combustion spreads throughout the unconsumed mixture 3.3 type of protection3) specific measures applied to electrical apparatus to avoid ign
43、ition of a surrounding explosive atmosphere 3.4 type of protection n type of protection applied to electrical apparatus such that, in normal operation and in certain abnormal conditions specified by this standard, it is not capable of igniting a surrounding explosive atmosphere NOTE 1Additionally, t
44、he requirements of this standard are intended to ensure that a fault capable of causing ignition is not likely to occur. NOTE 2An example of a specified abnormal condition is a luminaire with failed lamp. 3.5 normal operation operation of apparatus conforming electrically and mechanically with its d
45、esign specification and used within the limits specified by the manufacturer NOTE 1The limits specified by the manufacturer may include persistent operational conditions, e.g. operation of a motor on a duty cycle. NOTE 2Variation of the supply voltage within stated limits (see 4.3.1.2) and any other
46、 operational tolerance is part of normal operation. 3.6 enclosure3) all the walls doors, covers, cable entries, rods, spindles, shafts, etc., which contribute to the type of protection and/or the degree of protection (IP) of the electrical apparatus 3.7 degree of protection of enclosure (IP)3) a num
47、erical classification preceded by the symbol IP applied to the enclosure of electrical apparatus to provide for: protection of persons against contact with or approach to live parts and against contact with moving parts (other than smooth rotating shafts and the like) inside the enclosure, and prote
48、ction of the electrical apparatus against ingress of solid foreign objects, and, where indicated by the classification, protection of the electrical apparatus against harmful ingress of water. NOTEThe enclosure which provides the degree of protection IP is not necessarily identical to the apparatus
49、enclosure for the types of protection listed in EN 50014:1997, 1.2. 3.8 non-sparking device a device constructed to minimize the risk of occurrence of arcs, sparks or hot spots capable of creating an ignition hazard during normal use Normal use excludes the removal or insertion of components with the circuit energized. 3.9 enclosed-break device device incorporating electrical contacts that are made