1、BRITISH STANDARDBS EN 61241-4:2006Electrical apparatus for use in the presence of combustible dust Part 4: Type of protection “pD”The European Standard EN 61241-4:2006 has the status of a British StandardICS 29.260.20g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54
2、g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Thu Apr 19 01:28:59 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS EN 61241-4:2006This British Standard was published under the authority of the Standards P
3、olicy and Strategy Committee on 28 February 2007 BSI 2007ISBN 978 0 580 50215 6National forewordThis British Standard was published by BSI. It is the UK implementation of EN 61241-4:2006. It is identical with IEC 61241-4:2001. It supersedes BS IEC 61241-4:2001, which will be withdrawn on 1 April 200
4、9. The UK participation in its preparation was entrusted by Technical Committee GEL/31, Equipment for explosive atmospheres, to Subcommittee GEL/31/20, Apparatus for use in the presence of ignitable dust.A list of organizations represented on GEL/31/20 can be obtained on request to its secretary.Thi
5、s 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 cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, n
6、a, Thu Apr 19 01:28:59 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD EN 61241-4 NORME EUROPENNE EUROPISCHE NORM December 2006 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung
7、 Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61241-4:2006 E ICS 29.260.20 English version Electrical apparatus for use in the presence of combustible dust Part 4:
8、 Type of protection “pD“ (IEC 61241-4:2001) Matriels lectriques destins tre utiliss en prsence de poussires combustibles Partie 4: Type de protection “pD“ (CEI 61241-4:2001) Elektrische Betriebsmittel zur Verwendung in Bereichen mit brennbarem Staub Teil 4: Zndschutzart “pD“ (IEC 61241-4:2001) This
9、European Standard was approved by CENELEC on 2006-04-01. 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 refer
10、ences 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 m
11、ember 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, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Irelan
12、d, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: Wang Bin, na, Thu Apr 19 01:28:59 GMT+00:00 2007, Uncontrolled Copy, (c) BSIForeword The text of the International
13、 Standard IEC 61241-4:2001, prepared by SC 31H, Apparatus for use in the presence of combustible dust, of IEC TC 31, Electrical apparatus for explosive atmospheres, was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 61241-4 on 2006-04-01. This European Standard is to
14、be read in conjunction with EN 61241-0 as applicable to “Equipment Group II, Categories 2D and 3D“. 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) 2007-07-01 latest date by w
15、hich the national standards conflicting with the EN have to be withdrawn (dow) 2009-04-01 This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and covers essential requirements of EC Directive 94/9/EC. See Annex
16、ZZ. Annexes ZA and ZZ have been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61241-4:2001 was approved by CENELEC as a European Standard without any modification. _ 2 EN 61241-4:2006Licensed Copy: Wang Bin, na, Thu Apr 19 01:28:59 GMT+00:00 2007, Uncontrolled Cop
17、y, (c) BSICONTENTS1 Scope 52 Normative references . 53 Definitions.64 Pressurization principle .94.1 Protective gas 94.2 Automatic disconnection.94.3 Cleaning 94.4 Discharge of protective gas 95 General constructional requirements .95.1 Electrical performance of apparatus .95.2 Mechanical strength .
18、95.3 Apertures 105.4 Electrical connections to enclosures 105.5 Doors and covers 106 Temperature limits 117 Safety provisions and safety devices (except for static pressurization) .117.1 General117.2 Pressure- or flow-activated devices 127.3 Electrical supply.127.4 Switching off electrical supply.12
19、7.5 Failure of pressurization.127.6 Level of overpressure.147.7 Possible sources of ignition147.8 Enclosed components 147.9 Separate enclosures 148 Safety provisions and safety devices for static pressurization.159 Supply of protective gas 159.1 Type of gas159.2 Second source of supply 169.3 Tempera
20、ture 1610 Verification and tests.1610.1 General1610.2 Type verification and tests1610.3 Overpressure test 1610.4 Minimum overpressure test 1710.5 Leakage test 1710.6 Impact test.1710.7 Routine tests17 3 EN 61241-4:2006Licensed Copy: Wang Bin, na, Thu Apr 19 01:28:59 GMT+00:00 2007, Uncontrolled Copy
21、, (c) BSI11 Marking1811.1 Pressurized enclosure.1811.2 Additional marking 1811.3 Pressurized enclosures protected by static pressurization1811.4 Any other marking required .18Annex A (normative) Ducts for protective gas supply19Annex B (normative) Installation requirements for pressurization22Annex
22、ZA (normative) Normative references to international publications with theircorresponding European publications22 Annex ZZ (informative) Coverage of Essential Requirements of EC Directives24 Figure A.1 Examples of the static overpressure along the ducts and through apressurized enclosure.20Figure A.
23、2 Example of the static overpressure in a pressurized electric rotatingmachine with fan 21Table 1 Requirements on failure of pressurization 13Table B.1 Summary of protection requirements for enclosures .22 4 EN 61241-4:2006Licensed Copy: Wang Bin, na, Thu Apr 19 01:28:59 GMT+00:00 2007, Uncontrolled
24、 Copy, (c) BSIELECTRICAL APPARATUS FOR USE IN THE PRESENCE OFCOMBUSTIBLE DUST Part 4: Type of protection “pD“1 ScopeThis part of IEC 61241 gives requirements on the design, construction, testing and marking ofelectrical apparatus for use in combustible dust atmospheres in which a protective gas (air
25、 orinert gas), maintained at a pressure above that of the external atmosphere, is used to preventthe entry of dust which might otherwise lead to the formation of a combustible mixture withinenclosures which do not contain a source of combustible dust.This standard contains the specific requirements
26、for construction and testing, includingprotective requirements that apply to electrical apparatus with type of protection pressurization“pD“ intended for use in potentially combustible dust atmospheres.This standard includes the requirements for the construction of the enclosure and itsassociated co
27、mponents, including, if any, the inlet and outlet ducts for the protective gas, andfor the safety provisions and devices necessary to ensure that pressurization is establishedand maintained for type of protection pressurization “pD“.Requirements for pressurized enclosures with an internal source of
28、dust release are notincluded in this standard.This standard does not cover the requirements for pressurized rooms with or without internalsources of dust release.This standard does not apply to dusts of explosives which do not require atmospheric oxygenfor combustion or to pyrophoric substances.This
29、 standard does not cover combined gas and dust hazard. Those requirements are underconsideration.The requirements contained in this standard are supplementary to those in IEC 61241-1-1.2 Normative referencesThe following normative documents contain provisions which, through reference in this text,co
30、nstitute provisions of this part of IEC 61241. For dated references, subsequent amendmentsto, or revisions of, any of these publications do not apply. However, parties to agreementsbased on this part of IEC 61241 are encouraged to investigate the possibility of applying themost recent editions of th
31、e normative documents listed below. For undated references, thelatest edition of the normative document referred to applies. Members of IEC and ISO maintainregisters of currently valid International Standards.IEC 60034-1:1996, Rotating electrical machines Part 1: Rating and performance 1)_1)There ex
32、ists a consolidated edition 10.2 (1999) that includes edition 10.0 and its amendments.EN 61241-4:2006 5 Licensed Copy: Wang Bin, na, Thu Apr 19 01:28:59 GMT+00:00 2007, Uncontrolled Copy, (c) BSIIEC 61241 (all parts), Electrical apparatus for use in the presence of combustible dustIEC 61241-1-1:1999
33、, Electrical apparatus for use in the presence of combustible dust Part 1-1: Electrical apparatus protected by enclosures and surface temperature limitation Specification for apparatusIEC 61241-1-2:1999, Electrical apparatus for use in the presence of combustible dust Part 1-2: Electrical apparatus
34、protected by enclosures and surface temperature limitation Selection, installation and maintenanceIEC 61241-3:1997, Electrical apparatus for use in the presence of combustible dust Part 3:Classification of areas where combustible dusts are or may be present3 DefinitionsFor the purpose of this part o
35、f IEC 61241, the definitions from IEC 61241-1-1 and the followingapply.3.1type of protection “pD“technique of applying a protective gas to an enclosure in order to prevent the formation of anexplosive dust atmosphere inside the enclosure by maintaining an overpressure against thesurrounding atmosphe
36、re3.2overpressurepressure above ambient pressure within a pressurized enclosure3.3pressurizationtechnique of guarding against the ingress of the external dust atmosphere, which may beexplosive, into an enclosure by maintaining a protective gas therein at a pressure above that ofthe external atmosphe
37、re3.4protective gasair or inert gas used for maintaining an overpressureNOTE For the purpose of this standard inert gas means nitrogen, carbon dioxide, argon or any gas which, whenmixed with oxygen in the ratio of 4:1 as found in air, does not make the ignition and combustible properties, such ascom
38、bustible limits, more onerous.3.5enclosureall the walls which surround the live parts of electrical apparatus including doors, covers, cableentries, rods, spindles and shafts and which ensure the protection of the electrical apparatus3.6pressurized enclosureenclosure in which protective gas is maint
39、ained at a pressure greater than that of the externalatmosphereNOTE The pressurized enclosure may or may not also be the enclosure surrounding the live parts and ensuringthe protection in other respects of the electrical apparatus. 6 EN 61241-4:2006Licensed Copy: Wang Bin, na, Thu Apr 19 01:28:59 GM
40、T+00:00 2007, Uncontrolled Copy, (c) BSI3.7static pressurizationmaintenance of an overpressure within a pressurized enclosure without the addition ofprotective gas in a hazardous area3.8pressurization with leakage compensationmaintenance of an overpressure within a pressurized enclosure so that, whe
41、n the outletapertures if any are closed, the supply of protective gas is sufficient to compensate for anyleakage from the pressurized enclosure and its ducts3.9pressurization with continuous flow of the protective gasmaintenance of an overpressure within a pressurized enclosure with continuous flow
42、of theprotective gas through the enclosure3.10electrical apparatusitems applied as a whole or in part for the utilization of electrical energy. These include, amongothers, items for the generation, transmission, distribution, storage, measurement, regulation,conversion, and consumption of electrical
43、 energy and items for telecommunications3.11ignition-capable apparatusapparatus which, in normal operation, constitutes a source of ignition for a specifiedcombustible dust atmosphere. This includes electrical apparatus not protected by a type ofprotection listed in IEC 61241-1-23.12self-revealing f
44、aultfault which would cause a malfunction of the apparatus necessitating correction beforeproceeding with further operation of the apparatus and which may be indicated, for example, byan audible or visible signal3.13openingaperture, door, window or non-airtight fixed panel3.14protective devicedevice
45、 provided to protect a system against conditions which could result in a fire or explosion3.15alarmpiece of apparatus that generates a visual or audible signal that is intended to attract attention3.16indicatorpiece of apparatus that shows flow or pressure and is monitored periodically, consistent w
46、iththe requirement of the application3.17protected apparatuselectrical apparatus internal to the pressurized enclosureEN 61241-4:2006 7 Licensed Copy: Wang Bin, na, Thu Apr 19 01:28:59 GMT+00:00 2007, Uncontrolled Copy, (c) BSI3.18pressurization systemgrouping of components used to pressurize and mo
47、nitor a pressurized enclosure3.19alternate (or auxiliary) source of supply of protective gassecond source of protective gas that may take over in the event of failure of the primary source3.20zonesclassified areas are divided into zones based upon the frequency and duration of theoccurrence of explo
48、sive dust/air mixtures. Dust layers should also be taken into considerationIEC 61241-3, definition 2.103.21zone 20area in which combustible dust, as a cloud, is present continuously or frequently, during normaloperation, in sufficient quantity to be capable of producing an explosive concentration of
49、combustible dust mixed with air, and/or where layers of dust of uncontrollable and excessivethickness can be formed.This can be the case inside dust containment areas where dust can form explosive mixturesfrequently or for long periods of time. This occurs typically inside equipmentIEC 61241-3, definition 2.113.22zone 21area not classified as zone 20 in which combustible dust, as a cloud, is likely to occur duringnormal operation, in sufficient quantities to be capable of producing an explosive concentrat
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