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1、BRITISH STANDARD BS EN 50017:1994 Electrical apparatus for potentially explosive atmospheres Powder filling “q” The European Standard EN 50017:1994 has the status of a British Standard UDC 621.31-78:614.833.4/5:001.4:620.1:62-777 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:19:18 GMT+00
2、:00 2006, Uncontrolled Copy, (c) BSI BS EN 50017:1994 This British Standard, having been prepared under the direction of the General Electrotechnical Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 October 1994 BSI 02-1999 The followin
3、g BSI references relate to the work on this standard: Committee reference GEL/114 Draft for comment 91/33085 DC ISBN 0 580 22386 8 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises t
4、he national committees of the following countries: AustriaItaly BelgiumLuxembourg DenmarkNetherlands FinlandNorway FrancePortugal GermanySpain GreeceSweden IcelandSwitzerland IrelandUnited Kingdom Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Mo
5、n Nov 06 07:19:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 50017:1994 BSI 02-1999i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 Text of EN 500173 National annex NA (informative) Committees responsible10 National annex NB (informative) Cross-referenc
6、esInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:19:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 50017:1994 ii BSI 02-1999 National foreword This British Standard has been prepared under the direction of the General Electrotechnical Standards Policy Committee and
7、is the English language version of EN 50017:1994 Electrical apparatus for potentially explosive atmospheres Powder filling “q” which is published by the European Committee for Electrotechnical Standardization (CENELEC). The standard should be read in conjuntion with BS EN 50014:1993 which it supplem
8、ents. Product certification. Users of this British Standard are advised to consider the desirability of third party certification or product conformity with this British Standard based on testing and continuing surveillance, which may be coupled with assessment of a suppliers quality systems against
9、 the appropriate Part of BS 5750. Enquiries as to the availability of third party certification schemes are forwarded by BSI to the Association of British Certification Bodies. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are r
10、esponsible 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, the EN title page, pages 2 to 10, an inside back cover and a back cov
11、er. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:19:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORM
12、E EUROPENNE EUROPISCHE NORM EN 50017 April 1994 UDC 621.31-78:614.833.4/5:001.4:620.1:62-777Supersedes EN 50017:1977 + A1:1979 To be read in conjunction with EN 50014:1992 Descriptors: Electrical apparatus, potentially explosive atmosphere, explosive atmosphere, explosion proofing, specific requirem
13、ent, powder filling “q” English version Electrical apparatus for potentially explosive atmospheres Powder filling “q” Matrial lectrique pour atmosphres explosibles Remplissage pulvrulent “q” Eleckrische Betriebsmittel fr explosionsgefhrdete Bereiche Sandkapselung “q” This European Standard was appro
14、ved by CENELEC on 6 July 1993. 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 nati
15、onal 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 languag
16、e 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, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Swit
17、zerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1994 Copyright reserved to CENELEC members Ref. No. EN
18、 50017:1994 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:19:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50017:1994 BSI 02-1999 2 Foreword This European Standard has been prepared by Working Group WG 31-04 and by the secretariat of CENELEC Technical Committee TC 31 in accordance w
19、ith the decisions taken by that committee during its meetings held in Brussels 1991, in Stockholm 1992 and Basle 1993. The text of the draft was submitted to the formal vote in December 1992 and was approved by CENELEC as EN 50017 on 1993-07-06. The following dates were fixed: Annexes designated nor
20、mative are part of the body of the standard. In this standard Annex A is normative. This European Standard is to be read in conjunction with EN 50014:1992 Electrical apparatus for potentially explosive atmospheres General requirements, and with the second editions of the European Standards for the s
21、pecific types of protection listed in the scope of EN 50014:1992. This European Standard should not be considered in conjunction with any of the first edition standards and their amendments, published in 1977 or thereafter, listed in EN 50014. Contents Page Foreword2 General 1Scope3 2Normative refer
22、ences3 3Definitions3 Constructional requirements 4Enclosure3 5Requirements for filling material4 6Distances4 7Use of materials5 8Cable entries and bushings5 9Energy storing devices5 10Temperature limitation5 11Fault conditions6 Verifications and tests 12Type verifications and tests7 13Routine verifi
23、cations and tests8 Marking 14Marking8 Annex A (normative) Test arrangement for the electrical strength test of the filling material9 Table 1 Distances inside the filling material5 Table 2 Creepage distances and distances through filling material6 latest date of publication of an identical national s
24、tandard(dop) 1994-08-01 latest date of withdrawal of conflicting national standards(dow) Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:19:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50017:1994 BSI 02-19993 General 1 Scope 1.1 This European Standard contains the specific requirements
25、 for the construction, testing and marking of electrical apparatus, parts of electrical apparatus and Ex components in the type of protection powder filling “q”, intended for use in potentially explosive atmospheres of gas, vapour and mist. NOTEPowder-filled electrical apparatus and Ex Components ma
26、y contain electronic circuits, transformers, protection fuses, relays, intrinsically safe electrical apparatus, associated electrical apparatus, switches etc. 1.2 This European Standard supplements EN 50014, the requirements of which apply to powder-filled electrical apparatus. 1.3 This European Sta
27、ndard applies only to electrical apparatus, parts of electrical apparatus and Ex components with a rated supply voltage less than or equal to 1 000 V; a rated current less than or equal to 16 A; a rated power less than or equal to 1 000 VA. 2 Normative references This European Standard incorporates
28、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 Sta
29、ndard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. 2.1 European Standards EN 50014:1992, Electrical apparatus for potentially explosive atmospheres General requirements. EN 50019:1994, Electrical apparatus fo
30、r potentially explosive atmospheres Increased safety “e”. EN 50020:1994, Electrical apparatus for potentially explosive atmospheres Intrinsic safety “i”. (Not yet published) EN 60529:1991, Degrees of protection provided by enclosures. (IP Code) (IEC 529:1989) 2.2 IEC Publications with reference to t
31、he relevant European Publications IEC 127: Series Miniature fuses. IEC 269: Series Low-voltage fuses. IEC 707:1981, Methods of test for the determination of the flammability of solid electrical insulating materials when exposed to an igniting source. 2.3 ISO ISO 565:1990, Test sieves Metal wire clot
32、h, perforated metal plate and electro formed sheet Nominal size of openings. ISO 1210:1982, Plastics Determination of flammability characteristics of plastics in the form of small specimens in contact with a small flame. 3 Definitions The following definitions specific to type of protection powder f
33、illing “q” are applicable in this European Standard; they supplement the definitions which are given in EN 50014. 3.1 powder filling “q” a type of protection in which the parts capable of igniting an explosive atmosphere are fixed in position and completely surrounded by filling material to prevent
34、the ignition of an external explosive atmosphere NOTEThe type of protection may not prevent the surrounding explosive atmosphere from penetrating into the apparatus and Ex components and being ignited by the circuits. However, due to the small free volumes in the filling material and due to the quen
35、ching of a flame which may propagate through the paths in the filling material, an external explosion is prevented. 3.2 filling material quartz or glass particles 3.3 creepage distance the shortest distance between two conducting parts along the surface of the insulating parts 3.4 working voltage hi
36、ghest r.m.s. value of the a.c. or d.c. voltage which may occur (locally) across any insulation at rated supply voltage, transients being disregarded, in open circuit conditions or under normal operating conditions Constructional requirements 4 Enclosure 4.1 Mechanical strength The apparatus, part of
37、 electrical apparatus and Ex components protected by powder filling “q” shall comply with the high impact energy requirements of 23.4.3 of EN 50014 and shall meet the pressure test requirements specified in clause 12 and 13 of this standard. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:
38、19:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50017:1994 4 BSI 02-1999 Apparatus or Ex components intended to be mounted inside another enclosure which complies with the requirements for enclosures defined in EN 50014 including the requirements in 23.4.3 are only required to meet the pressure
39、test requirements specified in clause 12 and 13 of this standard. This apparatus shall be marked with the symbol “X” according to 27.2. 9) of EN 50014 if not an Ex component. 4.2 Degree of protection of the enclosure The enclosure of the powder-filled apparatus, powder-filled part of the apparatus o
40、r powder-filled Ex component in its normal service condition, i.e. with all openings closed as in normal use, shall comply at least with the degree of protection IP 54 as defined in EN 60529. If the degree of protection is IP 55 or higher, the enclosure shall be provided with a breathing device. The
41、 enclosure with the breathing device in place shall comply with the degree of protection IP 54 according to EN 60529. Enclosures of powder-filled apparatus or powder-filled parts of apparatus intended for use only in clean, dry rooms, shall comply at least with degree of protection IP 43 as defined
42、in EN 60529. These enclosures shall be marked with the symbol “X”. When the enclosures of powder-filled apparatus, powder-filled parts of apparatus or powder-filled Ex components, are intended to be mounted inside another enclosure complying with EN 50014, this outer enclosure shall have a degree of
43、 protection of at least IP 54. The IP code of the inner enclosure does not need to be stated. The maximum gap of an enclosure shall be at least 0,1 mm smaller than the smallest dimension of the actual filling material not exceeding 0,9 mm, so that no filling material can escape. 4.3 Filling Filling
44、shall be carried out so as not to leave any voids within the filling material (e.g. by shaking down). The free space within powder-filled electrical apparatus, parts of electrical apparatus or Ex components shall be completely filled with filling material (see also 6.2). 4.4 Means of closing Enclosu
45、res of powder-filled apparatus, powder-filled parts of apparatus or powder-filled Ex components shall be factory-sealed and shall not be capable of being opened without destroying the enclosure or the means of closing. Filling openings shall be closed in the same way. NOTESuitable assembly technique
46、s are e.g. welding, soldering, cemented joints, rivets, cementing of screws. 5 Requirements for filling material 5.1 The documents presented by the manufacturer and verified by the testing station in accordance with 23.2 of EN 50014 shall describe precisely the filling material as well as the fillin
47、g process and the measures taken to ensure proper filling. 5.1.1 The description shall include: name and address of the manufacturer of the filling material; exact and complete reference of the filling material; size of granules (see 5.1.2); 5.1.2 Size of granules The size of granules shall lie with
48、in the following sieve limits according to ISO 565: upper limit: metal wire cloth or perforated metal plate with nominal size of opening of 1 mm lower limit: metal wire cloth with nominal size of opening of 0,5 mm 5.1.3 Only quartz or solid glass particles are allowed. 5.1.4 The testing station is n
49、ot required to verify compliance of the filling material with 5.1.1, 5.1.2 and 5.1.3. 5.2 The filling material shall be subjected to an electric strength test defined in clause 12 and 13. The leakage current through the filling material shall not exceed 106 A. 6 Distances 6.1 Except where specified otherwise in this standard the minimum distance through the filling material between electrically conducting parts of the apparatus and insulated components on the one hand, and the inner surface of the enclosure on the other hand