1、STD-BSI BS EN ZBBLib-ENGL 1993 lb24bb9 0904673 3bT m BRITISH STANDARD Small craft - Electrical devices - Protection against ignition of surrounding flammable gases The European Standard EN 28846:1993, with the incorporation of amendment A1:2000, has the status of a British Standard ICs 47.080 BS EN
2、28846:1993 Incorporating Amendment No. i NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMIITED BY COPYRIGHT LAW STD-BSI BS EN 2884b-ENGL I993 D Lb24bb9 0904b74 2Tb Amd. No. Date BS EN 28846:1993 Comments Cooperating organizations 12066 The following BSI references relate to the work on this standard
3、 Committee reference GMW33 Draft for comment 89176566 DC The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: May 2001 Indicated by a sideline Austria Belgium Denmark
4、Finland France Germany Greece Iceland Ireland Italy Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland United Kingdom Oesterreichisches Normungsinstitut Institut belge de normalisation Dansk Standardiseringsraad Suomen Standardisoimisliito, r.y. Association franaise de normalisation Deu
5、tsches Institut fr Normung e.V. Hellenic Organization for Standardization Technological Institute of Iceland National Standards Authority of Ireland Ente Nazionale Italiano di Unificazione Inspection du Travail et des Mines Nederlands Normalisatie-instituut Norges Standardiseringsforbund Instituto P
6、ortugus da Qualidade Asociacin Espaola de Normalizacin y Certificacin Standardiseringskommissionen i Sverige Association suisse de normalisation British Standards Institution This British Standard, having been prepared under the direction of the General Mechanical Engineering Standards Policy Commit
7、tee, was published under the authority of the Standards Committee and comes into effect on 15 November 1993 O BSI 05-2001 STD.BSI BS EN 28846-ENGL 1793 9 Lb24bb 0704675 332 E BSEN28846:1993 Contents Cooperating organizations National foreword Page Inside front cover 11 Foreword 1 Scope 2 Definitions
8、 3 Test programme 4 External surface temperature test 5 Test method - Sealed devices 6 Test method - Non-sealed devices 7 Marking Annex A (informative) Bibliography 10 Annex ZB (informative) Clauses of this European Standard addressing essential requirements or other provisions of EU Directives Nati
9、onal annex NA (informative) Committees responsible National annex NB (informative) Cross-references Figure 1 - Water chamber for sealed devices Figure 3 - Test assembly for small non-sealed electrical devices 10 I 11 11 4 6 7 Figure 2 - Test assembly for large non-sealed electrical devices i O BSI 0
10、5-2001 STD*BSI BS EN 2884b-ENGL 1993 - 1b24bb9 0904b7b 079 BS EN 28846:1993 National foreword This British Standard has been prepared under the direction of the General Mechanical Engineering Standards Policy Committee and is the English language version of EN 28846:1993 Small craft -Electrical devi
11、ces -Protection against ignition of surrounding flammable gases, including amendment A1:2000, I published by the European Committee for Standardization (CEN). This standard supersedes BS 7489: 1991, which is withdrawn. EN 28846 was produced as a result of international discussion in which the United
12、 Kingdom took an active part. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these internatio
13、nal or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions o
14、f a contract. 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, the EN title page, page
15、s 2 to 11 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Sidelining in this document indicates the most recent changes by amendment. Q BSI 05-2001 EUROPEAN STANDARD EN 28846 NORME EUROPENNE August 1993 EUROPISCHE NORM +Al September
16、2000 UDC 629.125:621.3:614.838 Descriptors: shipbuilding, yachts, fire protection, explosion, proofing, explosive atmospheres, flammable gases, electric equipment, flameproof enclosures, tests, flammability testing, marking English version Small craft - Electrical devices - Protection against igniti
17、on of surrounding flammable gases (includes amendment A1:2000) (IS0 8846: 1990, modified) ?!.dvires de plaisance - Equipements Kleine Wasserfahrzeuge - Elektr,uche lectriques - Protection contre Gerte - Zndschutz gegenber linflammation des gaz inflammables entflammbaren Gasen environnants (enthlt nd
18、erung A1:2000) (inclut lamendement A1:2000) (IS0 8846:1990, modifiziert) (IS0 8846: 1990, modifie) This European Standard was approved by CEN on 1993-08-19. Amendment Al was approved by CEN on 2000-10-01. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the co
19、nditions 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 CEN member. The European Standard exists in thre
20、e official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Aus
21、tria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Centra
22、l Secretariat: rue de Stassart 36, B-1050 Brussels O 1993 Copyright reserved to CEN members Ref. No. EN 28846:1993 +A1:2000 E STDaBSI BS EN 28846-ENGL 1993 1624bb9 0904678 941 = EN 28846:1993 Foreword to amendment Al This amendment EN 28846:1993/A1:2000 to EN 28846:1993 has been prepared by CEN/CMC.
23、 This amendment to the European Standard EN 28846:1993 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 2001, and conflicting national standards shall be withdrawn at the latest by March 2001. This amendment to the
24、 European Standard EN 28846:1993 has been prepared under a mandate 1 given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZB, which is an integral part of
25、this standard. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherland
26、s, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. l 8 BSI 05-2001 2 1 Scope This International Standard describes test methods and requirements for the design of electrical devices to be used on small craft so that they may be operated in an explosive atmosphere without ignitin
27、g surrounding flammable gases. It does not require explosion-proof or explosion-protected electrical apparatus as defined in IEC 79-0.1 This International Standard does not cover ignition protection procedures for products or components that may operate in hydrogen and air mixtures. Nor does it cove
28、r mechanisms of ignition from external sources, such as static electricity, lightning or other factors not related to the apparatus under test. 2 Definitions For the purposes of this International Standard, the following definitions apply. 2.1 flammable hydrocarbon mixture mixture of propane and air
29、 (per cent by volume) between the Lower Explosive Limit (LEL) and Upper Explosive Limit (UEL) that will explode if ignited by any means. Tests using propane and air are considered to cover marine fuel and air mixtures between the LEL and UEL 2.2 ignition-protected device device that complies with th
30、e requirements of one of the test programmes given in clause 3 2.3 ignition source a) Any electrical contacts, commutator or brush assembly, or collector ring and brushes that may produce electrical arcs of ignition-capable energy. b) Resistor or other component or surface that may operate at a temp
31、erature sufficient to ignite a flammable mixture. 2.4 normal operating conditions any operating conditions of the device, including the maximum achievable overload up to 400 % of the rated current (circuit breakers, switches and the like) and a stalled rotor condition for any motor with the circuit
32、protected by an overcurrent protective device specified by the product manufacturer 3 Test programme 3.1 The external surface temperature test shall be carried out according to clause 4. 3.2 Electrical devices which can generate sparks or arcs under operation (switches, relays, generators, fuses, di
33、stributors, cranking motors, etc.) shall be tested according to clause 5 if they can be considered sealed and according to clause 6 if they are non-sealed. 3.3 Electrical devices showing an increase of the external surface temperature of more than 100 “C above ambient under operation shall be tested
34、 according to clause 4. Electrical devices not rated for continuous operation and wired with momentarily operated switches, such as engine-cranking motors, propulsion unit trim motors and other intermittently operated devices, are exempt from this test. 4 External surface temperature test 4.1 The el
35、ectrical device shall be placed in a closed, thermally insulated air-circulating oven having an initial temperature of 60 “C f 2 OC. Suitable heating shall be provided in addition to that generated by the component in order to keep the temperature in the oven constant at 60 “C f 2 “C. 4.2 The test v
36、oltage supply shall be adjusted within the range of 80 % to 120 % of the nominal system voltage giving the greatest temperature increase. 4.3 The electrical device shall be operated continuously for a minimum of 7 h in the mode in which it draws its maximum current. 4.4 The maximum allowable surface
37、 temperature is 200 “C, measured at any point on the electrical device exterior. 3 O BSI 05-2001 STD.BS1 BS EN 2884b-ENGL 1993 = Lb24bb9 0904b8U 5TT EN 28846:1993 5 Test method - Sealed devices Electrical devices which under operation can produce sparks or arcs shall be tested according to 5.1 and 5
38、.2 if they are considered so tight that no surrounding gases can penetrate into them. 5.1 Equipment A water chamber, as shown in Figure 1, is needed. 5.2 Test procedure 5.2.1 Submerge the electrical device to be tested in a water chamber at ambient temperature, changing its attitude if necessary so
39、that all possible sources of leaks are at the top and are 340 mm to 370 mm below the water surface. Submerged time is 15 min for each attitude change. 5.2.2 Observe the electrical device under test carefully throughout the test duration for a leak as evidenced by the generation of a bubble or stream
40、 of bubbles. E E Ln +I F E E VI Ln m I Water chamber Water Device under test Figure 1 - Water chamber for sealed devices 5.2.3 If bubbles are observed coming out of the electrical portion of the device, the electrical device shall not be considered sealed and shall be tested under clause 6. 5.2.4 If
41、 no bubbles are observed, remove the electrical device from the water chamber and dry its exterior. 5.2.5 Dismantle the electrical device for internal inspection. 5.2.6 If no water is found inside the electrical device, it shall be accepted as a sealed ignition-protected device. If water is found, i
42、t shall be tested according to clause 6. 4 8 BSI 05-2001 - - STD-BSI BS EN 2884b-ENGL I1773 Lb24bb 0704683 436 m EN 28846:1993 6 Test method - Non-sealed devices Testing according to 6.1 to 6.4 shall be carried out on electrical devices which under operation can produce sparks or arcs and are consid
43、ered to be open so that surrounding gases can penetrate into them. Electrical devices which after testing according to clause 5 have been found to be non-sealed shall also be tested as in 6.1 to 6.4. 6.1 Equipment A test assembly as shown in Figure 2 for large non-sealed electrical devices or Figure
44、 3 for small non-sealed electrical devices is needed. The test chamber shall be equipped with a pressure-relief lid. 6.2 Electrical device preparation 6.2.1 Provide means of allowing a combustible mixture of propane and air into the electrical device via a 150 mm minimum length of rigid or flexible
45、tubing having an inside diameter of 1,5 mm to 6,5 mm, the selection to be based on the minimum inside diameter that can maintain a test rate which allows a minimum of two electrical device ignitions per minute. The tubing supplying the mixture sample from the device to the analyser (see Figure 2) sh
46、all have a 1,5 mm inside diameter, and a minimum length of 150 mm. 6.2.2 Electrical devices that do not contain openings large enough to allow the mixture in at the required rate shall have a vent in the form of a copper tube of 150 mm minimum length installed in the electrical device with the free
47、end open to the chamber. The inside diameter of the copper vent tube shall be the same as that required to feed the electrical device. 6.2.3 Electrical devices which are too small for direct installation of both the tube feeding the electrical device and that supplying the electrical device gas anal
48、yser require a tee fitting to join the tubes from which a single 150 mm minimum length 1,5 mm inside diameter, rigid or flexible tubing can then enter the electrical device (see Figure 3). 6.2.4 The electrical device contacts or a separately mounted spark-plug or spark-plug-like item is required to
49、provide a gap across which a spark can jump. The gap size need only be large enough consistently to ignite the specified mixture. However, where possible a 2,5 mm gap is preferred. The spark gap provided shall be installed as close as possible to the part in the electrical device from which the arc would normally originate. Electric motors, for example, shall have a spark-plug mounted at the commutator end of the motor. 6.2.5 The test chamber ignition system shall be a single-shot spark system to ensure that the surrounding mixture is easily ignitable. 6.2
