1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationFire hazard testing Part 11-4: Test flames 50 W flame Apparatus and confirmational test methodBS EN 60695-11-4:2011National forewordThis British Standard is the UK implementation
2、 of EN 60695-11-4:2011. It is identical to IEC 60695-11-4:2011. It supersedes DD IEC/TS 60695-11-4:2004,which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee GEL/89, Fire hazard testing.A list of organizations represented on this committee can be obtained on
3、 request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 68527 9 ICS 13.220.40; 29.020Compliance wi
4、th a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 February 2012.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 60695-11-4:2011EUROPEAN S
5、TANDARD EN 60695-11-4 NORME EUROPENNE EUROPISCHE NORM November 2011 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2011 CENELEC - A
6、ll rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60695-11-4:2011 E ICS 13.220.40; 29.020 English version Fire hazard testing - Part 11-4: Test flames - 50 W flame - Apparatus and confirmational test method (IEC 60695-11-4:2011) Essais relatif
7、s aux risques du feu - Partie 11-4: Flammes dessai - Flamme de 50 W - Appareillage et mthodes dessai de vrification (CEI 60695-11-4:2011) Prfungen zur Beurteilung der Brandgefahr - Teil 11-4: Prfflammen - 50 W Prfflamme - Prfeinrichtungen und Prfverfahren zur Besttigung (IEC 60695-11-4:2011) This Eu
8、ropean Standard was approved by CENELEC on 2011-11-01. 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 referen
9、ces concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre 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 C
10、ENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germ
11、any, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 60695-11-4:2011EN 60695-11-4:2011 Foreword The text of document 89/1060/FDIS, future e
12、dition 1 of IEC 60695-11-4, prepared by IEC/TC 89 “Fire hazard testing“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60695-11-4:2011. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identica
13、l national standard or by endorsement (dop) 2012-08-01 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2014-11-01 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or
14、CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 60695-11-4:2011 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following note has to
15、 be added for the standard indicated: IEC 60695-11-2:2003 NOTE Harmonized as EN 60695-11-2:2003 (not modified). BS EN 60695-11-4:2011EN 60695-11-4:2011 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced docu
16、ments are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by common modificatio
17、ns, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60584-1 1995 Thermocouples - Part 1: Reference tables EN 60584-1 1995 IEC 60584-2 + A1 1982 1989 Thermocouples - Part 2: Tolerances EN 60584-2 1993 IEC Guide 104 1997 The preparation of safety publications and
18、the use of basic safety publications and group safety publications - - ISO/IEC Guide 51 1999 Safety aspects - Guidelines for their inclusion in standards - - ISO 13943 2008 Fire safety - Vocabulary EN ISO 13943 2010 ASTM B187 - Standard Specification for Copper, Bus Bar, Rod, and Shapes and General
19、Purpose Rod, Bar, and Shapes - - BS EN 60695-11-4:201160695-11-4 IEC:2011 CONTENTS INTRODUCTION . 5 1 Scope . . 6 2 Normative references. . 6 3 Terms and definitions . 6 4 Production of a standardized 50 W nominal test flame. 7 4.1 Requirements . 7 4.2 Apparatus and fuel 8 4.2.1 Burner . 8 4.2.2 Flo
20、wmeter 8 4.2.3 Manometer 8 4.2.4 Control valve . . 8 4.2.5 Copper block . . 8 4.2.6 Thermocouple . 8 4.2.7 Temperature/time indicating/recording devices 9 4.2.8 Fuel gas . . 9 4.2.9 Laboratory fumehood/chamber . 9 4.3 Production of the test flame . 9 4.4 Confirmation of the test flame 9 4.4.1 Princi
21、ple . . 9 4.4.2 Procedure 10 4.4.3 Verification . 10 5 Classification and designation . 10 Annex A (normative) Test arrangements . . 13 Annex B (informative) Recommended arrangements for the use of the test flame . . 17 Annex C (informative) Clearance gauge . . 18 Annex D (informative) Test arrangem
22、ents for tests on equipment . 19 Annex E (informative) Test arrangements for tests on bar test specimens 20 Bibliography . 21 Figure 1 Copper block . . 11 Figure 2 Flame height gauge . 12 Figure A.1 Burner General assembly . . 13 Figure A.2 Burner details 14 Figure A.3 Supply arrangement for burner
23、(example) . 15 Figure A.4 Confirmatory test arrangement . 16 Figure C.1 Clearance gauge . . 18 Figure D.1 Examples of test arrangements . 19 Figure E.1 Examples of test arrangements . 20 BS EN 60695-11-4:201160695-11-4 IEC:2011 5 INTRODUCTION The best method for testing electrotechnical products wit
24、h regard to fire hazard is to duplicate exactly the conditions occurring in practice. In most instances, this is not possible. Accordingly, for practical reasons, the testing of electrotechnical products with regard to fire hazard is best conducted by simulating as closely as possible the actual eff
25、ects occurring in practice. Work initiated by ACOS resulted in a series of standards that make available standardized test flames covering a range of powers for the use of all product committees needing such test flames. A needle flame is described in IEC 60695-11-5, two 500 W flames are described i
26、n IEC 60695-11-4, and a 1 kW flame is described in IEC 60695-11-2. This international standard provides a description of the apparatus required to produce a 50 W test flame and a description of a calibration procedure to check that the test flame produced meets given requirements. Guidance on confir
27、matory tests for test flames is given in IEC 60695-11-40. Three 50 W test flame methods (A, B and C) were originally specified in IEC/TS 60695-11-4:2000, with the intention that users would determine a ranking preference. This process has resulted in two of these flame methods being withdrawn, as sh
28、own below: 50 W test flame method Flame type Gas Approximate flame height / mm A Pre-mixed Methane 20 B Withdrawn C Withdrawn The method described in Clause 4 of this standard is the method that was originally designated as Method A. It produces a 50 W nominal test flame using a single gas supply tu
29、be, a needle valve to adjust the gas back pressure, a flowmeter to adjust the gas flow rate, and adjustable air ports on the burner tube. The flame is produced by burning methane, and the method makes use of a more tightly specified version of a burner that was used in some countries for many years.
30、 The method has been developed as a technical enhancement of previous technology. BS EN 60695-11-4:2011 6 60695-11-4 IEC:2011 FIRE HAZARD TESTING Part 11-4: Test flames 50 W flame Apparatus and confirmational test method 1 Scope This part of IEC 60695 provides detailed requirements for the productio
31、n of a 50 W nominal, pre-mixed type test flame. The approximate overall height of the flame is 20 mm. Details are given for confirmation of the test flame. This basic safety publication is intended for use by technical committees in the preparation of standards in accordance with the principles laid
32、 down in IEC Guide 104 and ISO/IEC Guide 51. One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications. The requirements, test methods or test conditions of this basic safety publication will not appl
33、y unless specifically referred to or included in the relevant publications. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the refere
34、nced document (including any amendments) applies. IEC 60584-1:1995, Thermocouples Part 1: Reference tables IEC 60584-2:1989, Thermocouples Part 2: Tolerances Amendment 1 IEC Guide 104:1997, The preparation of safety publications and the use of basic safety publications and group safety publications
35、ISO/IEC Guide 51:1999, Safety aspects Guidelines for their inclusion in standards ISO/IEC 13943:2008, Fire safety Vocabulary ASTM-B187/B187M-06, Standard Specification for Copper, Bus Bar, Rod, and Shapes and General Purpose Rod, Bar, and Shapes 3 Terms and definitions For the purposes of this docum
36、ent, the terms and definitions given in ISO/IEC 13943, some of which are reproduced below for the users convenience, as well as the following apply 3.1 burn, intransitive verb undergo combustion ISO/IEC 13943, definition 4.28 BS EN 60695-11-4:201160695-11-4 IEC:2011 7 3.2 burn, transitive verb cause
37、 combustion ISO/IEC 13943, definition 4.29 3.3 combustion exothermic reaction of a substance with an oxidizing agent NOTE Combustion generally emits fire effluent accompanied by flames and/or glowing. ISO/IEC 13943, definition 4.46 3.4 draught-free environment space in which the results of experimen
38、ts are not significantly affected by the local air speed NOTE A qualitative example is a space in which a wax candle flame remains essentially undisturbed. Quantitative examples are small-scale fire tests in which a maximum air speed of 0,1 ms1or 0,2 ms1is sometimes specified. ISO/IEC 13943, definit
39、ion 4.70 3.5 fire hazard physical object or condition with a potential for an undesirable consequence from fire ISO/IEC 13943, definition 4.112 3.6 flame, noun rapid, self-sustaining, sub-sonic propagation of combustion in a gaseous medium, usually with emission of light ISO/IEC 13943, definition 4.
40、133 3.7 pre-mixed flame flame in which combustion occurs in an intimate mixture of fuel and oxidizing agent ISO/IEC 13943, definition 4.259 3.8 standardized 50 W nominal test flame test flame that conforms to this international standard and meets all of the requirements given in Clause 4 4 Productio
41、n of a standardized 50 W nominal test flame 4.1 Requirements A standardized 50 W nominal test flame, according to this method, is one that is produced using hardware according to Figures A.1 and A.2, supplied with methane gas of purity not less than 98 % at a flow rate equivalent to 105 ml/min 5 ml/
42、min at 23 C, 0,1 MPa1, using the arrangement of Figure A.3. 1When corrected from measurements taken under actual conditions of use. BS EN 60695-11-4:2011 8 60695-11-4 IEC:2011 NOTE The expected back pressure is less than 10 mm of water. The flame shall be symmetrical, stable and give a result of 44
43、s 2 s in the confirmatory test described in 4.4. The confirmatory test arrangement shown in Figure A.4 shall be used. The overall height of the flame should be typically within the range 18 mm to 22 mm, but targeted towards 20 mm when measured using the flame height gauge as described in Figure 2, i
44、n the laboratory fumehood/chamber (see 4.2.9). 4.2 Apparatus and fuel 4.2.1 Burner The burner shall be in accordance with Figures A.1 and A.2. NOTE The burner tube, gas injector and needle valve are removable for cleaning purposes. Care should be taken on re-assembly that the needle valve tip is not
45、 damaged and that the needle valve and valve seat (gas injector) are correctly aligned. 4.2.2 Flowmeter The flowmeter shall be appropriate for the measurement of a gas flow rate of 105 ml/min at 23 C, 0,1 MPa 1to a tolerance of 2 %. NOTE A mass flowmeter is the preferred means of controlling accurat
46、ely the input flow rate of fuel to the burner. Other methods may be used if they can show equivalent accuracy. 4.2.3 Manometer The manometer shall be appropriate for the measurement of pressure in the range of 0 kPa to 7,5 kPa. Water manometers may be used for this purpose. They should be adapted to
47、 read 0 kPa to 7,5 kPa. NOTE A manometer is required in conjunction with a mass flowmeter in order to maintain the required back pressure. 4.2.4 Control valve A control valve is required to set the gas flow rate. 4.2.5 Copper block The copper block shall be 5,50 mm in diameter, of mass 1,76 g 0,01 g
48、 in the fully machined but undrilled state as shown in Figure 1. There is no verification method for the copper block. Laboratories are encouraged to maintain a standard reference unit, a secondary standard reference unit and a working unit, cross-comparing them as appropriate to verify the working
49、system. 4.2.6 Thermocouple A mineral insulated, metal sheathed fine-wire thermocouple with an insulated junction, is used for measuring the temperature of the copper block. The thermocouple shall be Class 1 in accordance with IEC60584-2. It shall have an overall nominal diameter of 0,5 mm and wires of, for example, NiCr and NiAl (type K in accordance with IEC 60584-1) with the welded point located inside the sheath. The sheath shall consist
