SIST EN 60695-11-3:2012
(Main)Fire hazard testing - Part 11-3: Test flames - 500 W flames: Apparatus and confirmational test methods
Fire hazard testing - Part 11-3: Test flames - 500 W flames: Apparatus and confirmational test methods
This part of IEC 60695-11 provides detailed requirements for the production of either of two 500 W nominal, pre-mixed type test flames. The approximate overall height of each flame is 125 mm. Two methods of producing a test flame are described: Method A uses methane. Method C can use either methane or propane. This basic safety publication is intended for use by technical committees in the preparation of standards in accordance with the principles laid 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 apply unless specifically referred to or included in the relevant publications.
Prüfungen zur Beurteilung der Brandgefahr - Teil 11-3: Prüfflammen - 500 W Prüfflamme - Prüfeinrichtungen und Prüfverfahren zur Bestätigung
Essais relatifs aux risques du feu - Partie 11-3: Flammes d'essai - Flamme de 500 W: Appareillage et méthodes d'essai de vérification
La CEI 60695-11-3:2012 donne les exigences détaillées pour la production de deux flammes d'essai de 500 W (valeur nominale), de type à prémélange. La hauteur totale de chaque flamme est de 125 mm approximativement. Deux méthodes sont décrites pour la production de la flamme d'essai: - La méthode A utilise le méthane. - La méthode C peut utiliser soit du méthane soit du propane. La présente publication fondamentale de sécurité est destinée aux comités d'études dans le cadre de l'élaboration de normes conformes aux principes exposés dans le Guide CEI 104 et le Guide ISO/CEI 51. Cette première édition de la CEI 60695-11-3 annule et remplace la deuxième édition de la Spécification Technique CEI/TS 60695-11-3 publiée en 2004. Elle constitue une révision technique et elle a désormais statut de Norme Internationale. Par rapport à l'édition antérieure, le principal changement est l'intégration de modifications éditoriales et techniques mineures dans tout le texte. Elle a le statut de publication fondamentale de sécurité conformément au Guide 104 de la CEI et au Guide ISO/CEI 51. Mots clé: Risques du feu, Flammes d'essai, Flamme de 500 W
Preskušanje požarne ogroženosti - 11-3. del: Preskusni plameni - 500-vatni plameni: Aparat in metode potrjevanja preskusov
Ta del standarda IEC 60695-11 podaja podrobne zahteve za katerega koli od dveh 500-vatnih nazivnih, predmešanih testnih plamenov. Primerna celotna višina vsakega plamena je 125 mm. Opisani sta dve metodi proizvajanja testnega plamena: Metoda A uporablja metan. Metoda C lahko uporablja metan ali propan. Ta osnovna varnostna publikacija je namenjena tehničnim odborom za pripravo standardov v skladu z načeli vodil IEC Guide 104 in ISO/IEC Guide 51. Ena od odgovornosti tehničnih odborov je, da med pripravo publikacij uporabljajo osnovne varnostne publikacije, kadar je to primerno. Zahteve, preskusne metode ali preskusni pogoji iz te osnovne varnostne publikacije se ne uporabljajo, razen če so izrecno navedeni ali zajeti v ustrezne publikacije.
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Preskušanje požarne ogroženosti - 11-3. del:
Preskusni
plameni - 500-vatni plameni: Aparat in metode potrjevanja preskusovPrüfungen zur Beurteilung der Brandgefahr - Teil 11-3: Prüfflammen - 500 W Prüfflamme - Prüfeinrichtungen und Prüfverfahren zur BestätigungEssais relatifs aux risques du feu - Partie 11-3: Flammes d'essai - Flamme de 500 W: Appareillage et méthodes d'essai de vérificationFire hazard testing - Part 11-3: Test flames - 500 W flames: Apparatus and confirmational test methods29.020Elektrotehnika na splošnoElectrical engineering in general13.220.40Sposobnost vžiga in obnašanje materialov in proizvodov pri gorenjuIgnitability and burning behaviour of materials and productsICS:Ta slovenski standard je istoveten z:EN 60695-11-3:2012SIST EN 60695-11-3:2012en,fr01-december-2012SIST EN 60695-11-3:2012SLOVENSKI
STANDARD
SIST EN 60695-11-3:2012
EUROPEAN STANDARD EN 60695-11-3 NORME EUROPÉENNE
EUROPÄISCHE NORM October 2012
CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2012 CENELEC -
All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60695-11-3:2012 E
ICS 13.220.40; 29.020
English version
Fire hazard testing -
Part 11-3: Test flames - 500 W flames -
Apparatus and confirmational test methods (IEC 60695-11-3:2012)
Essais relatifs aux risques du feu -
Partie 11-3: Flammes d'essai -
Flamme de 500 W -
Appareillage et méthodes d'essai
de vérification (CEI 60695-11-3:2012)
Prüfungen zur Beurteilung
der Brandgefahr -
Teil 11-3: Prüfflammen -
500-W-Prüfflamme -
Prüfeinrichtungen und Prüfverfahren
zur Bestätigung (IEC 60695-11-3:2012)
This European Standard was approved by CENELEC on 2012-09-17. 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 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 CENELEC 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
SIST EN 60695-11-3:2012
EN 60695-11-3:2012 - 2 - Foreword The text of document 89/1113/FDIS, future edition 1 of IEC 60695-11-3, prepared by IEC/TC 89 "Fire hazard testing" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60695-11-3:2012. The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2013-06-17 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2015-09-17
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.
This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment Designed for Use within Certain Voltage Limits (LVD - 2006/95/EC). Endorsement notice The text of the International Standard IEC 60695-11-3:2012 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60695-11-2:2003 NOTE Harmonised as EN 60695-11-2:2003 (not modified). IEC 60695-11-4:2011 NOTE Harmonised as EN 60695-11-4:2011 (not modified).
SIST EN 60695-11-3:2012
- 3 - EN 60695-11-3:2012 Annex ZA
(normative)
Normative references to international publications with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. 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 modifications, 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 1)
IEC Guide 104 1997 2) The preparation of safety publications and 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/B187M-06 - Standard Specification for Copper, Bus Bar, Rod, and Shapes and General Purpose Rod, Bar, and Shapes - -
1) EN 60584-2 includes A1 to IEC 60584-2. 2) Superseded by IEC Guide 104:2010. SIST EN 60695-11-3:2012
SIST EN 60695-11-3:2012
IEC 60695-11-3 Edition 1.0 2012-08 INTERNATIONAL STANDARD NORME INTERNATIONALE Fire hazard testing –
Part 11-3: Test flames – 500 W flames – Apparatus and confirmational test methods
Essais relatifs aux risques du feu –
Partie 11-3: Flammes d'essai – Flamme de 500 W – Appareillage et méthodes d'essai de vérification
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE U ICS 13.220.40; 29.020 PRICE CODE CODE PRIX ISBN 978-2-83220-258-6
BASIC SAFETY PUBLICATION PUBLICATION FONDAMENTALE DE SÉCURITÉ
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale ®
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé. SIST EN 60695-11-3:2012
– 2 – 60695-11-3 © IEC:2012 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 7 2 Normative references . 7 3 Terms and definitions . 8 4 Method A – Production of a standardized 500 W nominal test flame based on existing hardware . 8 4.1 Requirements . 8 4.2 Apparatus and fuel . 8 4.2.1 Burner . 8 4.2.2 Flowmeter . 8 4.2.3 Manometer . 9 4.2.4 Control valve . 9 4.2.5 Copper block . 9 4.2.6 Thermocouple. 9 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 . 10 4.4 Confirmation of the test flame . 10 4.4.1 Principle . 10 4.4.2 Procedure . 10 4.4.3 Verification . 11 5 Method C – Production of a standardized 500 W nominal test flame based on non-adjustable hardware . 11 5.1 Requirements . 11 5.2 Apparatus and fuel . 11 5.2.1 Burner . 11 5.2.2 Flowmeters . 11 5.2.3 Manometers . 12 5.2.4 Control valves . 12 5.2.5 Copper block . 12 5.2.6 Thermocouple. 12 5.2.7 Temperature/time indicating/recording devices . 12 5.2.8 Fuel gas . 12 5.2.9 Air supply . 12 5.2.10 Laboratory fumehood/chamber . 13 5.3 Production of the test flame . 13 5.4 Confirmation of the test flame . 13 5.4.1 Principle . 13 5.4.2 Procedure . 13 5.4.3 Verification . 14 6 Classification and designation . 14 Annex A (normative)
Test arrangements – Method A . 17 Annex B (normative)
Test arrangement – Method C . 21 SIST EN 60695-11-3:2012
60695-11-3 © IEC:2012 – 3 – Annex C (informative)
Recommended arrangements for the use of either of the test flames . 26 Annex D (informative) Test arrangements for tests on equipment . 27 Annex E (informative)
Test arrangements for tests on material . 28 Bibliography . 29
Figure 1 – Flame dimensions . 15 Figure 2 – Copper block . 15 Figure 3 – Flame height gauge . 16 Figure A.1 – General assembly and details . 18 Figure A.2 – Supply arrangement for burner (example) . 19 Figure A.3 – Confirmatory test arrangement . 20 Figure B.1 – Burner, method C – General assembly . 21 Figure B.2 – Burner details – Burner barrel, O-ring, air manifold and air supply tube. 22 Figure B.3 – Burner details – Gas supply tube and gas jet . 23 Figure B.4 – Burner details – Burner base and elbow block. 23 Figure B.5 – Supply arrangement for burner (example) . 24 Figure B.6 – Confirmatory test arrangement . 25 Figure D.1 – Examples of test arrangements . 27 Figure E.1 – Examples of test arrangements . 28
SIST EN 60695-11-3:2012
– 4 – 60695-11-3 © IEC:2012 INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
FIRE HAZARD TESTING –
Part 11-3: Test flames – 500 W flames –
Apparatus and confirmational test methods
FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60695-11-3 has been prepared by IEC technical committee 89: Fire hazard testing. This first edition of IEC 60695-11-3 cancels and replaces the second edition of IEC/TS 60695-11-3 published in 2004. It constitutes a technical revision and now has the status of an International Standard. It has the status of a basic safety publication in accordance with IEC Guide 104 and ISO/IEC Guide 51. The main changes with respect to the previous edition are the integration of minor editorial and technical changes throughout the text. SIST EN 60695-11-3:2012
60695-11-3 © IEC:2012 – 5 – The text of this standard is based on the following documents: FDIS Report on voting 89/1113/FDIS 89/1117/RVD
Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all the parts in the IEC 60695 series, under the general title Fire hazard testing, can be found on the IEC website. IEC 60695-11 consists of the following parts: Part 11-2: Test flames – 1 kW nominal pre-mixed flame – Apparatus, confirmatory test arrangement and guidance Part 11-3: Test flames – 500 W flames – Apparatus and confirmational test methods Part 11-4: Test flames – 50 W flame – Apparatus and confirmational test method Part 11-5: Test flames – Needle-flame test method – Apparatus, confirmatory test arrangement and guidance Part 11-10: Test flames – 50 W horizontal and vertical flame test methods Part 11-11: Test flames – Determination of the characteristic heat flux for ignition from a non-contacting flame source Part 11-20: Test flames – 500 W flame test methods Part 11-30: Test flames – History and development from 1979 to 1999 Part 11-40: Test flames – Confirmatory tests – Guidance The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the publication will be
• reconfirmed, • withdrawn, • replaced by a revised edition, or • amended.
SIST EN 60695-11-3:2012
– 6 – 60695-11-3 © IEC:2012 INTRODUCTION The best method for testing electrotechnical products with 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 effects 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, a 50 W flame is described in 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 either of two 500 W test flames, and also provides a description of a calibration procedure to check that the test flame produced meets given requirements. Guidance on confirmatory tests for test flames is given in IEC 60695-11-40. Four 500 W test flame methods were originally specified in Edition 1 of IEC/TS 60695-11-3, with the intention that users would determine a ranking preference. This process has resulted in two of these flame methods, B and D, being withdrawn, as shown below:
500 W test flame method Flame type Gas Approximate flame height / mm A Pre-mixed Methane 125 B Withdrawn C Pre-mixed Methane or propane 125 D Withdrawn
Method A was first published in 1994 and was based on existing hardware. 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. Method C is based on non-adjustable hardware that has been specifically developed to produce a highly repeatable and stable test flame. The flame is produced by burning either methane or propane. Both methods have been developed as technical enhancements of previous technology.
SIST EN 60695-11-3:2012
60695-11-3 © IEC:2012 – 7 – FIRE HAZARD TESTING –
Part 11-3: Test flames – 500 W flames –
Apparatus and confirmational test methods
1 Scope This part of IEC 60695-11 provides detailed requirements for the production of either of two 500 W nominal, pre-mixed type test flames. The approximate overall height of each flame is 125 mm. Two methods of producing a test flame are described: Method A uses methane. Method C can use either methane or propane. This basic safety publication is intended for use by technical committees in the preparation of standards in accordance with the principles laid 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 apply unless specifically referred to or included in the relevant publications. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60584-1:1995, Thermocouples – Part 1: Reference tables IEC 60584-2 am.1 ed.1:1989, Amendment 1, Thermocouples – Part 2: Tolerances
IEC Guide 104:1997, The preparation of safety publications and the use of basic safety publications and group safety publications 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 SIST EN 60695-11-3:2012
– 8 – 60695-11-3 © IEC:2012 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO/IEC 13945, as well as the following definition apply. 3.1
standardized 500 W nominal test flame test flame that conforms to this international standard and meets all of the requirements given in Clause 4 and Clause 6
4 Method A – Production of a standardized 500 W nominal test flame based on existing hardware 4.1 Requirements A standardized 500 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 965 ml/min
30 ml/min at 23 °C, 0,1 MPa 1, and at a back pressure of 125 mm
5 mm water, using the arrangements of Figure A.2. The flame shall be symmetrical, stable and give a result of 54 s
2 s in the confirmatory test described in 4.4. The confirmatory test arrangement shown in Figure A.3 shall be used. The approximate dimensions of the flame (see Figure 1), when measured in the laboratory fumehood/chamber using the gauge as described in Figure 3, should be: – height of inner blue cone: 40 mm; – overall height of flame: 125 mm. 4.2 Apparatus and fuel 4.2.1 Burner The burner shall be in accordance with Figure A.1. 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 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 the gas flow rate of 965 ml/min at 23 °C, 0,1 MPa1 to a tolerance of
2 %. NOTE A mass flowmeter is the preferred means of controlling accurately the input flow rate of fuel to the burner. Other methods may be used if they can show equivalent accuracy. ___________ 1 When corrected from the measurements taken under actual conditions of use. SIST EN 60695-11-3:2012
60695-11-3 © IEC:2012 – 9 – 4.2.3 Manometer The manometer shall be appropriate for the measurement of pressure in the range of 0 kPa to 7,5 kPa. A water manometer may be used for this purpose. It should be adapted to 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 9 mm in diameter, of mass 10,00 g
0,05 g in the fully machined but undrilled state as shown in Figure 2. 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 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 as defined in IEC 60584-2. It shall have an overall nominal diameter of 0,5 mm and wires of, for example, NiCr and NiAl (type K as defined in IEC 60584-1) with the welded point located inside the sheath. The sheath shall consist of a metal resistant to continuous operation at a temperature of at least 1 050 °C. Thermocouple tolerances shall be in accordance with IEC 60584-2, Class 1. NOTE A sheath made from a nickel-based, heat resistant alloy (such as Inconel 600 2) will satisfy the above requirements. The preferred method of fastening the thermocouple to the copper block, after first ensuring that the thermocouple is inserted to the full depth of the hole, is by compressing the copper around the thermocouple to retain it without damage, as shown in Figure A.3. 4.2.7 Temperature/time indicating/recording devices The temperature/time indicating/recording devices shall be appropriate for the measurement of the time for the copper block to heat up from 100 °C
2 °C to 700 °C
3 °C with a tolerance on the measured time of
0,5 s. 4.2.8 Fuel gas The fuel gas shall be methane with a purity of not less than 98 %. 4.2.9 Laboratory fumehood/chamber The laboratory fumehood/chamber shall have an inside volume of at least 0,75 m3. The chamber shall permit observation of tests in progress and shall provide a draught-free environment, whilst allowing normal thermal circulation of air past the test specimen during burning. The inside surfaces of the walls shall be of a dark colour. When a lux meter, facing ___________ 2
This information is given for the convenience of users of this international standard and does not constitute an endorsement by the IEC of the product named. Equivalent products may be used if they can be shown to lead to the same results. SIST EN 60695-11-3:2012
– 10 – 60695-11-3 © IEC:2012 towards the rear of the chamber, is positioned in place of the test flame, the recorded light level shall be less than 20 lx. For safety and convenience, it is desirable that this enclosure (which can be completely closed) is fitted with an extraction device, such as an exhaust fan, to remove products of combustion which may be toxic. If fitted, the extraction device shall be turned off during the test and turned on immediately after the test to remove the fire effluents. A positive closing damper may be needed. NOTE 1 The amount of oxygen available to support combustion of the test specimen is naturally important for the conduct of flame tests. For tests conducted by this method when burning times are prolonged, chambers having an inside volume of 0,75 m3 may not be sufficient to produce accurate results. NOTE 2 Placing a mirror in the chamber, to provide a rear view of the test specimen, has been found useful. 4.3 Production of the test flame Set up the burner supply arrangement according to Figure A.2 ensuring leak-free connections and place the burner in the laboratory fumehood/chamber. Ignite the gas and adjust the gas flow and back pressure to the required values. The air inlet shall be adjusted until the height of the inner blue cone is approximately 40 mm when measured using the gauge described in Figure 3, and then locked in position with the lock nut. The flame shall appear stable and symmetrical on examination. 4.4
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