BS EN 50399-2011 Common test methods for cables under fire conditions Heat release and smoke production measurement on cables during flame spread test Test apparatus procedures res.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 50399:2011Common test methods for cables under fire conditions Heat release and smoke production measurement on cables during flame spread test Test apparatus, procedures,

2、resultsLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/08/2011 08:25, Uncontrolled Copy, (c) BSIBS EN 50399:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 50399:2011. The UK participation in its preparation was entrusted to TechnicalCommittee GEL

3、/20/18, Electric Cables - Fire testing.A list of organizations represented on this committee can be obtained on 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. BSI 2011 ISBN 978 0 580

4、 53922 0 ICS 13.220.40; 29.060.20 Compliance with 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 31 May 2011.Amendments issued since publicationDate T e x t a f f e c t e dLice

5、nsed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/08/2011 08:25, Uncontrolled Copy, (c) BSIBS EN 50399:2011EUROPEAN STANDARD EN 50399 NORME EUROPENNE EUROPISCHE NORM April 2011 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europis

6、ches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50399:2011 E ICS 13.220.40; 29.060.20 English version Common test methods for ca

7、bles under fire conditions - Heat release and smoke production measurement on cables during flame spread test - Test apparatus, procedures, results Mthodes dessai communes aux cbles soumis au feu - Mesure de la chaleur et de la fume dgages par les cbles au cours de lessai de propagation de la flamme

8、 - Appareillage dessai, procdure et rsultats Allgemeine Prfverfahren fr das Verhalten von Kabeln und isolierten Leitungen im Brandfall - Messung der Wrmefreisetzung und Raucherzeugung whrend der Prfung der Flammenausbreitung - Prfeinrichtung, Prfverfahren und Prfergebnis This European Standard was a

9、pproved by CENELEC on 2011-02-28. 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 n

10、ational 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 lang

11、uage and notified to the Central Secretariat 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, Germany, Greece, Hungary, Iceland, Ireland, I

12、taly, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/08/2011 08:25, Uncontrolled Copy, (c) BSIBS EN 50399:2011EN 50399:2011 2 Fo

13、reword This European Standard was prepared by the Technical Committee CENELEC TC 20, Electric cables. The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50399 on 2011-02-28. The following dates were fixed: latest date by which the EN has to be implemented at nat

14、ional level by publication of an identical national standard or by endorsement (dop) 2012-02-28 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2014-02-28 _ Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/08/2011 08:25, Uncontrolled Copy, (c)

15、BSIBS EN 50399:2011 3 EN 50399:2011 Contents Introduction . 51 Scope 72 Normative references 73 Terms and definitions . 74 Test apparatus . 84.1 General 84.2 Air input . 94.3 Hood 94.4 Exhaust duct 104.5 Instrumentation in the exhaust duct 104.6 Extracting ventilator . 114.7 Smoke production measuri

16、ng equipment . 114.8 Combustion gas analysis equipment 125 Qualification of test apparatus . 125.1 General 125.2 Flow distribution measurements . 125.3 Sampling delay time measurement . 135.4 Commissioning calibrations 135.5 Routine calibration . 136 Test procedure. 146.1 Initial test conditions 146

17、.2 Test sample . 146.3 Sample conditioning 146.4 Determination of the number of test pieces 156.5 Mounting of the test sample 166.6 Exhaust volume flow . 176.7 Ignition source . 176.8 Flame application time 176.9 Testing operations . 186.10 Observations and measurements during the test . 187 Determi

18、nation of parameters derived from the test . 197.1 Calculation of HRR and SPR parameters . 197.2 Determination of extent of flame spread (FS) 198 Test report 208.1 General 208.2 Contents 20Annex A (normative) Calculation of heat release . 31A.1 Volume flow . 31A.2 Generated heat effect . 31A.3 Calcu

19、lation of the mole fraction of water vapour in the air 33Annex B (normative) Smoke production . 34Annex C (informative) Additional information on Reynolds number in Figure 5 35Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/08/2011 08:25, Uncontrolled Copy, (c) BSIBS EN 50399:2011EN 50399:

20、2011 4 Annex D (normative) Flow distribution inside the duct . 36D.1 General 36D.2 Velocity profile factor kc. 36Annex E (normative) Commissioning calibrations 39E.1 General procedures for separate pieces of equipment . 39E.2 Gas analyser calibrations 39E.3 HRR calibrations 40E.4 Smoke measurement s

21、ystem calibration 44Annex F (informative) Guidance for calibration procedures for specific measuring equipment 47F.1 General procedures for separate pieces of equipment . 47F.2 Gas analyser calibrations 47F.3 Check of propane mass flow controller or rotameter 47F.4 Optical filter check for white lig

22、ht systems 48Annex G (normative) Calculation of HRRav, SPRavand FIGRA . 49G.1 Calculation of HRRav49G.2 Calculation of SPRav. 50G.3 Calculation of the Fire Growth Rate Index (FIGRA) 50Annex H (informative) Guidance on the choice of test equipment . 51Annex I (informative) Guidance on the file format

23、 for data from the test 52Bibliography 56Figures Figure 1 General arrangement of test apparatus . 22Figure 2 Schematic of a hood 23Figure 3 Typical guide vanes . 24Figure 4 Bidirectional probe . 25Figure 5 Probe response versus Reynolds number . 26Figure 6 Sampling probe 27Figure 7 Schematic diagram

24、 of sampling line 28Figure 8 Optical system General arrangement . 29Figure 9 Mounting arrangement for Class B1ca30Figure D.1 Section of the exhaust duct Positions for measurement of the gas velocity . 37Figure E.1 Overview of commissioning calibrations . 46Tables Table 1 Mounting as a function of ca

25、ble diameter . 17Table E.1 Burner ignition times and HRR levels . 41Table E.2 Example of determination of commissioning ktfactor 43Table I.1 - Example of the recommended raw data file format . 53Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/08/2011 08:25, Uncontrolled Copy, (c) BSIBS EN

26、50399:2011 5 EN 50399:2011 Introduction EN 50399 specifies the test apparatus and test procedures for the assessment of the reaction to fire performance of cables to enable classification under the Construction Products Directive 1 to be achieved. The test method describes an intermediate scale fire

27、 test of multiple cables mounted on a vertical cable ladder and is carried out with a specified ignition source to evaluate the burning behaviour of such cables and enable a direct declaration of performance. The test provides data for the early stages of a cable fire from ignition of cables. It add

28、resses the hazard of propagation of flames along the cable, the potential, by the measurement of the heat release rate, for the fire to affect areas adjacent to the compartment of origin, and the hazard, by the measurement of production of light obstructing smoke, of reduced visibility in the room o

29、f origin and surrounding enclosures. The following parameters may be determined under defined conditions during the test: a) flame spread; b) heat release rate; c) total heat release; d) smoke production rate; e) total smoke production; f) fire growth rate index; g) occurrence of flaming droplets/pa

30、rticles . The apparatus is based upon that of EN 60332-3-10 but with additional instrumentation to measure heat release and smoke production during the test. It has been demonstrated 3 that the utilisation of these additional measurement techniques, proven for other standard tests, e.g. for building

31、 products, are appropriate for assessing the reaction to fire performance of electric cables. These techniques include heat release and smoke production measurements. Compared with existing test methods described in EN 60332-3-10, they enable a more comprehensive assessment system, which is both mor

32、e precise and sensitive, and enables a wider range of fire performance levels. Care should be exercised in relating the parameters measured to different safety levels in actual cable installations as the actual installed configuration of the cables may be a major determinant in the level of flame sp

33、read, heat release and smoke production occurring in an actual fire. These parameters depend upon a number of features, such as a) the volume of combustible material exposed to the fire and to any flaming or heat which may be produced by the combustion of the cables; b) the geometrical configuration

34、 of the cables and their relationship to an enclosure; c) the temperature at which it is possible to ignite the gases emitted from the cables; d) the quantity of combustible gas released from the cables for a given temperature rise; e) the volume of air passing through the cable installation; f) the

35、 construction of the cable, e.g. armoured or unarmoured, multi or single core. All of the foregoing assumes that the cables are able to be ignited when involved in an external fire. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/08/2011 08:25, Uncontrolled Copy, (c) BSIBS EN 50399:2011EN

36、50399:2011 6 The conditions of cable mounting, including volume of material exposed and geometrical configuration of the cables on the test ladder, and volume of airflow through the chamber have been chosen to be in accordance with that required by the Commission Decision 2006/751/EC 2. CENELEC has

37、not been involved in the definition of these parameters. These standardised conditions provide the basis for classification but do not necessarily correspond to conditions found in a particular cable installation. NOTE Further information on the use of standardised conditions for classification with

38、 respect to product end-use application may be found in European Commission Guidance Paper G 4. EN 50399 gives details of the apparatus to be used in conjunction with the equipment described in EN 60332-3-10 in order to carry out the measurement of heat release and smoke production during the test.

39、Details of the test procedures are also given. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/08/2011 08:25, Uncontrolled Copy, (c) BSIBS EN 50399:2011 7 EN 50399:2011 1 Scope EN 50399 specifies the apparatus and methods of test for the assessment of vertical flame spread, heat release, s

40、moke production and occurrence of flaming droplets/particles of vertically-mounted bunched wires or cables, electrical or optical, under defined conditions. NOTE For the purpose of this standard the term “electric wire or cable“ covers all insulated metallic conductor cables used for the conveyance

41、of energy or signals. EN 50399 details the apparatus and the arrangement and calibration of the instrumentation to be installed in order to measure the heat release and the smoke production during the test. The combustion gases are collected in a hood above the test chamber and conveyed through an e

42、xhaust system, which allows the measurement of heat release rate and smoke production. Test procedures to be used for type approval testing for classification of cables in Euroclasses B1ca, B2ca, Ccaand Dcaare given. Cable installation on the test ladder and the volume of air passing through the cha

43、mber are in accordance with the Commission Decision 2006/751/EC 2 which is reflected in the requirements of this standard. The apparatus described in this standard shall be used in conjunction with that described in EN 60332-3-10. 2 Normative references The following referenced documents are indispe

44、nsable 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. EN 60332-3-10, Tests on electric and optical fibre cables under fire conditions Part 3-10: Test

45、 for vertical flame spread of vertically-mounted bunched wires or cables Apparatus (IEC 60332-3-10) EN 60584-1, Thermocouples Part 1: Reference tables (IEC 60584-1) EN ISO 13943:2010, -Fire safety Vocabulary (ISO 13943:2008) ISO 3966, Measurement of fluid flow in closed conduits Velocity area method

46、 using Pitot static tubes 3 Terms and definitions For the purpose of this document, the terms and definitions given in EN ISO 13943:2010 and the following apply. 3.1 heat release rate HRR thermal energy released per unit time by an item during combustion under specified conditions 3.2 total heat rel

47、ease THR integrated value of the heat release rate over a defined period 3.3 smoke production rate SPR smoke production per unit time Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/08/2011 08:25, Uncontrolled Copy, (c) BSIBS EN 50399:2011EN 50399:2011 8 3.4 total smoke production TSP inte

48、grated value of the smoke production rate over a defined period 3.5 flame spread FS propagation of a flame front NOTE In this standard the extent of flame spread is determined as the extent of damage measured by the onset of char. 3.6 fire growth rate index FIGRA highest value of the quotient between HRR and time NOTE 1 In this standard FIGRA is expressed in W/s. NOTE 2 Details of the calculation of FIGRA are given in Annex G. 3.7 flaming droplets/particles material separating from the specimen during the test a