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BS EN IEC 60695-11-11:2021

BS EN IEC 60695-11-11:2021

$167.15

Fire hazard testing – Test flames. Determination of the characteristic heat flux for ignition from a non-contacting flame source

Published By Publication Date Number of Pages
BSI 2021 36
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IEC 60695-11-11:2021 describes a test method used to determine the characteristic heat flux for ignition (CHFI) from a non-contacting flame source for materials used in electrotechnical products, sub-assemblies or their parts. It provides a relationship between ignition time and incident heat flux. A test specimen cut from an end-product or sub-assembly can be tested by this test method. This part of IEC 60695 can be used in the fire hazard assessment and fire safety engineering procedures described in IEC 60695-1-10, IEC 60695-1-11 and IEC 60695-1-12. 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. This international standard is to be used in conjunction with IEC 60695-11-4. It has the status of a basic safety publication in accordance with IEC Guide 104 and ISO/IEC Guide 51.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
7 CONTENTS
9 FOREWORD
11 INTRODUCTION
12 1 Scope
2 Normative references
13 3 Terms and definitions
14 4 Principle of the test
5 Apparatus
5.1 Test arrangement
15 Figures
Figure 1 ā€“ Arrangement and position of test specimen and burner
16 5.2 Burner and test flame
5.3 Heat flux meter
5.4 Data acquisition system
5.5 Heat flux meter mounting board
Figure 2 ā€“ Heat flux meter mounting board
17 5.6 Masking board
5.7 Timing device
5.8 Conditioning chamber
5.9 Test specimen support
5.10 Burner support
Figure 3 ā€“ Structure of the masking board
18 5.11 Observation mirror
5.12 Flow controller
5.13 Heat flux meter supporting device
6 Test specimen
6.1 Dimensions of test specimen
Figure 4 ā€“ Heat flux meter supporting device
19 6.2 Testing ranges in formulations
6.2.1 General
6.2.2 Density, melt flows and filler/reinforcement
6.2.3 Colour
6.3 Conditioning of test specimens
7 Testing conditions
8 Test procedure
8.1 Determination of incident heat flux calibration curve
20 8.2 Determination of ignition time
21 8.3 Repetition of the test at different heat flux values
9 Evaluation of test results
9.1 Average ignition time tig
9.2 Report format for CHFI
22 9.3 Analysis on CHFI (optional)
10 Precision data
11 Test report
23 Annex A (informative)An example of the calibration curve of incident heat flux, Q,versus the distance, D, between the top of the burner tubeand the lower surface of the test specimen
A.1 Calibration curve
Figure A.1 ā€“ Calibration curve (example)
24 Tables
Table A.1 ā€“ Calibration data (examples of actual measured data as shown in Figure A.1)
Table A.2 ā€“ Calibration data (examples of interpolated values)
25 Annex B (informative)Examples of ignition times with various materials of 3 mm thickness
B.1 Materials ā€“ Examples of measurements
Figure B.1 ā€“ Example of ignition times of PMMA
Table B.1 ā€“ Value of Figure B.1
26 Figure B.2 ā€“ Ignition times for ABS (example)
Figure B.3 ā€“ Ignition times for HIPS (example)
Table B.2 ā€“ Value of Figure B.2
27 Table B.3 ā€“ Value of Figure B.3
Table B.4 ā€“ Description example of tabulated test results
28 Annex C (informative)Precision data
C.1 General
C.2 Heat flux versus distance at different gas flow rates
Figure C.1 ā€“ Incident heat flux calibration curve (gas flow rate 105 cm3/min)
29 C.3 Repeatability
Figure C.2 ā€“ Incident heat flux calibration curve (gas flow rate 160 cm3/min)
30 C.4 Calculations and plots
Table C.1 ā€“ Precision data of ignition time
31 Figure C.3 ā€“ Plot of 1/ tig for material A
Figure C.4 ā€“ Plot of 1/tig for material B
32 Figure C.5 ā€“ Plot of 1/ tig for material C
Figure C.6 ā€“ Plot of 1/ tig for material D
33 Annex D (informative)Method of positioning the heat flux meter
D.1 General
D.2 Positioning the heat flux meter
Figure D.1 ā€“ Positioning the heat flux meter
34 Figure D.2 ā€“ Correct position of the test specimen support and the heat flux meter
35 Bibliography

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BS EN IEC 60695-11-11:2021
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