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.<\/p>\n
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| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Annex ZA (normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 4 Principle of the test 5 Apparatus 5.1 Test arrangement <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | Figures Figure 1 \u2013 Arrangement and position of test specimen and burner <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 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 \u2013 Heat flux meter mounting board <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.6 Masking board 5.7 Timing device 5.8 Conditioning chamber 5.9 Test specimen support 5.10 Burner support Figure 3 \u2013 Structure of the masking board <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 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 \u2013 Heat flux meter supporting device <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 8.2 Determination of ignition time <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 9.3 Analysis on CHFI (optional) 10 Precision data 11 Test report <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 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 \u2013 Calibration curve (example) <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Tables Table A.1 \u2013 Calibration data (examples of actual measured data as shown in Figure A.1) Table A.2 \u2013 Calibration data (examples of interpolated values) <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | Annex B (informative)Examples of ignition times with various materials of 3 mm thickness B.1 Materials \u2013 Examples of measurements Figure B.1 \u2013 Example of ignition times of PMMA Table B.1 \u2013 Value of Figure B.1 <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Figure B.2 \u2013 Ignition times for ABS (example) Figure B.3 \u2013 Ignition times for HIPS (example) Table B.2 \u2013 Value of Figure B.2 <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | Table B.3 \u2013 Value of Figure B.3 Table B.4 \u2013 Description example of tabulated test results <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Annex C (informative)Precision data C.1 General C.2 Heat flux versus distance at different gas flow rates Figure C.1 \u2013 Incident heat flux calibration curve (gas flow rate 105 cm3\/min) <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | C.3 Repeatability Figure C.2 \u2013 Incident heat flux calibration curve (gas flow rate 160 cm3\/min) <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | C.4 Calculations and plots Table C.1 \u2013 Precision data of ignition time <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Figure C.3 \u2013 Plot of 1\/ tig for material A Figure C.4 \u2013 Plot of 1\/tig for material B <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Figure C.5 \u2013 Plot of 1\/ tig for material C Figure C.6 \u2013 Plot of 1\/ tig for material D <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Annex D (informative)Method of positioning the heat flux meter D.1 General D.2 Positioning the heat flux meter Figure D.1 \u2013 Positioning the heat flux meter <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Figure D.2 \u2013 Correct position of the test specimen support and the heat flux meter <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Fire hazard testing – Test flames. Determination of the characteristic heat flux for ignition from a non-contacting flame source<\/b><\/p>\n |