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BS EN IEC 60695-2-10:2021:2022 Edition

BS EN IEC 60695-2-10:2021:2022 Edition

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Fire hazard testing – Glowing/hot-wire based test methods. Glow-wire apparatus and common test procedure

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BSI 2022 36
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This part of IEC 60695 specifies the glow-wire apparatus and common test procedure to simulate the effects of thermal stresses which may be produced by heat sources such as glowing elements or overloaded resistors, for short periods, in order to assess the fire hazard by a simulation technique. The test procedure described in this document is a common test procedure intended for the small-scale tests in which a standardized electrically heated wire is used as a source of ignition. It is a common part of the test procedures applied to end products and to solid electrical insulating materials or other solid combustible materials. A detailed description of each particular test procedure is given in IEC 60695-2-11, IEC 60695-2-12 and IEC 60695-2-13. This basic safety publication focusing on safety test method(s) is primarily intended for use by technical committees in the preparation of safety publications 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.

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PDF Pages PDF Title
2 undefined
7 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
12 English
CONTENTS
14 FOREWORD
16 INTRODUCTION
17 1 Scope
2 Normative references
18 3 Terms and definitions
20 4 Description of the test apparatus
4.1 Glow-wire
21 4.2 Electrical circuit of the glow-wire apparatus
Figures
Figure 1 ā€“ Glow-wire and position of thermocouple
22 4.3 Temperature measuring system
Figure 2 ā€“ Electrical circuit of the glow-wire apparatus
23 4.4 Specified layer
24 4.5 Test chamber
4.6 Timing device
Figure 3 ā€“ Test apparatus examples
25 5 Verification of the apparatus
5.1 Verification of the glow-wire tip
5.2 Verification of the temperature measuring system
6 Conditioning
7 Common test procedure
7.1 Test specimen support
26 7.2 Glow-wire temperature
7.3 Application of the glow-wire
8 General test observations and evaluations of test results
27 Annex A (normative) Requirements for “ignition” and “flaming” observations
A.1 General
A.2 Examples of ignition and non-ignition
Figure A.1 ā€“ Example of a brightly shining flame
28 Figure A.2 ā€“ Example of a blue corona at the glow-wire tip
Figure A.3 ā€“ Example of ionized gases in the form of a tail near the glow wire tip
29 Annex B (informative) Guidance on the verification procedure of the glow-wire temperature measuring system by the heating current
B.1 Objective
B.2 Preparation
B.3 Verification procedure
B.3.1 Observation and measurement
B.3.2 Correlation chart
30 B.3.3 Frequency of revising the correlation chart
Figure B.1 ā€“ Correlation curve between the heating current and the glow-wire temperature (example)
31 Annex C (informative) Supplement ā€“ Times and durations, and examples of evaluations
C.1 Times and durations (in accordance with Clause 3)
C.2 Examples of evaluations
Figure C.1 ā€“ Times and durations(Example: ignition occurs at 5 s and extinguishing occurs at 50 s)
32 Figure C.2 ā€“ Evaluation scheme with examples
33 Bibliography

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