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HORIZONTAL PUBLICATION PUBLICATION HORIZONTALE
Fire hazard testing –
Part 2-10: Glowing/hot-wire based test methods – Glow-wire apparatus and common test procedure
IEC 60695-2-10:2021-10(en-fr)
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HORIZONTAL PUBLICATION PUBLICATION HORIZONTALE
Fire hazard testing –
Part 2-10: Glowing/hot-wire based test methods – Glow-wire apparatus and common test procedure
INTERNATIONAL ELECTROTECHNICAL COMMISSION
COMMISSION ELECTROTECHNIQUE INTERNATIONALE
ICS 13.220.40; 29.020 ISBN 978-2-8322-1010-9
® Registered trademark of the International Electrotechnical Commission Marque déposée de la Commission Electrotechnique Internationale
CONTENTS
Terms and definitions 8
Description of the test apparatus 10
Glow-wire 10
Electrical circuit of the glow-wire apparatus 11
Temperature measuring system 12
Specified layer 13
Test chamber 14
Timing device 14
Verification of the apparatus 15
Verification of the glow-wire tip 15
Verification of the temperature measuring system 15
Conditioning 15
Common test procedure 15
Test specimen support 15
Glow-wire temperature 16
Application of the glow-wire 16
General test observations and evaluations of test results 16
Annex A (normative) Requirements for "ignition" and "flaming" observations 17
General 17
Examples of ignition and non-ignition 17
Annex B (informative) Guidance on the verification procedure of the glow-wire
temperature measuring system by the heating current 19
Objective 19
Preparation 19
Verification procedure 19
Observation and measurement 19
Correlation chart 19
Frequency of revising the correlation chart 20
Annex C (informative) Supplement – Times and durations, and examples of
evaluations 21
Times and durations (in accordance with Clause 3) 21
Examples of evaluations 21
Bibliography 23
Figure 1 – Glow-wire and position of thermocouple 11
Figure 2 – Electrical circuit of the glow-wire apparatus 12
Figure 3 – Test apparatus examples 14
Figure A.1 – Example of a brightly shining flame 17
Figure A.2 – Example of a blue corona at the glow-wire tip 18
Figure A.3 – Example of ionized gases in the form of a tail near the glow wire tip 18
Figure B.1 – Correlation curve between the heating current and the glow-wire
temperature (example) 20
Figure C.1 – Times and durations (Example: ignition occurs at 5 s and extinguishing
occurs at 50 s) 21
Figure C.2 – Evaluation scheme with examples 22
INTERNATIONAL ELECTROTECHNICAL COMMISSION
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.
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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.
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.
IEC 60695-2-10 has been prepared by IEC technical committee 89: Fire hazard testing. It is an International Standard.
This third edition cancels and replaces the second edition published in 2013. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
New terms and definitions with regards to times and durations have been added to Clause 3.
Previous Annex A of Equipment manufacturers and suppliers has been deleted.
Annex A (previous Annex B) for ignition and flaming observations has been changed from informative to normative.
New Annex C has been added, which visualizes times and durations, and gives examples for the behaviour of specimens, and how to evaluate them.
The text of this International Standard is based on the following documents:
FDIS | Report on voting |
89/1535/FDIS | 89/1547/RVD |
Full information on the voting for its approval can be found in the report on voting indicated in the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are described in greater detail at www.iec.ch/standardsdev/publications.
It has the status of a basic safety publication in accordance with IEC Guide 104.
This standard is to be used in conjunction with IEC 60695-2-11, IEC 60695-2-12, and IEC 60695-2-13.
A list of all parts in the IEC 60695 series, published under the general title Fire hazard testing, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the stability date indicated on the IEC website under webstore.iec.ch in the data related to the specific document. At this date, the document will be
reconfirmed,
withdrawn,
replaced by a revised edition, or
amended.
In the design of any electrotechnical product, the risk of fire and the potential hazards associated with fire need to be considered. In this respect the objective of component, circuit, and product design, as well as the choice of materials, is to reduce to acceptable levels the potential risks of fire during normal operating conditions, reasonably foreseeable abnormal use, malfunction, and/or failure. IEC 60695-1-10 [1] 1 was developed, together with its companion, IEC 60695-1-11 [2], to provide guidance on how this is to be accomplished.
The primary aims of IEC 60695-1-10 and IEC 60695-1-11 are to provide guidance on how:
to prevent ignition caused by an electrically energized component part; and
to confine any resulting fire within the bounds of the enclosure of the electrotechnical product in the event of ignition.
Secondary aims of these documents include the minimization of any flame spread beyond the product’s enclosure and the minimization of harmful effects of fire effluents such as heat, smoke, toxicity and/or corrosivity.
Fires involving electrotechnical products can also be initiated from external non-electrical sources. Considerations of this nature should be dealt with in the overall fire risk assessment.
In electrotechnical equipment, overheated metal parts can act as ignition sources. In glow-wire tests, a glowing wire is used to simulate such an ignition source.
This part of IEC 60695 gives recommendations with regard to the glow-wire test apparatus and describes a common test procedure for tests applicable to end products and materials to be used with IEC 60695-2-11 which describes a glow-wire flammability test for end products (GWEPT), IEC 60695-2-12 which describes a glow-wire flammability index test for materials (GWFI), and IEC 60695-2-13 which describes a glow-wire ignition temperature test method for materials (GWIT).
1 Numbers in square brackets refer to the Bibliography.
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.
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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.
IEC 60584-1, Thermocouples – Part 1: EMF specifications and tolerances
IEC 60695-2-11, Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods – Glow-wire flammability test method for end-products (GWEPT)
IEC 60695-2-12, Fire hazard testing – Part 2-12: Glowing/hot-wire based test methods – Glow-wire flammability index (GWFI) test method for materials
IEC 60695-2-13, Fire hazard testing – Part 2-13: Glowing/hot-wire based test methods – Glow-wire ignition temperature (GWIT) test method for materials
ISO 4046-4:2016, Paper, board, pulps and related terms – Vocabulary – Part 4: Paper and board grades and converted products
ISO 13943:2017, Fire safety – Vocabulary