SIST EN IEC 60695-2-10:2022
(Main)Fire hazard testing - Part 2-10: Glowing/hot-wire based test methods - Glow-wire apparatus and common test procedure (IEC 60695-2-10:2021)
Fire hazard testing - Part 2-10: Glowing/hot-wire based test methods - Glow-wire apparatus and common test procedure (IEC 60695-2-10:2021)
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.
Prüfungen zur Beurteilung der Brandgefahr - Teil 2-10: Prüfverfahren mit dem Glühdraht - Glühdrahtprüfeinrichtung und allgemeines Prüfverfahren (IEC 60695-2-10:2021)
Essais relatifs aux risques du feu - Partie 2-10: Essais au fil incandescent/chauffant - Appareillage et méthode commune d'essai (IEC 60695-2-10:2021)
IEC 60695-2-10:2021 est disponible sous forme de IEC 60695-2-10:2021 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 60695-2-10:2021 spécifie l’appareillage et la méthode commune d’essai au fil incandescent pour simuler l’effet de contraintes thermiques qui peuvent être produites par des sources de chaleur telles que des éléments incandescents ou des résistances surchargées, sur de courtes durées, afin d’évaluer de façon simulée les dangers d’incendie. La méthode d’essai décrite dans le présent document représente une méthode commune d’essai destinée aux essais à petite échelle qui utilisent un fil normalisé chauffé électriquement comme source d’allumage. Il s’agit d’une partie commune des méthodes d’essai appliquées aux produits finis et aux matériaux isolants électriques solides ou à d'autres matériaux combustibles. Une description détaillée de chaque méthode d’essai particulière est donnée dans l’IEC 60695 2 11, l’IEC 60695 2 12 et l’IEC 60695-2-13. La présente publication fondamentale de sécurité, fondée sur la ou les méthodes d’essai de sécurité, est essentiellement destinée à être utilisée par les comités d’études dans le cadre de l’élaboration de publications de sécurité conformément aux principes établis dans le Guide IEC 104 et le Guide ISO/IEC 51. L'une des responsabilités d'un comité d'études consiste, le cas échéant, à utiliser les publications fondamentales de sécurité dans le cadre de l'élaboration de ses publications. Cette norme doit être utilisée conjointement avec l’IEC 60695-2-11, l’IEC 60695-2-12 et l’IEC 60695-2-13. Cette troisième édition annule et remplace la deuxième édition parue en 2013. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) De nouveaux termes et définitions concernant les moments et les durées ont été ajoutés à l'Article 3.
b) L'ancienne Annexe A relative aux fabricants et fournisseurs d'appareillage a été supprimée.
c) L'Annexe A (ancienne Annexe B) relative aux observations sur l'allumage et l’inflammation qui était informative est devenue normative.
d) Une nouvelle Annexe C qui donne une représentation des moments et des durées, ainsi que des exemples du comportement des éprouvettes d’essai, et de la manière de les évaluer a été ajoutée.
Preskušanje požarne ogroženosti - 2-10. del: Preskusne metode z žarilno žico - Aparat z žarilno žico in postopek splošnega preskusa (IEC 60695-2-10:2021)
Ta del standarda IEC 60695 opredeljuje aparat z žarilno žico in določa postopek splošnega preskusa za simulacijo učinkov toplotne preobremenitve, ki jih lahko ustvarijo žareči elementi ali preobremenjeni upori, v kratkih časovnih obdobjih, za ocenjevanje požarne ogroženosti s simulacijsko metodo.
Preskusni postopek, opisan v tem dokumentu, je postopek splošnega preskusa, namenjen za manjše preskuse, v katerih se kot vir vžiga uporabi standardizirana električna ogrevana žica.
Običajno se uporablja pri preskusnih postopkih za končne proizvode in za trdne električne izolacijske materiale ali druge trde gorljive materiale.
Podroben opis vseh posameznih preskusnih postopkov je podan v standardih IEC 60695-2-11, IEC 60695-2-12 in IEC 60695-2-13.
Ta osnovna varnostna publikacija, ki se osredotoča na varnostne preskusne metode, je namenjena predvsem tehničnim odborom za pripravo varnostnih publikacij v skladu z načeli vodil IEC 104 in ISO/IEC 51.
Ena od dolžnosti tehničnega odbora je, da med pripravo publikacij uporablja osnovne varnostne publikacije, kadar je to primerno.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN IEC 60695-2-10:2022
01-februar-2022
Nadomešča:
SIST EN 60695-2-10:2013
Preskušanje požarne ogroženosti - 2-10. del: Preskusne metode z žarilno žico -
Aparat z žarilno žico in postopek splošnega preskusa (IEC 60695-2-10:2021)
Fire hazard testing - Part 2-10: Glowing/hot-wire based test methods - Glow-wire
apparatus and common test procedure (IEC 60695-2-10:2021)
Prüfungen zur Beurteilung der Brandgefahr - Teil 2-10: Prüfverfahren mit dem Glühdraht
- Glühdrahtprüfeinrichtung und allgemeines Prüfverfahren (IEC 60695-2-10:2021)
Essais relatifs aux risques du feu - Partie 2-10: Essais au fil incandescent/chauffant -
Appareillage et méthode commune d'essai (IEC 60695-2-10:2021)
Ta slovenski standard je istoveten z: EN IEC 60695-2-10:2021
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
29.020 Elektrotehnika na splošno Electrical engineering in
general
SIST EN IEC 60695-2-10:2022 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN IEC 60695-2-10:2022
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SIST EN IEC 60695-2-10:2022
EUROPEAN STANDARD EN IEC 60695-2-10
NORME EUROPÉENNE
EUROPÄISCHE NORM December 2021
ICS 13.220.40; 29.020 Supersedes EN 60695-2-10:2013 and all of its
amendments and corrigenda (if any)
English Version
Fire hazard testing - Part 2-10: Glowing/hot-wire based test
methods - Glow-wire apparatus and common test procedure
(IEC 60695-2-10:2021)
Essais relatifs aux risques du feu - Partie 2-10: Essais au fil Prüfungen zur Beurteilung der Brandgefahr - Teil 2-10:
incandescent/chauffant - Appareillage et méthode Prüfverfahren mit dem Glühdraht - Glühdrahtprüfeinrichtung
commune d'essai und allgemeines Prüfverfahren
(IEC 60695-2-10:2021) (IEC 60695-2-10:2021)
This European Standard was approved by CENELEC on 2021-12-02. 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 national standards may be obtained on application to the CEN-CENELEC
Management Centre 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 language and notified to the CEN-CENELEC Management Centre 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, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60695-2-10:2021 E
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SIST EN IEC 60695-2-10:2022
EN IEC 60695-2-10:2021 (E)
European foreword
The text of document 89/1535/FDIS, future edition 3 of IEC 60695-2-10, prepared by IEC/TC 89 “Fire
hazard testing” was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN IEC 60695-2-10:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022–09–02
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024–12–02
document have to be withdrawn
This document supersedes EN 60695-2-10:2013 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60695-2-10:2021 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60695-1-10 NOTE Harmonized as EN 60695-1-10
IEC 60695-1-11 NOTE Harmonized as EN 60695-1-11
2
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EN IEC 60695-2-10:2021 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European 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.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60584-1 - Thermocouples - Part 1: EMF EN 60584-1 -
specifications and tolerances
IEC 60695-2-11 - Fire hazard testing - Part 2–11: EN IEC 60695-2-11 -
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: EN IEC 60695-2-12 -
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: EN IEC 60695-2-13 -
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 EN ISO 13943 2017
3
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SIST EN IEC 60695-2-10:2022
IEC 60695-2-10
®
Edition 3.0 2021-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
HORIZONTAL PUBLICATION
PUBLICATION HORIZONTALE
Fire hazard testing –
Part 2-10: Glowing/hot-wire based test methods – Glow-wire apparatus and
common test procedure
Essais relatifs aux risques du feu –
Partie 2-10: Essais au fil incandescent/chauffant – Appareillage et méthode
commune d’essai
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.220.40; 29.020 ISBN 978-2-8322-1010-9
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 60695-2-10:2022
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CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Description of the test apparatus . 10
4.1 Glow-wire. 10
4.2 Electrical circuit of the glow-wire apparatus . 11
4.3 Temperature measuring system . 12
4.4 Specified layer . 13
4.5 Test chamber . 14
4.6 Timing device . 14
5 Verification of the apparatus . 15
5.1 Verification of the glow-wire tip . 15
5.2 Verification of the temperature measuring system . 15
6 Conditioning . 15
7 Common test procedure . 15
7.1 Test specimen support . 15
7.2 Glow-wire temperature . 16
7.3 Application of the glow-wire . 16
8 General test observations and evaluations of test results . 16
Annex A (normative) Requirements for "ignition" and "flaming" observations . 17
A.1 General . 17
A.2 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
B.1 Objective . 19
B.2 Preparation . 19
B.3 Verification procedure . 19
B.3.1 Observation and measurement . 19
B.3.2 Correlation chart . 19
B.3.3 Frequency of revising the correlation chart . 20
Annex C (informative) Supplement – Times and durations, and examples of
evaluations . 21
C.1 Times and durations (in accordance with Clause 3) . 21
C.2 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
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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
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIRE HAZARD TESTING –
Part 2-10: Glowing/hot-wire based test methods –
Glow-wire apparatus and common test procedure
FOREWORD
1) 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.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) 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.
9) 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:
a) New terms and definitions with regards to times and durations have been added to Clause 3.
b) Previous Annex A of Equipment manufacturers and suppliers has been deleted.
c) Annex A (previous Annex B) for ignition and flaming observations has been changed from
informative to normative.
d) New Annex C has been added, which visualizes times and durations, and gives examples
for the behaviour of specimens, and how to evaluate them.
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IEC 60695-2-10:2021 © IEC 2021 – 5 –
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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.
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INTRODUCTION
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,
1
malfunction, and/or failure. IEC 60695-1-10 [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:
a) to prevent ignition caused by an electrically energized component part; and
b) 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.
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FIRE HAZARD TESTING –
Part 2-10: Glowing/hot-wire based test methods –
Glow-wire apparatus and common test procedure
1 Scope
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.
2 Normative references
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
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3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 13943:2017, some of
which are reproduced below for the user's convenience, and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
combustible, adjective
capable of being ignited and burned
[SOURCE: ISO 13943:2017, 3.52]
3.2
draught-free environment
space in which the results of experiments are not significantly affected by the local air speed
Note 1 to entry: A qualitative example is a space in which a wax candle flame remains essentially undisturbed.
−1 −1
Quantitative examples are small-scale fire tests in which a maximum air speed of 0,1 m·s or 0,2 m·s is sometimes
specified.
[SOURCE: ISO 13943:2017, 3.83]
3.3
fire hazard
potential for harm associated with fire
Note 1 to entry: Alternatively, fire hazard can be a physical object or condition with a potential for an undesirable
consequence from fire.
[SOURCE: ISO 13943:2017, 3.131]
3.4
fire test
test that measures fire behaviour or exposes an item to the effects of a fire
Note 1 to entry: The results of a fire test can be used to quantify fire severity or determine the fire resistance or
reaction to fire of the test specimen.
[SOURCE: ISO 13943:2017, 3.157]
3.5
flame, noun
rapid, self-sustaining, sub-sonic propagation of combustion in a gaseous medium, usually with
emission of light
[SOURCE: ISO 13943:2017, 3.159]
3.6
flame event
sustained flaming and/or glowing combustion
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3.7
flammability
ability of a material or product to burn with a flame under specified conditions
[SOURCE: ISO 13943:2017, 3.178]
3.8
ignition
DEPRECATED: sustained ignition
initiation of combustion
[SOURCE: ISO 13943:2017, 3.217]
3.9
test temperature
temperature to which the tip of the glow-wire is heated and stabilized prior to any contact with
the test specimen
3.10
time of application
t
APP
application time of the glow-wire
Note 1 to entry: Time of application constitutes the first 30 s of the test.
Note 2 to entry: t was originally designated as t in Editions 1 and 2 of IEC 60695-2.
APP A
Note 3 to entry: See Annex C.
3.11
time of observation
t
OBS
observation time of the specimen and/or specified layer, starting immediately after t
APP
Note 1 to entry: Time of observation constitutes the second 30 s of the test.
Note 2 to entry: See Annex C.
3.12
time of ignition
t
I
time (to the nearest 0,5 s), from the start of test, at which the longest persisting flame event
starts
Note 1 to entry: This is a measured value.
Note 2 to entry: See Annex C.
3.13
time of extinguishing
t
E
time (to the nearest 0,5 s), from the start of the test, at which the longest persisting flame event
ends
Note 1 to entry: This is a measured value.
Note 2 to entry: See Annex C.
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3.14
total flame event time
t
T
duration of the longest persisting flame event
t = t − t
T E I
Note 1 to entry: This is a calculated value.
Note 2 to entry: See Annex C.
3.15
flame time after removal
t
R
time elapsed after the removal of the glow-wire tip from the test specimen to the end of the
longest persisting flame event
t = t − 30 s
R E
Note 1 to entry: If t is less than 30 s then t is zero.
E R
Note 2 to entry: This is a calculated value.
Note 3 to entry: See Annex C.
3.16
flame time during application
t
B
duration of the longest persisting flame event whilst the glow-wire tip is in contact with the test
specimen
t = t − t
B T R
Note 1 to entry: This is a calculated value.
Note 2 to entry: See Annex C.
4 Description of the test apparatus
4.1 Glow-wire
The glow-wire is formed from nickel/chromium (> 77 % Ni/20 ± 1 % Cr) wire, having an overall
diameter of 4,00 mm ± 0,07 mm (before bending). The dimensions of the glow-wire loop are as
detailed in Figure 1. When forming the glow-wire, ensure that fine cracking at the tip is avoided.
NOTE Annealing is a suitable process for prevention of fine cracking at the tip.
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Dimensions in millimetres
Key
1 Glow-wire
2 Thermocouple
3 Stud
Dimension A (after bending): see 5.1.
Figure 1 – Glow-wire and position of thermocouple
A new glow-wire shall be annealed for a total of at least 10 h by being subjected to a current of
at least 120 A before being used for a test run. The total annealing time may be achieved
cumulatively. To avoid damage, the thermocouple shall not be installed during annealing. At
the end of annealing, the depth of the thermocouple pocket hole shall be verified.
NOTE 1 The temperature of a new glow-wire which has not been annealed gradually lowers during the first few
hours when subjected to a flow of current. After a period of time the temperature then reaches equilibrium.
The test apparatus shall be designed so that the glow-wire is kept in a horizontal plane and
applies a force
...
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