Fire hazard testing - Part 2-10: Glowing/hot-wire based test methods - Glow-wire apparatus and common test procedure

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 standard 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 the respective standards IEC 60695-2-11, IEC 60695-2-12 and IEC 60695-2-13. 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.

Prüfungen zur Beurteilung der Brandgefahr - Teil 2-10: Prüfungen mit dem Glühdraht - Glühdrahtprüfeinrichtungen und allgemeines Prüfverfahren

Essais relatifs aux risques du feu - Partie 2-10: Essais au fil incandescent/chauffant - Appareillage et méthode commune d'essai

La CEI 60695-2-10:2013 spécifie un appareil d'essai au fil incandescent et une procédure d'essai commune 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 risques du feu. La procédure d'essai décrite dans la présente norme représente une procédure d'essai commune 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 procédures d'essai appliquées aux produits finis et aux matériaux isolants électriques solides ou à d'autres matériaux combustibles. Une description détaillée de chaque procédure d'essai particulière est donnée dans la CEI 60695-2-11, la CEI 60695-2-12 et la CEI 60695-2-13. Cette deuxième édition de la CEI 60695-2-10 annule et remplace la première édition de la CEI 60695-2-10 publiée en 2000. Cette édition constitue une révision technique. Les principales modifications apportées par rapport à l'édition précédente sont énumérées ci-dessous: - Un sommaire a été ajouté, - L'introduction a été actualisée pour correspondre aux autres documents du TC89, - Le domaine d'application a été clarifié pour correspondre aux autres documents de la série CEI 60695-2, - Essais au fil incandescent, - Les termes et définitions pertinents pour le présent document ont été ajoutés, - L'Article 4 a été supprimé et les articles suivants ont été renumérotés en conséquence, - La description de l'alimentation a été actualisée avec des détails supplémentaires (voir 4.1), - Le système de mesure de la température (voir 4.3) et la description de la sous-couche spécifiée ont été actualisés (voir 4.4), - De nouvelles lignes directrices ont été introduites pour faciliter la vérification du système de mesure de la température (voir 5.2 et l'Annexe C), - L'essai commun produit a été clarifié (voir l'Article 7), - Les tolérances ont été modifiées pour tenir compte des dimensions du fil incandescent (voir Figure 1), - De nouvelles lignes directrices relatives aux observations de flambant ont été ajoutées (voir l'Annexe B). Elle a le statut de publication fondamentale de sécurité conformément au Guide CEI 104 et au Guide ISO/CEI 51. Cette norme doit être utilisée conjointement avec la CEI 60695-2-11, la CEI 60695-2-12 et la CEI 60695-2-13. Mots-clés: fil incandescent/chauffant, Fil incandescent

Preskušanje požarne ogroženosti - 2-10. del: Preskusne metode z žarilno žico - Aparat z žarilno žico in postopek splošnega preskusa

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 standardu, 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 zadevnih standardih IEC 60695-2-11, IEC 60695-2-12 in IEC 60695-2-13. Ta osnovna varnostna publikacija je namenjena tehničnim odborom za pripravo standardov v skladu z načeli vodil IEC Guide 104 in ISO/IEC Guide 51. Ena od odgovornosti tehničnih odborov je, da med pripravo publikacij uporabljajo osnovne varnostne publikacije, kadar je to primerno. Zahteve, preskusne metode ali preskusni pogoji iz te osnovne varnostne publikacije se ne uporabljajo, razen če so izrecno navedeni ali zajeti v ustrezne publikacije.

General Information

Status
Published
Publication Date
09-Jul-2013
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
05-Jul-2013
Due Date
09-Sep-2013
Completion Date
10-Jul-2013

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SLOVENSKI STANDARD
SIST EN 60695-2-10:2013
01-september-2013
1DGRPHãþD
SIST EN 60695-2-10:2002
Preskušanje požarne ogroženosti - 2-10. del: Preskusne metode z žarilno žico -
Aparat z žarilno žico in postopek splošnega preskusa
Fire hazard testing - Part 2-10: Glowing/hot-wire based test methods - Glow-wire
apparatus and common test procedure

Prüfungen zur Beurteilung der Brandgefahr - Teil 2-10: Prüfungen mit dem Glühdraht -

Glühdrahtprüfeinrichtungen und allgemeines Prüfverfahren

Essais relatifs aux risques du feu - Partie 2-10: Essais au fil incandescent/chauffant -

Appareillage et méthode commune d'essai
Ta slovenski standard je istoveten z: EN 60695-2-10:2013
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 60695-2-10:2013 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 60695-2-10:2013
---------------------- Page: 2 ----------------------
SIST EN 60695-2-10:2013
EUROPEAN STANDARD
EN 60695-2-10
NORME EUROPÉENNE
June 2013
EUROPÄISCHE NORM
ICS 13.220.40; 29.020 Supersedes EN 60695-2-10:2001
English version
Fire hazard testing -
Part 2-10: Glowing/hot-wire based test methods -
Glow-wire apparatus and common test procedure
(IEC 60695-2-10:2013)
Essais relatifs aux risques du feu - Prüfungen zur Beurteilung der
Partie 2-10: Essais au fil Brandgefahr -
incandescent/chauffant - Teil 2-10: Prüfverfahren mit dem
Appareillage et méthode commune d'essai Glühdraht -
(CEI 60695-2-10:2013) Glühdrahtprüfeinrichtung und allgemeines
Prüfverfahren
(IEC 60695-2-10:2013)

This European Standard was approved by CENELEC on 2013-05-14. 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, Former Yugoslav Republic of Macedonia, France, Germany,

Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,

Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60695-2-10:2013 E
---------------------- Page: 3 ----------------------
SIST EN 60695-2-10:2013
EN 60695-2-10:2013 - 2 -
Foreword

The text of document 89/1154/FDIS, future edition 2 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 60695-2-10:2013.
The following dates are fixed:
• latest date by which the document has (dop) 2014-02-14
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2016-05-14
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60695-2-10:2001.

EN 60695-2-10:2013 includes the following significant technical changes with respect to

EN 60695-2-10:2001:
– A table of contents has been added.
– The introduction has been updated to align with other TC 89 documents.

– The scope has been clarified to align with other documents in the EN 60695-2 Glow-wire series.

– Terms and definitions relevant to this document have been added.
– Clause 4 has been deleted and the remaining clauses renumbered.

– The description of the power supply has been updated with additional details (see 4.1).

– The temperature measuring system (see 4.3) and the description of the specified layer has been

updated (see 4.4).

– New guidance has been introduced to assist in the verification of the temperature measuring system

(see 5.2 and Annex C).
– The common test produced has been clarified (see Clause 7).

– The tolerances have been changed for the dimensions of the glow-wire (see Figure 1).

– New guidance on flaming observations has been added (see Annex B).

This standard is to be used in conjunction with EN 60695-2-11, EN 60695-2-12 and EN 60695-2-13.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent

rights.

This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment Designed

for Use within Certain Voltage Limits (LVD - 2006/95/EC).
---------------------- Page: 4 ----------------------
SIST EN 60695-2-10:2013
- 3 - EN 60695-2-10:2013
Endorsement notice

The text of the International Standard IEC 60695-2-10:2013 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 Harmonised as EN 60695-1-10.
IEC 60695-1-11 NOTE Harmonised as EN 60695-1-11.
---------------------- Page: 5 ----------------------
SIST EN 60695-2-10:2013
EN 60695-2-10:2013 - 4 -
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
Publication Year Title EN/HD Year
IEC 60584-1 - Thermocouples - EN 60584-1 -
Part 1: Reference tables
IEC 60584-2 - Thermocouples - EN 60584-2 -
Part 2: Tolerances
IEC 60695-2-11 - Fire hazard testing - EN 60695-2-11 -
Part 2-11: Glowing/hot-wire based test
methods - Glow-wire flammability test method
for end-products
IEC 60695-2-12 - Fire hazard testing - EN 60695-2-12 -
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 - EN 60695-2-13 -
Part 2-13: Glowing/hot-wire based test
methods - Glow-wire ignition temperature
(GWIT) test method for materials
IEC Guide 104 2010 The preparation of safety publications and the - -
use of basic safety publications and group
safety publications
ISO/IEC Guide 51 1999 Safety aspects - Guidelines for their inclusion - -
in standards
ISO 4046-4 2002 Paper, board, pulps and related terms - - -
Vocabulary -
Part 4: Paper and board grades and
converted products
ISO 13943 2008 Fire safety - Vocabulary EN ISO 13943 2010
---------------------- Page: 6 ----------------------
SIST EN 60695-2-10:2013
IEC 60695-2-10
Edition 2.0 2013-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
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
PRICE CODE
INTERNATIONALE
CODE PRIX S
ICS 13.220.40; 29.020 ISBN 978-2-83220-716-1

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
---------------------- Page: 7 ----------------------
SIST EN 60695-2-10:2013
– 2 – 60695-2-10 © IEC:2013
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope ............................................................................................................................... 6

2 Normative references ....................................................................................................... 6

3 Terms and definitions ....................................................................................................... 7

4 Description of the test apparatus ...................................................................................... 8

4.1 Glow-wire ................................................................................................................ 8

4.2 Test circuit and connections .................................................................................... 8

4.3 Temperature measuring system............................................................................... 9

4.4 Specified layer ........................................................................................................ 9

4.5 Test chamber .......................................................................................................... 9

4.6 Timing device ........................................................................................................ 10

5 Verification of the apparatus ........................................................................................... 10

5.1 Verification of the glow-wire tip .............................................................................. 10

5.2 Verification of the temperature measuring system ................................................. 10

6 Conditioning ................................................................................................................... 10

7 Common test procedure ................................................................................................. 10

7.1 Test specimen support .......................................................................................... 10

7.2 Glow-wire temperature .......................................................................................... 11

7.3 Application of the glow-wire ................................................................................... 11

Annex A (informative) Equipment manufacturers and suppliers ............................................ 16

Annex B (informative) Guidance on “ignition” and “flaming” observations ............................. 17

Annex C (informative) Guidance on the verification procedure of the glow-wire

temperature measuring system by the heating current .......................................................... 19

Bibliography .......................................................................................................................... 21

Figure 1 – Glow-wire and position of thermocouple ............................................................... 12

Figure 2 – Test circuit ........................................................................................................... 12

Figure 3 – Test apparatus examples ..................................................................................... 14

Figure 4 – Test specimen support (example – see Figures 3a and 3b) .................................. 15

Figure B.1 – Example of a brightly shining flame ................................................................... 17

Figure B.2 – Example of a blue corona at the glow-wire tip ................................................... 18

Figure B.3 – Example of a blue corona near the glow-wire tip ............................................... 18

Figure C.1 – Correlation curve between the heating current and the glow-wire

temperature (example) .......................................................................................................... 20

---------------------- Page: 8 ----------------------
SIST EN 60695-2-10:2013
60695-2-10 © IEC:2013 – 3 –
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.

International Standard IEC 60695-2-10 has been prepared by IEC technical committee 89:

Fire hazard testing.
This second edition of IEC 60695-2-10 cancels and replaces the first edition of
IEC 60695-2-10 published in 2000. This edition constitutes a technical revision.

It has the status of a basic safety publication in accordance with IEC Guide 104:2010 and

ISO/IEC Guide 51:1999.

This standard is to be used in conjunction with IEC 60695-2-11, IEC 60695-2-12, and

IEC 60695-2-13.

The main changes with respect to the previous edition are listed below. The rationale can be

found in 89/960A/CC, 89/944A/CC, and 89/1030/CC.
---------------------- Page: 9 ----------------------
SIST EN 60695-2-10:2013
– 4 – 60695-2-10 © IEC:2013
– A table of contents has been added.
– The introduction has been updated to align with other TC89 documents.

– The scope has been clarified to align with other documents in the IEC 60695-2 Glow-wire

series.
– Terms and definitions relevant to this document have been added.
– Clause 4 has been deleted and the remaining clauses renumbered.

– The description of the power supply has been updated with additional details (see 4.1).

– The temperature measuring system (see 4.3) and the description of the specified layer has

been updated (see 4.4).

– New guidance has been introduced to assist in the verification of the temperature

measuring system (see 5.2 and Annex C).
– The common test produced has been clarified (see Clause 7).

– The tolerances have been changed for the dimensions of the glow-wire (see Figure 1).

– New guidance on flaming observations has been added (see Annex B).
The text of this standard is based on the following documents:
FDIS Report on voting
89/1154/FDIS 89/1163/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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 publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication 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.
---------------------- Page: 10 ----------------------
SIST EN 60695-2-10:2013
60695-2-10 © IEC:2013 – 5 –
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, reasonable foreseeable abnormal

use, malfunction, and/or failure. IEC 60695-1-10 was developed, together with its companion,

IEC 60695-1-11, 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).
---------------------- Page: 11 ----------------------
SIST EN 60695-2-10:2013
– 6 – 60695-2-10 © IEC:2013
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 standard 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 the respective standards

IEC 60695-2-11, IEC 60695-2-12 and IEC 60695-2-13.

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.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. 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: Reference tables
IEC 60584-2, Thermocouples – Part 2: 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

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
---------------------- Page: 12 ----------------------
SIST EN 60695-2-10:2013
60695-2-10 © IEC:2013 – 7 –

IEC Guide 104:2010, The preparation of safety publications and the use of basic safety

publications and group safety publications

ISO/IEC Guide 51:1999, Safety aspects – Guidelines for their inclusion in standards

ISO 4046-4:2002, Paper, board, pulps and related terms – Vocabulary – Part 4: Paper and

board grades and converted products
ISO 13943:2008, Fire safety – Vocabulary
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 13943:2008, some

of which are reproduced below for the user’s convenience, as well as the following apply.

3.1
combustible, adjective
capable of being ignited and burned
[SOURCE: ISO 13943:2008, definition 4.43]
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 13943:2008, definition 4.70]
3.3
fire hazard

physical object or condition with a potential for an undesirable consequence from fire

[SOURCE: ISO 13943:2008, definition 4.112]
3.4
fire test

test that measures behaviour of a fire 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 13943:2008, definition 4.132]
3.5
flame, noun

rapid, self-sustaining, sub-sonic propagation of combustion in a gaseous medium, usually with

emission of light
[SOURCE: ISO 13943:2008, definition 4.133]
3.6
flammability
ability of a material or product to burn with a flame under specified conditions
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SIST EN 60695-2-10:2013
– 8 – 60695-2-10 © IEC:2013
[SOURCE: ISO 13943:2008, definition 4.151]
3.7
ignition
DEPRECATED: sustained ignition
〈general〉 initiation of combustion
[SOURCE: ISO 13943:2008, definition 4.187]
3.8
test temperature

temperature to which the tip of the glow-wire is heated and stabilized prior to any contact with

the test specimen
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.

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 of 0,95 N ± 0,10 N to the test specimen during the application of the glow-wire.

The force shall be maintained at this value when the glow-wire or the test specimen is moved

horizontally one towards the other. The penetration of the tip of the glow-wire into and through

the test specimen shall be limited to 7 mm ± 0,5 mm.

The test apparatus shall be so designed that burning or glowing particles falling from the test

specimen are able to fall without obstruction onto the layer as specified in 4.4.

Two typical examples of the test apparatus are shown in Figures 3a and 3b.

NOTE 2 The apparatus shown in Figure 3b has been found useful when testing heavy and/or awkwardly shaped

test specimens.
4.2 Test circuit and connections

The glow-wire is heated by a simple electric circuit as shown in Figure 2. There shall be no

feedback mechanism or circuit to maintain the temperature. The power supply for the glow-

wire test apparatus shall be a stabilized voltage source (± 2 % rms). The test circuit shall

contain a current measuring device which indicates a true rms value with a maximum error of

1,0 %.

Due to the high currents involved, it is essential that all electrical connections for the glow-

wire are capable of carrying the current without affecting the performance or long-term

stability of the circuit. For the glow-wire to stud connection, a sufficient contact area (typically

at least 60 mm at each end) is necessary for the stable and loss-less current necessary for

the test. The glow-wire to stud connection shall be tightly screwed, soldered, or brazed

between the glow-wire and studs.
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SIST EN 60695-2-10:2013
60695-2-10 © IEC:2013 – 9 –

NOTE The typical current necessary for heating the tip to a temperature of 960 °C is between 120 A and 150 A.

4.3 Temperature measuring system

The temperature of the tip of the glow-wire shall be measured by a class 1 (see IEC 60584-2)

mineral-insulated metal-sheathed fine-wire thermocouple with an insulated junction. It shall

have an overall nominal diameter of 1,0 mm. The thermocouple wires shall be suitable for

continuous operation at temperatures up to 960 °C (e.g. chromel/alumel (Type K) – see

IEC 60584-1). The welded point shall be located inside the sheath as close to the tip as

practicable. The sheath shall consist of a metal resistant to continuous operation at a

temperature of at least 1 050 °C.

NOTE A sheath made from a nickel-based heat-resistant alloy satisfies the above requirements.

The glow-wire, with the thermocouple inserted, is shown in Figure 1, Detail Z.
The thermocouple is arranged in
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