SIST EN IEC 60695-6-2:2018

Fire hazard testing - Part 6-2: Smoke obscuration - Summary and relevance of test methods (IEC 60695-6-2:2018)

This part of IEC 60695 provides a summary of commonly used test methods for the
assessment of smoke obscuration. It presents a brief summary of static and dynamic test
methods in common use, either as international standards or national or industry standards. It
includes special observations on their relevance to electrotechnical products and their
materials and to fire scenarios, and gives recommendations on their use.
This basic safety publication shall be used 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 6-2: Sichtminderung durch Rauch - Zusammenfassung und Anwendbarkeit von Prüfverfahren (IEC 60695-6-2:2018)

Essais relatifs aux risques du feu - Partie 6-2: Opacité des fumées - Résumé et pertinence des méthodes d'essais (IEC 60695-6-2:2018)

IEC 60695-6-2:2018 La présente partie de l’IEC 60695 donne un résumé des méthodes d'essais couramment utilisées pour évaluer l’obscurcissement par la fumée. Elle présente un résumé des méthodes d'essais dynamiques et statiques communément utilisées, aussi bien comme normes internationales que nationales ou en tant que normes industrielles. Elle inclut des observations particulières relatives à leur pertinence par rapport aux produits électrotechniques et leurs matériaux et à des scénarios d’incendie, et donne des recommandations pour leur utilisation.
Cette publication fondamentale de sécurité doit être utilisée par les comités d’études pour l’établissement de leurs normes conformément aux principes exposés dans le Guide 104 de l’IEC et dans le Guide ISO/IEC 51.
Elle a le statut d’une publication fondamentale de sécurité conformément au Guide IEC 104 et au Guide ISO/IEC 51.
Cette norme doit être utilisée conjointement avec l’IEC 60695-6-1.
Cette norme annule et remplace l’IEC 60695-6-2 parue en 2011. Cette deuxième édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) mise à jour de l’introduction;
b) mise à jour des références normatives;
c) nouveau texte au 4.1;
d) suppression des références aux IEC 60695-6-30 et -31 (supprimées)
e) mises à jour en fonction de l’ISO 5659-2;
f) suppression des références à la BS 6853 et la CEI 20-37-3 (remplacées);
g) suppression des références à l’ISO/TR 5924 (supprimée);
h) mise à jour du texte en fonction de l’EN 50399;
i) mise à jour du texte en fonction de l’ISO 5660-1;
j) ajout d’un nouveau Paragraphe 7.5
k) suppression de l’Annexe B;
l) suppression de l’Annexe E;
m) ajout de références bibliographiques.
Mots clés: risques du feu, Opacité des fumées

Preskušanje požarne ogroženosti - 6-2. del: Otemnitev dima - Povzetek in relevantnost preskusnih metod (IEC 60695-6-2:2018)

Ta del standarda IEC 60695 vsebuje povzetek običajno uporabljenih preskusnih metod za ocenjevanje otemnitve dima. Podaja kratek povzetek običajnih statičnih in dinamičnih preskusnih metod bodisi kot mednarodne standarde bodisi kot nacionalne ali industrijske standarde. Vključuje posebna opažanja glede njihovega pomena za elektrotehnične izdelke in njihove materiale ter požarne scenarije in podaja priporočila glede njihove uporabe.
To osnovno varnostno publikacijo morajo upoštevati tehnični odbori pri pripravi standardov v skladu z načeli vodil IEC 104 in ISO/IEC 51.
Ena od odgovornosti tehničnega odbora je, da pri pripravi publikacij uporablja osnovne varnostne publikacije (kjer 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 ustreznih publikacijah.

General Information

• Status: Published
• Publication Date: 27-Sep-2018
• ICS: 13.220.40 - Ignitability and burning behaviour of materials and products
• ICS: 29.020 - Electrical engineering in general
• Technical Committee: I09 - Imaginarni 09
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 26-Sep-2018
• Due Date: 01-Dec-2018
• Completion Date: 28-Sep-2018
• Ref Project: EN IEC 60695-6-2:2018 - Fire hazard testing - Part 6-2: Smoke obscuration - Summary and relevance of test methods

Relations

• Revised: SIST EN 60695-6-2:2012 - Fire hazard testing - Part 6-2: Smoke obscuration - Summary and relevance of test methods
• Effective Date: 07-Jun-2016
• Replaces: SIST EN 60695-6-2:2012 - Fire hazard testing - Part 6-2: Smoke obscuration - Summary and relevance of test methods
• Effective Date: 25-Sep-2018

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 60695-6-2:2018
01-november-2018
1DGRPHãþD
SIST EN 60695-6-2:2012
Preskušanje požarne ogroženosti - 6-2. del: Otemnitev dima - Povzetek in
relevantnost preskusnih metod (IEC 60695-6-2:2018)
Fire hazard testing - Part 6-2: Smoke obscuration - Summary and relevance of test
methods (IEC 60695-6-2:2018)
Prüfungen zur Beurteilung der Brandgefahr - Teil 6-2: Sichtminderung durch Rauch -
Zusammenfassung und Anwendbarkeit von Prüfverfahren (IEC 60695-6-2:2018)
Essais relatifs aux risques du feu - Partie 6-2: Opacité des fumées - Résumé et
pertinence des méthodes d'essais (IEC 60695-6-2:2018)
Ta slovenski standard je istoveten z: EN IEC 60695-6-2:2018
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 60695-6-2:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60695-6-2:2018

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SIST EN IEC 60695-6-2:2018


EUROPEAN STANDARD EN IEC 60695-6-2

NORME EUROPÉENNE

EUROPÄISCHE NORM
September 2018
ICS 13.220.99; 29.020 Supersedes EN 60695-6-2:2011
English Version
Fire hazard testing - Part 6-2: Smoke obscuration -
Summary and relevance of test methods
(IEC 60695-6-2:2018)
Essais relatifs aux risques du feu -  Prüfungen zur Beurteilung der Brandgefahr -
Partie 6-2: Opacité des fumées - Résumé et pertinence des Teil 6-2: Sichtminderung durch Rauch - Zusammenfassung
méthodes d'essais und Anwendbarkeit von Prüfverfahren
(IEC 60695-6-2:2018) (IEC 60695-6-2:2018)
This European Standard was approved by CENELEC on 2018-07-10. 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, 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
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 60695-6-2:2018 E

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SIST EN IEC 60695-6-2:2018
EN IEC 60695-6-2:2018
European foreword
The text of document 89/1399/FDIS, future edition 2 of IEC 60695-6-2, prepared by IEC/TC 89 "Fire
hazard testing" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN IEC 60695-6-2:2018.

The following dates are fixed:
(dop) 2019-04-10
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-07-10
standards conflicting with the
document have to be withdrawn

This document supersedes EN 60695-6-2:2011.

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.

Endorsement notice
The text of the International Standard IEC 60695-6-2:2018 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.
ISO 5659-2 NOTE Harmonized as EN ISO 5659-2.
IEC 61034-1 NOTE Harmonized as EN 61034-1.
IEC 61034-2 NOTE Harmonized as EN 61034-2.
IEC 60332-3-10 NOTE Harmonized as EN 60332-3-10.
2

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SIST EN IEC 60695-6-2:2018
EN IEC 60695-6-2:2018
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 60695-6-1 -  Fire hazard testing - Part 6-1: Smoke EN 60695-6-1 -
obscuration - General guidance
ISO/IEC Guide 51 -  Safety aspects - Guidelines for their - -
inclusion in standards
IEC Guide 104 -  The preparation of safety publications and - -
the use of basic safety publications and
group safety publications
ISO 5660-1 2015 Reaction-to-fire tests - Heat release, - -
smoke production and mass loss rate -
Part-1: Heat release rate (cone calorimeter
method) and smoke production rate
(dynamic measurement)
ISO 13943 2008 Fire safety - Vocabulary EN ISO 13943 2010
ISO 19706 2011 Guidelines for assessing the fire threat to - -
people

3

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SIST EN IEC 60695-6-2:2018



IEC 60695-6-2

®


Edition 2.0 2018-06




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE




BASIC SAFETY PUBLICATION

PUBLICATION FONDAMENTALE DE SÉCURITÉ






Fire hazard testing –

Part 6-2: Smoke obscuration – Summary and relevance of test methods




Essais relatifs aux risques du feu –

Partie 6-2: Opacité des fumées – Résumé et pertinence des méthodes d'essais
















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 13.220.99; 29.020 ISBN 978-2-8322-5780-7



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 60695-6-2:2018
– 2 – IEC 60695-6-2:2018 © IEC 2018
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Types of of test method . 11
4.1 General . 11
4.2 The physical fire model . 11
4.3 Static test methods . 12
4.4 Dynamic test methods . 12
5 Types of test specimen . 14
6 Published static test methods . 14
6.1 General . 14
3
6.2 Determination of smoke opacity in a 0,51 m chamber . 14
6.2.1 Standards which use a vertically oriented test specimen . 14
6.2.2 Standard which uses a horizontally oriented test specimen . 16
3
6.3 Determination of smoke density in a 27 m smoke chamber . 18
6.3.1 Standards . 18
6.3.2 Purpose and principle . 18
6.3.3 Test specimen . 18
6.3.4 Method . 18
6.3.5 Repeatability and reproducibility . 19
6.3.6 Relevance of test data and special observations. 19
7 Published dynamic test methods . 19
7.1 General . 19
7.2 Determination of smoke density generated by electric cables mounted on a
horizontal ladder . 20
7.2.1 Standards . 20
7.2.2 Purpose and principle . 20
7.2.3 Test specimen . 20
7.2.4 Method . 20
7.2.5 Repeatability and reproducibility . 20
7.2.6 Relevance of test data and special observations. 20
7.3 Determination of smoke generated by electrical cables mounted on a vertical

ladder . 20
7.3.1 ASTM and UL standards . 20
7.3.2 European standard . 21
7.4 Determination of smoke using a cone calorimeter . 23
7.4.1 Standards . 23
7.4.2 Purpose and principle . 23
7.4.3 Test specimen . 23
7.4.4 Method . 23
7.4.5 Repeatability and reproducibility . 24
7.4.6 Relevance of test data and special observations. 24
7.5 Determination of smoke generated by discrete (non-continuous) products . 24
7.5.1 Standards . 24

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IEC 60695-6-2:2018 © IEC 2018 – 3 –
7.5.2 Purpose and principle . 24
7.5.3 Test specimen . 25
7.5.4 Method . 25
7.5.5 Repeatability and reproducibility . 25
7.5.6 Relevance of test data and special observations. 25
8 Overview of methods and relevance of data . 25
Annex A (informative) Repeatability and reproducibility data – NBS smoke chamber –
Interlaboratory tests from the French standard NF C20-902-1 and NF C20-902-2 . 28
Annex B (informative) Repeatability and reproducibility data – "Three metre cube"
smoke chamber – French interlaboratory tests according to IEC 61034-2 . 29
Annex C (informative) Repeatability and reproducibility data – NFPA 262 . 30
Bibliography . 31

Table 1 – Characteristics of fire stages (ISO 19706:2011) . 13
Table 2 – Overview of smoke test methods . 26
Table A.1 – Measurement of D . 28
m
Table B.1 – Measurement of transmission expressed as a percentage . 29
Table C.1 – Measurements of Peak Optical Density . 30
Table C.2 – Measurements of Average Optical Density . 30

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SIST EN IEC 60695-6-2:2018
– 4 – IEC 60695-6-2:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

FIRE HAZARD TESTING –

Part 6-2: Smoke obscuration –
Summary and relevance of test methods

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 60695-6-2 has been prepared by IEC technical committee 89: Fire
hazard testing.
This standard cancels and replaces IEC 60695-6-2 published in 2011. This second edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) updated introduction;
b) updated normative references;
c) new text in 4.1;
d) deletion of references to IEC 60695-6-30 and -31 (withdrawn)
e) updates with respect to ISO 5659-2;

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SIST EN IEC 60695-6-2:2018
IEC 60695-6-2:2018 © IEC 2018 – 5 –
f) deletion of references to BS 6853 and CEI 20-37-3 (superseded);
g) deletion of references to ISO/TR 5924 (withdrawn);
h) updated text with respect to EN 50399;
i) updated text with respect to ISO 5660-1;
j) addition of new Subclause 7.5
k) deletion of Annex B;
l) deletion of Annex E;
m) additional bibliographic references.
This standard is to be used in conjunction with IEC 60695-6-1.
It has the status of a basic safety publication in accordance with IEC Guide 104 and
ISO/IEC Guide 51.
The text of this standard is based on the following documents:
FDIS Report on voting
89/1399/FDIS 89/1405/RVD

Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 60695 series, under the general title Fire hazard testing, can be
found on the IEC website.
Part 6 consists of the following parts:
Part 6-1: Smoke obscuration – General guidance
Part 6-2: Smoke obscuration – Summary and relevance of test methods
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.

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SIST EN IEC 60695-6-2:2018
– 6 – IEC 60695-6-2:2018 © IEC 2018
INTRODUCTION
In the design of an 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 equipment design, as well as the choice of materials, is to reduce the risk of fire to a
tolerable level even in the event of reasonably foreseeable (mis)use, malfunction or failure.
1
IEC 60695-1-10 [1] , IEC 60695-1-11 [2], and IEC 60695-1-12 [3] provide guidance on how
this is to be accomplished.
Fires involving electrotechnical products can also be initiated from external non-electrical
sources. Considerations of this nature are dealt with in an overall fire hazard assessment.
The aim of the IEC 60695 series is to save lives and property by reducing the number of fires
or reducing the consequences of the fire. This can be accomplished by:
• trying to prevent ignition caused by an electrically energised component part and, in the
event of ignition, to confine any resulting fire within the bounds of the enclosure of the
electrotechnical product.
• trying to minimise flame spread beyond the product’s enclosure and to minimise the
harmful effects of fire effluents including heat, smoke, and toxic or corrosive combustion
products.
One of the contributing hazards is the release of smoke, which may cause loss of vision
and/or disorientation which could impede escape from the building, or fire fighting.
This part of IEC 60695 describes smoke test methods in common use to assess the smoke
release from electrotechnical products, or from materials used in electrotechnical products. It
gives guidance to product committees wishing to incorporate test methods for smoke
obscuration in product standards.


___________
1
 Numbers in square brackets refer to the bibliography.

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IEC 60695-6-2:2018 © IEC 2018 – 7 –
FIRE HAZARD TESTING –

Part 6-2: Smoke obscuration –
Summary and relevance of test methods



1 Scope
This part of IEC 60695 provides a summary of commonly used test methods for the
assessment of smoke obscuration. It presents a brief summary of static and dynamic test
methods in common use, either as international standards or national or industry standards. It
includes special observations on their relevance to electrotechnical products and their
materials and to fire scenarios, and gives recommendations on their use.
This basic safety publication shall be used 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 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 60695-6-1, Fire hazard testing – Part 6-1: Smoke obscuration – General guidance
ISO/IEC Guide 51, Safety aspects – Guidelines for their inclusion in standards
IEC GUIDE 104, The preparation of safety publications and the use of basic safety
publications and group safety publications
ISO 5660-1:2015, Reaction-to-fire tests – Heat release, smoke production and mass loss rate
– Part 1: Heat release rate (cone calorimeter method) and smoke production rate (dynamic
measurement)
ISO 13943:2008, Fire safety – Vocabulary
ISO 19706:2011, Guidelines for assessing the fire threat to people
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 users’ convenience, and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:

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• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
combustion
exothermic reaction of a substance with an oxidising agent
Note 1 to entry: Combustion generally emits fire effluent accompanied by flames and/or glowing.
[SOURCE: ISO 13943:2008, 4.46]
3.2
extinction area of smoke
product of the volume occupied by smoke and the extinction coefficient of the smoke
2
Note 1 to entry: It is a measure of the amount of smoke, and the typical units are square metres (m ).
[SOURCE: ISO 13943:2008, 4.92]
3.3
extinction coefficient
natural logarithm of the ratio of incident light intensity to transmitted light intensity, per unit
light path length
-1
Note 1 to entry: Typical units are reciprocal metres (m ).
[SOURCE: ISO 13943:2008, 4.93]
3.4
fire
(general) process of combustion characterized by the emission of heat and fire effluent and
usually accompanied by smoke, flame, glowing or a combination thereof
Note 1 to entry: In the English language the term "fire" is used to designate three concepts, two of which, fire
(3.5) and fire (3.6), relate to specific types of self-supporting combustion with different meanings and two of them
are designated using two different terms in both French and German.
[SOURCE: ISO 13943:2008, 4.96]
3.5
fire
(controlled) self-supporting combustion that has been deliberately arranged to provide useful
effects and is limited in its extent in time and space
[SOURCE: ISO 13943:2008, 4.97]
3.6
fire
(uncontrolled) self-supporting combustion that has not been deliberately arranged to provide
useful effects and is not limited in its extent in time and space
[SOURCE: ISO 13943:2008, 4.98]
3.7
fire effluent
totality of gases and aerosols, including suspended particles, created by combustion or
pyrolysis in a fire

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[SOURCE: ISO 13943:2008, definition 4.105]
3.8
fire hazard
physical object or condition with a potential for an undesirable consequence from fire
[SOURCE: ISO 13943:2008, 4.112]
3.9
fire model
fire simulation
calculation method that describes a system or process related to fire development, including
fire dynamics and the effects of fire
[SOURCE: ISO 13943:2008, 4.116]
3.10
fire scenario
qualitative description of the course of a fire with respect to time, identifying key events that
characterise the studied fire and differentiate it from other possible fires
Note 1 to entry: It typically defines the ignition and fire growth processes, the fully developed fire stage, the fire
decay stage, and the environment and systems that impact on the course of the fire.
[SOURCE: ISO 13943:2008, 4.129]
3.11
heat flux
amount of thermal energy emitted, transmitted or received per unit area and per unit time
-2
Note 1 to entry: The typical units are watts per square metre (W × m ).
[SOURCE: ISO 13943:2008, 4.173]
3.12
ignition
sustained ignition (deprecated)
(general) initiation of combustion
[SOURCE: ISO 13943:2008, 4.187]
3.13
ignition
sustained ignition (deprecated)
(flaming combustion) initiation of sustained flame
[SOURCE: ISO 13943:2008, 4.188]
3.14
mass optical density of smoke
optical density of smoke multiplied by a factor, V/(∆m L), where V is the volume of the test
chamber, ∆m is the mass lost from the test specimen, and L is the light path length
2 -1
Note 1 to entry: The typical units are square metres per gram (m × g ).
[SOURCE: ISO 13943:2008, 4.225]

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SIST EN IEC 60695-6-2:2018
– 10 – IEC 60695-6-2:2018 © IEC 2018
3.15
obscuration by smoke
reduction in the intensity of light due to its passage through smoke
cf. extinction area of smoke (3.2) and specific extinction area of smoke (3.23).
Note 1 to entry: In practice, obscuration by smoke is usually measured as the transmittance, which is normally
expressed as a percentage.
Note 2 to entry: Obscuration by smoke causes a reduction in visibility.
[SOURCE: ISO 13943:2008, 4.242]
3.16
optical density of smoke
measure of the attenuation of a light beam passing through smoke expressed as the logarithm
to the base 10 of the opacity of smoke
cf. specific optical density of smoke (3.25)
Note 1 to entry: The optical density of smoke is dimensionless.
[SOURCE: ISO 13943:2008, 4.244]
3.17
physical fire model
laboratory process, including the apparatus, the environment and the fire test procedure
intended to represent a certain phase of a fire
[SOURCE: ISO 13943:2008, 4.251]
3.18
plenum
area located a
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