IEC 60695-6-2:2011

Fire hazard testing - Part 6-2: Smoke obscuration - Summary and relevance of test methods

IEC 60695-6-2:2011 provides a summary of the test methods that are used in 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 it gives recommendations on their use. This standard cancels and replaces IEC/TS 60695-6-2 published in 2005. This first edition constitutes a technical revision. The main changes with respect to the previous edition are listed below:
- this publication has been re-designated as an International Standard;
- updated normative references;
- updated terms and definitions; new test method Clause 7.3.2;
- numerous editorial changes of a technical nature throughout the publication.
It has the status of a horizontal standard in accordance with IEC Guide 104 and ISO/IEC Guide 51.
This publication is to be read in conjunction with  IEC 60695-6-1:2005.

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

La CEI 60695-6-2:2011 donne un résumé des méthodes d'essais qui sont utilisées pour évaluer l'obscurcissement par la fumée. Elle présente un bref résumé des méthodes d'essais dynamiques et statiques communément utilisées, aussi bien comme normes internationales ou nationales ou normes industrielles. Elle inclut des observations particulières relatives à un scénario feu, pour les produits électrotechniques et leurs matériaux, et donne des recommandations pour leurs utilisations. Cette norme annule et remplace la CEI/TS 60695-6-2 publiée en 2005. Cette première édition constitue une révision technique. Les principales modifications par rapport à l'édition antérieure sont indiquées ci-dessous:
- Cette publication a été reprise pour devenir une norme internationale;
- mise à jour des références normatives;
- mise à jour de termes et définitions;
- nouvelle méthode d'essai Article 7.3.2;
- nombreuses modifications rédactionnelles de nature technique dans toute la publication.
Elle a le statut de norme horizontale conformément au IEC Guide 104 et au guide ISO/CEI 51.
Cette publication doit être lue conjointement avec la  CEI 60695-6-1:2005.

General Information

• Status: Published
• Publication Date: 24-Aug-2011
• ICS: 13.220.99 - Other standards related to protection against fire
• ICS: 29.020 - Electrical engineering in general
• Technical Committee: TC 89 - Fire hazard testing
• Drafting Committee: WG 11 - TC 89/WG 11
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 05-Jun-2018

Relations

• Replaces: IEC TS 60695-6-2:2005 - Fire hazard testing - Part 6-2: Smoke obscuration - Summary and relevance of test methods
• Effective Date: 05-Sep-2023
• Revised: IEC 60695-6-2:2018 - Fire hazard testing - Part 6-2: Smoke obscuration - Summary and relevance of test methods
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60695-6-2 ®
Edition 1.0 2011-08
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

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IEC 60695-6-2 ®
Edition 1.0 2011-08
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
PRICE CODE
INTERNATIONALE
CODE PRIX V
ICS 13.220.99; 29.020 ISBN 978-2-88912-625-5

– 2 – 60695-6-2 © IEC:2011
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 Physical fire model . 11
4.3 Static test methods . 11
4.4 Dynamic test methods . 11
5 Types of test specimen . 13
6 Published static test methods . 13
6.1 General . 13
6.2 Determination of smoke opacity in a 0,51 m chamber . 13
6.2.1 Standards which use a vertically oriented test specimen . 13
6.2.2 Standard which uses a horizontally oriented test specimen . 15
6.3 Determination of smoke density in a 27 m smoke chamber . 17
6.3.1 Standards . 17
6.3.2 Purpose and principle . 17
6.3.3 Test specimen . 17
6.3.4 Method . 17
6.3.5 Repeatability and reproducibility . 18
6.3.6 Relevance of test data and special observations . 18
6.4 Determination of specific optical density using a dual-chamber test . 18
6.4.1 Standards . 18
6.4.2 Purpose and principle . 18
6.4.3 Test specimen . 18
6.4.4 Method . 19
6.4.5 Repeatability and reproducibility . 19
6.4.6 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 . 19
7.2.1 Standards . 19
7.2.2 Purpose and principle . 19
7.2.3 Test specimen . 19
7.2.4 Method . 19
7.2.5 Repeatability and reproducibility . 19
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 Standards . 20
7.3.2 prEN 50399 . 21
7.4 Determination of smoke using a cone calorimeter . 22
7.4.1 Standards . 22

60695-6-2 © IEC:2011 – 3 –
7.4.2 Purpose and principle . 22

7.4.3 Test specimen . 22

7.4.4 Method . 22

7.4.5 Repeatability and reproducibility . 23

7.4.6 Relevance of test data and special observations . 23

8 Overview of methods and relevance of data . 24

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 . 27

Annex B (informative) Repeatability and reproducibility data – ISO 5659-2 . 28

Annex C (informative) Repeatability and reproducibility data – "Three metre cube"
smoke chamber – French interlaboratory tests according to IEC 61034-2 . 30
Annex D (informative) Repeatability and reproducibility data – NFPA 262 . 31
Annex E (informative) Precision data of smoke measurement in ISO 5660-2 . 32
Bibliography . 33

Table 1 – Characteristics of fire stages (ISO 19706) . 12
Table 2 – Overview of smoke test methods. 25
Table A.1 – Measurement of D . 27
m
Table B.1 – Measurement of D 10 . 28
s
Table B.2 – Test results for poly-carbonate. 28
Table B.3 – Test results for PVC flooring . 29
Table C.1 – Measurement of transmission expressed as a percentage . 30
Table E.1 – Combinations of materials of upholstered furniture . 32
Table E.2 – Repeatability and Reproducibility of specific extinction area (m /kg). 32

– 4 – 60695-6-2 © IEC:2011
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 prepara
...