EN IEC 60695-6-1:2021

Fire hazard testing - Part 6-1: Smoke obscuration - General guidance

IEC 60695-6-1:2021 is available as IEC 60695-6-1:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60695-6-1:2021 gives guidance on: a) the optical measurement of obscuration of smoke; b) general aspects of optical smoke test methods; c) consideration of test methods; d) expression of smoke test data; e) the relevance of optical smoke data to hazard assessment. This basic safety publication focusing on safety guidance 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. This third edition cancels and replaces the second edition of IEC 60695-6-1 published in 2005 and Amendment 1:2010. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - References to IEC TS 60695-6-30 (withdrawn in 2016) have been removed. - References to IEC TS 60695-6-31 (withdrawn in 2016) have been removed. - References to ISO 5659-2 have been inserted. - The scope contains some additional text. - Terms and definitions have been updated. - Subclause 3.2 has been updated. - Subclause 7.1 has been updated. It has the status of a basic safety publication in accordance with IEC Guide 104 and ISO/IEC Guide 51. This International Standard is to be used in conjunction with IEC 60695-6-2.

Prüfungen zur Beurteilung der Brandgefahr - Teil 6-1: Sichtminderung durch Rauch - Allgemeiner Leitfaden

Essais relatifs aux risques du feu - Partie 6-1: Obscurcissement dû à la fumée - Recommandations générales

IEC 60695-6-1:2021 est disponible sous forme de IEC 60695-6-1:2021 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 60695-6-1 fournit des recommandations relatives: a) au mesurage optique de l'obscurcissement de la lumière par la fumée; b) aux aspects généraux des méthodes d’essais optiques de la fumée; c) aux considérations concernant les méthodes d’essai; d) à l’expression des résultats d’essais de fumée; e) à la pertinence des résultats des mesurages optiques de la fumée pour l’évaluation du danger. La présente publication fondamentale de sécurité portant sur des recommandations de sécurité est avant tout 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 104 de l’IEC et dans 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 troisième édition annule et remplace la deuxième édition de l’IEC 60695-6-1 parue en 2005 et l’Amendement 1:2010. Elle constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - Les références à l’IEC TS 60695-6-30 (annulée en 2016) ont été supprimées. - Les références à l’IEC TS 60695-6-31 (annulée en 2016) ont été supprimées. - Des références à l’ISO 5659-2 ont été ajoutées. - Le domaine d’application contient du texte supplémentaire. - Les termes et définitions ont été mis à jour. - Le paragraphe 3.2 a été mis à jour. - Le paragraphe 7.1 a été mis à jour. Elle a le statut de publication fondamentale de sécurité, conformément au Guide IEC 104 et au Guide ISO/IEC 51. Cette Norme internationale doit être utilisée conjointement avec l’IEC 60695-6-2.

Preskušanje požarne ogroženosti - 6-1. del: Otemnitev dima - Splošna navodila (IEC 60695-6-1:2021)

General Information

• Status: Published
• Publication Date: 16-Sep-2021
• ICS: 13.220.99 - Other standards related to protection against fire
• ICS: 29.020 - Electrical engineering in general
• Technical Committee: CLC/SR 89 - Fire hazard testing
• Drafting Committee: IEC/TC 89 - IEC_TC_89
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 17-Sep-2021
• Completion Date: 17-Sep-2021
• Ref Project: SIST EN IEC 60695-6-1:2021 - Fire hazard testing - Part 6-1: Smoke obscuration - General guidance (IEC 60695-6-1:2021)

Relations

• Replaces: EN 60695-6-1:2005/A1:2010 - Fire hazard testing - Part 6-1: Smoke obscuration - General guidance
• Effective Date: 26-Jan-2023
• Replaces: EN 60695-6-1:2005 - Fire hazard testing - Part 6-1: Smoke obscuration - General guidance
• Effective Date: 25-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2021
Nadomešča:
SIST EN 60695-6-1:2005
SIST EN 60695-6-1:2005/A1:2010
Preskušanje požarne ogroženosti - 6-1. del: Otemnitev dima - Splošna navodila
(IEC 60695-6-1:2021)
Fire hazard testing - Part 6-1: Smoke obscuration - General guidance (IEC 60695-6-
1:2021)
Prüfungen zur Beurteilung der Brandgefahr - Teil 6-1: Sichtminderung durch Racuh -
Allgemeiner Leitfaden (IEC 60695-6-1:2021)
Essais relatifs aux risques du feu - Partie 6-1: Obscurcissement dû à la fumée -
Recommandations générales (IEC 60695-6-1:2021)
Ta slovenski standard je istoveten z: EN IEC 60695-6-1:2021
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60695-6-1

NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2021
ICS 13.220.99; 29.020 Supersedes EN 60695-6-1:2005 and all of its
amendments and corrigenda (if any)
English Version
Fire hazard testing - Part 6-1: Smoke obscuration - General
guidance
(IEC 60695-6-1:2021)
Essais relatifs aux risques du feu - Partie 6-1: Prüfungen zur Beurteilung der Brandgefahr - Teil 6-1:
Obscurcissement dû à la fumée - Recommandations Sichtminderung durch Racuh - Allgemeiner Leitfaden
générales (IEC 60695-6-1:2021)
(IEC 60695-6-1:2021)
This European Standard was approved by CENELEC on 2021-09-09. 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 60695-6-1:2021 E

European foreword
The text of document 89/1472/CDV, future edition 3 of IEC 60695-6-1, prepared by IEC/TC 89 “Fire
hazard testing” was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022-06-09
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024-09-09
document have to be withdrawn
This document supersedes EN 60695-6-1:2005 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 60695-6-1:2021 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 60695-1-12 NOTE Harmonized as EN IEC 60695-1-12
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
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 60695-1-10 - Fire hazard testing - Part 1–10: Guidance EN 60695-1-10 -
for assessing the fire hazard of
electrotechnical products - General
guidelines
IEC 60695-1-11 - Fire hazard testing - Part 1–11: Guidance EN 60695-1-11 -
for assessing the fire hazard of
electrotechnical products - Fire hazard
assessment
IEC 60695-4 - Fire hazard testing - Part 4: Terminology EN IEC 60695-4 -
concerning fire tests for electrotechnical
products
IEC 60695-6-2 - Fire hazard testing - Part 6–2: Smoke EN IEC 60695-6-2 -
obscuration - Summary and relevance of
test methods
IEC Guide 104 - The preparation of safety publications and - -
the use of basic safety publications and
group safety publications
ISO 13943 2017 Fire safety - Vocabulary EN ISO 13943 2017
ISO/IEC Guide 51 - Safety aspects - Guidelines for their - -
inclusion in standards
IEC 60695-6-1 ®
Edition 3.0 2021-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
HORIZONTAL PUBLICATION
PUBLICATION HORIZONTALE
Fire hazard testing –
Part 6-1: Smoke obscuration – General guidance

Essais relatifs aux risques du feu –

Partie 6-1: Obscurcissement dû à la fumée – Recommandations générales

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.220.99; 29.020 ISBN 978-2-8322-1004-7

– 2 – IEC 60695-6-1:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references. 7
3 Terms, definitions and symbols . 8
3.1 Terms and definitions . 8
3.2 Symbols . 10
4 General aspects of smoke test methods . 11
4.1 Fire scenarios and physical fire models . 11
4.2 Factors affecting smoke production . 12
4.2.1 General . 12
4.2.2 Modes of decomposition . 12
4.2.3 Ventilation and the burning environment . 16
4.2.4 Time and temperature . 16
4.2.5 Removal mechanisms for smoke particles. 16
5 Principles of smoke measurement . 16
5.1 General . 16
5.2 Bouguer's law . 16
5.3 Extinction area . 17
5.4 Log units . 18
5.5 Light sources . 18
5.6 Specific extinction area of smoke. 18
5.7 Mass optical density of smoke . 19
5.8 Visibility . 20
6 Static and dynamic methods . 20
6.1 Static methods . 20
6.1.1 Principles . 20
6.1.2 Extinction area of smoke . 20
6.1.3 Specific optical density of smoke . 21
6.1.4 Prediction of visibility . 21
6.2 Dynamic methods . 21
6.2.1 Principles . 21
6.2.2 Smoke production rate . 21
6.2.3 Total smoke production . 22
6.2.4 SMOGRA index . 22
7 Test methods . 23
7.1 Consideration of test methods . 23
7.2 Selection of test specimen . 24
8 Presentation of data . 24
9 Relevance of data to hazard assessment . 24
Annex A (informative) Calculation of visibility . 27
A.1 General . 27
A.2 Example. 27
Annex B (informative) Relationships between D and some other smoke parameters
s
as measured in ISO 5659-2 [4] . 29

IEC 60695-6-1:2021 © IEC 2021 – 3 –
Annex C (informative) Relationships between per cent transmission, as measured in a
"three metre cube" enclosure, and extinction area . 31
Bibliography . 33

Figure 1 – Different phases in the development of a fire within a compartment . 12
Figure 2 – Attenuation of light by smoke . 17
Figure 3 – Extinction area . 18
Figure 4 – Dynamic smoke measurement . 21
Figure 5 – Example SPRav versus t curve . 23
Figure 6 – SMOGRA curve derived from Figure 5 . 23
Figure 7 – Evaluation and consideration of smoke test methods . 26
Figure A.1 – Visibility (ω) versus extinction coefficient (k) . 27
Figure B.1 – Smoke parameters related to D as measured in ISO 5659-2 . 30
s
Figure C.1 – Extinction area (amount of smoke) related to per cent transmission as
measured in the "three metre cube" . 32

Table 1 – Characteristics of fire stages (from Table 1 in ISO 1970
...