IEC 60695-7-3:2011

Fire hazard testing - Part 7-3: Toxicity of fire effluent - Use and interpretation of test results

IEC 60695-7-3:2011 concerns laboratory tests used to measure the toxic components of the fire effluent from either electrotechnical products or materials used in electrotechnical products. It provides guidance on the use and interpretation of results from such tests. It discusses currently available approaches to toxic hazard assessment consistent with the approach of ISO TC 92 SC 3, as set out in ISO 13344, ISO 13571, ISO 16312-1, ISO 16312-2, ISO 19701, ISO 19702 and ISO 19706. It also provides guidance on the use of toxic potency data in fire hazard assessment and on principles which underlie the use of combustibility and toxicological information in fire hazard assessment. The methods described are applicable to data concerning both the incapacitating effects and the lethal effects of fire effluents. This first edition cancels and replaces the second edition of IEC/TS 60695-7-3 published in 2004. It constitutes a technical revision and now has a status of an International Standard. The main changes with respect to the previous edition are listed below:
- change of designation from a Technical Specification to an International Standard;
- the Foreword, Introduction, and Clauses 1, 2 and 3 have been updated;
- expanded in all areas to further clarify the alignment with ISO/TC 92 Fire Safety and in particular with ISO 13344, ISO 13571, ISO/IEC 13943, ISO 16312-1, ISO 16312-2, ISO 19701, ISO 19702 and ISO 19706.
This publication is to be read in conjunction with IEC 60695-7-1:2010 and IEC 60695-7-2:2002.

Essais relatifs aux risques du feu - Partie 7-3: Toxicité des effluents du feu - Utilisation et interprétation des résultats d'essai

La CEI 60695-7-3:2011 concerne les essais en laboratoire utilisés pour mesurer les composants toxiques des effluents du feu provenant des produits électrotechniques ou des matériaux utilisés dans ces produits. Elle fournit des indications pour l'utilisation et l'interprétation des résultats obtenus lors de ces essais. Elle traite des approches actuellement disponibles pour l'évaluation du danger toxique, compatibles avec l'approche du TC 92 SC 3 de l'ISO, telle qu'elle est définie dans l'ISO 13344, l'ISO 13571, l'ISO 16312-1, l'ISO 16312-2, l'ISO 19701, l'ISO 19702 et l'ISO 19706. Elle fournit également des indications pour l'utilisation des données de potentiel toxique dans l'évaluation du danger d'incendie et sur les principes qui mettent l'accent sur l'utilisation des informations sur la combustion et la toxicologie dans l'évaluation du danger d'incendie. Les méthodes décrites sont applicables aux données concernant à la fois les effets incapacitants et les effets létaux des effluents du feu. Cette première édition annule et remplace la deuxième édition de la CEI/TS 60695-7-3, parue en 2004. Elle constitue une révision technique qui conduit au statut de Norme internationale. Les principales modifications par rapport à l'édition précédente sont indiquées ci-dessous:
- changement de désignation d'une spécification technique à une Norme internationale;
- mise à jour de l'avant-propos, de l'Introduction et des Articles 1, 2 et 3;
- la norme a été étoffée dans tous les domaines, afin de préciser son alignement sur les travaux du TC 92 de l'ISO, Sécurité au feu, et en particulier sur l'ISO 13344, l'ISO 13571, l'ISO/CEI 13943, l'ISO 16312-1, l'ISO 16312-2, l'ISO 19701, l'ISO 19702 et l'ISO 19706.
Cette publication doit être lue conjointement avec la CEI 60695-7-1:2010 et la CEI 60695-7-2:2002.

General Information

• Status: Published
• Publication Date: 29-Aug-2011
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 13.220.40 - Ignitability and burning behaviour of materials and products
• ICS: 29.020 - Electrical engineering in general
• Technical Committee: TC 89 - Fire hazard testing
• Drafting Committee: WG 11 - TC 89/WG 11
• Current Stage: PPUB - Publication issued
• Start Date: 15-Sep-2011
• Completion Date: 30-Aug-2011

Relations

• Replaces: IEC TS 60695-7-3:2004 - Fire hazard testing - Part 7-3: Toxicity of fire effluent - Use and interpretation of test results
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60695-7-3 ®
Edition 1.0 2011-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ

Fire hazard testing –
Part 7-3: Toxicity of fire effluent – Use and interpretation of test results

Essais relatifs aux risques du feu –
Partie 7-3: Toxicité des effluents du feu – Utilisation et interprétation des
résultats d'essai
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IEC 60695-7-3 ®
Edition 1.0 2011-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ

Fire hazard testing –
Part 7-3: Toxicity of fire effluent – Use and interpretation of test results

Essais relatifs aux risques du feu –
Partie 7-3: Toxicité des effluents du feu – Utilisation et interprétation des
résultats d'essai
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX V
ICS 13.220.40; 29.020 ISBN 978-2-88912-629-3

– 2 – 60695-7-3 © IEC:2011
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references. 7
3 Terms and definitions . 8
4 Principles of toxic hazard assessment . 14
4.1 General . 14
4.2 Exposure dose. 15
4.3 Determination of concentration-time data . 16
4.4 Asphyxiants and the fractional effective dose, FED . 17
4.4.1 General . 17
4.4.2 Properties of the FED . 17
4.4.3 Uses of the FED . 18
4.5 Irritants and the fractional effective concentration, FEC . 18
4.6 Carbon dioxide . 19
4.7 Oxygen vitiation . 19
4.8 Heat stress . 19
4.9 Effects of stratification and transport of fire atmospheres . 19
5 Methods of toxic hazard assessment . 19
5.1 General approach . 19
5.2 Equations used to predict death . 19
5.2.1 Simple toxic gas model . 19
5.2.2 The N-gas model . 20
5.2.3 Hyperventilatory effect of carbon dioxide . 20
5.2.4 Lethal toxic potency values . 20
5.2.5 Mass loss model . 21
5.3 Equations used to predict incapacity . 21
5.3.1 Asphyxiant gas model . 21
5.3.2 Irritant gas model . 22
5.3.3 Mass loss model . 22
6 Toxic potency values . 22
6.1 Generic values of toxic potency . 22
6.2 Toxic potency values obtained from chemical analyses . 22
6.3 Toxic potency values obtained from animal tests . 22
7 Limitations on the interpretation of toxicity test results . 22
8 Effluent components to be measured . 23
8.1 Minimum reporting . 23
8.2 Additional reporting . 23
8.2.1 Gaseous fire effluent components . 23
8.2.2 Airborne particulates . 24
Annex A (informative) Guidance for the use of LC values . 25
Annex B (informative) A simple worked example to illustrate the principles of a toxic
hazard analysis . 28
Annex C (informative) F values for irritants . 32
Bibliography . 33

60695-7-3 © IEC:2011 – 3 –
Figure 1 – Exposure dose as a function of time and concentration . 15
Figure 2 – Time dependent components of fire hazard . 16
Figure 3 – Total FED and contributors, as a function of time . 18
Figure B.1 – Flame spread rate for materials A and B . 29
Figure B.2 – Relative toxic hazard of two materials – time to lethality, i.e. FED ≥ 1 . 31

Table 1 – Some toxic potency values . 20
Table 2 – Combustion products . 24
Table B.1 – Example FED calculation data for material A . 30
Table B.2– Example FED calculation data for material B . 30
Table C.1 – F values for irritants . 32

– 4 – 60695-7-3 © IEC:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIRE HAZARD TESTING –
Part 7-3: Toxicity of fire effluent –
Use and interpretation of test results

FOREWORD
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