IEC 60695-8-1:2016

Fire hazard testing - Part 8-1: Heat release - General guidance

IEC 60695-8-1:2016 provides guidance on the measurement and interpretation of heat release from electrotechnical products and materials from which they are constructed. Heat release data can be used as part of fire hazard assessment and in fire safety engineering, as described in IEC 60695-1-11 and IEC 60695-1-12. This third edition cancels and replaces the second edition published in 2008. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- a modified Introduction;
- reference to IEC 60695-1-12;
- updated normative references;
- revised terms and definitions;
- new text in 4.2.2, 4.2.3, 6.1 and 6.4, including several mandatory statements and
- mandatory statements in a new Subclause 6.5. This standard is to be used in conjunction with IEC 60695-8-2.
Key words: Fire Hazard, Heat Release, Fire Safety Engineering

Essais relatifs aux risques du feu - Partie 8-1: Dégagement de chaleur - Guide général

L'IEC 60695-8-1:2016 fournit les lignes directrices sur le mesurage et l'interprétation du dégagement de chaleur des produits électrotechniques et des matériaux à partir desquels ils sont constitués. Les données de dégagement de chaleur peuvent être utilisées pour évaluer le danger d'incendie et pour l'ingénierie de la sécurité incendie, comme indiqué dans l'IEC 60695-1-11 et l'IEC 60695-1-12. Cette troisième édition annule et remplace la deuxième édition, parue en 2008. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- introduction modifiée;
- référence à l'IEC 60695-1-12;
- références normatives mises à jour;
- termes et définitions révisés;
- nouveau texte aux 4.2.2, 4.2.3, 6.1 et 6.4, y compris plusieurs déclarations obligatoires;
- déclarations obligatoires dans un nouveau paragraphe 6.5. La présente norme doit être utilisée conjointement avec l'IEC 60695-8-2.
Mots-clés: risques du feu, dégagement de chaleur, l'ingénierie de la sécurité incendie

General Information

• Status: Published
• Publication Date: 14-Nov-2016
• 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
• ICS: 29.060.10 - Wires
• ICS: 55.060 - Spools. Bobbins
• Technical Committee: TC 89 - Fire hazard testing
• Drafting Committee: WG 11 - TC 89/WG 11
• Current Stage: PPUB - Publication issued
• Start Date: 31-Dec-2016
• Completion Date: 15-Nov-2016

Relations

• Revises: IEC 60695-8-1:2008 - Fire hazard testing - Part 8-1: Heat release - General guidance
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60695-8-1 ®
Edition 3.0 2016-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Fire hazard testing –
Part 8-1: Heat release – General guidance

Essais relatifs aux risques du feu –
Partie 8-1: Dégagement de chaleur – Guide général

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IEC 60695-8-1 ®
Edition 3.0 2016-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ

Fire hazard testing –
Part 8-1: Heat release – General guidance

Essais relatifs aux risques du feu –

Partie 8-1: Dégagement de chaleur – Guide général

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.220.40; 29.020 ISBN 978-2-8322-3749-6

– 2 – IEC 60695-8-1:2016  IEC 2016
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Principles of determining heat release . 11
4.1 Complete combustion measured by the oxygen bomb calorimeter . 11
4.2 Incomplete combustion . 12
4.2.1 Measurement techniques . 12
4.2.2 Heat release by oxygen consumption . 12
4.2.3 Heat release by carbon dioxide generation . 13
4.2.4 Heat release by increase of gas temperature . 13
5 Parameters used to report heat release data . 15
5.1 Heat of combustion (gross and net) . 15
5.2 Heat release rate (HRR) . 15
5.3 Heat release (HR) . 16
5.4 Heat release rate per unit area (HRR*) . 16
5.5 Total heat release . 17
5.6 Peak heat release rate . 17
5.7 Time to peak heat release rate . 17
5.8 Effective heat of combustion . 17
5.8.1 Measurement and calculation . 17
5.8.2 Examples. 18
5.9 FIGRA index . 19
5.10 ARHE and MARHE . 20
6 Considerations for the selection of test methods . 22
6.1 Ignition sources . 22
6.2 Type of test specimen . 22
6.3 Choice of conditions . 22
6.4 Test apparatus . 22
6.4.1 General . 22
6.4.2 Small-scale fire test apparatus . 22
6.4.3 Intermediate and large-scale fire test apparatus . 23
6.4.4 Comparison between small-scale and intermediate/large-scale fire test
methods . 23
6.5 Choice of fire tests . 23
7 Relevance of heat release data . 23
7.1 Contribution to fire hazard . 23
7.2 Secondary ignition and flame spread . 23
7.3 Determination of self-propagating fire thresholds . 24
7.4 Probability of reaching flash-over . 24
7.5 Smoke and toxic gas production . 24
7.6 The role of heat release testing in research and development . 24
Bibliography . 25

Figure 1 – Heat release rate (HRR) curve . 16
Figure 2 – Heat release (HR) curve . 16
Figure 3 – Heat release rate per unit area (HRR*) curve . 17
Figure 4 – Mass loss curve . 18
Figure 5 – FIGRA curve derived from Figure 1 . 19
Figure 6 – Illustrative HRR curve . 20
Figure 7 – FIGRA curve derived from Figure 6 . 20
Figure 8 – ARHE curve derived from Figure 1 . 21
Figure 9 – ARHE curve derived from Figure 6 . 21

−1
Table 1 – Relationship between heat of combustion expressed in units of kJ·g of
−1
fuel burned and kJ·g of oxygen consumed for a variety of fuels . 14
−1
Table 2 – Relationship between heat of combustion expressed in units of kJ·g of
−1
fuel burned and kJ·g of oxygen consumed for a variety of insulating liquids . 15

– 4 – IEC 60695-8-1:2016  IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIRE HAZARD TESTING –
Part 8-1: Heat release – General guidance

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
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agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an i
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