IEC TR 60695-8-2:2008

IEC/TR 60695-8-2
Edition 2.0 2008-01
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
Fire hazard testing –
Part 8-2: Heat release – Summary and relevance of test methods

Essais relatifs aux risques du feu –
Partie 8-2: Dégagement de chaleur – Résumé et pertinence des méthodes
d'essais
IEC/TR 60695-8-2:2008
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IEC/TR 60695-8-2
Edition 2.0 2008-01
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
Fire hazard testing –
Part 8-2: Heat release – Summary and relevance of test methods

Essais relatifs aux risques du feu –
Partie 8-2: Dégagement de chaleur – Résumé et pertinence des méthodes
d'essais
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
S
CODE PRIX
ICS 13.220.40; 29.020 ISBN 2-8318-9578-2

– 2 – TR 60695-8-2 © IEC:2008
CONTENTS
FOREWORD.3
INTRODUCTION.5

1 Scope.6
2 Normative references.6
3 Terms and definitions .7
4 Summary of test methods .9
4.1 Measurement of complete combustion .10
4.1.1 The bomb calorimeter .10
4.2 Measurements of incomplete combustion.11
4.2.1 Cone calorimeter .11
4.2.2 The Ohio State University calorimeter .12
4.2.3 Vertical cable ladder tests .13
4.2.4 SBI test .15
4.2.5 Horizontal cable ladder test.17
4.2.6 Open calorimetry fire tests .19

Bibliography .20

Table 1 – Summary and comparison of vertical cable ladder tests.16

TR 60695-8-2 © IEC:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIRE HAZARD TESTING –
Part 8-2: Heat release –
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-
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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
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5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
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6) All users should ensure that they have the latest edition of this publication.
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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.
The main task of IEC technical committees is to prepare International Standards. However, a
technical committee may propose the publication of a technical report when it has collected
data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC 60695-8-2, which is a technical report, has been prepared by IEC technical committee 89:
Fire hazard testing.
This second edition cancels and replaces the first edition of IEC 60695-8-2/TS published in
2000 and constitutes a technical revision.
The main changes with respect to the previous edition are listed below:
– editorial changes throughout;

– 4 – TR 60695-8-2 © IEC:2008
– revised terms and definitions;
– introduction of a new Subclause 4.1.1 – Bomb calorimeter;
– introduction of a new Table 1 dealing with vertical ladder tests;
– introduction of a new Subclause 4.2.4 – SBI test method;
– introduction of a new Subclause 4.2.6 – Open calorimetry fire tests.
It has the status of a basic safety publication in accordance with IEC Guide 104 and ISO/IEC
Guide 51.
This technical report is to be used in conjunction with IEC 60695-8-1.
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
89/808/DTR 89/830A/RVC
Full information on the voting for the approval of this technical report can be found in the report
on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 60695 series, under the general title Fire hazard testing, can be
found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until the
maintenance result 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.
TR 60695-8-2 © IEC:2008 – 5 –
INTRODUCTION
In the design of any 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 to acceptable levels the
potential risks of fire even in the event of foreseeable abnormal use, malfunction or failure.
)
IEC 60695-1-10 [1] , together with its companion, IEC 60695-1-11 [2] , provide guidance on
how this is to be accomplished.
The primary aims are as follows:
1) to prevent ignition caused by an electrically energized component part, and
2) in the event of ignition, to confine any resulting fire within the bounds of the enclosure of
the electrotechnical product.
Secondary aims include the minimization of any flame spread beyond the product’s enclosure
and the minimization of harmful effects of fire effluents including heat, smoke and toxic or
corrosive combustion products.
Fires involving electrotechnical products can also be initiated from external non-electrical heat
sources. Considerations of this nature are dealt with in the overall risk assessment.
Fires are responsible for creating hazards to life and property as a result of the generation of
heat (thermal hazard), toxic and/or corrosive compounds and obscuration of vision due to
smoke. Fire risk increases as the heat released increases, possibly leading to a flash-over fire.
One of the most important measurements in fire testing is the measurement of heat release
and it is used as an important factor in the determination of fire hazard; it is also used as one
of the parameters in fire safety engineering calculations.
The measurement and use of heat release data, together with other fire test data, can be used
to reduce the likelihood of (or the effects of) fire, even in the event of foreseeable abnormal
use, malfunction or failure of electrotechnical products.
When a material is heated by some external source, fire effluent can be gene
...