IEC TS 60695-11-40:2021

IEC TS 60695-11-40 ®
Edition 2.0 2021-06
TECHNICAL
SPECIFICATION
BASIC SAFETY PUBLICATION
Fire hazard testing –
Part 11-40: Test flames – Confirmatory tests – Guidance

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IEC TS 60695-11-40 ®
Edition 2.0 2021-06
TECHNICAL
SPECIFICATION
BASIC SAFETY PUBLICATION
Fire hazard testing –
Part 11-40: Test flames – Confirmatory tests – Guidance

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.220.40; 29.020 ISBN 978-2-8322-9862-6

– 2 – IEC TS 60695-11-40:2021 © IEC 2021
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Test flames . 8
4.1 General . 8
4.2 Diffusion flames . 8
4.3 Pre-mixed flames . 8
4.4 Standardized test flames . 8
4.5 Critical parameters . 9
5 Burners and fuel gases . 9
5.1 Diffusion flame burners . 9
5.2 Pre-mixed burners . 9
5.2.1 Metered air pre-mixed burners . 9
5.2.2 Venturi air pre-mixed burners . 10
5.3 Flame stabilizer . 10
5.4 Fuel gases . 10
6 Confirmatory test hardware . 10
6.1 General . 10
6.2 Copper blocks . 10
6.2.1 Material . 10
6.2.2 Mass . 11
6.2.3 Geometry. 11
6.3 Thermocouple . 11
7 Confirmatory test procedure . 11
7.1 General . 11
7.2 Copper block positioning . 11
7.3 Test temperature ranges . 12
7.4 Test time ranges . 12
7.5 Purpose of the confirmatory test . 12
Annex A (informative) Copper block calorimetry dynamics and theory . 14
A.1 Fundamentals of thermal dynamics of copper block . 14
A.2 Calculation method for obtaining parameters A, B and C. 15
A.3 Summary and conclusions . 18
Bibliography . 20

Figure 1 – Positioning of the copper block . 12
Figure A.1 – Results using data from Table A.1 . 18
Figure A.2 – Parabolic fit of data to 800 °C . 19

Table 1 – Standardized test flames with confirmatory tests . 9
Table A.1 – Typical data for a nominal 500 W methane flame . 14
Table A.2 – Parabolic fit to initial data . 15
Table A.3 – Calculated best fit data . 17

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIRE HAZARD TESTING –
Part 11-40: Test flames –
Confirmatory tests – 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 this end and
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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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.
IEC TS 60695-11-40 has been prepared by IEC technical committee 89: Fire hazard testing. It
is a Technical Specification.
It has the status of a basic safety publication in accordance with IEC Guide 104 and
ISO/IEC Guide 51.
The text of this Technical Specification is based on the following documents:
DTS Report on voting
89/1498/DTS 89/1512/RVDTS
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Technical Specification is English.

– 4 – IEC TS 60695-11-40:2021 © IEC 2021
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
This second edition cancels and replaces the first edition published in 2002. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) former Clause 4 split into updated/rearranged new Clause 4 and Clause 5;
b) Table 1 updated and moved to new Clause 4;
c) former Clause 5 transformed to Clause 6;
d) former Clause 6 transformed to Clause 7;
e) former Clause7, Clause 8 and Clause 9 combined into an updated/rearranged new Annex A;
and
f) all figures were updated.
This Technical Specification is to be used in conjunction with IEC 60695-11-2, IEC 60695-11-3,
IEC 60695-11-4 and IEC 60695-11-5.
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.
Part 11 consists of the following parts:
Part 11-2: Test flames – 1 kW nominal pre-mixed flame – Apparatus, confirmatory test
arrangement and guidance
Part 11-3: Test flames – 500 W flames – Apparatus and confirmational test methods
Part 11-4: Test flames – 50 W flame – Apparatus and confirmational test method
Part 11-5: Test flames – Needle-flame test method – Apparatus, confirmatory test
arrangement and guidance
Part 11-10: Test flames – 50 W horizontal and vertical flame test methods
Part 11-11: Test flames – Determination of the characteristic heat flux for ignition from a non-
contacting flame source
Part 11-20: Test flames – 500 W flame test methods
Part 11-30: Test flames – History and development from 1979 to 1999
Part 11-40: Test flames – Confirmatory tests – Guidance
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific docume
...