IEC 60695-11-3:2012

IEC 60695-11-3 ®
Edition 1.0 2012-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Fire hazard testing –
Part 11-3: Test flames – 500 W flames – Apparatus and confirmational test
methods
Essais relatifs aux risques du feu –
Partie 11-3: Flammes d'essai – Flamme de 500 W – Appareillage et méthodes
d'essai de vérification
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IEC 60695-11-3 ®
Edition 1.0 2012-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ

Fire hazard testing –
Part 11-3: Test flames – 500 W flames – Apparatus and confirmational test

methods
Essais relatifs aux risques du feu –

Partie 11-3: Flammes d'essai – Flamme de 500 W – Appareillage et méthodes

d'essai de vérification
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX U
ICS 13.220.40; 29.020 ISBN 978-2-83220-258-6

– 2 – 60695-11-3 © IEC:2012
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Method A – Production of a standardized 500 W nominal test flame based on
existing hardware . 8
4.1 Requirements . 8
4.2 Apparatus and fuel . 8
4.2.1 Burner . 8
4.2.2 Flowmeter . 8
4.2.3 Manometer . 9
4.2.4 Control valve . 9
4.2.5 Copper block . 9
4.2.6 Thermocouple. 9
4.2.7 Temperature/time indicating/recording devices . 9
4.2.8 Fuel gas . 9
4.2.9 Laboratory fumehood/chamber . 9
4.3 Production of the test flame . 10
4.4 Confirmation of the test flame . 10
4.4.1 Principle . 10
4.4.2 Procedure . 10
4.4.3 Verification . 11
5 Method C – Production of a standardized 500 W nominal test flame based on non-
adjustable hardware . 11
5.1 Requirements . 11
5.2 Apparatus and fuel . 11
5.2.1 Burner . 11
5.2.2 Flowmeters . 11
5.2.3 Manometers . 12
5.2.4 Control valves . 12
5.2.5 Copper block . 12
5.2.6 Thermocouple. 12
5.2.7 Temperature/time indicating/recording devices . 12
5.2.8 Fuel gas . 12
5.2.9 Air supply . 12
5.2.10 Laboratory fumehood/chamber . 13
5.3 Production of the test flame . 13
5.4 Confirmation of the test flame . 13
5.4.1 Principle . 13
5.4.2 Procedure . 13
5.4.3 Verification . 14
6 Classification and designation . 14
Annex A (normative) Test arrangements – Method A . 17
Annex B (normative) Test arrangement – Method C . 21

60695-11-3 © IEC:2012 – 3 –
Annex C (informative) Recommended arrangements for the use of either of the test
flames . 26
Annex D (informative) Test arrangements for tests on equipment . 27
Annex E (informative) Test arrangements for tests on material . 28
Bibliography . 29

Figure 1 – Flame dimensions . 15
Figure 2 – Copper block . 15
Figure 3 – Flame height gauge . 16
Figure A.1 – General assembly and details . 18
Figure A.2 – Supply arrangement for burner (example) . 19
Figure A.3 – Confirmatory test arrangement . 20
Figure B.1 – Burner, method C – General assembly . 21
Figure B.2 – Burner details – Burner barrel, O-ring, air manifold and air supply tube. 22
Figure B.3 – Burner details – Gas supply tube and gas jet . 23
Figure B.4 – Burner details – Burner base and elbow block. 23
Figure B.5 – Supply arrangement for burner (example) . 24
Figure B.6 – Confirmatory test arrangement . 25
Figure D.1 – Examples of test arrangements . 27
Figure E.1 – Examples of test arrangements . 28

– 4 – 60695-11-3 © IEC:2012
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIRE HAZARD TESTING –
Part 11-3: Test flames – 500 W flames –
Apparatus and confirmational 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-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
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
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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.
International Standard IEC 60695-11-3 has been prepared by IEC technical committee 89:
Fire hazard testing.
This first edition of IEC 60695-11-3 cancels and replaces the second edition of
IEC/TS 60695-11-3 published in 2004. It constitutes a technical revision and now has the
status of an International Standard.
It has the status of a basic safety publication in accordance with IEC Guide 104 and
ISO/IEC Guide 51.
The main changes with respect to the previous edition are the integration of minor editorial
and technical changes throughout the text.

60695-11-3 © IEC:2012 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
89/1113/FDIS 89/1117/RVD
Full information on the voting for the approval of this standard 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.
IEC 60695-11 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 publication will remain unchanged until
the stability 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.
– 6 – 60695-11-3 © IEC:2012
INTRODUCTION
The best method for testing electrotechnical products with regard to fire hazard is to duplicate
exactly the conditions occurring in practice. In most instances, this is not possible.
Accordingly, for practical reasons, the testing of electrotechnical products with regard to fire
hazard is best conducted by simulating as closely as possible the actual effects occurring in
practice.
Work initiated by ACOS resulted in a series of standards that make available standardized
test flames covering a range of powers for the use of all product committees needing such
test flames. A needle flame is described in IEC 60695-11-5, a 50 W flame is described in
IEC 60695-11-4, and a 1 kW flame is described in IEC 60695-11-2.
This international standard provides a description of the apparatus required to produce either
of two 500 W test flames, and also provides a description of a calibration procedure to check
that the test flame produced meets given requirements. Guidance on confirmatory tests for
test flames is given in IEC 60695-11-40.
Four 500 W test flame methods were originally specified in Edition 1 of IEC/TS 60695-11-3,
with the intention that users would determine a ranking preference. This process has resulted
in two of these flame methods, B and D, being withdrawn, as shown below:

500 W test flame Approximate
Flame type Gas
method flame height / mm
A Pre-mixed Methane 125
B Withdrawn
C Pre-mixed Methane or propane 125
D Withdrawn
Method A was first published in 1994 and was based on existing hardware. The flame is
produced by burning methane, and the method makes use of a more tightly specified version
of a burner that was used in some countries for many years.
Method C is based on non-adjustable hardware that has been specifically developed to
produce a highly repeatable and stable test flame. The flame is produced by burning either
methane or propane.
Both methods have been developed as technical enhancements of previous technology.

60695-11-3 © IEC:2012 – 7 –
FIRE HAZARD TESTING –
Part 11-3: Test flames – 500 W flames –
Apparatus and confirmational test methods

1 Scope
This part of IEC 60695-11 provides detailed requirements for the production of either of two
500 W nominal, pre-mixed type test flames. The approximate overall height of each flame is
125 mm.
Two methods of producing a test flame are described: Method A uses methane. Method C can
use either methane or propane.
This basic safety publication is intended for use by technical committees in the preparation of
standards 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. The requirements, test
methods or test conditions of this basic safety publication will not apply unless specifically
referred to or included in the relevant publications.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60584-1:1995, Thermocouples – Part 1: Reference tables
IEC 60584-2 am.1 ed.1:1989, Amendment 1, Thermocouples – Part 2: Tolerances
IEC Guide 104:1997, The preparation of safety publications and the use of basic safety
publications and group safety publications
ISO/IEC Guide 51:1999, Safety aspects – Guidelines for their inclusion in standards
ISO/IEC 13943:2008, Fire safety – Vocabulary
ASTM-B187/B187M-06, Standard Specification for Copper, Bus Bar, Rod, and Shapes and
General Purpose Rod, Bar, and Shapes

– 8 – 60695-11-3 © IEC:2012
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC 13945, as well
as the following definition apply.
3.1
standardized 500 W nominal test flame
test flame that conforms to this international standard and meets all of the requirements given
in Clause 4 and Clause 6
4 Method A – Production of a standardized 500 W nominal test flame based on
existing hardware
4.1 Requirements
A standardized 500 W nominal test flame, according to this method, is one that is:
– produced using hardware according to Figures A.1 and A.2,
– supplied with methane gas of purity not less than 98 % at a flow rate equivalent to
965 ml/min ± 30 ml/min at 23 °C, 0,1 MPa , and at a back pressure of 125 mm ± 5 mm
water, using the arrangements of Figure A.2.
The flame shall be symmetrical, stable and give a result of 54 s ± 2 s in the confirmatory test
described in 4.4.
The confirmatory test arrangement shown in Figure A.3 shall be used.
The approximate dimensions of the flame (see Figure 1), when measured in the laboratory
fumehood/chamber using the gauge as described in Figure 3, should be:
– height of inner blue cone: 40 mm;
– overall height of flame: 125 mm.
4.2 Apparatus and fuel
4.2.1 Burner
The burner shall be in accordance with Figure A.1.
NOTE The burner tube, gas injector and needle valve are removable for cleaning purposes. Care should be taken
on re-assembly that the needle valve tip is not damaged and that the needle valve and valve seat (gas injector) are
correctly aligned.
4.2.2 Flowmeter
The flowmeter shall be appropriate for the measurement of the gas flow rate of 965 ml/min at
23 °C, 0,1 MPa to a tolerance of ± 2 %.
NOTE A mass flowmeter is the preferred means of controlling accurately the input flow rate of fuel to the burner.
Other methods may be used if they can show equivalent accuracy.
___________
When corrected from the measurements taken under actual conditions of use.

60695-11-3 © IEC:2012 – 9 –
4.2.3 Manometer
The manometer shall be appropriate for the measurement of pressure in the range of 0 kPa
to 7,5 kPa. A water manometer may be used for this purpose. It should be adapted to read
0 kPa to 7,5 kPa.
NOTE A manometer is required in conjunction with a mass flowmeter in order to maintain the required back
pressure.
4.2.4 Control valve
A control valve is required to set the gas flow rate.
4.2.5 Copper block
The copper block shall be 9 mm in diameter, of mass 10,00 g ± 0,05 g in the fully machined
but undrilled state as shown in Figure 2.
There is no verification method for the copper block. Laboratories are encouraged to maintain
a standard reference unit, a secondary standard reference unit and a working unit, cross-
comparing them as appropriate to verify the working system.
4.2.6 Thermocouple
A mineral insulated, metal sheathed fine-wire thermocouple with an insulated junction, is used
for measuring the temperature of the copper block. The thermocouple shall be Class 1 as
defined in IEC 60584-2. It shall have an overall nominal diameter of 0,5 mm and wires of, for
example, NiCr and NiAl (type K as defined in IEC 60584-1) with the welded point located
inside the sheath. The sheath shall consist of a metal resistant to continuous operation at a
temperature of at least 1 050 °C. Thermocouple tolerances shall be in accordance with
IEC 60584-2, Class 1.
NOTE A sheath made from a nickel-based, heat resistant alloy (such as Inconel 600 ) will satisfy the above
requirements.
The preferred method of fastening the thermocouple to the copper block, after first ensuring
that the thermocouple is inserted to the full depth of the hole, is by compressing the copper
around the thermocouple to retain it without damage, as shown in Figure A.3.
4.2.7 Temperature/time indicating/recording devices
The temperature/time indicating/recording devices shall be appropriate for the measurement
of the time for the copper block to heat up from 100 °C ± 2 °C to 700 °C ± 3 °C with a
tolerance on the measured time of ± 0,5 s.
4.2.8 Fuel gas
The fuel gas shall be methane with a purity of not less than 98 %.
4.2.9 Laboratory fumehood/chamber
The laboratory fumehood/chamber shall have an inside volume of at least 0,75 m . The
chamber shall permit observation of tests in progress and shall provide a draught-free
environment, whilst allowing normal thermal circulation of air past the test specimen during
burning. The inside surfaces of the walls shall be of a dark colour. When a lux meter, facing
___________
This information is given for the convenience of users of this international standard and does not constitute an
endorsement by the IEC of the product named. Equivalent products may be used if they can be shown to lead
to the same results.
– 10 – 60695-11-3 © IEC:2012
towards the rear of the chamber, is positioned in place of the test flame, the recorded light
level shall be less than 20 lx. For safety and convenience, it is desirable that this enclosure
(which can be completely closed) is fitted with an extraction device, such as an exhaust fan,
to remove products of combustion which may be toxic. If fitted, the extraction device shall be
turned off during the test and turned on immediately after the test to remove the fire effluents.
A positive closing damper may be needed.
NOTE 1 The amount of oxygen available to support combustion of the test specimen is naturally important for the
conduct of flame tests. For tests conducted by this method when burning times are prolonged, chambers having an
inside volume of 0,75 m may not be sufficient to produce accurate results.
NOTE 2 Placing a mirror in the chamber, to provide a rear view of the test specimen, has been found useful.
4.3 Production of the test flame
Set up the burner supply arrangement according to Figure A.2 ensuring leak-free connections
and place the burner in the laboratory fumehood/chamber.
Ignite the gas and adjust the gas flow and back pressure to the required values. The air inlet
shall be adjusted until the height of the inner blue cone is approximately 40 mm when
measured using the gauge described in Figure 3, and then locked in position with the lock nut.
The flame shall appear stable and symmetrical on examination.
4.4 Confirmation of the test flame
4.4.1 Principle
The time taken for the temperature of the copper block, described in Figure 2, to increase
from 100 °C ± 2 °C to 700 °C ± 3 °C shall be 54 s ± 2 s, when the flame confirmatory test
arrangement of Figure A.3 is used.
4.4.2 Procedure
Set up the burner supply and confirmatory test arrangement according to Figure A.3 in the
laboratory fume-hood/chamber, ensuring leak-free gas connections.
Temporarily remove the burner away from the copper block to ensure that there is no
influence of the flame on the copper block during the preliminary adjustment of the gas flow,
gas back pressure and air inlet.
Ignite the gas and adjust the gas flow and back pressure to the required values. Adjust the air
inlet until the height of the inner blue cone is 40 mm ± 2 mm, when measured using the gauge
described in Figure 3. Lock the air inlet in position with the lock nut.
Ensure that the overall height of the flame, measured using the gauge described in Figure 3,
is approximately 125 mm and that the flame is symmetrical.
Wait for a period of at least 5 min to allow the burner conditions to reach equilibrium. Check
that the gas flow and back pressure and the blue cone height are within the prescribed limits.
With the temperature/time indicating/recording devices operational, re-position the burner
under the copper block. Determine the time for the temperature of the copper block to
increase from 100 °C ± 2 °C to 700 °C ± 3 °C. If the time is 54 s ± 2 s, repeat the procedure
two additional times until three successive determinations are within specification. Allow the
copper block to cool naturally in air to below 50 °C between determinations. If the time of any
determination is not 54 s ± 2 s, adjust the flame accordingly, allow the flame to reach
equilibrium, and restart the procedure.

60695-11-3 © IEC:2012 – 11 –
NOTE At temperatures above 700 °C, the thermocouple can easily be damaged, therefore it is advisable to
remove the burner immediately after reaching 700 °C.
If the copper block has not been used before, make a preliminary run to condition the copper
block surface. Discard the result.
4.4.3 Verification
The flame is confirmed and may be used for test purposes if the results of three successive
determinations are within the range 54 s ± 2 s.
5 Method C – Production of a standardized 500 W nominal test flame based on
non-adjustable hardware
5.1 Requirements
A standardized 500 W nominal test flame, according to this method, is one that is produced
using hardware according to Figures B.1 to B.4 (see Annex B). The burner is supplied with
either
• methane gas of purity not less than 98 % at a flow rate equivalent to 965 ml/min
± 30 ml/min at 23 °C, 0,1 MPa , and air at a flow rate equivalent to 6,3 l/min ±
0,1 l/min at 23 °C, 0,1 MPa using the arrangement of Figure B.5;
NOTE 1 The expected back pressure for the gas is in the range of 110 mm to 170 mm of water and in the
range of 20 mm to 40 mm of water for the air.
• or propane gas of purity not less than 98 % at a flow rate equivalent to 380 ml/min ±
15 ml/min at 23 °C, 0,1 MPa , and air at a flow rate equivalent to 5,9 l/min ± 0,1 l/min
at 23 °C, 0,1 MPa using the arrangement of Figure B.5.
NOTE 2 The expected back pressure for the gas is in the range of 135 mm to 205 mm of water and in the
range of 15 mm to 35 mm of water for the air.
The flame shall be symmetrical, stable and give a result of 54 s ± 2 s in the confirmatory test
as described in 5.4.
The confirmatory test arrangement shown in Figure B.6 shall be used.
The approximate dimensions of the flame (see Figure 1), when measured in the laboratory
fume-hood/chamber using the gauge described in Figure 3, should be:
– height of inner blue cone: 40 mm;
– overall height of flame: 125 mm.
5.2 Apparatus and fuel
5.2.1 Burner
The burner shall be in accordance with Figures B.1 to B.4.
5.2.2 Flowmeters
The flowmeters shall be appropriate
– for the measurement of methane and/or propane gas flow rates of 965 ml/min and
380 ml/min, respectively, at 23 °C, 0,1 MPa to a tolerance of ± 2 %, and
___________
When corrected from the measurements taken under actual conditions of use.

– 12 – 60695-11-3 © IEC:2012
– for the measurement of air flow rates of 6,3 l/min and/or 5,9 l/min, respectively, at 23 °C,
0,1 MPa to a tolerance of ± 2 %.
NOTE Mass flowmeters are the preferred means of controlling accurately the input flow rates of fuel and air to the
burner. Other methods may be used if they can show equivalent accuracy.
5.2.3 Manometers
Two manometers are required, appropriate for the measurement of pressures in the range of
0 kPa to 7,5 kPa. Water manometers may be used for this purpose. They should be adapted
to read 0 kPa to 7,5 kPa.
NOTE Manometers are not required when mass flowmeters are used.
5.2.4 Control valves
Two control valves are required to set the gas and air flow rates.
5.2.5 Copper block
The copper block shall be 9,0 mm in diameter, with a mass of 10,00 g ± 0,05 g in the fully
machined but undrilled state, as shown in Figure 2.
There is no verification method for the copper block. Laboratories are encouraged to maintain
a standard reference unit, a secondary standard reference unit and a working unit, cross-
comparing them as appropriate to verify the working system.
5.2.6 Thermocouple
A mineral insulated, metal sheathed fine-wire thermocouple with an insulated junction, is used
for measuring the temperature of the copper block. The thermocouple shall be Class 1 as
defined in IEC60584-2. It shall have an overall nominal diameter of 0,5 mm and wires of, for
example, NiCr and NiAl (type K as defined in IEC 60584-1) with the welded point located
inside the sheath. The sheath shall consist of a metal resistant to continuous operation at a
temperature of at least 1 050 °C. Thermocouple tolerances shall be in accordance with
IEC 60584-2, class 1.
NOTE A sheath made from a nickel-based, heat resistant alloy (such as Inconel 600) will satisfy the above
requirements.
The preferred method of fastening the thermocouple to the copper block, after first ensuring
that the thermocouple is inserted to the full depth of the hole, is by compressing the copper
around the thermocouple to retain it without damage, as shown in Figure B.6.
5.2.7 Temperature/time indicating/recording devices
The temperature/time indicating/recording devices shall be appropriate for the measurement
of the time for the copper block to heat up from 100 °C ± 2 °C to 700 °C ± 3 °C with a
tolerance on the measured time of ± 0,5 s.
5.2.8 Fuel gas
In cases of dispute, methane (see 5.1) shall be used with a purity of not less than 98 %.
5.2.9 Air supply
The air shall be essentially free of oil and water.

60695-11-3 © IEC:2012 – 13 –
5.2.10 Laboratory fumehood/chamber
The laboratory fumehood/chamber shall have an inside volume of at least 0,75 m . The
chamber shall permit observation of tests in progress and shall provide a draught-free
environment, whilst allowing normal thermal circulation of air past the specimen during
burning. The inside walls of the chamber shall be of a dark colour. When a lux meter facing
towards the rear of the chamber is positioned in place of the test flame, the recorded light
level shall be less than 20 lx. For safety and convenience, it is desirable that this enclosure
(which can be completely closed) is fitted with an extraction device, such as an exhaust fan,
to remove products of combustion which may be toxic. If fitted, the extraction device shall be
turned off during the test and turned on immediately after the test to remove the fire effluents.
A positive closing damper may be needed.
NOTE 1 The amount of oxygen available to support combustion of the test specimen is naturally important for the
conduct of this flame test. For tests conducted by this method when burning times are prolonged, chambers having
an inside volume of 0,75 m may not be sufficient to produce accurate results.
NOTE 2 Placing a mirror in the chamber, to provide a rear view of the test specimen, has been found useful.
5.3 Production of the test flame
Set up the burner supply arrangement according to Figure B.5, ensuring leak-free gas
connections, and place the burner in the laboratory fumehood/chamber.
Ignite the mixture and adjust the gas and air flow rates to the required values.
The height of the inner blue cone and the overall height of the flame shall be as described in
5.1. The flame shall appear stable and symmetrical on examination.
5.4 Confirmation of the test flame
5.4.1 Principle
The time taken for the temperature of the copper block, described in Figure 2, to increase
from 100 °C ± 2 °C to 700 °C ± 3 °C shall be 54 s ± 2 s, when the flame confirmatory test
arrangement of Figure B.6 is used.
5.4.2 Procedure
Set up the burner supply confirmatory test arrangement according to Figure B.6 in the
laboratory fumehood/chamber, ensuring leak-free gas and air connections.
Temporarily remove the burner away from the copper block to ensure there is no influence of
the flame on the copper block during the preliminary adjustment of the gas and air flow rates
Ignite the gas and adjust the gas and air flow rates to the required values. Ensure that the
dimensions of the flame, when measured using the gauge described in Figure 3, are within
the required limits, and that the flame is symmetrical. Wait for a period of at least 5 min to
allow the burner conditions to reach equilibrium. Measure the gas and air flow rates and
determine that they are within the required limits.
With the temperature/time indicating/recording devices operational, re-position the burner
under the copper block.
Determine the time for the temperature of the copper block to increase from 100 °C ± 2 °C to
700 °C ± 3 °C. If the time is 54 s ± 2 s, repeat the procedure two additional times until three
successive determinations are within specification. Allow the copper block to cool naturally in
air to below 50 °C between determinations. If the time of any determination is not 54 s ± 2 s,
adjust the flame accordingly, allow the flame to reach equilibrium, and restart the procedure.

– 14 – 60695-11-3 © IEC:2012
NOTE At temperatures above 700 °C, the thermocouple can easily be damaged, therefore it is advisable to remove
the burner immediately after reaching 700 °C.
If the copper block has not been used before, make a preliminary run to condition the copper
block surface. Discard the result.
5.4.3 Verification
The flame is confirmed and may be used for test purposes if the results of three successive
determinations are within the range 54 s ± 2 s.
6 Classification and designation
Apparatus that conforms with the requirements of this international standard and produces a
500 W nominal test flame according to either Method A or Method C may be labelled:
"500 W nominal test flame apparatus – Method A, conforming to IEC 60695-11-3."
or
"500 W nominal test flame apparatus – Method C, conforming to IEC 60695-11-3."

60695-11-3 © IEC:2012 – 15 –
IEC  1443/12
Figure 1 – Flame dimensions
Dimensions in millimetres
∅ 9 ± 0,01
Hole drilled ∅ 0,5
45°± 0,5° 45°± 0,5°
Copper block polished all over
IEC  001/2000
Tolerances on linear dimensions: ± 0,1 mm, unless otherwise stated.
Tolerances on angular dimensions: ± 30 min, unless otherwise stated.
Material: high conductivity electrolytic copper Cu-ETP UNS C 11000 (see ASTM-B187/B187M-06)
Mass: 10 g ± 0,05 g before drilling.

Figure 2 – Copper block
6 ± 0,02
Height of inner
blue cone
(40 mm)
19,14 ± 0,02
Overall height of flame (125 mm)
20,64 ± 0,04
– 16 – 60695-11-3 © IEC:2012
Dimensions in millimetres
30°
30°
20°
30°
Material 1 mm to 1,5 mm steel plate
Thermally insulating strips, rivetted in place
IEC  002/2000
Tolerances on linear dimensions: ± 1 mm, unless otherwise stated.
Tolerances on angular dimensions: ± 5°, unless otherwise stated.
Figure 3 – Flame height gauge
38 ± 0,5 20 ± 0,5
4 ± 0,5
135 ± 0,5
60695-11-3 © IEC:2012 – 17 –
Annex A
(normative)
Test arrangements – Method A
Dimensions in millimetres
∅ 0,9 ± 0,03
∅
9,5 ± 0,3 Internal diameter
Orifice opening
∅ 8
∅ 4 ± 0,5
Maximum flat
40°
top 0,4
∅ 10 ± 0,2 × 2 deep 70°
Minimum area
of air inlets
45°
225 mm
A A
14,5 A/F
Approx.∅ 25
Valve seat
Thread to suit 6
main body
Thread to suit
lock nut and
main body
∅ 19,05 (0,75 in)
nominal outer
diameter
∅ 18
∅ 3
Internal diameter
Drill and tap
3,4
Needle valve
3 slots equally
spaced around
diameter
Burner tube
IEC  003/2000
Lock-nut detail
Material: brass or any other suitable material
Tolerances on linear dimensions:
xx (e.g. 20) means ± 0,5 mm
xx,x (e.g. 20,0) means ± 0,1 mm
unless otherwise stated.
Tolerances on angular dimensions:
x (e.g. 45 ) means ±30 min
unless otherwise stated.
Figure A.1 (continued overleaf)
1,5
6,5
22,2
2,5
100 ± 10
6,5
25 ± 2
– 18 – 60695-11-3 © IEC:2012
Burner tube
Valve seat
Lock-nut
Main body
Suitable packing material
Needle valve packing nut
Needle valve
Adjustable stop
for valve
Material: brass or any other suitable material
IEC  004/2000
Figure A.1 – General assembly and details

60695-11-3 © IEC:2012 – 19 –
Gas flowmeter
Burner
Control valve
Manometer
Adjustable
Fuel gas source
air inlet
Needle valve adjustment IEC  426/04

NOTE 1 A manometer is required in conjunction with a mass flowmeter in order to maintain the required back
pressure.
NOTE 2 The inner diameter of the tubes connecting the flowmeters to the burner must be of adequate size to
minimize pressure drop.
Figure A.2 – Supply arrangement for burner (example)

– 20 – 60695-11-3 © IEC:2012
Dimensions in millimetres
Suspension point
Temperature measurement
apparatus
After ensuring that the thermocouple is inserted
the full depth of the hole, the copper is compressed
around the thermocouple to retain it without damage
IEC  427/04
The mode of suspension of the copper block shall be such that the copper block remains essentially stationary
during the test.
Figure A.3 – Confirmatory test arrangement
55 ± 1 75 min.
60695-11-3 © IEC:2012 – 21 –
Annex B
(normative)
Test arrangement – Method C
Air
supply
Gas
supply
IEC  014/2000
Key
1 burner barrel Parts 1, 2, 3 and 4 are hard-sold
...