IEC 61558-2-3:2010

IEC 61558-2-3 ®
Edition 2.0 2010-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUB LICATION GROUPÉE DE SÉCURITÉ
Safety of transformers, reactors, power supply units and combinations thereof –
Part 2-3: Particular requirements and tests for ignition transformers for gas and
oil burners
Sécurité des transformateurs, bobines d’inductance, blocs d’alimentation et des
combinaisons de ces éléments –
Partie 2-3: Règles particulières et essais pour les transformateurs d’allumage
pour brûleurs à gaz et combustibles liquides

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IEC 61558-2-3 ®
Edition 2.0 2010-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUB LICATION GROUPÉE DE SÉCURITÉ
Safety of transformers, reactors, power supply units and combinations thereof –
Part 2-3: Particular requirements and tests for ignition transformers for gas and
oil burners
Sécurité des transformateurs, bobines d’inductance, blocs d’alimentation et des
combinaisons de ces éléments –
Partie 2-3: Règles particulières et essais pour les transformateurs d’allumage
pour brûleurs à gaz et combustibles liquides

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
Q
CODE PRIX
ICS 29.180 ISBN 978-2-88912-034-5
– 2 – 61558-2-3 © IEC:2010
CONTENTS
FOREWORD.3
1 Scope.6
2 Normative references .7
3 Terms and definitions .7
4 General requirements .7
5 General notes on tests .7
6 Ratings.8
7 Classification.8
8 Marking and other information .9
9 Protection against electric shock .10
10 Change of input voltage setting .10
11 Output voltage and output current under load .10
12 No-load output voltage .11
13 Short-circuit voltage .11
14 Heating .11
15 Short-circuit and overload protection .11
16 Mechanical strength .12
17 Protection against harmful ingress of dust, solid objects and moisture.12
18 Insulation resistance, dielectric strength and leakage current .13
19 Construction .13
20 Components .14
21 Internal wiring.14
22 Supply connection and other external flexible cable or cords .14
23 Terminals for external conductors.14
24 Provisions for protective earthing .14
25 Screws and connections .14
26 Creepage distances, clearances and distances through insulation.14
27 Resistance to heat, fire and tracking.15
28 Resistance to rusting.15
Annexes .17
Annex C Creepage distances (cr), clearances (cl) and distances through insulation
(dti) – Material group II (400 ≤CTI <600) .17
Annex D Creepage distances (cr), clearances (cl) and distances through insulation
(dti) – Material group I (CTI ≥600).17

Figure 101 – Arcing horn .16

Table 101 – Preferred values of operational parameters .11
Table 102 – Test time for short-circuit test .12
Table 103 – Creepage distances and clearances for output terminals .15

61558-2-3 © IEC:2010 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF TRANSFORMERS, REACTORS,
POWER SUPPLY UNITS AND COMBINATIONS THEREOF –

Part 2-3: Particular requirements and tests for ignition
transformers for gas and oil burners

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,
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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
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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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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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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
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services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
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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 61558-2-3 has been prepared by IEC technical committee 96:
Transformers, reactors, power supply units and combinations thereof.
This second edition cancels and replaces the first edition published in 1999. It constitutes a
technical revision. The main changes consist of updating this part in accordance with
IEC 61558-1:2005.
This part has the status of a group safety publication in accordance with IEC Guide 104:
1997, The preparation of safety publications and the use of basic safety publications and
group safety publications.
– 4 – 61558-2-3 © IEC:2010
The text of this standard is based on the following documents:
FDIS Report on voting
96/357/FDIS 96/364/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.
This part is intended to be used in conjunction with the latest edition of IEC 61558-1 and its
amendments. It is based on the second edition (2005) of that standard.
This part supplements or modifies the corresponding clauses in IEC 61558-1, so as to convert
that publication into the IEC standard: Particular requirements and tests for ignition for gas
and oil burners.
A list of all parts of the IEC 61558 series, under the general title: Safety of transformers,
reactors, power supply units and combinations thereof, can be found on the IEC website.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
Where a particular subclause of Part 1 is not mentioned in this part, that subclause applies as
far as is reasonable. Where this part states "addition", "modification" or "replacement", the
relevant text of Part 1 is to be adopted accordingly.
In this part, the following print types are used:
– requirements proper: in roman type;
– test specifications: in italic type;
explanatory matters: in smaller roman type.
–
In the text of this part, the words in bold are defined in Clause 3.
Subclauses, notes, figures and tables additional to those in Part 1 are numbered starting from
101; supplementary annexes are entitled AA, BB, etc.
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.
61558-2-3 © IEC:2010 – 5 –
NOTE The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations may need a transitional period following publication of a new, amended or revised IEC publication in
which to make products in accordance with the new requirements and to equip themselves for conducting new or
revised tests.
It is the recommendation of the committee that the content of this publication be adopted for implementation
nationally not earlier than 12 months from the date of publication.

– 6 – 61558-2-3 © IEC:2010
SAFETY OF TRANSFORMERS, REACTORS,
POWER SUPPLY UNITS AND COMBINATIONS THEREOF –

Part 2-3: Particular requirements and tests for ignition
transformers for gas and oil burners

1 Scope
Replacement:
This part of IEC 61558 deals with the safety of ignition transformers for gas and oil burners.
Ignition transformers incorporating electronic circuits are also covered by this standard.
NOTE 1 Safety includes electrical, thermal, mechanical and chemical aspects.
Unless otherwise specified, from here onward, the term transformer covers ignition
transformers for gas and oil burners.
This part applies to fixed single-phase air-cooled (natural or forced) associated dry-type
transformers used in the ignition systems of gas and oil burners. The windings may be
encapsulated or non-encapsulated.
The rated supply voltage does not exceed 1 000 V a.c., and the rated supply frequency
and the internal operational frequency do not exceed 500 Hz.
The rated short-circuit output current does not exceed 500 mA a.c.
The no-load output voltage or the rated output voltage does not exceed 15 000 V a.c.
This part is not applicable to external circuits and their components intended to be connected
to the input and output terminals or socket-outlets of the transformers.
Transformers covered by this part are used in applications where double or reinforced
insulation between circuits is not required by the installation rules or by the end product
standard.
NOTE 2 Attention is drawn to the following:
- for transformers intended to be used in vehicles, on board ships, and aircraft, additional requirements (from
other applicable standards, national rules, etc.) may be necessary;
- measures to protect the enclosure and the components inside the enclosure against external influences such
as fungus, vermin, termites, solar-radiation, and icing should also be considered;
- the different conditions for transportation, storage, and operation of the transformers should also be
considered;
- additional requirements in accordance with other appropriate standards and national rules may be applicable to
transformers intended for use in special environments.
NOTE 3 Future technological development of transformers may necessitate a need to increase the upper limit of
the frequencies, until then this part may be used as a guidance document.

61558-2-3 © IEC:2010 – 7 –
2 Normative references
This clause of Part 1 is applicable, except as follows:
Addition:
IEC 61558-1 :2005, Safety of power transformers, power supplies, reactors and similar
products – Part 1: General requirements and tests
ISO 3864-1:2002, Graphical symbols – Safety colours and safety signs – Part 1: Design
principles for safety sign in workplaces and public areas – Part 1:Design principles for safety
signs in workplaces and public areas
3 Terms and definitions
This clause of Part 1 is applicable, except as follows:
Addition:
3.1.101
ignition transformer
fixed single-phase air-cooled associated transformer within an ignition system generating
an arc between two electrodes connected to the high voltage output of the transformer. This
transformer is intended to be used with a control unit built-in in the ignition system
3.1.102
rated duty factor
time interval during which the transformer operates, expressed as a percentage of the
duration of the entire cycle
3.5.101
rated short-circuit output current
output current at the rated supply voltage and the rated frequency when the output
winding is short-circuited, assigned to the transformer by the manufacturer
3.5.102
rated no-load output voltage
output voltage when the transformer is connected to the rated supply voltage at the rated
supply frequency under no-load conditions, assigned to the transformer by the
manufacturer
Replacement:
3.5.4 not applicable.
3.5.5 not applicable.
4 General requirements
This clause of Part 1 is applicable.
5 General notes on tests
This clause of Part 1 is applicable.

– 8 – 61558-2-3 © IEC:2010
6 Ratings
This clause of Part 1 is applicable, except as follows:
Addition:
6.101 The rated no-load output voltage shall not exceed 15 000 V a.c.
6.102 Void.
6.103 The rated frequency shall not exceed 500 Hz.
6.104 The rated supply voltage shall not exceed 1 000 V a.c.
6.105 The rated short-circuit output current shall not exceed 500 mA a.c.
6.106 Preferred values of the rated no-load output voltage, the rated short-circuit output
current, and the rated duty factor are given in Table 101.
Compliance with the requirements of 6.101 to 6.106 is checked by inspection of the marking.
7 Classification
This clause of Part 1 is applicable, except as follows:
7.1 Replacement:
According to their protection against electric shock:
– class I transformers, for specific use only.
NOTE Incorporated transformers are not classified. Their class of protection against electric shock is
determined by the way the transformer is incorporated.
7.2 Replacement:
According to short-circuit protection or protection against abnormal conditions:
– inherently short-circuit proof transformers;
– fail-safe transformers.
7.4 Replacement:
According to their mobility:
– fixed ignition transformers for gas and oil burners.
7.5 Replacement:
According to their duty type:
– continuous duty;
– intermittent duty cycle.
7.6
61558-2-3 © IEC:2010 – 9 –
This clause of Part 1 is applicable, except as follows
7.6.2 not applicable.
8 Marking and other information
This clause of Part 1 is applicable, except as follows:
8.1 Items b), c), d), and f) are not applicable.
8.1 h) Replacement:
Transformers shall be marked with one of the graphical symbols shown in 8.11;
8.1 q) Replacement:
Transformers for intermittent duty cycle shall be marked with the rated duty factor
expressed as a percentage and the duration of the entire cycle expressed in minutes.
NOTE Preferred value for the entire cycle of intermittent duty is 3 min.
Addition:
8.1.101 Transformers shall be marked with the graphical symbol according to 8.11 with the
colour in accordance with ISO 3864-1.
For incorporated transformers, the above graphical symbol may be either on the
transformer or on the equipment placed close to the transformer. If the graphical symbol is
not on the transformer, the manufacturer shall state in the instruction sheets that this
graphical symbol shall be placed on the equipment close to the transformer.
8.1.102 Transformers shall be marked with the rated short-circuit output current in
milliamperes and with the rated no load output voltage in kV.
8.11 Addition:
Symbol or Explanation or title Identification
graphical symbol
Inherently short-circuit proof ignition transformer
with one end of the output winding for connection to
the protective earth
Inherently short-circuit proof ignition transformer
with the midpoint of the output winding for
connection to the protective earth

Fail-safe ignition transformer with one end of the
output winding for connection to the protective earth

Fail-safe ignition transformer with the midpoint of
the output winding for connection to the protective
earth
– 10 – 61558-2-3 © IEC:2010
8.14 Addition:
Ultimate safety of transformers is dependent upon the control unit and this shall be stated in
the instruction sheet.
9 Protection against electric shock
This clause of Part 1 is applicable.
10 Change of input voltage setting
This clause of Part 1 is applicable.
11 Output voltage and output current under load
Replacement:
11 Output voltage and output current
11.1 The output current shall not differ from the rated short-circuit output current by more
than 10 %.
Compliance is checked by the following test:
The output terminals of the transformer are short-circuited by means of a suitable ammeter.
The transformer is connected to the rated supply voltage at the rated frequency and
operated at the rated duty factor until steady-state conditions are reached. The output
current is then measured.
With the supply voltage reduced to 85 %, the minimum output current value shall not be less
than 70 % of the rated short-circuit output current.
11.2 The no-load output voltage shall not differ from the rated no-load output voltage by
more than 10 %.
Compliance is checked by the following test:
The transformer is connected to the rated supply voltage at the rated frequency. The
r.m.s. value of the no-load output voltage is measured. During this test, the protective
earthing terminal shall be connected to the protective earth.
NOTE The test equipment should be selected such that no voltage rise occurs due to the capacitance (i.e.,
increase in the capacitance) in the test equipment or measurement network.

61558-2-3 © IEC:2010 – 11 –
Table 101 – Preferred values of operational parameters
Type of connection of the M M E E M M M E E M M M
output winding to the
protective earth
Rated duty factor 100 100 100 100 33 33 33 33 33 20 20 20
%
Rated no-load output 14 10 7 5 14 10 10 7 5 10 10 10
voltage
kV
Rated short-circuit output 20 20 20 20 30 20 16 20 20 23 20 16
current
mA
M = midpoint of the output winding for connection to protective earth
E = one end of the output winding for connection to protective earth

12 No-load output voltage
This clause of Part 1 is not applicable.
13 Short-circuit voltage
This clause of Part 1 is not applicable.
14 Heating
This clause of Part 1 is applicable, except as follows:
14.1 Addition after the second paragraph:
For intermittent duty cycle, the test is carried out at the rated duty factor. Temperatures
are measured in the middle of the interval during which the transformer operates.
Replacement of the tenth paragraph starting with "Transformers are supplied at.", by the
following:
Transformers are connected to 1,06 times the rated supply voltage, at the rated
frequency, and the output winding of the transformer or output terminals are short-
circuited.
15 Short-circuit and overload protection
This clause of Part 1 is applicable except as follows:
15.1 Replacement of the second paragraph:
Compliance is checked by inspection and by the following test, which is performed with the
transformer at ambient temperature, with the same position of the transformer as in the test
of 14.1. The test is carried out at 1,06 times the rated supply voltage, or, for non inherently
short-circuit proof transformers, at any value of the supply voltage between 0,9 times and
1,1 times the rated supply voltage:

– 12 – 61558-2-3 © IEC:2010
NOTE The overload is only applied to the transformer during the first adjustment of the burner when the
transformer is at ambient temperature.
Addition:
– additionally by the tests of 15.1.101.
15.1.101 Transformer is connected to an arcing horn as shown in Figure 101 and supplied
at 1,06 times the rated supply voltage at the rated frequency, taking into consideration the
rated duty factor. During the test the arcing horn shall be in a vertical position and in a
draught-free location.
The arcing horn shall be so designed that the rising spark reaches repetitive extinction.
Distance A and angle α shall be adjusted accordingly. The test is carried out for a period of
50 days.
NOTE For transformers having a rated no-load output voltage less than 10 kV, the angle of horn may be
adjusted for the test in order to reach extinction of the spark.
The length of the high voltage leads shall be less than 300 mm. The leads shall not have
metal sheaths and shall have a copper cross-sectional area of at least 1 mm². The average
distance between these leads should be approximately 40 mm.
During the test, the insulation of the transformer shall not fail.
After this test, the transformer shall withstand the tests according to Clauses 11 and 18,
except the values of Clause 18 shall be reduced by 35 %.
15.2 Replacement:
For inherently short-circuit proof transformers for continuous operation, this test is
covered by the test of 14.1.
For inherently short-circuit proof transformers for intermittent duty cycle, the tests are
performed with the output terminals of the output winding short-circuited. The test time for
transformers for gas burners is twice the time interval during which the transformer
operates (to be calculated from the rated duty factor and the duration of the cycle). The test
time for oil burners is stated in Table 102.
Table 102 – Test time for short-circuit test
Rated duty factor Test time
% min
Less than 20 8
20 up to 30 15
30 up to and less than 100 30
16 Mechanical strength
This clause of Part 1 is applicable.
17 Protection against harmful ingress of dust, solid objects and moisture
This clause of Part 1 is applicable, except as follows:

61558-2-3 © IEC:2010 – 13 –
Addition:
17.101 Transformers for specific use shall have an IP X4 code of protection or higher.
18 Insulation resistance, dielectric strength and leakage current
This clause of Part 1 is applicable, except as follows:
18.2 Table 7: values for double or reinforced insulation are not applicable.
18.3 Table 8a:
– lines 2 and 4 are not applicable;
– lines 1 and 3 are applicable only for the input circuits of transformers with the core
connected to protective earth.
18.4 Replacement of the first paragraph by the following:
After the test of 18.3, transformers are tested for 1 min at twice the rated frequency and
with the input voltage increased until the output voltage corresponds to 1,5 times the rated
value. No load is connected.
19 Construction
This clause of Part 1 is applicable, except as follows:
19.1 Replacement:
The input and output circuits shall be electrically separated from each other, and the
construction shall be such that there is no possibility of any connection between these
circuits, either directly or indirectly, via other conductive parts, except by deliberate action.
Compliance is checked by inspection and measurements, taking Clauses 18 and 26 into
consideration.
19.1.1 The insulation between input and output winding(s) shall consist of at least basic
insulation.
In addition, the following apply:
The insulation between the input windings and the body, and between the input windings
and the core, shall consist of basic insulation according to the rated supply voltage. The
insulation between the output circuit(s) and the body and between the output circuit(s) and
the core shall be functional insulation. These insulations shall be checked by the tests of
15.1.101 and 18.4.
19.1.2 For transformers with intermediate conductive parts not connected to the body or
core, and located between the input and output windings, the insulation between the
intermediate conductive parts and the input windings or between the intermediate
conductive parts and the output windings shall consist of at least basic insulation. The
basic insulation shall be in accordance with the rated supply voltage.
NOTE An intermediate conductive part not separated from the input or output windings or the body by at
least basic insulation, is considered to be connected to the relevant part(s).
19.15 Not applicable.
– 14 – 61558-2-3 © IEC:2010
19.19 Modification:
Transformers designed for connection by means of a flexible cable or cord, shall be provided
with a non-detachable flexible cable or cord with a protective earth conductor.
Addition:
19.101 The output circuit(s) shall be connected to protective earth.
However, the output circuit(s) need not to be connected to protective earth if the output
circuit is connected to a measuring device, e.g. an ionisation flame monitor. In this case
either the output circuit needs to be earthed as long as the input circuit is energized, or the
voltage supplied to the measuring device shall be limited to less than 400 V rms.
NOTE 1 The voltage supplied to the measuring device can e.g. be done by an external voltage limiter and a
series resistor.
NOTE 2 The above requirement serves to avoid voltages higher than 400 V rms on the subsequent signal wire
between the transformer and the ionisation flame monitor.
19.102 The core, if accessible, shall be connected to protective earth.
Compliance is checked by inspection.
20 Components
This clause of Part 1 is applicable.
21 Internal wiring
This clause of Part 1 is applicable.
22 Supply connection and other external flexible cable or cords
This clause of Part 1 is applicable.
23 Terminals for external conductors
This clause of Part 1 is applicable.
24 Provisions for protective earthing
This clause of Part 1 is applicable.
25 Screws and connections
This clause of Part 1 is applicable.
26 Creepage distances, clearances and distances through insulation
This clause of Part 1 is applicable, except as follows:

61558-2-3 © IEC:2010 – 15 –
Modification:
This clause applies only to input circuit(s) as the output circuit(s) is (are) connected to
protective earth. In this case, the functional insulation between the core and the output
circuit(s) is considered to be sufficiently checked by the test of 15.1.101 and 18.4.
Table 13 is applicable as follows:
Line 1) is applicable, except the working voltage shall be replaced with the rated supply
voltage.
Line 3) is applicable only to the input circuits.
Line 4) is applicable only to the input terminals. For terminals of the output circuits, the
values of Table 103 apply.
Line 5) is applicable with the working voltage replaced with the rated supply voltage.
Table 103 – Creepage distances and clearances for output terminals
Connections to earth Type of insulation Creepage distance Clearance
mm mm
5,1 mm × U 3,4 mm × U
One end of the output Creepage distance and
kV  kV
winding (s) for connection clearance between output
to protective earth terminals and protective
earth
5,1 mm × U 3,4 mm × U
Creepage distance and
kV  kV
clearance between output
Midpoint of the output
terminals
winding (s) for connection
2,55 mm × U 1,7 mm × U
to protective earth
Creepage distance and
kV  kV
clearance between output
terminals and protective
earth
NOTE U is the rated no-load output voltage in kV.
27 Resistance to heat, fire and tracking
This clause of Part 1 is applicable, except as follows:
27.2 Not applicable.
28 Resistance to rusting
This clause of Part 1 is applicable.

– 16 – 61558-2-3 © IEC:2010
Dimensions in millimetres
α ≈ 20°
R10
∅2
R7
A
R5
IEC  1619/10
Rated output Approximate gap A
voltage
kV mm
Up to and including 6 2
More than 6
up to and including 10 3
More than 10
up to and including 15 5
Figure 101 – Arcing horn
61558-2-3 © IEC:2010 – 17 –
Annexes
The annexes of Part 1 are applicable, except as follows:

Annex C
Creepage distances (cr), clearances (cl)
and distances through insulation (dti) –
Material group II (400 ≤CTI <600)

The Annex C of Part 1 is applicable, except as follows:
Table C.1 is applicable, except as follows:
Line 1) is applicable, except the working voltage shall be replaced by the rated supply
voltage.
Line 3) is applicable only to the input circuits.
Line 4) is applicable only to the input terminals. For terminals of the output circuits, the
values of Table 103 apply.
Line 5) is applicable, except the working voltage shall be replaced with the rated supply
voltage.
Annex D
Creepage distances (cr), clearances (cl)
and distances through insulation (dti) –
Material group I (CTI ≥600)
The Annex D of Part 1 is applicable, except as follows:
Table D.1 is applicable, except as follows:
Line 1) is applicable, except the working voltage shall be replaced with the rated supply
voltage.
Line 3) is applicable only to the input circuits.
Line 4) is applicable only to the input terminals. For terminals of the output circuits, the
values of Table 103 apply.
Line 5) is applicable, except the working voltage shall be replaced with the rated supply
voltage.
___________
– 18 – 61558-2-3 © CEI:2010
SOMMAIRE
AVANT-PROPOS.19
1 Domaine d’application .22
2 Références normatives.23
3 Termes et définitions .23
4 Exigences générales .23
5 Généralités sur les essais .24
6 Caractéristiques assignées.24
7 Classification.24
8 Marquage et autres indications.25
9 Protection contre les chocs électriques.26
10 Changement de la tension primaire d’alimentation.26
11 Tension secondaire et courant secondaire en charge .26
12 Tension secondaire à vide.27
13 Tension de court-circuit .27
14 Echauffements .27
15 Protection contre les courts-circuits et les surcharges .28
16 Résistance mécanique .29
17 Protection contre les effets nuisibles dus à la pénétration de poussière, d’objets
solides et de l’humidité .29
18 Résistance d'isolement, rigidité diélectrique et courant de fuite .29
19 Construction .29
20 Composants .30
21 Conducteurs internes .30
22 Raccordement à l’alimentation et câbles souples externes .31
23 Bornes pour conducteurs externes .31
24 Dispositions en vue de la mise à la terre .31
25 Vis et connexions .31
26 Lignes de fuite, distances d’isolement et distances à travers l’isolation .31
27 Résistance à la chaleur, au feu et aux courants de cheminement .32
28 Protection contre la rouille.32
Annexes .34
Annexe C Lignes de fuite (Idf), distances d'isolement (d) et distances à travers
l'isolation (dti) – Matériau groupe II (400 ≤CTI <600).34
Annexe D Lignes de fuite (Idf), distances d'isolement (d) et distances à travers
l'isolation (dti) – Matériau groupe I (CTI ≥600) .34

Figure 101 – Eclateur à cornes .33

Tableau 101 – Valeurs préférentielles des paramètres opérationnels.27
Tableau 102 – Temps d’essai pour les essais en court-circuit.29
Tableau 103 – Lignes de fuite et distances dans l'air pour les bornes secondaires .32

61558-2-3 © CEI:2010 – 19 –
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
SÉCURITÉ DES TRANSFORMATEURS, BOBINES D’INDUCTANCE, BLOCS
D’ALIMENTATION ET DES COMBINAISONS DE CES ÉLÉMENTS –

Partie 2-3: Règles particulières et essais pour les transformateurs
d’allumage pour brûleurs à gaz et combustibles liquides

AVANT-PROPOS
1) La Commission Electrotechnique Internationale (CEI) est une organisation mondiale de normalisation
composée de l'ensemble des comités électrotechniques nationaux (Comités nationaux de la CEI). La CEI a
pour objet de favoriser la coopération internationale pour toutes les questions de normalisation dans les
domaines de l'électricité et de l'électronique. A cet effet, la CEI – entre autres activités – publie des Normes
internationales, des Spécifications techniques, des Rapports techniques, des Spécifications accessibles au
public (PAS) et des Guides (ci-après dénommés "Publication(s) de la CEI"). Leur élaboration est confiée à des
comités d'études, aux travaux desquels tout Comité national intéressé par le sujet traité peut participer. Les
organisations internationales, gouvernementales et non gouvernementales, en liaison avec la CEI, participent
également aux travaux. La CEI collabore étroitement avec l'Organisation Internationale de Normalisation (ISO),
selon des conditions fixées par accord entre les deux organisations.
2) Les décisions ou accords officiels de la CEI concernant les questions techniques représentent, dans la mesure
du possible, un accord international sur les sujets étudiés, étant donné que les Comités nationaux de la CEI
intéressés sont représentés dans chaque comité d’études.
...