EN 61558-2-3:2000

SLOVENSKI STANDARD
01-september-2000
Safety of power transformers, power supply units and similar devices - Part 2-3:
Particular requirements for ignition transformers for gas and oil burners (IEC
61558-2-3:1999)
Safety of power transformers, power supply units and similar devices -- Part 2-3:
Particular requirements for ignition transformers for gas and oil burners
Sicherheit von Transformatoren, Netzgeräten und dergleichen -- Teil 2-3: Besondere
Anforderungen an Zündtransformatoren für Gas- und Ölbrenner
Sécurité des transformateurs, blocs d'alimentation et dispositifs analogues -- Partie 2-3:
Règles particulières pour les transformateurs d'allumage pour brûleurs à gaz et
combustibles liquides
Ta slovenski standard je istoveten z: EN 61558-2-3:2000
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME CEI
INTERNATIONALE IEC
61558-2-3
INTERNATIONAL
Première édition
STANDARD
First edition
1999-10
PUBLICATION GROUPÉE DE SÉCURITÉ
GROUP SAFETY PUBLICATION
Sécurité des transformateurs, blocs d'alimentation
et dispositifs analogues –
Partie 2-3:
Règles particulières pour les transformateurs
d'allumage pour brûleurs à gaz et combustibles
liquides
Safety of power transformers, power supply units
and similar devices –
Part 2-3:
Particular requirements for ignition transformers
for gas and oil burners
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61558-2-3 © IEC:1999 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITS
AND SIMILAR DEVICES –
Part 2-3: Particular requirements for ignition transformers
for gas and oil burners
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The 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: Small
power transformers, reactors and power supply units: Safety requirements.
It has the status of a group safety publication in accordance with IEC Guide 104: The
preparation of safety publications and the use of basic safety publications and group safety
publications (1997).
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.
The text of this standard is based upon the following documents:
FDIS Report on voting
96/132/FDIS 96/138/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 3.

61558-2-3 © IEC:1999 – 5 –
This part 2-3 is intended to be used in conjunction with IEC 61558-1. It was established on the
basis of the first edition (1997) of that standard.
This part 2-3 supplements or modifies the corresponding clauses in IEC 61558-1, so as to
convert that publication into the IEC standard: Particular requirements for ignition transformers
for gas and oil burners.
This standard replaces the section 2 of chapter II of IEC 60989.
When a particular subclause of part 1 is not mentioned in this part 2-3, that subclause applies
as far as is reasonable. Where this standard states "addition", "modification" or "replacement",
the relevant text of part 1 is to be adapted accordingly.
In this standard, the following print types are used:
– requirements proper: in roman type;
– test specifications: in italic type;
– explanatory matter: in smaller roman type.
In the text of the standard the words in bold are defined in clause 3.
Subclauses or figures which are additional to those in part 1 are numbered starting from 101;
supplementary annexes are entitled AA, BB, etc.
The committee has decided that this publication remains valid until 2003-12. At this date, in
accordance with the committee's decision, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
61558-2-3 © IEC:1999 – 7 –
SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITS
AND SIMILAR DEVICES –
Part 2-3: Particular requirements for ignition transformers
for gas and oil burners
1 Scope
Replacement:
This International Standard deals with all aspects of safety such as electrical, thermal and
mechanical aspects.
This part of IEC 61558 applies to fixed single-phase air-cooled (natural or forced) associated
transformers (incorporated or not) used in the ignition system of gas and oil burners, having a
rated supply voltage not exceeding 1 000 V a.c. and a rated frequency not exceeding
500 Hz. The rated output current does not exceed 500 mA a.c.
NOTE 1 Due to the national safety law, in Japan the does not exceed 50 mA.
rated output current
The no-load output voltage and the rated no-load output voltage does not exceed 15 000 V a.c.
This standard applies to transformers where double or reinforced insulation between circuits
is not required by the installation rules or by the appliance specification.
NOTE 2 The transformers are intended to be associated with equipment to provide voltages different from the
supply voltage for the functional requirement of the equipment. The safety insulation may be provided (or
completed) by other features of the equipment, such as the body.
This standard is applicable to dry-type transformers. The windings may be encapsulated or
non encapsulated.
NOTE 3 For transformers filled with liquid dielectric or pulverised material, such as sand, additional requirements
are under consideration.
NOTE 4 Attention is drawn to the fact that
– for transformers intended to be used in tropical countries special requirements may be necessary;
– in locations where special environmental conditions prevail, particular requirements may be necessary.
This standard also applies to transformers incorporating electronic circuits. This standard does
not apply to external circuits and their components intended to be connected to the input and
output terminals or socket-outlets of the transformer.
NOTE 5 Electronic ignition transformers are under consideration.
2 Normative references
This clause of part 1 is applicable except as follows:
Addition:
ISO 3864: 1984, Safety colours and safety signs

61558-2-3 © IEC:1999 – 9 –
3 Definitions
This clause of part 1 is applicable except as follows:
Addition:
3.1.101
ignition transformer
fixed single-phase air-cooled associated transformer which is part of the equipment which,
from a high potential, generates an arc between two electrodes which are connected to the
high voltage output of the transformer. This transformer needs to be used with a control unit
being part of the ignition equipment.
3.1.102
rated duty factor
time interval during which the transformer operates, expressed as a percentage of the duration
of the whole cycle
3.1.103
functional insulation
insulation between conductive parts, which is necessary only for the proper functioning of the
equipment
3.5.4 Replacement:
rated output current
output current at rated supply voltage and rated frequency when the output winding is
short-circuited, assigned to the transformer by the manufacturer
3.5.5 Replacement:
rated output voltage
output voltage when the transformer is connected to rated supply voltage at rated frequency
under no-load conditions
4 General requirements
This clause of part 1 is applicable.
5 General notes on tests
This clause of part 1 is applicable.
6 Rating
This clause of part 1 is applicable except as follows:
Addition:
6.101 The rated output voltage shall not exceed 15 000 V a.c.
6.102 Void
6.103 The rated frequency shall not exceed 500 Hz.

61558-2-3 © IEC:1999 – 11 –
6.104 The rated supply voltage shall not exceed 1 000 V a.c.
6.105 Ignition transformers are intended for intermittent operation or for continuous
operation.
NOTE Preferred value for the whole cycle of intermittent operation is 3 min.
6.106 The rated output current shall not exceed 500 mA a.c.
NOTE Due to the national safety law, in Japan the rated output current shall not exceed 50 mA.
6.107 Preferred values of rated output voltage, rated output current and rated duty factor
are given in table 101.
Compliance with the requirements of 6.101 to 6.107 is checked by the 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.
NOTE Incorporated transformers are not classified; their degree of protection against electric shock is
determined by the way in which the transformer is incorporated.
7.2 Replacement:
According to short-circuit protection or protection against abnormal use:
– inherently short-circuit proof transformers;
– fail-safe transformers.
7.4 Replacement:
According to their mobility:
– fixed transformers.
7.5 Replacement:
According to their time of operation:
– continuous operation;
– intermittent operation.
7.6 Replacement:
7.6.2 is not applicable.
61558-2-3 © IEC:1999 – 13 –
8 Marking and other information
This clause of part 1 is applicable except as follows:
8.1 Item c) does not apply.
8.1 Item d) Replacement:
rated output current in milliamperes.
8.1 Item f) does not apply.
Item h) Addition:
8.1
Ignition transformers shall be marked with one of the graphical symbols shown in 8.11:
8.1 Item p) Replacement:
Ignition transformers for intermittent operation shall be marked with the rated duty factor
and the duration of the whole cycle.
Addition:
8.1 Item q) Transformers shall be marked with the graphical symbol 5036 of IEC 60417 with
the colour in accordance with ISO 3864.
As ignition transformers are associated transformers, this 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 put on the equipment close to the transformer.
8.11 Addition:
Symbol Explanation Number of symbol in
IEC 60417
Inherently short-circuit proof ignition transformer
with one end of the output winding connected to the
earth
Inherently short-circuit proof ignition transformer
with the midpoint of the output winding connected to
the earth
Fail-safe ignition transformer with one end of the
F
output winding connected to the earth
Fail-safe ignition transformer with the midpoint of
F the output winding connected to the earth

61558-2-3 © IEC:1999 – 15 –
8.14 Addition:
Ultimate safety of ignition transformers for gas and oil burners is dependent upon the control
unit and this shall be stated in the instruction sheets.
9 Protection against accessibility to hazardous live parts
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 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 rated frequency and operated at
the rated duty factor until steady-state conditions are reached. The output current is then
measured.
The supply voltage is then reduced to 85 %. The minimum output current value shall not be
less than 70 % of the rated output current.
11.2 The no-load output voltage shall not differ from the rated output voltage by more
than 10 %.
NOTE Due to the National safety
...