IEC 61347-2-2:2024

IEC 61347-2-2 ®
Edition 3.0 2024-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Controlgear for electric light sources – Safety –
Part 2-2: Particular requirements – Electronic step-down convertors for filament
lamps
Appareillages de commande pour les sources de lumière électriques – Sécurité –
Partie 2-2: Exigences particulières – Convertisseurs abaisseurs électroniques
pour lampes à incandescence
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IEC 61347-2-2 ®
Edition 3.0 2024-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Controlgear for electric light sources – Safety –

Part 2-2: Particular requirements – Electronic step-down convertors for filament

lamps
Appareillages de commande pour les sources de lumière électriques – Sécurité –

Partie 2-2: Exigences particulières – Convertisseurs abaisseurs électroniques

pour lampes à incandescence
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.140.99  ISBN 978-2-8322-9094-1

– 2 – IEC 61347-2-2:2024 © IEC 2024
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General requirements . 7
5 General notes on tests . 7
6 Information and marking . 7
6.1 Information and marking items . 7
6.1.1 Mandatory marking . 7
6.1.2 Information to be provided . 7
6.2 Durability and legibility of marking . 7
6.3 Built-in controlgear without an enclosure and integral controlgear . 7
7 Terminals . 7
8 Earthing . 8
9 Protection against accidental contact with hazardous live parts . 8
10 Insulation resistance and electric strength . 8
11 Fault conditions . 8
12 Construction . 8
13 Creepage distances, clearances and distances through insulation . 8
14 Screws, current-carrying parts and connections . 8
15 Resistance to heat, fire and tracking . 8
16 Thermal requirements . 9
16.1 General . 9
16.2 Normal operation . 9
16.3 Abnormal operation . 9
Annex A (informative) Schedule of more onerous requirements . 10
Bibliography . 11

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONTROLGEAR FOR ELECTRIC LIGHT SOURCES – SAFETY –

Part 2-2: Particular requirements – Electronic
step-down convertors for filament lamps

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
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
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shall not be held responsible for identifying any or all such patent rights.
IEC 61347-2-2 has been prepared by subcommittee 34C: Auxiliaries for lamps, of IEC technical
committee 34: Lighting. It is an International Standard.
This third edition cancels and replaces the second edition published in 2011. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) alignment with respect to the fourth edition of IEC 61347-1;
– introduction of dated references to the fourth edition of IEC 61347-1 as appropriate;
– deletion of the clauses and subclauses which are either no longer relevant or now
covered in IEC 61347-1;
– 4 – IEC 61347-2-2:2024 © IEC 2024
b) scope extension to 1 500 V for direct current;
c) scope clarification;
d) deletion of unused definitions;
e) revision of information and marking requirements;
f) revision of compliance conditions for the measurement of the output voltage during fault
condition testing and during thermal testing.
The text of this International Standard is based on the following documents:
Draft Report on voting
34C/1597/FDIS 34C/1602/RVD
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 International Standard is English.
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/publications.
This document is intended to be used in conjunction with IEC 61347-1:2024. Where the
requirements of any of the clauses of IEC 61347-1:2024 are referred to in this document by the
phrase "IEC 61347-1:2024, Clause n applies", this phrase is interpreted as meaning that all the
requirements of the clause in question of IEC 61347-1:2024 apply, except any which are clearly
inapplicable to the specific type of controlgear covered by this document.
A list of all parts in the IEC 61347, published under the general title Controlgear for electric light
sources – Safety, can be found on the IEC website.
Future documents in this series will carry the new general title as cited above. Titles of existing
documents in this series will be updated at the time of the next edition.
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 document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
INTRODUCTION
This document specifies safety requirements for filament lamp controlgear. All general
requirements, which apply to controlgear for electric light sources in general, regardless of the
specific type of light source in question, are contained in IEC 61347-1. The corresponding
general requirements apply to filament lamp controlgear by clause-wise reference in this
document to any of the clauses of IEC 61347-1, thereby specifying the extent to which such a
clause is applicable and the order in which the tests are performed.
In the same way, further documents exist specifying individual safety requirements for different
types of controlgear related to different types of electric light sources which, together with this
document, constitute the IEC 61347-2 series.
Any such parts of the IEC 61347-2 series are the leading documents for the safety assessment
of the corresponding type of controlgear; it is not IEC 61347-1.
Also, all parts of the IEC 61347-2 series are self-contained and therefore typically do not include
references to each other.
– 6 – IEC 61347-2-2:2024 © IEC 2024
CONTROLGEAR FOR ELECTRIC LIGHT SOURCES – SAFETY –

Part 2-2: Particular requirements – Electronic
step-down convertors for filament lamps

1 Scope
This part of IEC 61347 specifies safety requirements for electronic step-down convertors for
use on DC supplies of up to 1 500 V or AC supplies of up to 1 000 V at 50 Hz or 60 Hz, and
with a rated output voltage ≤ 50 V (RMS) at a frequency deviating from the supply frequency,
or 120 V ripple free DC between conductors and between any conductor and earth, associated
with tungsten-halogen lamps as specified in IEC 60357, and other filament lamps.
NOTE 1 The limits of 50 V (alternating current) and 120 V (direct current) are in accordance with the extra-low-
voltage (ELV) band of IEC 61140:2016.
NOTE 2 Performance requirements are covered by IEC 61047.
NOTE 3 Such step-down convertors can also be used for electric sources producing optical radiation with the same
technology used for purposes different than illumination and producing radiation other than visible spectrum.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 61347-1:2024, Controlgear for electric light sources – Safety – Part 1: General
requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61347-1 and the

following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
electronic step-down convertor
convertor
unit inserted between the supply and one or more tungsten-halogen or other filament lamps
which serves to supply the lamp(s) with its (their) rated voltage, generally at high frequency
Note 1 to entry: The unit can consist of one or more separate components and can include means for dimming,
correcting the power factor and suppressing radio interference.
Note 2 to entry: Whenever the term "controlgear" is used in IEC 61347-1, this includes convertors, being a specific
type of controlgear.
4 General requirements
IEC 61347-1:2024, Clause 4 applies, together with the following:
NOTE Convertors incorporated in an enclosure provided with an integral plug as the means of connection of the
electrical supply, also known as plug-in convertors, are considered independent controlgear.
5 General notes on tests
IEC 61347-1:2024, Clause 5 applies, together with the following:
Tests are carried out at the most onerous length of the output wire or cable being the minimum
or the maximum length according to the declaration of the manufacturer. If no minimum or
maximum length is declared, cable lengths of 20 cm or 200 cm shall be chosen. It is possible
to use two twisted wires or a cable H03VV-F. The cross-section of the conductors shall be
chosen according to the rated power and the current density shall not exceed 5 A/mm in normal
use.
For information on requalification of products compliant with the previous editions of this
document, i. e. IEC 61347-2-2:2011, refer to Annex A.
6 Information and marking
6.1 Information and marking items
6.1.1 Mandatory marking
Convertors, other than convertors covered by 6.3, shall be marked with the following, as
applicable:
• items a1), a2), b1), c2), e1), e2), f1), f3), f4), g2), g3), j2), j4), k1), l1) and p) of
IEC 61347-1:2024, 6.2; symbols according to item o) of IEC 61347-1:2024, 6.2, shall be
used, as applicable.
6.1.2 Information to be provided
The following information, if applicable, shall be given either on the convertor, or be made
available in the manufacturer’s catalogue or similar:
• items b2), b3), c1), c3), c4), c5), c6), c7), e3), f2), g1), h), i), j1), j3), j5), k2), l2), m) and n3)
of IEC 61347-1:2024, 6.2;
• a declaration of the allowed length of the output wire or cable, if it is not between 20 cm and
200 cm.
6.2 Durability and legibility of marking
IEC 61347-1:2024, 6.3 applies.
6.3 Built-in controlgear without an enclosure and integral controlgear
IEC 61347-1:2024, 6.4 applies.
7 Terminals
IEC 61347-1:2024, Clause 7 applies.

– 8 – IEC 61347-2-2:2024 © IEC 2024
8 Earthing
IEC 61347-1:2024, Clause 8 applies.
9 Protection against accidental contact with hazardous live parts
IEC 61347-1:2024, Clause 9 applies.
10 Insulation resistance and electric strength
IEC 61347-1:2024, Clause 10 applies.
11 Fault conditions
IEC 61347-1:2024, Clause 11 applies, together with the following compliance condition in
addition to IEC 61347-1:2024, 11.4.2:
The output voltage of the convertor shall not exceed the ELV limit after applying the fault
condition.
The output voltage of the convertor shall not exceed 115 % of the rated output voltage or 115 %
of the maximum of the rated output voltage range. Voltages measured within 1 s after applying
the fault condition are disregarded.
12 Construction
IEC 61347-1:2024, Clause 12 applies.
13 Creepage distances, clearances and distances through insulation
IEC 61347-1:2024, Clause 13 applies.
14 Screws, current-carrying parts and connections
IEC 61347-1:2024, Clause 14 applies.
15 Resistance to heat, fire and tracking
IEC 61347-1:2024, Clause 15 applies.

16 Thermal requirements
16.1 General
IEC 61347-1:2024, 16.1 applies, with the following addition:
The output voltage of the convertor shall not exceed the ELV limit after applying the fault
condition.
The output voltage of the convertor shall not exceed 115 % of the rated output voltage or 115 %
of the maximum of the rated output voltage range. Voltages measured within 1 s after applyi
...