IEC 60598-2-23:2020

Luminaires - Part 2-23: Particular requirements - Extra-low-voltage lighting systems for ELV light sources

IEC 60598-2-23:2020 specifies requirements for extra-low-voltage lighting systems for ELV light sources, intended for ordinary interior use on supply voltages not exceeding 1 000 V. The luminaires, being connected in parallel, are supplied via freely suspended continuous supporting conductors or profiles, the current in the ELV part of the system not exceeding 25 A.
This second edition cancels and replaces the first edition published in 1996 and Amendment 1:2000. This edition constitutes a technical revision.
This edition includes the following technical changes with respect to the previous edition (there are no major technical changes, see Annex A):
a) The title has been modified to allow the inclusion of other light sources;
b) The scope has been updated to be aligned with the other parts of the IEC 60598-2 series and to include other light sources;
c) Normative references and the reference to transformer and controlgear standards have been updated;
d) The short circuit test (23.7.6.1 and 23.7.6.2) was removed and reference is now made to the same test in Part 1.

Luminaires - Partie 2-23: Exigences particulières - Systèmes d'éclairage à très basse tension pour sources de lumière TBT

L’IEC 60598-2-23:2020 spécifie les exigences pour les systèmes d’éclairage à très basse tension pour des sources de lumière TBT, prévues pour une utilisation ordinaire en intérieur, avec des tensions d’alimentation ne dépassant pas 1 000 V. Les luminaires, branchés en parallèle, sont alimentés par l’intermédiaire de conducteurs ou profils supports continus, librement suspendus. Le courant dans la partie TBT du système ne dépasse pas 25 A.
Cette deuxième édition annule et remplace la première édition parue en 1996 et son Amendement 1:2000. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques suivantes par rapport à l’édition précédente (il n’y a pas de modification technique majeure, voir Annexe A):
a) Le titre a été modifié pour permettre l'ajout d’autres sources de lumière;
b) Le domaine d’application a été mis à jour pour l'aligner sur celui des autres parties de la série IEC 60598-2 et pour inclure d’autres sources de lumière;
c) Les références normatives et la référence aux normes relatives aux transformateurs et aux appareillages de commande ont été mises à jour;
d) L’essai de court-circuit (23.7.6.1 et 23.7.6.2) a été supprimé et il est à présent fait référence au même essai dans la partie 1.

General Information

• Status: Published
• Publication Date: 19-Jul-2020
• ICS: 29.140.40 - Luminaires
• Technical Committee: SC 34D - Luminaires
• Drafting Committee: WG 1 - TC 34/SC 34D/WG 1
• Current Stage: PPUB - Publication issued
• Start Date: 20-Jul-2020
• Completion Date: 14-Aug-2020

Relations

• Revises: IEC 60598-2-23:1996 - Luminaires - Part 2: Particular requirements - Section 23: Extra low voltage lighting systems for filament lamps
• Effective Date: 05-Sep-2023
• Revises: IEC 60598-2-23:1996/AMD1:2000 - Amendment 1 - Luminaires - Part 2: Particular requirements - Section 23: Extra low voltage lighting systems for filament lamps
• Effective Date: 05-Sep-2023

IEC 60598-2-23:2020 Overview

IEC 60598-2-23:2020 is an international standard published by the International Electrotechnical Commission (IEC) that defines particular requirements for extra-low-voltage (ELV) lighting systems using ELV light sources. This standard applies specifically to lighting systems intended for ordinary interior use, operating at supply voltages not exceeding 1,000 V, with systems where luminaires are connected in parallel and powered via freely suspended continuous supporting conductors or profiles. The current in the ELV part of these systems must not exceed 25 A.

This second edition, published in 2020, replaces the first edition from 1996 and its Amendment 1:2000, incorporating a technical revision. Key updates include extending the scope to include a wider variety of light sources and aligning the requirements with other parts of the IEC 60598-2 series.

Key Topics Covered

• Scope and Application: Specifies requirements for ELV lighting systems, focusing on interior use with extra-low-voltage supply, ensuring safety and functionality for luminaires connected via suspended supporting conductors.
• System Components: Detailed requirements for system elements such as transformers, control gear, supporting conductors, connectors, auxiliary supports, and spacers.
• Safety and Construction: Important provisions around electrical safety, insulation resistance, creepage distances, clearances, earthing provisions, and protection against electric shock to mitigate risks in ELV lighting systems.
• Mechanical Requirements: Guidelines for appropriate mounting of supporting conductors, spacing of main and auxiliary supports, and fixture connections.
• Testing Procedures: Specifies mandatory type tests including endurance, thermal, insulation resistance, electric strength, resistance to heat, fire, dust, and moisture as per IEC 60598-1 and this particular part.
• Marking and Instructions: Requirements for clear and comprehensive installation instructions, marking of all parts, and specification of system components, facilitating correct installation and safe operation.

Practical Applications

IEC 60598-2-23:2020 is essential for manufacturers, designers, installers, and safety assessors involved with extra-low-voltage lighting systems such as:

• Interior Architectural Lighting: Particularly where luminaires are suspended from constructed supporting profiles or conductors for aesthetic and functional lighting.
• Retail and Commercial Spaces: Lighting installations requiring LED or other ELV light sources connected in parallel for flexibility and ease of maintenance.
• Specialized Lighting Kits and Systems: Commercially available lighting kits combining controlgear, transformers, wiring, and fittings prepared as a product system for easy deployment.
• Energy-efficient and Safe Lighting Design: Application in environments that require adherence to safety standards while utilizing ELV technology to minimize electrical hazard risks.

By following IEC 60598-2-23:2020, stakeholders ensure compliance with international safety, reliability, and performance standards, reducing equipment failures and hazards associated with ELV lighting systems.

Related Standards

This standard is designed to be used alongside and complemented by other IEC publications such as:

• IEC 60598-1: General requirements and tests for luminaires, providing foundational guidelines used in conjunction with Part 2-23.
• IEC 61347 series: Lamp controlgear standards specifying safety and performance for electronic transformers and LED drivers used in ELV lighting.
• IEC 61558 series: Safety requirements for transformers and power supply units used within lighting systems, vital for ensuring electrical safety.
• IEC TR 60083: Standards for plugs and socket-outlets, related to components connecting ELV lighting systems to mains supply.

Integration with these standards ensures comprehensive compliance coverage from component level to complete lighting system installations.

---

Keywords: IEC 60598-2-23, extra-low-voltage lighting systems, ELV light sources, luminaires, supporting conductors, safety standards, interior lighting, transformer, controlgear, electrical safety, lighting system installation, IEC standards.

Standards Content (Sample)

IEC 60598-2-23 ®
Edition 2.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Luminaires –
Part 2-23: Particular requirements – Extra-low-voltage lighting systems
for ELV light sources
Luminaires –
Partie 2-23: Exigences particulières – Systèmes d’éclairage à très basse tension
pour sources de lumière TBT:
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IEC 60598-2-23 ®
Edition 2.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Luminaires –
Part 2-23: Particular requirements – Extra-low-voltage lighting systems

for ELV light sources
Luminaires –
Partie 2-23: Exigences particulières – Systèmes d’éclairage à très basse tension

pour sources de lumière TBT:
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.140.40 ISBN 978-2-8322-8637-1

– 2 – IEC 60598-2-23:2020 © IEC 2020
CONTENTS
FOREWORD . 3
23.1 Scope . 5
23.2 Normative references . 5
23.3 Terms and definitions . 5
23.4 General test requirements . 7
23.5 Classification . 7
23.6 Marking . 7
23.7 Construction . 8
23.8 Creepage distances and clearances . 9
23.9 Provisions for earthing . 9
23.10 Terminals and electrical connections . 9
23.11 External and internal wiring . 10
23.12 Protection against electric shock . 10
23.13 Endurance tests and thermal tests . 10
23.14 Resistance to dust, solid objects and moisture . 11
23.15 Insulation resistance and electric strength . 11
23.16 Resistance to heat, fire and tracking . 11
Annex A (informative) Schedule of amended subclauses containing more serious/critical
requirements which require products to be retested . 12
Bibliography . 13

Figure 1 – Typical supporting methods for lighting systems . 7

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LUMINAIRES –
Part 2-23: Particular requirements – Extra-low-voltage
lighting systems for ELV light sources

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,
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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
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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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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 60598-2-23 has been prepared by subcommittee 34D: Luminaires,
of IEC technical committee 34: Lamps and related equipment.
This second edition cancels and replaces the first edition published in 1996 and
Amendment 1:2000. This edition constitutes a technical revision.
This edition includes the following technical changes with respect to the previous edition (there
are no major technical changes, see Annex A):
a) The title has been modified to allow the inclusion of other light sources;
b) The scope has been updated to be aligned with the other parts of the IEC 60598-2 series
and to include other light sources;
c) Normative references and the reference to transformer and controlgear standards have
been updated;
d) The short circuit test (23.7.6.1 and 23.7.6.2) was removed and reference is now made to
the same test in Part 1.
– 4 – IEC 60598-2-23:2020 © IEC 2020
The text of this International Standard is based on the following documents:
FDIS Report on voting
34D/1543/FDIS 34D/1557/RVD
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
This Part 2-23 is to be used in conjunction with the latest edition of IEC 60598-1 and its
amendment(s). It was established on the basis of the ninth edition (20XX) of that standard
(under preparation).
NOTE 1 When "Part 1" is mentioned in this document, it refers to IEC 60598-1.
A list of all parts in the IEC 60598 series, published under the general title Luminaires can be
found on the IEC website.
NOTE 2 In this document, the following print type is used:
• compliance statements: in italic type
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
LUMINAIRES –
Part 2-23: Particular requirements – Extra-low-voltage
lighting systems for ELV light sources

23.1 Scope
This part of IEC 60598 specifies requirements for extra-low-voltage lighting systems for ELV
light sources, intended for ordinary interior use on supply voltages not exceeding 1 000 V. The
luminaires, being connected in parallel, are supplied via freely suspended continuous
supporting conductors or profiles, the current in the ELV part of the system not exceeding 25 A.
23.2 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 TR 60083, Plugs and socket-outlets for domestic and similar general use standardized in
member countries of IEC
IEC 60598-1, Luminaires – Part 1: General requirements and tests
IEC 61347-2-2, Lamp controlgear – Part 2-2: Particular requirements for d.c. or a.c. supplied
electronic step-down convertors for filament lamps
IEC 61347-2-13, Lamp controlgear – Part 2-13: Particular requirements for d.c. or a.c. supplied
electronic controlgear for LED modules
IEC 61558-2-6, Safety of transformers, reactors, power supply units and similar products for
supply voltages up to 1 100 V – Part 2-6: Particular requirements and tests for safety isolating
transformers and power supply units incorporating safety isolating transformers
IEC 61558-2-16, Safety of transformers, reactors, power supply units and similar products for
supply voltages up to 1 100 V – Part 2-16: Particular requirements and tests for switch mode
power supply units and transformers for switch mode power supply units
23.3 Terms and definitions
For the purposes of this document, the terms and definitions given in Part 1 and the following
apply (see Figure 1).
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp

– 6 – IEC 60598-2-23:2020 © IEC 2020
23.3.1
extra-low-voltage lighting system
lighting system in kit form for light sources consisting of a transformer/convertor or controlgear,
supporting conductors and luminaires, as well as all the necessary fixing devices and the
electrical/mechanical connectors
23.3.2
supporting conductor
conductive span wire or profile freely spanned or mounted between the main points of support,
serving to supply the luminaires, and carrying the mass of the luminaires of the extra-low-
voltage lighting system
23.3.3
main support
device ensuring a sufficient mechanical connection of the supporting conductor(s) with the
appropriate parts of the building in which the extra-low-voltage lighting system is to be used
Note 1 to entry: Auxiliary supports may be necessary between the main supports.
23.3.4
auxiliary support
device along the supporting conductor to hold it in its intended position
23.3.5
spacer
device maintaining the supporting conductors at the intended separation distance
23.3.6
connector for supporting conductor
component for connecting electrically the supporting conductor(s) to the transformer/convertor
or controlgear
23.3.7
luminaire connector
component for connecting electrically and mechanically the luminaire to the supporting
conductor
Figure 1 – Typical supporting methods for lighting systems
23.4 General test requirements
The provisions of Section 0 of Part 1 apply. The tests described in each appropriate section of
Part 1 shall be carried out in the order listed in this document.
Type tests shall be carried out on the complete extra-low-voltage lighting system as provided
by the manufacturer.
23.5 Classification
Extra-low-voltage lighting systems shall be classified in accordance with the provisions of
Section 2 of Part 1, together with the following requirement.
Luminaires in extra-low-voltage lighting systems shall be class III.
23.6 Marking
The provisions of Section 3 of Part 1 apply, together with the following requirements.
The extra-low-voltage lighting system shall be accompanied by installation instructions,
including a complete list of all parts belonging to the system. The number and type of each part
shall be clearly shown.
– 8 – IEC 60598-2-23:2020 © IEC 2020
The installation instructions shall clearly and unambiguously state:
a) how the extra-low-voltage lighting system is to be mounted, and in particular, the maximum
permitted distance between the main supports and the spacing of auxiliary supports;
b) whether special requirements, for example due to characteristics of the
transformer/convertor/controlgear, shall be observed for components of an existing mains
supply to which the extra-low-voltage lighting system is to be connected, for example
socket-outlets, switches, dimmers;
c) that the supporting conductors of different extra-low-voltage lighting systems shall be
mounted so as not to be able to come into contact with each other, where applicable;
d) that the extra-low-voltage lighting system shall not be extended beyond the number of
luminaires belonging to the complete set, and that only parts assigned by the manufacturer
shall be used;
e) that no additional attachments, for example for decorative purposes, shall be used;
f) that the following warning statement be provided:
WARNING – To avoid the risk of overheating and fire, do not bridge the conductors;
g) the positions or spacings for the connections of luminaires (if applicable).
23.7 Construction
The provisions of Section 4 of Part 1 apply, together with the requirements of 23.7.1 to 23.7.11.
23.7.1 The whole set of the extra-low-voltage lighting system, as delivered by the
manufacturer, shall be complete, including the transformer or convertor/controlgear. The
secondary side of the extra-low-voltage lighting system shall comply with the requirements of
SELV.
Compliance is checked by mounting as in normal use, inspection and by the applicable
measurements and tests required by this document.
23.7.2 Transformers, power supply units or switch mode power supply units provided with
safety extra-low-voltage lighting systems shall be of the safety isolating type, complying with
the requirements of IEC 61558-2-6 or IEC 61558-2-16, and having a rated output voltage not
exceeding 25 V RMS or 60 V ripple free DC.
23.7.3 Convertors/controlgear provided with safety extra-low-voltage lighting systems shall be
of the safety isolating type, complying with IEC 61347-2-2 or IEC 61347-2-13, and having a
rated output voltage not exceeding 25 V RMS or 60 V ripple free DC.
23.7.4 Supporting conductors shall be continuous and shall be capable of supporting five
times the mass of the luminaires (including their lamps) intended to be connected to them.
Compliance is checked by applying a load at 90° to the conductors to the mid-point of a
maximum span equal to five times the weight of the luminaires and lamps supplied with the
system, with a minimum load of 10 kg, for a period of 1 h, applied simultaneously to both
conductors. After the test, the load is removed and the deflection from the normal position shall
not exceed 10 % of the distance between the supporting conductors measured before applying
the load.
If pin contacts or edge contacts are used in the system, then the supporting conductors shall
have been subjected to 25 piercings at different places before the test.
23.7.5 Luminaire connectors shall be capable of supporting five times the mass of the
luminaire (including its light source) without permanent deformation.

Compliance is checked by the test of 4.14.1 of Part 1 with a minimum load of 1,5 kg. The test
shall be carried out after the test of 23.10.1, if applicable.
23.7.6 Short-circuit protection: Adequate means shall be provided to prevent impairing of
safety due to unintended short-circuiting of uninsulated accessible SELV conductors of opposite
polarity.
Compliance is checked by the test of 4.26.2 of Part 1.
23.7.7 Lampholders shall comply with the relevant IEC specifications.
Compliance is checked by inspection.
23.7.8 Instructions for use provided by the lamp manufacturers shall be observed.
Compliance is checked by inspection.
23.7.9 Electrical connections to supporting conductors shall not be subject to mechanical
tension.
Compliance is checked by inspection.
23.7.10 Provisions shall be made for the extra-low-voltage lighting system to be insulated from
the supporting structure.
23.7.11 The rated current of the system shall be limited to 25 A.
Compliance is checked by inspection and by rated data.
23.8 Creepage distances and clearances
The provisions of Section 11 of Part 1 apply.
23.9 Provisions for earthing
The provisions of Section 7 of Part 1 apply.
23.10 Terminals and electrical connections
The provisions of Sections 14 and 15 of Part 1, including the electrical tests, apply, together
with the requirements of 23.10.1 to 23.10.3.
23.10.1 Connectors for luminaires may be connected to the supporting conductor by means
of pin contacts or edge contacts which penetrate the insulation, if any, of the supporting
conductor, and provide the electric contact with the conductor.
Compliance is checked by the test of 23.7.5 after that of 23.7.4.
23.10.2 If the supporting conductor is intended to be connected to the
transformer/convertor/controlgear with a plug, the plug shall not be interchangeable with plugs
and socket-outlets in accordance with IEC TR 60083.
Compliance is checked by inspection.

– 10 – IEC 60598-2-23:2020 © IEC 2020
23.10.3 Good contact shall be maintained between all moveable electrical contact points in
the system.
Compliance is checked by placing the luminaire or movable contact (with all parts giving a
mechanical and electrical load to the contact connected) in five separate positions, observing
the manufacturer’s instructions. A current of 1,5 times the rated current shall be passed through
each individual connection and, after 1 min, the voltage drop in each position shall not exceed
50 mV.
23.11 External and internal wiring
The provisions of Section 5 of Part 1 apply, together with the following requirement.
Supporting conductors shall be made of a suitable current-carrying material.
Compliance is checked by the test of 23.13.1.
23.12 Protection against electric shock
The provisions of Section 8 of Part 1 apply, together with the following requirement.
The supply voltage of the supporting conductors shall not exceed, for alternating current, 25 V
RMS and for direct current, 60 V ripple-free.
23.13 Endurance tests and thermal tests
The provisions of Section 12 of Part 1 apply, together with the requirements of 23.13.1 and
23.13.2.
23.13.1 The extra-low-voltage lighting system shall be tested in normal operation at 1,06 times
its nominal supply voltage, or at 1,06 times the mean value of its nominal supply voltage range,
with the exception of transformers/convertors or controlgear marked t /t , which shall be tested
w c
at their nominal voltage or at the mean value of the nominal supply voltage range.
Maximum surface temperatures of bare conductors in the output circuit shall not exceed 70 °C.
In the case of insulated conductors, the upper limit is the maximum temperature permitted for
the insulation used.
NOTE For details of t marking, refer to IEC 61347-2-8 or IEC 61558-2-6 as appropriate. For details of t marking,
w c
refer to IEC 61347-2-2 or IEC 61347-2-13 as appropriate.
23.13.2 During the test for abnormal operation, the extra-low-vol
...