IEC 60364-7-715:2011

IEC 60364-7-715 ®
Edition 2.0 2011-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage electrical installations –
Part 7-715: Requirements for special installations or locations – Extra-low-
voltage lighting installations

Installations électriques à basse tension –
Partie 7-715: Règles pour les installations et emplacements spéciaux –
Installations d'éclairage à très basse tension

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by
any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or
IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: inmail@iec.ch
Web: www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
 Catalogue of IEC publications: www.iec.ch/searchpub
The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).
It also gives information on projects, withdrawn and replaced publications.
 IEC Just Published: www.iec.ch/online_news/justpub
Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available
on-line and also by email.
 Electropedia: www.electropedia.org
The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions
in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
 Customer Service Centre: www.iec.ch/webstore/custserv
If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service
Centre FAQ or contact us:
Email: csc@iec.ch
Tel.: +41 22 919 02 11
Fax: +41 22 919 03 00
A propos de la CEI
La Commission Electrotechnique Internationale (CEI) est la première organisation mondiale qui élabore et publie des
normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications CEI
Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possédez
l’édition la plus récente, un corrigendum ou amendement peut avoir été publié.
 Catalogue des publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm
Le Catalogue en-ligne de la CEI vous permet d’effectuer des recherches en utilisant différents critères (numéro de référence,
texte, comité d’études,…). Il donne aussi des informations sur les projets et les publications retirées ou remplacées.
 Just Published CEI: www.iec.ch/online_news/justpub
Restez informé sur les nouvelles publications de la CEI. Just Published détaille deux fois par mois les nouvelles
publications parues. Disponible en-ligne et aussi par email.
 Electropedia: www.electropedia.org
Le premier dictionnaire en ligne au monde de termes électroniques et électriques. Il contient plus de 20 000 termes et
définitions en anglais et en français, ainsi que les termes équivalents dans les langues additionnelles. Egalement appelé
Vocabulaire Electrotechnique International en ligne.
 Service Clients: www.iec.ch/webstore/custserv/custserv_entry-f.htm
Si vous désirez nous donner des commentaires sur cette publication ou si vous avez des questions, visitez le FAQ du
Service clients ou contactez-nous:
Email: csc@iec.ch
Tél.: +41 22 919 02 11
Fax: +41 22 919 03 00
IEC 60364-7-715 ®
Edition 2.0 2011-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage electrical installations –
Part 7-715: Requirements for special installations or locations – Extra-low-
voltage lighting installations

Installations électriques à basse tension –
Partie 7-715: Règles pour les installations et emplacements spéciaux –
Installations d'éclairage à très basse tension

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX M
ICS 29.140.50; 91.140.50 ISBN 978-2-88912-841-9

– 2 – 60364-7-715 © IEC:2011
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
715 Extra-low-voltage lighting installations . 6
715.1 Scope . 6
715.2 Normative references . 6
715.4 Protection for safety . 7
715.41 Protection against electric shock . 7
715.414 Protective measure: extra-low-voltage provided by SELV and PELV . 7
715.42 Protection against thermal effects . 7
715.422.3 Locations with risks of fire due to the nature of processed or stored
materials . 7
715.422.106 Fire risk of transformers/convertors . 7
715.422.107 Fire risk due to short-circuit . 8
715.43 Protection against overcurrent . 8
715.430.104 Protection against overcurrent in ELV lighting installations . 8
715.5 Selection and erection of electrical equipment . 8
715.52 Wiring systems . 8
715.521 Types of wiring system . 8
715.521.106 Bare conductors . 9
715.521.107 Suspended systems . 9
715.523 Current-carrying capacities . 9
715.524 Cross-sectional areas of conductors . 9
715.525 Voltage drop in consumers' installations . 10
715.53 Isolation, switching and control . 10
715.530.3 General and common requirements . 10
715.536 Isolation and switching . 10
Annex A (informative) List of notes concerning certain countries . 11
Bibliography . 12

60364-7-715 © IEC:2011 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE ELECTRICAL INSTALLATIONS –

Part 7-715: Requirements for special installations or locations –
Extra-low-voltage lighting installations

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 60364-7-715 has been prepared by committee 64: Electrical
installations and protection against electric shock.
This second edition cancels and replaces the first edition, published in 1999, and constitutes
a technical revision.
The major technical changes with respect to the previous edition are listed below:
– clause numbering is aligned with present structure of IEC 60364;
– introduction of references to LED modules and their particular installation requirements;
– modification of requirements for cross-sectional area of conductors.

– 4 – 60364-7-715 © IEC:2011
The text of this standard is based on the following documents:
FDIS Report on voting
64/1807/FDIS 64/1815/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 parts in the IEC 60364 series, under the general title Low-voltage electrical
installations, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website 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.
60364-7-715 © IEC:2011 – 5 –
INTRODUCTION
The requirements of this part of IEC 60364 supplement, modify or replace certain of the
general requirements contained in Parts 1 to 6 of IEC 60364.
The clause numbering appearing after 715 refers to the corresponding parts or clauses of
IEC 60364, Parts 1 to 6. Numbering of clauses does not, therefore, necessarily follow
sequentially. Numbering of figures and tables takes the number of this part followed by a
sequential number.
The absence of reference to a part or clause means that the general requirements contained
in Parts 1 to 6 of IEC 60364 are applicable.

– 6 – 60364-7-715 © IEC:2011
LOW-VOLTAGE ELECTRICAL INSTALLATIONS –

Part 7-715: Requirements for special installations or locations –
Extra-low-voltage lighting installations

715 Extra-low-voltage lighting installations
715.1 Scope
The particular requirements of this part of IEC 60364 apply to the selection and erection of
extra-low-voltage lighting installations supplied from sources with a maximum rated voltage of
50 V a.c. or 120 V d.c.
NOTE 1 For the definition of an extra-low-voltage lighting system see IEC 60598-2-23.
NOTE 2 AC voltages are given as r.m.s. values.
715.2 Normative references
The following referenced documents are indispensable for the application 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 60364-4-41:2005, Low-voltage electrical installations – Part 4-41: Protection for safety –
Protection against electric shock
lEC 60364-4-42:2010, Low-voltage electrical installation – Part 4-42: Protection for safety –
Protection against thermal effects
IEC 60364-4-43:2008, Low-voltage electrical installation – Part 4-43: Protection for safety –
Protection against overcurrent
IEC 60364-5-52:2009, Low-voltage electrical installations – Part 5-52: Selection and erection
of electrical equipment – Wiring systems
IEC 60364-5-53:2001, Electrical installations of buildings – Part 5-53: Selection and erection
of electrical equipment – Isolation, switching and control
IEC 60364-5-55:2001, Electrical installations of buildings – Part 5-55: Selection and erection
of electrical equipment – Other equipment
IEC 60570:2003, Electrical supply track systems for luminaires
IEC 60598-2-23:1996, Luminaires – Part 2: Particular requirements – Section 23: Extra-low-
voltage lighting systems for filament lamps
IEC 60998-2-1:2002, Connecting devices for low-voltage circuits for household and similar
purposes – Part 2-1: Particular requirements for connecting devices as separate entities with
screw-type clamping units
IEC 60998-2-2:2002, Connecting devices for low-voltage circuits for household and similar
purposes – Part 2-2: Particular requirements for connecting devices as separate entities with
screwless-type clamping units
60364-7-715 © IEC:2011 – 7 –
IEC 61347-2-2:2000, Lamp controlgear – Part 2-2: Particular requirements for d.c. or a.c.
supplied electronic step-down convertors for filament lamps
IEC 61347-2-13:2006, Lamp controlgear – Part 2-13: Particular requirements for d.c. or a.c.
supplied eletronic controlgear for LED modules
IEC 61558-2-6:2009, 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
715.4 Protection for safety
715.41 Protection against electric shock
715.414 Protective measure: extra-low-voltage provided by SELV and PELV
Add the following:
For extra-low-voltage lighting installations only SELV shall be applied. Where bare conductors
are used, the maximum voltage shall be 25 V a.c. or 60 V d.c. according to 414.4.5.
The source of the ELV lighting installation can be one of the following:
– A safety isolating transformer complying with IEC 61558-2-6:2009.
Parallel operation of transformers in the secondary circuit is allowed only if they are also
paralleled in the primary circuit and the transformers have identical electrical characteristics.
– A safety isolating convertor complying with IEC 61347-2-2:2000, Annex I for incandescent
lamps, or IEC 61347-2-13:2006, Annex I for LED.
Parallel operation of convertors is not permitted.
715.42 Protection against thermal effects
715.422.3 Locations with risks of fire due to the nature of processed or stored
materials
Add the following:
The manufacturer's installation instructions shall be followed, including those relating to
mounting on flammable or non-flammable surfaces.
Luminaires and their accessories shall be designed and placed to avoid harmful heating of
materials or surroundings.
NOTE See also IEC 60364-5-55:2001, Clause 559.
Add the following:
715.422.106 Fire risk of transformers/convertors
Transformers shall be either:
– protected on the primary side by the protective device required in 715.422.107.2; or
– short-circuit proof (both inherently and non-inherently ), see IEC 60364-5-55, Clause 559,
Annex A for the symbol.
Electronic convertors shall comply with IEC 61347-2-2:2000 and, for LED-modules with
IEC 61347-2-13:2006, Annex I.
– 8 – 60364-7-715 © IEC:2011
NOTE It is recommended that converters marked with the symbol are used. The temperature value
limitation (of the convertor) within the triangle is given only as an example.
715.422.107 Fire risk due to short-circuit
715.422.107.1 If both circuit conductors are uninsulated, they shall be either:
– provided with a special protective device complying with the requirements of 715.422.107.2;
or
– supplied from a transformer or a convertor, the power of which does not exceed 200 VA;
or
– conductors of a system complying with IEC 60598-2-23:1996.
715.422.107.2 The special protective device against the risk of fire shall comply with the
following requirements:
– continuous monitoring of the power demand of the luminaires;
– automatic disconnection of the supply circuit within 0,3 s in case of a short-circuit or
failure which causes a power increase of more than 60 W;
– automatic disconnection while the supply circuit is operating with reduced power (for
example by gating control or a regulating process or a lamp failure) if there is a failure
which causes a power increase of more than 60 W;
– automatic disconnection in the case of switching on the supply circuit if there is a failure
which causes a power increase of more than 60 W;
– the special protective device shall be fail-safe.
NOTE Account needs to be taken of starting currents.
715.43 Protection against overcurrent
Add the following:
715.430.104 Protection against overcurrent in ELV lighting installations
The use of self-resetting overcurrent protective devices is permitted only for transformers up
to 50 VA.
715.5 Selection and erection of electrical equipment
715.52 Wiring systems
715.521 Types of wiring system
715.521.1
Replace the text by the following:
The following wiring systems shall be used:
– insulated conductors in conduit or cable trunking/ducting systems;
– rigid cables;
– flexible cables or cords;
– systems for ELV lighting according to IEC 60598-2-23:1996;
– track systems according to IEC 60570:2003;
– bare conductors (see clause 715.521.06).

60364-7-715 © IEC:2011 – 9 –
Where parts of the ELV lighting installation are accessible, the requirements of Clause 423
also apply.
Metallic structural parts of buildings, for example, pipe systems or parts of furniture, shall not
be used as live conductors.
Add the following:
715.521.106 Bare conductors
If the nominal voltage does not exceed 25 V a.c. or 60 V d.c., bare conductors may be used
provided that the extra-low-voltage lighting installation complies with the following
requirements:
– the lighting installation is designed, installed or enclosed in such a way that the risk of a
short-circuit is reduced to a minimum; and
– the conductors used have a minimum cross-sectional area according to 715.524; and
– the conductors or wires are not placed directly on combustible material.
For suspended bare conductors, at least one conductor and its terminals shall be insulated,
for that part of the circuit between the transformer and the protective device, to prevent a
short-circuit.
NOTE Where bare conductors are used, consideration should be given to the possible presence of combustible
material.
Add the following:
715.521.107 Suspended systems
Suspension devices for luminaires, including supporting conductors, shall be capable of
carrying five times the mass of the luminaires (including their lamps) intended to be
supported, but not less than 5 kg.
Terminations and connections of conductors shall be made by screw terminals or screwless
clamping devices complying with IEC 60998-2-1:2002 or IEC 60998-2-2:2002.
Safety of the installation due to expected stresses in the conductors shall be in accordance
with 559.5.2 of IEC 60364-5-55:2001.
Insulation piercing connectors and termination wires, with counterweights, hung over
suspended conductors shall not be used.
In the case of a suspended system with bare conductors it shall be fixed to walls or ceilings
by insulated fixing means and shall be continuously accessible throughout the route.
715.523 Current-carrying capacities
Add the following:
NOTE Values of current-carrying capacity for uninsulated conductors are under consideration.
715.524 Cross-sectional areas of conductors
Replace the text by the following:
The minimum cross-sectional area of the ELV conductors which are connected to the output
terminals or terminations of transformers/convertors shall be chosen according to the load
current.
– 10 – 60364-7-715 © IEC:2011
In the case of systems with luminaires suspended from the conductors, the minimum cross-
sectional area of the ELV conductors which are connected to the output terminals or
terminations of transformers/convertors shall be 4 mm , for mechanical reasons.
715.525 Voltage drop in consumers' installations
Replace the text by the following:
In ELV lighting installations, the voltage drop between the transformer and the furthest
luminaire shall not exceed 5 % of the nominal voltage of the ELV installation.
715.53 Isolation, switching and control
715.530.3 General and common requirements
Add the following:
715.530.3.104
Protective devices shall be easily accessible.
Protective devices may be located above false ceilings, which are movable or easily
accessible, provided that information is given about the presence and location of the device.
If the identification of a protective device for a circuit is not immediately evident, a sign or
diagram (label) close to the protective device shall identify the circuit and its purpose.
SELV sources, protective devices or similar equipment mounted above false ceilings or in a
similar place shall be permanently connected.
SELV sources and the
...