IEC 60364-5-55:2011
(Main)Electrical installations of buildings - Part 5-55: Selection and erection of electrical equipment - Other equipment
Electrical installations of buildings - Part 5-55: Selection and erection of electrical equipment - Other equipment
IEC 60364-5-55:2011 covers requirements for the selection and erection of low-voltage generating sets and for the selection and erection of luminaires and lighting installations intended to be part of the fixed installation. This second edition cancels and replaces the first edition, published in 2001, its Amendment 1 (2001) and its Amendment 2 (2008). The major technical changes with respect to the previous edition are:
- additional requirements for connection of luminaires to the fixed wiring;
- modification of requirements regarding the fixing of luminaires;
- inclusion of alternative solutions for connecting devices used for through wiring and for connection of luminaires to the supply;
- withdrawal of Clause 556, as IEC 60364-5-56 now covers this matter.
Installations électriques des bâtiments - Partie 5-55: Choix et mise en oeuvre des matériels électriques - Autres matériels
La CEI 60364-5-55:2011 couvre les exigences pour le choix et la mise en oeuvre des groupes générateurs basse tension et est applicable au choix et à la mise en oeuvre des luminaires et des installations d'éclairage destinés à faire partie de l'installation fixe. Cette seconde édition annule et remplace la première édition, publiée en 2001, son Amendement 1 (2001) et son Amendement 2 (2008). Les modifications principales par rapport à l'édition précédente sont:
- des exigences supplémentaires pour la connexion des luminaires à l'installation fixe;
- des modifications d'exigences concernant la fixation des luminaires;
- l'ajout de solutions alternatives pour les dispositifs de connexion utilisés pour le câblage passant et pour la connexion de luminaires au réseau d'alimentation;
- la suppression de l'Article 556, maintenant couvert par CEI 60364-5-56.
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IEC 60364-5-55 ®
Edition 2.0 2011-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical installations of buildings –
Part 5-55: Selection and erection of electrical equipment – Other equipment
Installations électriques des bâtiments –
Partie 5-55: Choix et mise en œuvre des matériels électriques – Autres matériels
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IEC 60364-5-55 ®
Edition 2.0 2011-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical installations of buildings –
Part 5-55: Selection and erection of electrical equipment – Other equipment
Installations électriques des bâtiments –
Partie 5-55: Choix et mise en œuvre des matériels électriques – Autres matériels
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX U
ICS 91.140 ISBN 978-2-88912-845-7
– 2 – 60364-5-55 © IEC:2011
CONTENTS
FOREWORD . 3
550 Introduction . 5
550.1 Scope . 5
550.2 Normative references . 5
550.3 Terms and definitions . 6
551 Low-voltage generating sets . 7
551.1 Scope . 7
551.2 General requirements . 8
551.3 Protective measure: extra-low-voltage provided by SELV and PELV . 9
551.4 Fault protection (protection against indirect contact) . 9
551.5 Protection against overcurrent . 10
551.6 Additional requirements for installations where the generating set
provides a supply as a switched alternative to the normal supply to the
installation . 11
551.7 Additional requirements for installations where the generating set may
operate in parallel with other sources including systems for distribution
of electricity to the public . 11
551.8 Requirements for installations incorporating stationary batteries . 12
559 Luminaires and lighting installations . 13
559.1 Scope . 13
559.2 Terms and definitions . 13
559.3 General requirements for installations . 14
559.4 Protection of the surroundings against thermal effects . 14
559.5 Wiring systems for lighting installations . 14
559.6 Independent lamp controlgear, e.g. ballasts . 16
559.7 Compensation capacitors . 16
559.8 Protection against electric shock for display stands for luminaires . 16
559.9 Stroboscopic effect . 16
559.10 Ground recessed luminaires . 17
Annex A (informative) List of notes concerning certain countries . 18
Annex B (informative) Explanation of symbols used in luminaires, in controlgear for
luminaires and in the installation of the luminaires . 24
Bibliography . 26
60364-5-55 © IEC:2011 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_______________
ELECTRICAL INSTALLATIONS OF BUILDINGS –
Part 5-55: Selection and erection of electrical equipment –
Other equipment
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
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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) 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 60364-5-55 has been prepared by IEC technical committee 64:
Electrical installations and protection against electric shock.
This second edition cancels and replaces the first edition, published in 2001, its Amendment 1
(2001) and its Amendment 2 (2008).
The major technical changes with respect to the previous edition are listed below:
– additional requirements for connection of luminaires to the fixed wiring;
– modification of requirements regarding the fixing of luminaires;
– inclusion of alternative solutions for connecting devices used for through wiring and for
connection of luminaires to the supply;
– withdrawal of Clause 556, as IEC 60364-5-56 now covers this matter.
– 4 – 60364-5-55 © IEC:2011
The text of this standard is based on the following documents:
FDIS Report on voting
64/1805/FDIS 64/1813/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.
60364-5-55 © IEC:2011 – 5 –
ELECTRICAL INSTALLATIONS OF BUILDINGS –
Part 5-55: Selection and erection of electrical equipment –
Other equipment
550 Introduction
550.1 Scope
This part of IEC 60364 covers requirements for the selection and erection of low-voltage
generating sets and for the selection and erection of luminaires and lighting installations
intended to be part of the fixed installation.
550.2 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 60050-195, International Electrotechnical Vocabulary – Part 195: Earthing and protection
against electric shock
IEC 60050-826, International Electrotechnical Vocabulary – Part 826: Electrical installations
IEC 60079 (all parts), Explosive atmospheres
IEC 60245-3, Rubber insulated cables – Rated voltages up to and including 450/750 V –
Part 3: Heat resistant silicone insulated cables
IEC 60331-11, Tests for electric cables under fire conditions – Circuit integrity – Part 11:
Apparatus – Fire alone at a flame temperature of at least 750 °C
IEC 60331-21, Tests for electric cables under fire conditions – Circuit integrity – Part 21:
Procedures and requirements – Cables of rated voltage up to and including 0,6/1,0 kV
IEC 60364-1:2005, Low-voltage electrical installations – Part 1: Fundamental principles,
assessment of general characteristics, definitions
IEC 60364-4-41:2005, Low-voltage electrical installations – Part 4-41: Protection for safety –
Protection against electric shock
IEC 60364-4-42, Low-voltage electrical installations – Part 4-42: Protection for safety –
Protection against thermal effects
IEC 60364-4-43, Low-voltage electrical installations – Part 4-43: Protection for safety –
Protection against overcurrent
IEC 60364-5-53:2001, Electrical installations of buildings – Part 5-53: Selection and erection
of electrical equipment – Isolation, switching and control
IEC 60364-7-712, Electrical installations of buildings – Part 7-712: Requirements for special
installations or locations – Solar photovoltaic (PV) power supply systems
IEC 60364-7-717, Low-voltage electrical installations – Part 7-717: Requirements for special
installations or locations – Mobile or transportable units
IEC 60417 (all parts), Graphical symbols for use on equipment
– 6 – 60364-5-55 © IEC:2011
IEC 60570, Electrical supply track systems for luminaires
IEC 60598 (all parts), Luminaires
IEC 60598-2-13:2006, Luminaires – Part 2-13: Particular requirements – Ground recessed
luminaires
IEC 60598-2-22:1997, Luminaires – Part 2-22: Particular requirements – Luminaires for
emergency lighting
IEC 60670 (all parts), Boxes and enclosures for electrical accessories for household and
similar fixed electrical installations
IEC 60670-21, Boxes and enclosures for electrical accessories for household and similar
fixed electrical installations – Part 21: Particular requirements for boxes and enclosures with
provision for suspension means
IEC 60702-1, Mineral insulated cables and their terminations with a rated voltage not
exceeding 750 V – Part 1: Cables
IEC 60702-2, Mineral insulated cables and their terminations with a rated voltage not
exceeding 750 V – Part 2: TÈerminations
IEC 60998 (all parts), Connecting devices for low-voltage circuits for household and similar
purposes – Part 1: General requirements
IEC 61048:2006, Auxiliaries for lamps – Capacitors for use in tubular fluorescent and other
discharge lamp circuits – General and safety requirements
IEC 61535, Installation couplers intended for permanent connection in fixed installations
IEC 61995 (all parts), Devices for the connection of luminaires for household and similar
purposes
ISO 8528-12, Reciprocating internal combustion engine driven alternating current generating
sets – Part 12: Emergency power supply to safety services
550.3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
550.3.1
self-contained battery unit
unit comprising a battery and a charging and testing unit
550.3.2
non-maintained mode
operating mode of electrical equipment, essential for safety services, operating only when the
normal supply fails
550.3.3
maintained mode
operating mode of electrical equipment, essential for safety services, operating at all times
550.3.4
safety services
those services in a building which are essential
60364-5-55 © IEC:2011 – 7 –
– for the safety of persons,
– for avoiding damage to the environment or other material
NOTE Examples of safety services include
− emergency (escape) lighting,
− fire pumps,
− fire brigade lifts,
− alarm systems, such as fire alarms, smoke alarms, CO alarms and intruder alarms,
− evacuation systems,
− smoke extraction systems,
− essential medical equipment.
550.3.5
electrical safety source
source intended to maintain the supply to electrical equipment essential for the safety
services
550.3.6
electrical supply system for safety services
see IEC 60050-826
550.3.7
rated operating time of a safety source
operating time for which a safety source is designed under normal operating conditions.
551 Low-voltage generating sets
551.1 Scope
This clause provides requirements for the selection and erection of low-voltage and extra-low
voltage generating sets intended to supply, either continuously or occasionally, all or part of
the installation. Requirements are also included for installations with the following supply
arrangements:
– supply to an installation which is not connected to a system for distribution of electricity to
the public;
– supply to an installation as an alternative to a system for distribution of electricity to the
public;
– supply to an installation in parallel with a system for distribution of electricity to the public
supply;
– appropriate combinations of the above.
This part does not apply to self-contained items of extra-low voltage electrical equipment
which incorporate both the source of energy and the energy-using load and for which a
specific product standard exists that includes the requirements for electrical safety.
NOTE Requirements of the electricity distributor should be ascertained before a generating set is installed in an
installation that is connected to a system for distribution of electricity to the public.
551.1.1 Generating sets with the following power sources are considered:
– combustion engines;
– turbines;
– electric motors;
– 8 – 60364-5-55 © IEC:2011
– photovoltaic cells (IEC 60364-7-712 also applies);
– electrochemical accumulators;
– other suitable sources.
551.1.2 Generating sets with the following electrical characteristics are considered:
– mains-excited and separately excited synchronous generators;
– mains-excited and self-excited asynchronous generators;
– mains-commutated and self-commutated static converters with or without by-pass
facilities;
– generating sets with other suitable electrical characteristics.
551.1.3 The use of generating sets for the following purposes is considered:
– supply to permanent installations;
– supply to temporary installations;
– supply to portable equipment which is not connected to a permanent installation;
– supply to mobile units (IEC 60364-7-717 also applies).
551.2 General requirements
551.2.1 The means of excitation and commutation shall be appropriate for the intended use
of the generating set and the safety and proper functioning of other sources of supply shall
not be impaired by the generating set.
NOTE See 551.7 for particular requirements where the generating set may operate in parallel with a system for
the distribution of electricity to the public.
551.2.2 The prospective short-circuit current and prospective earth fault current shall be
assessed for each source of supply or combination of sources which can operate
independently of other sources or combinations. The short-circuit breaking capacity of
protective devices within the installation and, where appropriate, connected to a system for
distribution of electricity to the public, shall not be exceeded for any of the intended methods
of operation of the sources.
NOTE Attention should be given to the power factor specified for protective devices in the installation.
551.2.3 The capacity and operating characteristics of the generating set shall be such that
danger or damage to equipment does not arise after the connection or disconnection of any
intended load as a result of the deviation of the voltage or frequency from the intended
operating range. Means shall be provided to automatically disconnect such parts of the
installation as may be necessary if the capacity of the generating set is exceeded.
NOTE 1 Attention should be given to the size of individual loads as a proportion of the capacity of the generating
set and to motor starting currents.
NOTE 2 Attention should be given to the power factor specified for protective devices in the installation.
NOTE 3 The installation of a generating set within an existing building or installation may change the conditions
of external influence for the installation (see IEC 60364-1), for example by the introduction of moving parts, parts
at high temperature or by the presence of inflammable fluids and noxious gases, etc.
551.2.4 Provision for isolation shall meet the requirements of Clause 537 for each source or
combination of sources of supply.
60364-5-55 © IEC:2011 – 9 –
551.3 Protective measure: extra-low-voltage provided by SELV and PELV
551.3.1 Additional requirements for SELV and PELV where the installation
is supplied from more than one source
Where a SELV or PELV system may be supplied by more than one source, the requirements
of 414.3 of IEC 60364-4-41:2005 shall apply to each source. Where one or more of the
sources is earthed, the requirements for PELV systems in 414.4 of IEC 60364-4-41:2005 shall
apply.
If one or more of the sources does not meet the requirements of 414.3, the system shall be
treated as a FELV system and the requirements of 411.7 of IEC 60364-4-41:2005 shall apply.
551.3.2 Additional requirements where it is necessary to maintain the supply
to an extra-low voltage system
Where it is necessary to maintain the supply to an extra-low voltage system following the loss
of one or more sources of supply, each source of supply or combination of sources of supply
which can operate independently of other sources or combinations shall be capable of
supplying the intended load of the extra-low voltage system. Provisions shall be made so that
the loss of low-voltage supply to an extra-low voltage source does not lead to danger or
damage to other extra-low voltage equipment.
NOTE Such precautions may be necessary in supplies for safety services (see Clause 35 of IEC 60364-1:2005).
551.4 Fault protection (protection against indirect contact)
551.4.1 Fault protection shall be provided for the installation in respect of each source of
supply or combination of sources of supply that can operate independently of other sources or
combinations of sources.
The fault protective provisions shall be selected or precautions shall be taken to ensure that
where fault protective provisions are achieved in different ways within the same installation or
part of an installation according to the active sources of supply, no influence shall occur or
conditions arise that could impair the effectiveness of the fault protective provisions.
NOTE This might, for example, require the use of a transformer providing electrical separation between parts of
the installation using different earthing systems.
551.4.2 The generating set shall be connected so that any provision within the installation
for protection by residual current devices in accordance with IEC 60364-4-41 remains
effective for every intended combination of sources of supply.
NOTE Connection of live parts of the generator with earth may affect the protective measures.
551.4.3 Protection by automatic disconnection of supply
551.4.3.1 General
Where the protective measure automatic disconnection of supply is used for protection
against electric shock, the requirements of Clause 411 of IEC 60364-4-41:2005 apply, except
as modified for the particular cases given in 551.4.3.2 or 551.4.3.3.
551.4.3.2 Additional requirements for installations where the generating set provides
a supply as a switched alternative to the normal supply to the installation
Protection by automatic disconnection of supply shall not rely upon the connection to the
earthed point of the distribution system when the generator is operating as a switched
alternative. A suitable means of earthing shall be provided.
– 10 – 60364-5-55 © IEC:2011
551.4.3.3 Additional requirements for installations incorporating static converters
551.4.3.3.1 Where fault protection for parts of the installation supplied by the static
converter relies upon the automatic closure of the by-pass switch and the operation of
protective devices on the supply side of the by-pass switch is not within the time required
by Clause 411 of IEC 60364-4-41:2005, supplementary equipotential bonding shall be
provided between simultaneously accessible exposed-conductive-parts and extraneous-
conductive-parts on the load side of the static converter in accordance with 415.2 of
IEC 60364-4-41:2005.
The resistance of supplementary equipotential bonding conductors required between
simultaneously accessible conductive parts shall fulfill the following condition:
50 V
R≤
I
a
where
I is the maximum earth fault current which can be supplied by the static converter alone for
a
a period of up to 5 s.
NOTE Where such equipment is intended to operate in parallel with a system for distribution of electricity to the
public, the requirements of 551.7 also apply.
551.4.3.3.2 Precautions shall be taken or equipment shall be selected so that the correct
operation of protective devices is not impaired by d.c. currents generated by a static converter
or by the presence of filters.
551.4.3.3.3 A means of isolation shall be installed on both sides of a static converter.
This requirement does not apply on the power source side of a static converter which is
integrated in the same enclosure as the power source.
551.5 Protection against overcurrent
551.5.1 Where overcurrent protection of the generating set is required, it shall be located as
near as practicable to the generator terminals.
NOTE The contribution to the prospective short-circuit current by a generating set may be time-dependent and
may be much less than the contribution made by a system where the source is a mv/lv transformer.
551.5.2 Where a generating set is intended to operate in parallel with another source of
supply, including a supply from a system for distribution of electricity to the public, or where
two or more generating sets may operate in parallel, harmonic currents shall be limited so that
the thermal rating of conductors is not exceeded.
The effects of harmonic currents may be limited as follows:
– the selection of generating sets with compensated windings;
– the provision of a suitable impedance in the connection to generator star points;
– the provision of switches which interrupt the circuit but which are interlocked so that at all
times fault protection is not impaired;
– the provision of filtering equipment;
– other suitable means.
NOTE 1 Consideration should be given to the maximum voltage which may be produced across an impedance
connected to limit harmonics.
60364-5-55 © IEC:2011 – 11 –
NOTE 2 Monitoring equipment complying with IEC 61557-12 provides information on level of disturbances
resulting from the presence of harmonics.
551.6 Additional requirements for installations where the generating set provides
a supply as a switched alternative to the normal supply to the installation
551.6.1 Precautions complying with the relevant requirements of IEC 60364-5-53 for
isolation shall be taken, so that the generator cannot operate in parallel with the public supply
system for distribution of electricity to the public. Suitable precautions may include:
– an electrical, mechanical or electro-mechanical interlock between the operating
mechanisms or control circuits of the change-over switching devices;
– a system of locks with a single transferable key;
– a three-position, break-before-make, change-over switch;
– an automatic change-over switching device with a suitable interlock;
– other means providing equivalent security of operation.
NOTE Isolation should include supplies to the control circuits of the generator.
551.6.2 For TN-S systems where the neutral is not switched, any residual current device
shall be positioned to avoid incorrect operation due to the existence of any parallel neutral-
earth path.
NOTE 1 It may be desirable in TN systems to disconnect the neutral of the installation from the neutral or PEN of
the system for distribution of electricity to the public to avoid disturbances such as induced voltage surges caused
by lightning.
NOTE 2 See also 444.4.7 of IEC 60364-4-44:2007.
551.7 Additional requirements for installations where the generating set may
operate in parallel with other sources including systems for distribution of
electricity to the public
551.7.1 Where a generating set is used as an additional source of supply in parallel with
another source, protection against thermal effects in accordance with IEC 60364-4-42 and
protection against overcurrent in accordance with IEC 60364-4-43 shall remain effective in all
situations.
Except where an uninterruptible power supply is provided to supply specific items of current
using equipment within the final circuit to which it is connected, such a generating set shall be
installed on the supply side of all the protective devices for the final circuits of the installation.
A generating set used as an additional source of supply in parallel with another
551.7.2
source shall be installed:
– on the supply side of all the protective devices for the final circuits of the installation, or
– on the load side of all the protective devices for a final circuit of the installation, but in this
case all the following additional requirement shall be fulfilled:
a) the conductors of the final circuit shall meet the following requirement:
I ≥ I + I
z n g
where
I is the current-carrying capacity of the final circuit conductors;
z
I is the rated current of the protective device of the final circuit;
n
I is the rated output current of the generating set; and
g
– 12 – 60364-5-55 © IEC:2011
b) a generating set shall not be connected to a final circuit by means of a plug and
socket; and
c) a residual current device providing protection of the final circuit in accordance with
Clause 411 or Clause 415 of IEC 60364-4-41:2005 shall disconnect all live conductors
including the neutral conductor; and
d) the line and neutral conductors of the final circuit and of the generating set shall not
be connected to earth downstream of the protective device of the final circuit.
NOTE Where the generating set is installed in a final circuit on the load side of all the protective devices for that
final circuit, except where the protective devices for the final circuit disconnect the line and the neutral conductors,
the disconnection time in accordance with 411.3.2 of IEC 60364-4-41:2005 is the combination of the disconnection
time of the protective device for the final circuit and the time taken for the output voltage of the generating set to
be reduced to less than 50 V.
551.7.3 In selecting and using a generating set to run in parallel with another source,
including the system for distribution of electricity to the public, care shall be taken to avoid
adverse effects to that system and to other installations in respect of power factor, voltage
changes, harmonic distortion, d.c. current injection, unbalance, starting, synchronizing or
voltage fluctuation effects. In the case of a system for distribution of electricity to the public,
the distributor shall be consulted in respect of particular requirements. Where synchronization
is necessary, the use of automatic synchronizing systems which consider frequency, phase
and voltage is to be preferred.
551.7.4 Where a generating set is intended to run in parallel with the system for distribution
of electricity to the public, means of automatic switching shall be provided to disconnect the
generating set from the system for distribution of electricity to the public in the event of loss of
that supply or deviation of the voltage or frequency at the supply terminals from values
declared for normal supply.
The type of protection and the sensitivity and operating times depend upon the protection of
the system for distribution of electricity to the public and the number of generating sets
connected and shall be agreed by the distributor.
In case of presence of static converters, the means of switching shall be provided on the load
side of this static converter.
551.7.5 Where a generating set is intended to run in parallel with the system for distribution
of electricity to the public, means shall be provided to prevent the connection of a generating
set to the system for distribution of electricity to the public in the event of loss of that supply
or deviation of the voltage or frequency at the supply terminals from values declared for
normal supply.
551.7.6 Where a generating set is intended to run in parallel with the system for distribution
of electricity to the public, means shall be provided to enable the generating set to be isolated
from the system for distribution of electricity to the public. The accessibility of this means of
isolation shall comply with national rules and distribution system operator requirements.
551.7.7 Where a generating set may also operate as switched alternative to the distribution
system, the installation shall also comply with 551.6.
551.8 Requirements for installations incorporating stationary batteries
551.8.1 Stationary batteries shall be installed so that they are accessible only to skilled or
instructed persons.
NOTE This generally requires the battery to be installed in a secure location, or, for smaller batteries, a secure
enclosure.
The location or enclosure shall be adequately ventilated.
60364-5-55 © IEC:2011 – 13 –
551.8.2 Battery connections shall have basic protection by insulation or enclosures or shall
be arranged so that two bare conductive parts having between them a potential difference
exceeding 120 V cannot be inadvertently touched simultaneously.
559 Luminaires and lighting installations
559.1 Scope
The particular requirements of this clause apply to the selection and erection of luminaires
and lighting installations intended to be part of the fixed installation.
Additional requirements for specific types of lighting installations are covered in
– IEC 60364-7-702 for installations in swimming pools and fountains;
– IEC 60364-7-711 for installations in exhibitions, shows and stands;
– IEC 60364-7-713 for electrical installations in furniture;
– IEC 60364-7-714 for outdoor lighting installations;
– IEC 60364-7-715 for extra-low-voltage lighting installations.
The requirements of this clause do not apply to:
– high-voltage signs supplied at low voltage (called neon-tube);
NOTE 1 Requirements for high-voltage signs supplied at low voltage (called neon-tube) are included in
IEC 60598-2-14.
– signs and luminous-discharge-tube installations operating from a no-load rated output
voltage exceeding 1 kV but not exceeding 10 kV;
– temporary festoon lighting.
NOTE 2 Safety requirements for luminaires are covered by IEC 60598 series.
559.2 Terms and definitions
For the purposes of this clause, the general terms and definitions of IEC 60364-1, the
IEC 60598 series, IEC 60050-195, IEC 60050-826 and IEC 60570, as well as the following
apply.
559.2.1
luminaire
apparatus which distributes, filters or transforms the light transmitted from one or more lamps
and which includes, except the lamps themselves, all the parts necessary for fixing and
protecting the lamps and, where necessary, circuit auxiliaries together with the means for
connecting them to the electric supply
[IEC 60050-845:1987, 845-10-01]
559.2.2
display stands for luminaires
permanent stands in sales rooms or part of sales rooms which are used to display luminaires
NOTE The following items are not regarded as display stands:
– trade fair stands, in which luminaires remain connected for the duration of the fair;
– temporary exhibition panels with permanently connected luminaires;
– exhibition panels with a range of luminaires which can be connected with a plug-in device.
– 14 – 60364-5-55 © IEC:2011
559.3 General requirements for installations
Luminaires shall be selected and erected in accordance with the manufacturer’s instructions
and shall comply with the IEC 60598 series. An electrical supply track system for luminaires
shall comply with the requirements of IEC 60570.
NOTE 1 Refer to 512.1.5 regarding compatibility such as between lamp and control devices. During the
installation process of luminaires the following items shall at least be considered:
– starting current;
– harmonics current;
– compensation;
– leakage current;
– primer ignition current;
– voltage dip withstand.
NOTE 2 Concerning the right selection of the protection and control devices, information about the currents
relevant to all frequency generated by lamps and for all transient currents should be provided.
NOTE 3 See Annex B for an explanation of symbols used in luminaires, in controlgear for luminaires and in the
installation of the luminaires.
For the purposes of this clause, luminaires without transformer/converter and used with extra-
low-voltage (ELV) lamps connected in series shall be considered as low-voltage equipment
and not as ELV equipment. These luminaires shall be either Class I or Class II equipment.
A luminaire installed in a pelmet or other architectural or decorative building element shall be
selected and erected such that it shall not be adversely affected by the presence and/or
operation of curtains or blinds and shall not present a risk of fire or electric shock in normal
use.
559.4 Protection of the surroundings against thermal effects
In the selection and erection of luminaires the thermal effect of radiant and convection energy
on the surroundings shall be taken into account, including:
a) the maximum permissible power dissipated by the lamps;
NOTE 1 The maximum permissible power dissipated by the lamps is found on the luminaire.
b) the resistance to heat of adjacent material
– at the point of installation,
– in the thermally affected areas;
c) the minimum distance to combustible materials, including those in the path of a spotlight
beam;
d) the relevant markings on the luminaire.
NOTE 2 See Annex B for thermal effects markings and symbols.
NOTE 3 The use of glow-starters according to IEC 60155 is recommended.
Additional requirements regarding protection against thermal effects for luminaires may be
found in 422.3 and 422.4.
559.5 Wiring systems for lighting installations
559.5.1 Connection to the fixed wiring
Wiring systems shall be terminated in
– a box, which shall comply with the relevant part of IEC 60670; or
60364-5-55 © IEC:2011 – 15 –
– a device for connecting a luminaire (DCL) outlet according to IEC 61995 mounted in a box;
or
– electrical equipment designed to be connected directly to the wiring system.
559.5.2 Fixing of the luminaire
It shall be ensured that adequate means to fix the luminaire to a stable element of the
construction are provided.
The fixing means may be mechanical accessories (e. g. hooks or screws), boxes or
enclosures which are able to support luminaires (IEC 60670-21) or supporting devices for
connecting a luminaire.
The fixing means shall be capable of supporting a mass of not less than 5 kg. Where the
mass of the luminaire is greater than 5 kg, the installer shall ensure that the fixing means is
capable of supporting the mass of the luminaire.
The installation of the fixing means shall be in accordance with the manufacturer’s
instructions.
The weight of luminaires, boxes, their fixing means and the eventual accessories shall be
compatible with the mechanical capability of the supporting structure.
NOTE 1 In these conditions, a ceiling or a suspended ceiling may be considered as a stable element of the
construction and consequently luminaires may be fixed onto them.
Any cable or cord between the fixing means and the luminaire shall be installed so that any
expected stresses in the conductors, terminals and terminations will not impair the safety of
the installation.
NOTE 2 See also 522.8 of IEC 60364-5-52:20:2009.
559.5.3 Through wiring
The installation of through wiring in a luminaire is only allowed for luminaire designed for
through wiring.
Where connecting devices are required but not provided with the luminaire designed for
through wiring, the connecting devices shall be
– terminals used for the connection to the supply according to IEC 60998, or
– installation couplers used for the connection of through wiring according to IEC 61535, or
– other suitable and appropriate connecting devices.
Cables for through wiring shall be selected in accordance with the temperature information, if
provided, on the luminaire or on the manufacturer’s instruction sheet:
– for luminaires complying with IEC 60598 but with temperature marking, cables suitable for
the marked temperature shall be used;
– for luminaires complying wi
...
IEC 60364-5-55 ®
Edition 2.1 2012-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electrical installations of buildings –
Part 5-55: Selection and erection of electrical equipment – Other equipment
Installations électriques des bâtiments –
Partie 5-55: Choix et mise en oeuvre des matériels électriques – Autres matériels
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IEC 60364-5-55 ®
Edition 2.1 2012-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electrical installations of buildings –
Part 5-55: Selection and erection of electrical equipment – Other equipment
Installations électriques des bâtiments –
Partie 5-55: Choix et mise en oeuvre des matériels électriques – Autres matériels
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX CM
ICS 91.140 ISBN 978-2-8322-0426-9
– 2 – 60364-5-55 © IEC:2011+A1:2012
CONTENTS
FOREWORD . 4
550 Introduction . 6
550.1 Scope . 6
550.2 Normative references . 6
550.3 Terms and definitions . 8
551 Low-voltage generating sets . 8
551.1 Scope . 8
551.2 General requirements .9
551.3 Protective measure: extra-low-voltage provided by SELV and PELV . 10
551.4 Fault protection (protection against indirect contact) . 10
551.5 Protection against overcurrent . 11
551.6 Additional requirements for installations where the generating set provides
a supply as a switched alternative to the normal supply to the installation . 12
551.7 Additional requirements for installations where the generating set may operate
in parallel with other sources including systems for distribution of electricity
to the public . 12
551.8 Requirements for installations incorporating stationary batteries . 14
557 Auxiliary circuits . 14
557.1 Scope . 14
557.2 Terms and definitions . 14
557.3 Requirements for auxiliary circuits . 15
557.4 Characteristics of cables and conductors – Minimum cross-sectional areas . 18
557.5 Requirements for auxiliary circuits used for measurement. 19
557.6 Functional consideration . 19
557.7 Functional safety . 22
557.8 EMC . 22
559 Luminaires and lighting installations . 22
559.1 Scope . 22
559.2 Terms and definitions . 22
559.3 General requirements for installations . 23
559.4 Protection of the surroundings against thermal effects . 23
559.5 Wiring systems for lighting installations . 24
559.6 Independent lamp controlgear, e.g. ballasts . 25
559.7 Compensation capacitors . 25
559.8 Protection against electric shock for display stands for luminaires . 26
559.9 Stroboscopic effect . 26
559.10 Ground recessed luminaires . 26
Annex A (informative) List of notes concerning certain countries . 27
Annex B (informative) Explanation of symbols used in luminaires, in controlgear
for luminaires and in the installation of the luminaires . 33
60364-5-55 © IEC:2011+A1:2012 – 3 –
Bibliography . 35
Figure 557.1 – Auxiliary circuit supplied directly from the main circuit . 15
Figure 557.2 – Auxiliary circuit supplied via rectifier from the main circuit . 16
Figure 557.3 – Auxiliary circuit supplied from the main circuit via transformer . 16
Figure 557.4 – Configuration of an auxiliary circuit . 21
Table 557.1 – Minimum cross-sectional area of copper conductors in mm . 18
– 4 – 60364-5-55 © IEC:2011+A1:2012
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_______________
ELECTRICAL INSTALLATIONS OF BUILDINGS –
Part 5-55: Selection and erection of electrical equipment –
Other equipment
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
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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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) 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.
This consolidated version of IEC 60364-5-55 consists of the second edition (2011)
[documents 64/1805/FDIS and 64/1813/RVD] and its amendment 1 (2012) [documents
64/1831/FDIS and 64/1863/RVD]. It bears the edition number 2.1.
The technical content is therefore identical to the base edition and its amendment and
has been prepared for user convenience. A vertical line in the margin shows where the
base publication has been modified by amendment 1. Additions and deletions are
displayed in red, with deletions being struck through.
60364-5-55 © IEC:2011+A1:2012 – 5 –
International Standard IEC 60364-5-55 has been prepared by IEC technical committee 64:
Electrical installations and protection against electric shock.
The major technical changes with respect to the previous edition are listed below:
– additional requirements for connection of luminaires to the fixed wiring;
– modification of requirements regarding the fixing of luminaires;
– inclusion of alternative solutions for connecting devices used for through wiring and for
connection of luminaires to the supply;
– withdrawal of Clause 556, as IEC 60364-5-56 now covers this matter.
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 the base publication and its amendments 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.
IMPORTANT – The “colour inside” logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this publication using a colour printer.
– 6 – 60364-5-55 © IEC:2011+A1:2012
ELECTRICAL INSTALLATIONS OF BUILDINGS –
Part 5-55: Selection and erection of electrical equipment –
Other equipment
550 Introduction
550.1 Scope
This part of IEC 60364 covers requirements for the selection and erection of low-voltage
generating sets and for the selection and erection of luminaires and lighting installations
intended to be part of the fixed installation.
550.2 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 60038, IEC standard voltages
IEC 60050-195, International Electrotechnical Vocabulary – Part 195: Earthing and protection
against electric shock
IEC 60050-826, International Electrotechnical Vocabulary – Part 826: Electrical installations
IEC 60079 (all parts), Explosive atmospheres
IEC 60245-3, Rubber insulated cables – Rated voltages up to and including 450/750 V –
Part 3: Heat resistant silicone insulated cables
IEC 60331-11, Tests for electric cables under fire conditions – Circuit integrity – Part 11:
Apparatus – Fire alone at a flame temperature of at least 750 °C
IEC 60331-21, Tests for electric cables under fire conditions – Circuit integrity – Part 21:
Procedures and requirements – Cables of rated voltage up to and including 0,6/1,0 kV
IEC 60364-1:2005, Low-voltage electrical installations – Part 1: Fundamental principles,
assessment of general characteristics, definitions
IEC 60364-4-41:2005, Low-voltage electrical installations – Part 4-41: Protection for safety –
Protection against electric shock
IEC 60364-4-42, Low-voltage electrical installations – Part 4-42: Protection for safety –
Protection against thermal effects
IEC 60364-4-43:2008, Low-voltage electrical installations – Part 4-43: Protection for safety –
Protection against overcurrent
IEC 60364-4-44:2007, Low-voltage electrical installations – Part 4-44: Protection for safety –
Protection against voltage disturbances and electromagnetic disturbances
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
60364-5-55 © IEC:2011+A1:2012 – 7 –
IEC 60364-7-712, Electrical installations of buildings – Part 7-712: Requirements for special
installations or locations – Solar photovoltaic (PV) power supply systems
IEC 60364-7-717, Low-voltage electrical installations – Part 7-717: Requirements for special
installations or locations – Mobile or transportable units
IEC 60417 (all parts), Graphical symbols for use on equipment
IEC 60570, Electrical supply track systems for luminaires
IEC 60598 (all parts), Luminaires
IEC 60598-2-13:2006, Luminaires – Part 2-13: Particular requirements – Ground recessed
luminaires
IEC 60598-2-22:1997, Luminaires – Part 2-22: Particular requirements – Luminaires for
emergency lighting
IEC 60670 (all parts), Boxes and enclosures for electrical accessories for household and
similar fixed electrical installations
IEC 60670-21, Boxes and enclosures for electrical accessories for household and similar
fixed electrical installations – Part 21: Particular requirements for boxes and enclosures with
provision for suspension means
IEC 60702-1, Mineral insulated cables and their terminations with a rated voltage not
exceeding 750 V – Part 1: Cables
IEC 60702-2, Mineral insulated cables and their terminations with a rated voltage not
exceeding 750 V – Part 2: TÈerminations
IEC 60998 (all parts), Connecting devices for low-voltage circuits for household and similar
purposes – Part 1: General requirements
IEC 61048:2006, Auxiliaries for lamps – Capacitors for use in tubular fluorescent and other
discharge lamp circuits – General and safety requirements
IEC 61439-1:2011, Low-voltage switchgear and controlgear assemblies – Part 1: General
rules
IEC 61508 (all parts), Functional safety of electrical/electronic/programmable electronic
safety-related systems
IEC 61535, Installation couplers intended for permanent connection in fixed installations
IEC 61557-8, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500
V d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 8:
Insulation monitoring devices for IT systems
IEC 61557-9, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500
V d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 9:
Equipment for insulation fault location in IT systems
IEC 61995 (all parts), Devices for the connection of luminaires for household and similar
purposes
ISO 8528-12, Reciprocating internal combustion engine driven alternating current generating
sets – Part 12: Emergency power supply to safety services
– 8 – 60364-5-55 © IEC:2011+A1:2012
550.3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
550.3.1
self-contained battery unit
unit comprising a battery and a charging and testing unit
550.3.2
non-maintained mode
operating mode of electrical equipment, essential for safety services, operating only when the
normal supply fails
550.3.3
maintained mode
operating mode of electrical equipment, essential for safety services, operating at all times
550.3.4
safety services
those services in a building which are essential
– for the safety of persons,
– for avoiding damage to the environment or other material
NOTE Examples of safety services include
− emergency (escape) lighting,
− fire pumps,
− fire brigade lifts,
− alarm systems, such as fire alarms, smoke alarms, CO alarms and intruder alarms,
− evacuation systems,
− smoke extraction systems,
− essential medical equipment.
550.3.5
electrical safety source
source intended to maintain the supply to electrical equipment essential for the safety
services
550.3.6
electrical supply system for safety services
see IEC 60050-826
550.3.7
rated operating time of a safety source
operating time for which a safety source is designed under normal operating conditions.
551 Low-voltage generating sets
551.1 Scope
This clause provides requirements for the selection and erection of low-voltage and extra-low
voltage generating sets intended to supply, either continuously or occasionally, all or part of
the installation. Requirements are also included for installations with the following supply
arrangements:
60364-5-55 © IEC:2011+A1:2012 – 9 –
– supply to an installation which is not connected to a system for distribution of electricity to
the public;
– supply to an installation as an alternative to a system for distribution of electricity to the
public;
– supply to an installation in parallel with a system for distribution of electricity to the public
supply;
– appropriate combinations of the above.
This part does not apply to self-contained items of extra-low voltage electrical equipment
which incorporate both the source of energy and the energy-using load and for which a
specific product standard exists that includes the requirements for electrical safety.
NOTE Requirements of the electricity distributor should be ascertained before a generating set is installed in an
installation that is connected to a system for distribution of electricity to the public.
551.1.1 Generating sets with the following power sources are considered:
– combustion engines;
– turbines;
– electric motors;
– photovoltaic cells (IEC 60364-7-712 also applies);
– electrochemical accumulators;
– other suitable sources.
551.1.2 Generating sets with the following electrical characteristics are considered:
– mains-excited and separately excited synchronous generators;
– mains-excited and self-excited asynchronous generators;
– mains-commutated and self-commutated static converters with or without by-pass
facilities;
– generating sets with other suitable electrical characteristics.
551.1.3 The use of generating sets for the following purposes is considered:
– supply to permanent installations;
– supply to temporary installations;
– supply to portable equipment which is not connected to a permanent installation;
– supply to mobile units (IEC 60364-7-717 also applies).
551.2 General requirements
551.2.1 The means of excitation and commutation shall be appropriate for the intended use
of the generating set and the safety and proper functioning of other sources of supply shall
not be impaired by the generating set.
NOTE See 551.7 for particular requirements where the generating set may operate in parallel with a system for
the distribution of electricity to the public.
551.2.2 The prospective short-circuit current and prospective earth fault current shall be
assessed for each source of supply or combination of sources which can operate
independently of other sources or combinations. The short-circuit breaking capacity of
protective devices within the installation and, where appropriate, connected to a system for
distribution of electricity to the public, shall not be exceeded for any of the intended methods
of operation of the sources.
NOTE Attention should be given to the power factor specified for protective devices in the installation.
– 10 – 60364-5-55 © IEC:2011+A1:2012
551.2.3 The capacity and operating characteristics of the generating set shall be such that
danger or damage to equipment does not arise after the connection or disconnection of any
intended load as a result of the deviation of the voltage or frequency from the intended
operating range. Means shall be provided to automatically disconnect such parts of the
installation as may be necessary if the capacity of the generating set is exceeded.
NOTE 1 Attention should be given to the size of individual loads as a proportion of the capacity of the generating
set and to motor starting currents.
NOTE 2 Attention should be given to the power factor specified for protective devices in the installation.
NOTE 3 The installation of a generating set within an existing building or installation may change the conditions
of external influence for the installation (see IEC 60364-1), for example by the introduction of moving parts, parts
at high temperature or by the presence of inflammable fluids and noxious gases, etc.
551.2.4 Provision for isolation shall meet the requirements of Clause 537 for each source or
combination of sources of supply.
551.3 Protective measure: extra-low-voltage provided by SELV and PELV
551.3.1 Additional requirements for SELV and PELV where the installation
is supplied from more than one source
Where a SELV or PELV system may be supplied by more than one source, the requirements
of 414.3 of IEC 60364-4-41:2005 shall apply to each source. Where one or more of the
sources is earthed, the requirements for PELV systems in 414.4 of IEC 60364-4-41:2005 shall
apply.
If one or more of the sources does not meet the requirements of 414.3, the system shall be
treated as a FELV system and the requirements of 411.7 of IEC 60364-4-41:2005 shall apply.
551.3.2 Additional requirements where it is necessary to maintain the supply
to an extra-low voltage system
Where it is necessary to maintain the supply to an extra-low voltage system following the loss
of one or more sources of supply, each source of supply or combination of sources of supply
which can operate independently of other sources or combinations shall be capable of
supplying the intended load of the extra-low voltage system. Provisions shall be made so that
the loss of low-voltage supply to an extra-low voltage source does not lead to danger or
damage to other extra-low voltage equipment.
NOTE Such precautions may be necessary in supplies for safety services (see Clause 35 of IEC 60364-1:2005).
551.4 Fault protection (protection against indirect contact)
551.4.1 Fault protection shall be provided for the installation in respect of each source of
supply or combination of sources of supply that can operate independently of other sources or
combinations of sources.
The fault protective provisions shall be selected or precautions shall be taken to ensure that
where fault protective provisions are achieved in different ways within the same installation or
part of an installation according to the active sources of supply, no influence shall occur or
conditions arise that could impair the effectiveness of the fault protective provisions.
NOTE This might, for example, require the use of a transformer providing electrical separation between parts of
the installation using different earthing systems.
551.4.2 The generating set shall be connected so that any provision within the installation
for protection by residual current devices in accordance with IEC 60364-4-41 remains
effective for every intended combination of sources of supply.
NOTE Connection of live parts of the generator with earth may affect the protective measures.
60364-5-55 © IEC:2011+A1:2012 – 11 –
551.4.3 Protection by automatic disconnection of supply
551.4.3.1 General
Where the protective measure automatic disconnection of supply is used for protection
against electric shock, the requirements of Clause 411 of IEC 60364-4-41:2005 apply, except
as modified for the particular cases given in 551.4.3.2 or 551.4.3.3.
551.4.3.2 Additional requirements for installations where the generating set provides
a supply as a switched alternative to the normal supply to the installation
Protection by automatic disconnection of supply shall not rely upon the connection to the
earthed point of the distribution system when the generator is operating as a switched
alternative. A suitable means of earthing shall be provided.
551.4.3.3 Additional requirements for installations incorporating static converters
551.4.3.3.1 Where fault protection for parts of the installation supplied by the static
converter relies upon the automatic closure of the by-pass switch and the operation of
protective devices on the supply side of the by-pass switch is not within the time required
by Clause 411 of IEC 60364-4-41:2005, supplementary equipotential bonding shall be
provided between simultaneously accessible exposed-conductive-parts and extraneous-
conductive-parts on the load side of the static converter in accordance with 415.2 of
IEC 60364-4-41:2005.
The resistance of supplementary equipotential bonding conductors required between
simultaneously accessible conductive parts shall fulfill the following condition:
50 V
R≤
I
a
where
I is the maximum earth fault current which can be supplied by the static converter alone for
a
a period of up to 5 s.
NOTE Where such equipment is intended to operate in parallel with a system for distribution of electricity to the
public, the requirements of 551.7 also apply.
551.4.3.3.2 Precautions shall be taken or equipment shall be selected so that the correct
operation of protective devices is not impaired by d.c. currents generated by a static converter
or by the presence of filters.
551.4.3.3.3 A means of isolation shall be installed on both sides of a static converter.
This requirement does not apply on the power source side of a static converter which is
integrated in the same enclosure as the power source.
551.5 Protection against overcurrent
551.5.1 Where overcurrent protection of the generating set is required, it shall be located as
near as practicable to the generator terminals.
NOTE The contribution to the prospective short-circuit current by a generating set may be time-dependent and
may be much less than the contribution made by a system where the source is a mv/lv transformer.
– 12 – 60364-5-55 © IEC:2011+A1:2012
551.5.2 Where a generating set is intended to operate in parallel with another source of
supply, including a supply from a system for distribution of electricity to the public, or where
two or more generating sets may operate in parallel, harmonic currents shall be limited so that
the thermal rating of conductors is not exceeded.
The effects of harmonic currents may be limited as follows:
– the selection of generating sets with compensated windings;
– the provision of a suitable impedance in the connection to generator star points;
– the provision of switches which interrupt the circuit but which are interlocked so that at all
times fault protection is not impaired;
– the provision of filtering equipment;
– other suitable means.
NOTE 1 Consideration should be given to the maximum voltage which may be produced across an impedance
connected to limit harmonics.
NOTE 2 Monitoring equipment complying with IEC 61557-12 provides information on level of disturbances
resulting from the presence of harmonics.
551.6 Additional requirements for installations where the generating set provides
a supply as a switched alternative to the normal supply to the installation
551.6.1 Precautions complying with the relevant requirements of IEC 60364-5-53 for
isolation shall be taken, so that the generator cannot operate in parallel with the public supply
system for distribution of electricity to the public. Suitable precautions may include:
– an electrical, mechanical or electro-mechanical interlock between the operating
mechanisms or control circuits of the change-over switching devices;
– a system of locks with a single transferable key;
– a three-position, break-before-make, change-over switch;
– an automatic change-over switching device with a suitable interlock;
– other means providing equivalent security of operation.
NOTE Isolation should include supplies to the control circuits of the generator.
551.6.2 For TN-S systems where the neutral is not switched, any residual current device
shall be positioned to avoid incorrect operation due to the existence of any parallel neutral-
earth path.
NOTE 1 It may be desirable in TN systems to disconnect the neutral of the installation from the neutral or PEN of
the system for distribution of electricity to the public to avoid disturbances such as induced voltage surges caused
by lightning.
NOTE 2 See also 444.4.7 of IEC 60364-4-44:2007.
551.7 Additional requirements for installations where the generating set may
operate in parallel with other sources including systems for distribution of
electricity to the public
551.7.1 Where a generating set is used as an additional source of supply in parallel with
another source, protection against thermal effects in accordance with IEC 60364-4-42 and
protection against overcurrent in accordance with IEC 60364-4-43 shall remain effective in all
situations.
Except where an uninterruptible power supply is provided to supply specific items of current
using equipment within the final circuit to which it is connected, such a generating set shall be
installed on the supply side of all the protective devices for the final circuits of the installation.
60364-5-55 © IEC:2011+A1:2012 – 13 –
551.7.2 A generating set used as an additional source of supply in parallel with another
source shall be installed:
– on the supply side of all the protective devices for the final circuits of the installation, or
– on the load side of all the protective devices for a final circuit of the installation, but in this
case all the following additional requirement shall be fulfilled:
a) the conductors of the final circuit shall meet the following requirement:
I ≥ I + I
z n g
where
I is the current-carrying capacity of the final circuit conductors;
z
I is the rated current of the protective device of the final circuit;
n
is the rated output current of the generating set; and
I
g
b) a generating set shall not be connected to a final circuit by means of a plug and
socket; and
c) a residual current device providing protection of the final circuit in accordance with
Clause 411 or Clause 415 of IEC 60364-4-41:2005 shall disconnect all live conductors
including the neutral conductor; and
d) the line and neutral conductors of the final circuit and of the generating set shall not
be connected to earth downstream of the protective device of the final circuit.
NOTE Where the generating set is installed in a final circuit on the load side of all the protective devices for that
final circuit, except where the protective devices for the final circuit disconnect the line and the neutral conductors,
the disconnection time in accordance with 411.3.2 of IEC 60364-4-41:2005 is the combination of the disconnection
time of the protective device for the final circuit and the time taken for the output voltage of the generating set to
be reduced to less than 50 V.
551.7.3 In selecting and using a generating set to run in parallel with another source,
including the system for distribution of electricity to the public, care shall be taken to avoid
adverse effects to that system and to other installations in respect of power factor, voltage
changes, harmonic distortion, d.c. current injection, unbalance, starting, synchronizing or
voltage fluctuation effects. In the case of a system for distribution of electricity to the public,
the distributor shall be consulted in respect of particular requirements. Where synchronization
is necessary, the use of automatic synchronizing systems which consider frequency, phase
and voltage is to be preferred.
551.7.4 Where a generating set is intended to run in parallel with the system for distribution
of electricity to the public, means of automatic switching shall be provided to disconnect the
generating set from the system for distribution of electricity to the public in the event of loss of
that supply or deviation of the voltage or frequency at the supply terminals from values
declared for normal supply.
The type of protection and the sensitivity and operating times depend upon the protection of
the system for distribution of electricity to the public and the number of generating sets
connected and shall be agreed by the distributor.
In case of presence of static converters, the means of switching shall be provided on the load
side of this static converter.
551.7.5 Where a generating set is intended to run in parallel with the system for distribution
of electricity to the public, means shall be provided to prevent the connection of a generating
set to the system for distribution of electricity to the public in the event of loss of that supply
or deviation of the voltage or frequency at the supply terminals from values declared for
normal supply.
– 14 – 60364-5-55 © IEC:2011+A1:2012
551.7.6 Where a generating set is intended to run in parallel with the system for distribution
of electricity to the public, means shall be provided to enable the generating set to be isolated
from the system for distribution of electricity to the public. The accessibility of this means of
isolation shall comply with national rules and distribution system operator requirements.
551.7.7 Where a generating set may also operate as switched alternative to the distribution
system, the installation shall also comply with 551.6.
551.8 Requirements for installations incorporating stationary batteries
551.8.1 Stationary batteries shall be installed so that they are accessible only to skilled or
instructed persons.
NOTE This generally requires the battery to be installed in a secure location, or, for smaller batteries, a secure
enclosure.
The location or enclosure shall be adequately ventilated.
551.8.2 Battery connections shall have basic protection by insulation or enclosures or shall
be arranged so that two bare conductive parts having between them a potential difference
exceeding 120 V cannot be inadvertently touched simultaneously.
557 Auxiliary circuits
557.1 Scope
This clause applies to auxiliary circuits, except those covered by specific product or system
standards.
557.2 Terms and definitions
For the purposes of this document, the following definitions apply.
NOTE For general definitions, see IEC 60050-826.
557.2.1
auxiliary circuit
circuit for transmission of signals intended for control, detection, supervision or measurement
of the functional status of a main circuit
557.2.2
main circuit
circuit containing electrical equipment for generation, conversion, distribution or switching of
electrical power or current-using equipment
557.2.3
current-limiting signal output
signal output provided by a device which serves to limit the current
557.2.4
inherently short-circuit and earth fault proof
state of an electric equipment or assembly protected against short-circuits and earth faults by
suitable design and erection provisions
[SOURCE: IEC 60050-826:2004, definition 826-14-15]
60364-5-55 © IEC:2011+A1:2012 – 15 –
557.2.5
safety integrity level
SIL
discrete level for specifying the safety integrity requirements of the safety functions to be
allocated to the electrical/electronic/programmable electronic safety-related systems, where
safety integrity level 4 has the highest level of safety integrity and safety integrity level 1 has
the lowest
[SOURCE: IEC 61508-4:2010, 3.5.8, modified]
557.3 Requirements for auxiliary circuits
557.3.1 General
The power supply a.c. or d.c. for an auxiliary circuit may be either dependent or independent
of the main circuit according to its required function. If the status of the main circuit has to be
signaled, then the signaling circuit shall be able to operate independently of that main circuit.
NOTE In extensive installations the use of a d.c. auxiliary supply may be preferred.
557.3.2 Power supply for auxiliary circuits dependent on the main circuit
557.3.2.1 General
Auxiliary circuits with a power supply dependent on the main a.c. circuit shall be connected to
the main circuit:
– directly (see Figure 557.1); or
– via a rectifier (see Figure 557.2); or
– via transformer (see Figure 557.3).
It is recommended that auxiliary circuits supplying primarily electronic equipment or systems
should not be supplied directly but at least via simple separation from the main circuit.
L1
L2
L3
N
Terminals for the
auxiliary circuit
IEC 1802/12
Figure 557.1 – Auxiliary circuit supplied directly from the main circuit
– 16 – 60364-5-55 © IEC:2011+A1:2012
L1
L2
L3
N
Terminals for the
auxiliary circuit
+ –
IEC 1803/12
Figure 557.2 – Auxiliary circuit supplied via rectifier from the main circuit
L1
L2
L3
N
Terminals for the
auxiliary circuit
IEC 1804/12
Figure 557.3 – Auxiliary circuit supplied from the main circuit via transformer
NOTE In the case of an auxiliary circuit supplied from the main circuit, directly or via the rectifier, the auxiliary
circuit begins at the connection point to the main circuit, see Figure 557.1. When via the rectifier, see Figure 557.2,
or by a transformer supply, see Figure 557.3, the auxiliary circuit begins on the d.c. side of the rectifier or on the
secondary side of the transformer.
557.3.2.2 Auxiliary circuit supplied from the main circuit
...
IEC 60364-5-55 ®
Edition 2.2 2016-07
CONSOLIDATED VERSION
INTERNATIONAL
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IEC 60364-5-55 ®
Edition 2.2 2016-07
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electrical installations of buildings –
Part 5-55: Selection and erection of electrical equipment – Other equipment
Installations électriques des bâtiments –
Partie 5-55: Choix et mise en oeuvre des matériels électriques – Autres matériels
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 91.140 ISBN 978-2-8322-3578-2
IEC 60364-5-55 ®
Edition 2.2 2016-07
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Electrical installations of buildings –
Part 5-55: Selection and erection of electrical equipment – Other equipment
Installations électriques des bâtiments –
Partie 5-55: Choix et mise en oeuvre des matériels électriques – Autres matériels
– 2 – IEC 60364-5-55:2011+AMD1:2012
+AMD2:2016 CSV © IEC 2016
CONTENTS
FOREWORD. 4
550 Introduction . 6
550.1 Scope . 6
550.2 Normative references . 6
550.3 Terms and definitions . 8
551 Low-voltage generating sets . 8
551.1 Scope . 8
551.2 General requirements . 9
551.3 Protective measure: extra-low-voltage provided by SELV and PELV . 10
551.4 Fault protection (protection against indirect contact) . 10
551.5 Protection against overcurrent . 11
551.6 Additional requirements for installations where the generating set provides
a supply as a switched alternative to the normal supply to the installation . 12
551.7 Additional requirements for installations where the generating set may .
operate in parallel with other sources including systems for distribution of
electricity to the public . 12
551.8 Requirements for installations incorporating stationary batteries . 14
557 Auxiliary circuits . 14
557.1 Scope . 14
557.2 Terms and definitions . 14
557.3 Requirements for auxiliary circuits . 15
557.4 Characteristics of cables and conductors – Minimum cross-sectional areas . 18
557.5 Requirements for auxiliary circuits used for measurement . 19
557.6 Functional consideration . 20
557.7 Functional safety . 22
557.8 EMC . 22
559 Luminaires and lighting installations . 22
559.1 Scope . 22
559.2 Terms and definitions . 22
559.3 General requirements for installations . 23
559.4 Protection of the surroundings against thermal effects . 23
559.5 Wiring systems for lighting installations . 24
559.6 Independent lamp controlgear, e.g. ballasts . 25
559.7 Compensation capacitors . 26
559.8 Protection against electric shock for display stands for luminaires . 26
559.9 Stroboscopic effect . 26
559.10 Ground recessed luminaires . 26
Annex A (informative) List of notes concerning certain countries . 27
Annex B (informative) Explanation of symbols used in luminaires, in controlgear for
luminaires and in the installation of the luminaires . 33
Bibliography . 35
Figure 557.1 – Auxiliary circuit supplied directly from the main circuit . 15
Figure 557.2 – Auxiliary circuit supplied via rectifier from the main circuit . 16
Figure 557.3 – Auxiliary circuit supplied from the main circuit via transformer . 16
Figure 557.4 – Configuration of an auxiliary circuit . 21
+AMD2:2016 CSV © IEC 2016
Table 557.1 – Minimum cross-sectional area of copper conductors in mm . 19
– 4 – IEC 60364-5-55:2011+AMD1:2012
+AMD2:2016 CSV © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_______________
ELECTRICAL INSTALLATIONS OF BUILDINGS –
Part 5-55: Selection and erection of electrical equipment –
Other equipment
FOREWORD
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This consolidated version of the official IEC Standard and its amendments has been prepared
for user convenience.
IEC 60364-5-55 edition 2.2 contains the second edition (2011-12) [documents 64/1805/FDIS and
64/1813/RVD], its amendment 1 (2012-10) [documents 64/1831/FDIS and 64/1863/RVD] and its
amendment 2 (2016-07) [documents 64/2085/CDV and 64/2126/RVC].
In this Redline version, a vertical line in the margin shows where the technical content is
modified by amendments 1 and 2. Additions are in green text, deletions are in strikethrough
red text. A separate Final version with all changes accepted is available in this publication.
+AMD2:2016 CSV © IEC 2016
International Standard IEC 60364-5-55 has been prepared by IEC technical committee 64:
Electrical installations and protection against electric shock.
The major technical changes with respect to the previous edition are listed below:
– additional requirements for connection of luminaires to the fixed wiring;
– modification of requirements regarding the fixing of luminaires;
– inclusion of alternative solutions for connecting devices used for through wiring and for
connection of luminaires to the supply;
– withdrawal of Clause 556, as IEC 60364-5-56 now covers this matter.
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 the base publication and its amendments 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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 6 – IEC 60364-5-55:2011+AMD1:2012
+AMD2:2016 CSV © IEC 2016
ELECTRICAL INSTALLATIONS OF BUILDINGS –
Part 5-55: Selection and erection of electrical equipment –
Other equipment
550 Introduction
550.1 Scope
This part of IEC 60364 covers specifies requirements and recommendations for the selection
and erection of low-voltage generating sets and for the selection and erection of luminaires
and lighting installations electric equipment not covered by other parts of IEC 60364-5,
intended to be part of the fixed installation.
550.2 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 60038, IEC standard voltages
IEC 60050-195, International Electrotechnical Vocabulary – Part 195: Earthing and protection
against electric shock
IEC 60050-826, International Electrotechnical Vocabulary – Part 826: Electrical installations
IEC 60079 (all parts), Explosive atmospheres
IEC 60245-3, Rubber insulated cables – Rated voltages up to and including 450/750 V –
Part 3: Heat resistant silicone insulated cables
IEC 60331-11, Tests for electric cables under fire conditions – Circuit integrity – Part 11:
Apparatus – Fire alone at a flame temperature of at least 750 °C
IEC 60331-21, Tests for electric cables under fire conditions – Circuit integrity – Part 21:
Procedures and requirements – Cables of rated voltage up to and including 0,6/1,0 kV
IEC 60364-1:2005, Low-voltage electrical installations – Part 1: Fundamental principles,
assessment of general characteristics, definitions
IEC 60364-4-41:2005, Low-voltage electrical installations – Part 4-41: Protection for safety –
Protection against electric shock
IEC 60364-4-42, Low-voltage electrical installations – Part 4-42: Protection for safety –
Protection against thermal effects
IEC 60364-4-43:2008, Low-voltage electrical installations – Part 4-43: Protection for safety –
Protection against overcurrent
IEC 60364-4-44:2007, Low-voltage electrical installations – Part 4-44: Protection for safety –
Protection against voltage disturbances and electromagnetic disturbances
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
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IEC 60364-7-712, Electrical installations of buildings – Part 7-712: Requirements for special
installations or locations – Solar photovoltaic (PV) power supply systems
IEC 60364-7-717, Low-voltage electrical installations – Part 7-717: Requirements for special
installations or locations – Mobile or transportable units
IEC 60417 (all parts), Graphical symbols for use on equipment
IEC 60570, Electrical supply track systems for luminaires
IEC 60598 (all parts), Luminaires
IEC 60598-2-13:2006, Luminaires – Part 2-13: Particular requirements – Ground recessed
luminaires
IEC 60598-2-22:1997, Luminaires – Part 2-22: Particular requirements – Luminaires for
emergency lighting
IEC 60670 (all parts), Boxes and enclosures for electrical accessories for household and
similar fixed electrical installations
IEC 60670-21, Boxes and enclosures for electrical accessories for household and similar
fixed electrical installations – Part 21: Particular requirements for boxes and enclosures with
provision for suspension means
IEC 60702-1, Mineral insulated cables and their terminations with a rated voltage not
exceeding 750 V – Part 1: Cables
IEC 60702-2, Mineral insulated cables and their terminations with a rated voltage not
exceeding 750 V – Part 2: TÈerminations
IEC 60998 (all parts), Connecting devices for low-voltage circuits for household and similar
purposes – Part 1: General requirements
IEC 61048:2006, Auxiliaries for lamps – Capacitors for use in tubular fluorescent and other
discharge lamp circuits – General and safety requirements
IEC 61439-1:2011, Low-voltage switchgear and controlgear assemblies – Part 1: General
rules
IEC 61508 (all parts), Functional safety of electrical/electronic/programmable electronic
safety-related systems
IEC 61535, Installation couplers intended for permanent connection in fixed installations
IEC 61557-8, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500
V d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 8:
Insulation monitoring devices for IT systems
IEC 61557-9, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500
V d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 9:
Equipment for insulation fault location in IT systems
IEC 61995 (all parts), Devices for the connection of luminaires for household and similar
purposes
ISO 8528-12, Reciprocating internal combustion engine driven alternating current generating
sets – Part 12: Emergency power supply to safety services
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550.3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
550.3.1
self-contained battery unit
unit comprising a battery and a charging and testing unit
550.3.2
non-maintained mode
operating mode of electrical equipment, essential for safety services, operating only when the
normal supply fails
550.3.3
maintained mode
operating mode of electrical equipment, essential for safety services, operating at all times
550.3.4
safety services
those services in a building which are essential
– for the safety of persons,
– for avoiding damage to the environment or other material
NOTE Examples of safety services include
− emergency (escape) lighting,
− fire pumps,
− fire brigade lifts,
− alarm systems, such as fire alarms, smoke alarms, CO alarms and intruder alarms,
− evacuation systems,
− smoke extraction systems,
− essential medical equipment.
550.3.5
electrical safety source
source intended to maintain the supply to electrical equipment essential for the safety
services
550.3.6
electrical supply system for safety services
see IEC 60050-826
550.3.7
rated operating time of a safety source
operating time for which a safety source is designed under normal operating conditions.
551 Low-voltage generating sets
551.1 Scope
This clause provides requirements for the selection and erection of low-voltage and extra-low
voltage generating sets intended to supply, either continuously or occasionally, all or part of
the installation. Requirements are also included for installations with the following supply
arrangements:
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– supply to an installation which is not connected to a system for distribution of electricity to
the public;
– supply to an installation as an alternative to a system for distribution of electricity to the
public;
– supply to an installation in parallel with a system for distribution of electricity to the public
supply;
– appropriate combinations of the above.
This part does not apply to self-contained items of extra-low voltage electrical equipment
which incorporate both the source of energy and the energy-using load and for which a
specific product standard exists that includes the requirements for electrical safety.
NOTE Requirements of the electricity distributor should be ascertained before a generating set is installed in an
installation that is connected to a system for distribution of electricity to the public.
551.1.1 Generating sets with the following power sources are considered:
– combustion engines;
– turbines;
– electric motors;
– photovoltaic cells (IEC 60364-7-712 also applies);
– electrochemical accumulators;
– other suitable sources.
551.1.2 Generating sets with the following electrical characteristics are considered:
– mains-excited and separately excited synchronous generators;
– mains-excited and self-excited asynchronous generators;
– mains-commutated and self-commutated static converters with or without by-pass
facilities;
– generating sets with other suitable electrical characteristics.
551.1.3 The use of generating sets for the following purposes is considered:
– supply to permanent installations;
– supply to temporary installations;
– supply to portable equipment which is not connected to a permanent installation;
– supply to mobile units (IEC 60364-7-717 also applies).
551.2 General requirements
551.2.1 The means of excitation and commutation shall be appropriate for the intended use
of the generating set and the safety and proper functioning of other sources of supply shall
not be impaired by the generating set.
NOTE See 551.7 for particular requirements where the generating set may operate in parallel with a system for
the distribution of electricity to the public.
551.2.2 The prospective short-circuit current and prospective earth fault current shall be
assessed for each source of supply or combination of sources which can operate
independently of other sources or combinations. The short-circuit breaking capacity of
protective devices within the installation and, where appropriate, connected to a system for
distribution of electricity to the public, shall not be exceeded for any of the intended methods
of operation of the sources.
NOTE Attention should be given to the power factor specified for protective devices in the installation.
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551.2.3 The capacity and operating characteristics of the generating set shall be such that
danger or damage to equipment does not arise after the connection or disconnection of any
intended load as a result of the deviation of the voltage or frequency from the intended
operating range. Means shall be provided to automatically disconnect such parts of the
installation as may be necessary if the capacity of the generating set is exceeded.
NOTE 1 Attention should be given to the size of individual loads as a proportion of the capacity of the generating
set and to motor starting currents.
NOTE 2 Attention should be given to the power factor specified for protective devices in the installation.
NOTE 3 The installation of a generating set within an existing building or installation may change the conditions
of external influence for the installation (see IEC 60364-1), for example by the introduction of moving parts, parts
at high temperature or by the presence of inflammable fluids and noxious gases, etc.
551.2.4 Provision for isolation shall meet the requirements of Clause 537 for each source or
combination of sources of supply.
551.3 Protective measure: extra-low-voltage provided by SELV and PELV
551.3.1 Additional requirements for SELV and PELV where the installation
is supplied from more than one source
Where a SELV or PELV system may be supplied by more than one source, the requirements
of 414.3 of IEC 60364-4-41:2005 shall apply to each source. Where one or more of the
sources is earthed, the requirements for PELV systems in 414.4 of IEC 60364-4-41:2005 shall
apply.
If one or more of the sources does not meet the requirements of 414.3, the system shall be
treated as a FELV system and the requirements of 411.7 of IEC 60364-4-41:2005 shall apply.
551.3.2 Additional requirements where it is necessary to maintain the supply
to an extra-low voltage system
Where it is necessary to maintain the supply to an extra-low voltage system following the loss
of one or more sources of supply, each source of supply or combination of sources of supply
which can operate independently of other sources or combinations shall be capable of
supplying the intended load of the extra-low voltage system. Provisions shall be made so that
the loss of low-voltage supply to an extra-low voltage source does not lead to danger or
damage to other extra-low voltage equipment.
NOTE Such precautions may be necessary in supplies for safety services (see Clause 35 of IEC 60364-1:2005).
551.4 Fault protection (protection against indirect contact)
551.4.1 Fault protection shall be provided for the installation in respect of each source of
supply or combination of sources of supply that can operate independently of other sources or
combinations of sources.
The fault protective provisions shall be selected or precautions shall be taken to ensure that
where fault protective provisions are achieved in different ways within the same installation or
part of an installation according to the active sources of supply, no influence shall occur or
conditions arise that could impair the effectiveness of the fault protective provisions.
NOTE This might, for example, require the use of a transformer providing electrical separation between parts of
the installation using different earthing systems.
551.4.2 The generating set shall be connected so that any provision within the installation
for protection by residual current devices in accordance with IEC 60364-4-41 remains
effective for every intended combination of sources of supply.
NOTE Connection of live parts of the generator with earth may affect the protective measures.
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551.4.3 Protection by automatic disconnection of supply
551.4.3.1 General
Where the protective measure automatic disconnection of supply is used for protection
against electric shock, the requirements of Clause 411 of IEC 60364-4-41:2005 apply, except
as modified for the particular cases given in 551.4.3.2 or 551.4.3.3.
551.4.3.2 Additional requirements for installations where the generating set provides
a supply as a switched alternative to the normal supply to the installation
Protection by automatic disconnection of supply shall not rely upon the connection to the
earthed point of the distribution system when the generator is operating as a switched
alternative. A suitable means of earthing shall be provided.
551.4.3.3 Additional requirements for installations incorporating static converters
551.4.3.3.1 Where fault protection for parts of the installation supplied by the static
converter relies upon the automatic closure of the by-pass switch and the operation of
protective devices on the supply side of the by-pass switch is not within the time required
by Clause 411 of IEC 60364-4-41:2005, supplementary equipotential bonding shall be
provided between simultaneously accessible exposed-conductive-parts and extraneous-
conductive-parts on the load side of the static converter in accordance with 415.2 of
IEC 60364-4-41:2005.
The resistance of supplementary equipotential bonding conductors required between
simultaneously accessible conductive parts shall fulfill the following condition:
50 V
R≤
I
a
where
I is the maximum earth fault current which can be supplied by the static converter alone for
a
a period of up to 5 s.
NOTE Where such equipment is intended to operate in parallel with a system for distribution of electricity to the
public, the requirements of 551.7 also apply.
551.4.3.3.2 Precautions shall be taken or equipment shall be selected so that the correct
operation of protective devices is not impaired by d.c. currents generated by a static converter
or by the presence of filters.
551.4.3.3.3 A means of isolation shall be installed on both sides of a static converter.
This requirement does not apply on the power source side of a static converter which is
integrated in the same enclosure as the power source.
551.5 Protection against overcurrent
551.5.1 Where overcurrent protection of the generating set is required, it shall be located as
near as practicable to the generator terminals.
NOTE The contribution to the prospective short-circuit current by a generating set may be time-dependent and
may be much less than the contribution made by a system where the source is a mv/lv transformer.
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551.5.2 Where a generating set is intended to operate in parallel with another source of
supply, including a supply from a system for distribution of electricity to the public, or where
two or more generating sets may operate in parallel, harmonic currents shall be limited so that
the thermal rating of conductors is not exceeded.
The effects of harmonic currents may be limited as follows:
– the selection of generating sets with compensated windings;
– the provision of a suitable impedance in the connection to generator star points;
– the provision of switches which interrupt the circuit but which are interlocked so that at all
times fault protection is not impaired;
– the provision of filtering equipment;
– other suitable means.
NOTE 1 Consideration should be given to the maximum voltage which may be produced across an impedance
connected to limit harmonics.
NOTE 2 Monitoring equipment complying with IEC 61557-12 provides information on level of disturbances
resulting from the presence of harmonics.
551.6 Additional requirements for installations where the generating set provides
a supply as a switched alternative to the normal supply to the installation
551.6.1 Precautions complying with the relevant requirements of IEC 60364-5-53 for
isolation shall be taken, so that the generator cannot operate in parallel with the public supply
system for distribution of electricity to the public. Suitable precautions may include:
– an electrical, mechanical or electro-mechanical interlock between the operating
mechanisms or control circuits of the change-over switching devices;
– a system of locks with a single transferable key;
– a three-position, break-before-make, change-over switch;
– an automatic change-over switching device with a suitable interlock;
– other means providing equivalent security of operation.
NOTE Isolation should include supplies to the control circuits of the generator.
551.6.2 For TN-S systems where the neutral is not switched, any residual current device
shall be positioned to avoid incorrect operation due to the existence of any parallel neutral-
earth path.
NOTE 1 It may be desirable in TN systems to disconnect the neutral of the installation from the neutral or PEN of
the system for distribution of electricity to the public to avoid disturbances such as induced voltage surges caused
by lightning.
NOTE 2 See also 444.4.7 of IEC 60364-4-44:2007.
551.7 Additional requirements for installations where the generating set may
operate in parallel with other sources including systems for distribution of
electricity to the public
551.7.1 Where a generating set is used as an additional source of supply in parallel with
another source, protection against thermal effects in accordance with IEC 60364-4-42 and
protection against overcurrent in accordance with IEC 60364-4-43 shall remain effective in all
situations.
Except where an uninterruptible power supply is provided to supply specific items of current
using equipment within the final circuit to which it is connected, such a generating set shall be
installed on the supply side of all the protective devices for the final circuits of the installation.
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551.7.2 A generating set used as an additional source of supply in parallel with another
source shall be installed:
– on the supply side of all the protective devices for the final circuits of the installation, or
– on the load side of all the protective devices for a final circuit of the installation, but in this
case all the following additional requirement shall be fulfilled:
a) the conductors of the final circuit shall meet the following requirement:
I ≥ I + I
z n g
where
I is the current-carrying capacity of the final circuit conductors;
z
I is the rated current of the protective device of the final circuit;
n
I is the rated output current of the generating set; and
g
b) a generating set shall not be connected to a final circuit by means of a plug and
socket; and
c) a residual current device providing protection of the final circuit in accordance with
Clause 411 or Clause 415 of IEC 60364-4-41:2005 shall disconnect all live conductors
including the neutral conductor; and
d) the line and neutral conductors of the final circuit and of the generating set shall not
be connected to earth downstream of the protective device of the final circuit.
NOTE Where the generating set is installed in a final circuit on the load side of all the protective devices for that
final circuit, except where the protective devices for the final circuit disconnect the line and the neutral conductors,
the disconnection time in accordance with 411.3.2 of IEC 60364-4-41:2005 is the combination of the disconnection
time of the protective device for the final circuit and the time taken for the output voltage of the generating set to
be reduced to less than 50 V.
551.7.3 In selecting and using a generating set to run in parallel with another source,
including the system for distribution of electricity to the public, care shall be taken to avoid
adverse effects to that system and to other installations in respect of power factor, voltage
changes, harmonic distortion, d.c. current injection, unbalance, starting, synchronizing or
voltage fluctuation effects. In the case of a system for distribution of electricity to the public,
the distributor shall be consulted in respect of particular requirements. Where synchronization
is necessary, the use of automatic synchronizing systems which consider frequency, phase
and voltage is to be preferred.
551.7.4 Where a generating set is intended to run in parallel with the system for distribution
of electricity to the public, means of automatic switching shall be provided to disconnect the
generating set from the system for distribution of electricity to the public in the event of loss of
that supply or deviation of the voltage or frequency at the supply terminals from values
declared for normal supply.
The type of protection and the sensitivity and operating times depend upon the protection of
the system for distribution of electricity to the public and the number of generating sets
connected and shall be agreed by the distributor.
In case of presence of static converters, the means of switching shall be provided on the load
side of this static converter.
551.7.5 Where a generating set is intended to run in parallel with the system for distribution
of electricity to the public, means shall be provided to prevent the connection of a generating
set to the system for distribution of electricity to the public in the event of loss of that supply
or deviation of the voltage or frequency at the supply terminals from values declared for
normal supply.
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551.7.6 Where a generating set is intended to run in parallel with the system for distribution
of electricity to the public, means shall be provided to enable the generating set to be isolated
from the system for distribution of electricity to the public. The accessibility of this means of
isolation shall comply with national rules and distribution system operator requirements.
551.7.7 Where a generating set may also operate as switched alternative to the distribution
system, the installation shall also comply with 551.6.
551.8 Requirements for installations incorporating stationary batteries
551.8.1 Stationary batteries shall be installed so that they are accessible only to skilled or
instructed persons.
NOTE This generally requires the battery to be installed in a secure location, or, for smaller batteries, a secure
enclosure.
The location or enclosure shall be adequately ventilated.
551.8.2 Battery connections shall have basic protection by insulation or enclosures or shall
be arranged so that two bare conductive parts having between them a potential difference
exceeding 120 V cannot be inadvertently touched simultaneously.
557 Auxiliary circuits
557.1 Scope
This clause applies to auxiliary circuits, except those covered by specific product or system
standards.
557.2 Terms and definitions
For the purposes of this document, the following definitions apply.
NOTE For general definitions, see IEC 60050-826.
557.2.1
auxiliary circuit
circuit for transmission of signals intended for control, detection, supervision or measurement
of the functional status of a main circuit
557.2.2
main circuit
circuit containing electrical equipment for generation, conversion, distribution or switching of
electrical power or current-using equipment
557.2.3
current-limiting signal output
signal output provided by a device which serves to limit the current
557.2.4
inherently short-circuit and earth fault proof
state of an electric equipment or assembly protected against short-circuits and earth faults by
suitable design and erection provisions
[SOURCE: IEC 60050-826:2004, definition 826-14-15]
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557.2.5
safety integrity level
SIL
discrete level for specifying the safety integrity requirements of the safety functions to be
allocated to the electrical/electronic/programmable electronic safety-related systems, where
safety integrity level 4 has the highest level of safety integrity and safety integrity level 1 has
the lowest
[SOURCE: IEC 61508-4:2010, 3.5.8, modified]
557.3 Requirements for auxilia
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