IEC 60364-5-56:2009

Low-voltage electrical installations - Part 5-56: Selection and erection of electrical equipment - Safety services

IEC 60364-5-56:2009 covers general requirements for safety services, selection and erection of electrical supply systems for safety services and electrical safety sources. Standby electrical supply systems are outside the scope of this part. This part does not apply to installations in hazardous areas (BE3), for which requirements are given in IEC 60079-14. This second edition of IEC 60364-5-56 comes about as a result of changes to Clause 556, Safety services, of IEC 60364-5-55 (2001), as modified by its amendment 1 (2001). It replaces Clause 556 of IEC 60364-5-55:2001. Clause 556 is to be withdrawn at the time of publication of this new Part 56. The main changes with regard to the previous edition are listed below:
1) Many more definitions are included, e.g. response time, central power supply system, low power supply system, preferential circuit and escape route.
2) Automatic supplies are now classified according to the maximum changeover times, for example a supply classified as short break means an automatic supply is available within 0,5 s.
3) Safety sources that can operate in parallel are specifically recognized in 560.6.9.
4) Requirements are now given for batteries used for safety sources for central and low power supply sources.
5) Drawings are now required, such as a single-line diagram, drawings showing the location of equipment and a list of equipment permanently connected to the safety power supply.
6) Operating instructions are now required.
7) Detailed requirements are now given for emergency escape lighting applications, direct current circuits and fire protection applications.
8) Additional requirements for initial verification and periodic inspection and testing are now included in the standard.
9) Two annexes are now included (Annex A and Annex B) giving guidance for emergency lighting and guidance for fire protection equipment, respectively.

Installations électriques des bâtiments - Partie 5-56: Choix et mise en oeuvre des matériels électriques - Services de sécurité

La CEI 60364-5-56:2009 traite des exigences générales relatives aux services de sécurité, au choix et à la mise en oeuvre des alimentations électriques des installations et des sources de sécurité. Les alimentations électriques de remplacement ne sont pas traitées dans la présente partie. Cette partie ne s'applique pas aux installations dans les zones à risque d'explosion (BE3) pour lesquelles des exigences sont données dans la CEI 60079-14. Cette deuxième édition de la CEI 60364-5-56 est issue de la révision de l'Article 556, Installations de sécurité, de la CEI 60364-5-55 (2001), telle que modifiée par son amendement 1 (2001). Elle remplace l'Article 556 de la CEI 60364-5-55 :2001. L'Article 556 est à supprimer à la date de la publication de cette nouvelle Partie 56. Les principales modifications par rapport à l'édition précédente sont les suivantes:
1) Plus de définitions incluses, par exemple, temps de réponse, source centrale d'alimentation, source d'alimentation de faible puissance, circuit préférentiel et chemin d'évacuation.
2) Les alimentations automatiques sont maintenant classées selon le temps de commutation, par exemple, une alimentation classée arrêt court signifie que l'alimentation automatique reprend en 0,5 s.
3) Les sources de sécurité pouvant fonctionner en parallèle sont spécifiquement indiquées en 560.6.9.
4) Les exigences pour les batteries employées comme sources centrales de sécurité ou de faibles puissances sont maintenant indiquées.
5) Des schémas sont maintenant requis, tel qu'un schéma unifilaire, d'implantation des matériels et une liste des matériels connecté en permanence à la source de sécurité.
6) Un mode d'emploi est maintenant requis.
7) Des exigences détaillées sont maintenant données pour l'éclairage d'évacuation, les circuits en courant continu et la protection incendie.
8) Des exigences complémentaires pour les vérifications initiales et périodiques ainsi que les essais sont incluses dans la norme.
9) Deux annexes ont été ajoutées (l'Annexe A et l'Annexe B) afin de donner les lignes directrices pour l'éclairage de sécurité et les matériels de protection incendie.

General Information

• Status: Published
• Publication Date: 29-Jul-2009
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: TC 64 - Electrical installations and protection against electric shock
• Drafting Committee: MT 34 - TC 64/MT 34
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 02-Nov-2018

Relations

• Revised: IEC 60364-5-56:2018 - Low-voltage electrical installations - Part 5-56: Selection and erection of electrical equipment - Safety services
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60364-5-56


®

Edition 2.0 2009-07



INTERNATIONAL



STANDARD



NORME
INTERNATIONALE


Low-voltage electrical installations –
Part 5-56: Selection and erection of electrical equipment – Safety services

Installations électriques des bâtiments –
Partie 5-56: Choix et mise en œuvre des matériels électriques – Services de
sécurité


IEC 60364-5-56:2009

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IEC 60364-5-56


®

Edition 2.0 2009-07



INTERNATIONAL



STANDARD



NORME
INTERNATIONALE


Low-voltage electrical installations –
Part 5-56: Selection and erection of electrical equipment – Safety services

Installations électriques des bâtiments –
Partie 5-56: Choix et mise en œuvre des matériels électriques – Services de
sécurité


INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
R
CODE PRIX
ICS 91.140 ISBN 978-2-88910-177-1
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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CONTENTS

FOREWORD.3


560.1 Scope.5

560.2 Normative references.5

560.3 Terms and definitions.6


560.4 Classification.7

560.5 General.8

560.6 Electrical sources for safety services .8

560.7 Circuits of safety services .10
560.8 Wiring systems.11
560.9 Emergency escape lighting applications.11
560.10 Fire protection applications .13
Annex A (informative) Guidance for emergency lighting .14
Annex B (informative) Guidance for fire protection equipment.15
Annex C (informative) List of notes concerning certain countries .16
Bibliography.19

Table A.1 – Guidance for emergency lighting.14
Table B.1 – Guidance for safety equipment.15

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INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________



LOW-VOLTAGE ELECTRICAL INSTALLATIONS –



Part 5-56: Selection and erection of electrical equipment –

Safety services





FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60364-5-56 has been prepared by IEC technical committee 64:
Electrical installations and protection against electric shock.
This second edition of IEC 60364-5-56 comes about as a result of changes to Clause 556,
1
Safety services, of IEC 60364-5-55 (2001), as modified by its amendment 1 (2001).
This new part replaces Clause 556 of IEC 60364-5-55:2001. Clause 556 is to be withdrawn at
the time of publication of this new Part 56.
The main changes with regard to the previous edition are listed below:
1) Many more definitions are included, e.g. response time, central power supply system, low
power supply system, preferential circuit and escape route.
___________
1
 The first edition of IEC 60364-5-56, which was published in 1980, together with its amendment (1998), was
withdrawn when its contents were incorporated into the first edition of IEC 60364-5-55.

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2) Automatic supplies are now classified according to the maximum changeover times, for

example a supply classified as short break means an automatic supply is available within

0,5 s.

3) Safety sources that can operate in parallel are specifically recognized in 560.6.9.


4) Requirements are now given for batteries used for safety sources for central and low

power supply sources.

5) Drawings are now required, such as a single-line diagram, drawings showing the location

of equipment and a list of equipment permanently connected to the safety power supply.

6) Operating instructions are now required.


7) Detailed requirements are now given for emergency escape lighting applications, direct
current circuits and fire protection applications.
8) Additional requirements for initial verification and periodic inspection and testing are now
included in the standard.
9) Two annexes are now included (Annex A and Annex B) giving guidance for emergency
lighting and guidance for fire protection equipment, respectively.
The text of this standard is based on the following documents:
FDIS Report on voting
64/1677/FDIS 64/1686/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.
The reader’s attention is drawn to the fact that Annex C lists all of the “in-some-country”
clauses on differing practices of a less permanent nature relating to the subject of this
standard.
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 maintenance result 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.

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LOW-VOLTAGE ELECTRICAL INSTALLATIONS –



Part 5-56: Selection and erection of electrical equipment –

Safety services








560.1 Scope


This part of IEC 60364 covers general requirements for safety services, selection and erection
of electrical supply systems for safety services and electrical safety sources.
Standby electrical supply systems are outside the scope of this part. This part does not apply
to installations in hazardous areas (BE3), for which requirements are given in IEC 60079-14.
560.2 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 60331 (all parts), Tests for electric cables under fire conditions – Circuit integrity
IEC 60332-1-2, Tests on electric and optical fibre cables under fire conditions - Part 1-2: Test
for vertical flame propagation for a single insulated wire or cable - Procedure for 1 kW pre-
mixed flame
IEC 60364-4-43:2008, Low-voltage electrical installations – Part 4-43: Protection for safety –
Protection against overcurrent
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: Terminations
IEC 62040-1-1, Uninterruptible power systems (UPS) – Part 1-1: General and safety
requirements for UPS in operator access areas

IEC 62040-1-2, Uninterruptible power systems (UPS) – Part 1-2: General and safety
requirements for UPS used in restricted access locations
IEC 62040-3, Uninterruptible power systems (UPS) – Part 3: Method of specifying the
performance and test requirements
ISO 8528-12, Reciprocating internal combustion engine driven alternating current generating
sets – Part 12: Emergency power supply to safety services
CIE S 020/ISO 30061:2007, Emergency lighting

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560.3 Terms and definitions


For the purposes of this document, the following terms and definitions apply.


560.3.1

electrical supply system for safety services

supply system intended to maintain the operation of essential parts of an electrical installation

and equipment:


− for the health and safety of persons and livestock, and/or

− to avoid damage to the environment and to other equipment
NOTE 1 The supply system includes the source and the electrical circuits up to the terminals of electrical
equipment.
NOTE 2 Examples of safety services include:
– emergency (escape) lighting;
– fire pumps;
– fire rescue services lifts;
– alarm systems, such as fire alarms, CO alarms and intruder alarms;
– evacuation systems;
– smoke extraction systems;
– essential medical systems.
560.3.2
electrical source for safety services
electrical source intended to be used as part of an electrical supply system for safety services
560.3.3
electrical circuit for safety services
electrical circuit intended to be used as part of an electrical supply system for safety services
560.3.4
standby electrical supply system
supply system intended to maintain, for reasons other than safety, the functioning of an
electrical installation or parts thereof, in case of interruption of the normal supply
560.3.5
standby electrical source
electrical source intended to maintain, for reasons other than safety, the supply to an
electrical installation or parts thereof, in case of interruption of the normal supply

560.3.6
emergency lighting
lighting provided for use when the supply to the normal lighting fails
[CIE S 0 20/ISO 30061:2007, definition 4.1]
560.3.7
emergency lighting luminaire
luminaire which may or may not be provided with its own electrical source for safety services
and which is used for safety or emergency lighting
560.3.8
escape sign luminaire
luminaire that indicates and assists the identification of escape routes

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60364-5-56 © IEC:2009 – 7 –


560.3.9
maintained mode

operating mode of a lighting system in which the emergency lighting lamps are energized at

all times when normal or emergency lighting is required


560.3.10

non-maintained mode

operating mode of a lighting system in which the emergency lighting lamps are in operation

only when the supply to the normal lighting fails


560.3.11

response time
time that elapses between the failure of the normal power supply and the auxiliary power
supply energizing the equipment
560.3.12
central power supply system (unlimited power)
system which supplies the required emergency power to essential safety equipment without
any limitation in power output
560.3.13
central low-power supply system (low power output)
central power supply system with a limitation of the power output of the system at 500 W for
3 h or 1 500 W for 1 h
NOTE A low-power supply system normally comprises a maintenance-free battery and a charging and testing unit.
560.3.14
escape route
path to follow for access to a safe area in the event of an emergency
560.3.15
preferential circuit
safety source derived directly from the incoming supply to the building intended to supply
safety services which, in case of emergency, shall remain in operation for as long as possible
NOTE An example of such a safety service is sprinkler pumps.
560.3.16
minimum illuminance
Illuminance for emergency lighting at the end of the rated operating time

560.3.17
safety service
electrical system for electrical equipment provided to protect or warn persons in the event of a
hazard, or essential to their evacuation from a location
560.4 Classification
560.4.1 An electrical supply system for safety services is either:
– a non-automatic supply, the starting of which is initiated by an operator, or
– an automatic supply, the starting of which is independent of an operator.
An automatic supply is classified as follows, according to the maximum changeover time:
– no-break: an automatic supply which can ensure a continuous supply within specified
conditions during the period of transition, for example as regards variations in voltage and
frequency;

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– very short break: an automatic supply available within 0,15 s;

– short break: an automatic supply available within 0,5 s;


– average break: an automatic supply available within 5 s;

– medium break: an automatic supply available within 15 s;

– long break: an automatic supply available in more than 15 s.


560.4.2 The essential equipment for safety services shall be compatible with the changeover

time in order to maintain the specified operation.



560.5 General
560.5.1 Safety services may be required to operate at all relevant times including during
main and local supply failure and through fire conditions. To meet these requirements,
specific sources, equipment, circuits and wiring are necessary. Some applications also have
particular requirements, as in 560.5.2 and 560.5.3.
560.5.2 For safety services required to operate in fire conditions, the following additional two
conditions shall be fulfilled:
– an electrical source for safety supply shall be selected in order to maintain a supply of
adequate duration, and
– all equipment of safety services shall be provided, either by construction or by erection,
with protection ensuring fire resistance of adequate duration.
NOTE The electrical safety supply source is generally additional to the normal supply source, for example the
public supply network.
560.5.3 Where automatic disconnection of supply is used as a protective measure against
electric shock, non-disconnection on the first fault is preferred. In IT systems, insulation
monitoring devices shall be provided which give an audible and visible indication in the event
of a first fault.
560.5.4 Regarding control and bus systems, a failure in the control or bus system of a
normal installation shall not adversely affect the function of safety services.
560.6 Electrical sources for safety services
560.6.1 The following electrical sources for safety services are recognized:
– storage batteries;

– primary cells;
– generator sets independent of the normal supply;
– a separate feeder of the supply network that is effectively independent of the normal
feeder.
560.6.2 Safety sources for safety services shall be installed as fixed equipment and in such
a manner that they cannot be adversely affected by failure of the normal source.
560.6.3 Safety sources shall be installed in a suitable location and be accessible only to
skilled or instructed persons (BA5 or BA4).
560.6.4 The location of the safety source shall be properly and adequately ventilated so that
exhaust gases, smoke or fumes from the safety source cannot penetrate areas occupied by
persons.

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60364-5-56 © IEC:2009 – 9 –


560.6.5 Separate, independent feeders from a supply network shall not serve as electrical

sources for safety services unless assurance can be obtained that the two supplies are

unlikely to fail concurrently.


560.6.6 The safety source shall have sufficient capability to supply its related safety service.


560.6.7 A safety source may, in addition, be used for purposes other than safety services,

provided the availability for safety services is not thereby impaired. A fault occurring in a

circuit for purposes other than safety services shall not cause the interruption of any circuit for

safety services.


560.6.8 Special requirements for safety sources not capable of operation in parallel
560.6.8.1 Adequate precautions shall be taken to avoid the paralleling of sources.
NOTE This may be achieved by mechanical interlocking.
560.6.8.2 Short-circuit protection and fault protection shall be ensured for each source.
560.6.9 Special requirements for safety services having sources capable of operation
in parallel
NOTE 1 The parallel operation of independent sources normally requires the authorization of the supply
undertaking. This may require special devices, for example to prevent reverse power.
Short-circuit protection and fault protection shall be ensured when the installation is supplied
separately by either of the two sources or by both in parallel.
NOTE 2 Precautions may be necessary to limit current circulation in the connection between the neutral points of
the sources, in particular the effect of third harmonics.
560.6.10 Central power supply system
Batteries shall be of vented or valve-regulated maintenance-free type and shall be of heavy
duty industrial design, for example cells complying with IEC 60623 or the IEC 60896 series.
NOTE The minimum design life of the batteries at 20 °C should be 10 years.
560.6.11 Low-power supply system
The power output of a low-power supply system is limited to 500 W for a 3 h duration and
1500 W for a 1 h duration. Batteries can be of gas-tight or valve-regulated maintenance-free
type and shall be of heavy duty industrial design, for example cells complying with IEC 60623
or the IEC 60896 series.

NOTE The minimum design life of the batteries at 20 °C should be 5 years.
560.6.12 Uninterruptible power supply sources
Where an uninterruptible power supply is used, it shall:
a) be able to operate distribution circuit protective devices, and
b) be able to start the safety devices when it is operating in the emergency condition from the
inverter supplied by the battery, and
c) comply with the requirements of 560.6.10, and
d) comply with IEC 62040-1-1, IEC 62040-1-2 or IEC 62040-3, as applicable.
560.6.13 Safety generating sets
Where a safety generating set is used as a safety source, it shall comply with ISO 8528-12.

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560.6.14 The condition of the source for safety services (ready for operation, under fault

conditions, feeding from the source for safety services) shall be monitored.



560.7 Circuits of safety services


560.7.1 Circuits of safety services shall be independent of other circuits.


NOTE This means that an electrical fault or any intervention or modification in one system must not affect the
correct functioning of the other. This may necessitate separation by fire-resistant materials or different routes or

enclosures.


560.7.2 Circuits of safety services shall not pass through locations exposed to fire risk (BE2)
unless they are fire-resistant. The circuits shall not, in any case, pass through zones exposed
to explosion risk (BE3).
NOTE Where practicable, the passage of any circuit through locations presenting a fire risk should be avoided.
560.7.3 According to 433.3 of IEC 60364-4-43, protection against overload may be omitted
where the loss of supply may cause a greater hazard. Where protection against overload is
omitted, the occurrence of an overload shall be monitored.
560.7.4 Overcurrent protective devices shall be selected and erected so as to avoid an
overcurrent in one circuit impairing the correct operation of circuits of safety services.
560.7.5 Switchgear and controlgear shall be clearly identified and grouped in locations
accessible only to skilled or instructed persons (BA5 or BA4).
560.7.6 In equipment supplied by two different circuits with independent sources, a fault
occurring in one circuit shall not impair the protection against electric shock, nor the correct
operation of the other circuit. Such equipment shall be connected to the protective conductors
of both circuits, if necessary.
560.7.7 Safety circuit cables, other than metallic screened, fire-resistant cables, shall be
adequately and reliably separated by distance or by barriers from other circuit cables,
including other safety circuit cables.
NOTE For battery cables, special requirements may apply.
560.7.8 Circuits for safety services, with the exception of wiring for fire rescue service lift
supply cables, and wiring for lifts with special requirements, shall not be installed in lift shafts
or other flue-like openings.

560.7.9 In addition to a general schematic diagram, full details of all electrical safety
sources shall be given. The information shall be maintained adjacent to the distribution board.
A single-line diagram is sufficient.
560.7.10 Drawings of the electrical safety installations shall be available showing the exact
location of
– all electrical equipment and distribution boards, with equipment designations,
– safety equipment with final circuit designation and particulars and purpose of the
equipment;
– special switching and monitoring equipment for the safety power supply (e.g. area
switches, visual or acoustic warning equipment).
560.7.11 A list of all the current-using equipment permanently connected to the safety power
supply, indicating the nominal electrical power, nominal currents and starting currents and
time for current-using equipment, shall be provided.

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60364-5-56 © IEC:2009 – 11 –


NOTE This information may be included in the circuit diagrams.


560.7.12 Operating instructions f
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