IEC 60364-5-56:2018
(Main)Low-voltage electrical installations - Part 5-56: Selection and erection of electrical equipment - Safety services
Low-voltage electrical installations - Part 5-56: Selection and erection of electrical equipment - Safety services
IEC 60364-5-56:2018 is available as IEC 60364-5-56:2018 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition. IEC 60364-5-56:2018 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 third edition cancels and replaces the second edition published in 2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
1) Modifications to normative references and terms and definitions.
2) Under electrical circuits for safety services, addition of requirements concerning circuit and overcurrent protection in order to maintain reliability of safety service power supplies under fire conditions.
3) Under electrical circuits for safety services, addition of requirements stating that circuits for safety services are not to be protected by RCDs or AFDDs.
4) Under emergency lighting applications, addition of requirements to prevent emergency lighting systems being adversely affected by any control system.
5) Addition of requirements for all emergency luminaires in the area to provide full design light output in the event of any final circuit failure.
6) Addition of a new Annex D (informative): Fire switch.
7) Addition of a new Annex E (informative): Example of installation methods of safety services with cable management system.
8) Addition of a new Annex F (informative): Wiring systems.
9) Addition of a new Annex G (informative): Guidance on suitable locations for electrical sources for safety services.
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IEC 60364-5-56
®
Edition 3.0 2018-11
INTERNATIONAL
STANDARD
Low-voltage electrical installations –
Part 5-56: Selection and erection of electrical equipment – Safety services
IEC 60364-5-56:2018-11(en)
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IEC 60364-5-56
®
Edition 3.0 2018-11
INTERNATIONAL
STANDARD
Low-voltage electrical installations –
Part 5-56: Selection and erection of electrical equipment – Safety services
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 91.140.50 ISBN 978-2-8322-6180-4
Warning! Make sure that you obtained this publication from an authorized distributor.
® Registered trademark of the International Electrotechnical Commission
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– 2 – IEC 60364-5-56:2018 © IEC 2018
CONTENTS
FOREWORD . 3
560.1 Scope . 5
560.2 Normative references . 5
560.3 Terms and definitions . 6
560.4 Classification . 8
560.5 General . 8
560.6 Electrical sources for safety services . 9
560.7 Electrical circuits of safety services. 10
560.8 Wiring systems . 11
560.9 Emergency lighting applications . 12
560.10 Fire protection applications/equipment . 14
Annex A (informative) Guidance for emergency lighting . 15
Annex B (informative) Guidance for fire protection equipment . 16
Annex C (informative) List of notes concerning certain countries . 17
Annex D (informative) Fire switch . 21
Annex E (informative) Example of installation methods of safety services with cable
management system . 22
Annex F (informative) Wiring systems . 23
F.1 Ambient test temperature rise . 23
F.2 Duration of the safety service. 23
F.3 Expected resistance of feeder conductors . 23
F.4 Protection against electric shock in the event of a failure by means of the
touch voltage reduction . 24
F.5 Conductor resistance in case of fire . 24
F.6 High temperature effects . 25
F.7 Feeder circuits . 25
Annex G (informative) Guidance on suitable locations for electrical sources for safety
services . 26
G.1 Recommendations for a suitable location for an electrical source for safety
services . 26
G.2 Conditions of fire protection . 26
Bibliography . 27
Figure D.1 – Fire switch installation . 21
Figure E.1 – Example of cable installation for safety services . 22
Table A.1 – Guidance for emergency lighting . 15
Table B.1 – Guidance for safety equipment . 16
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IEC 60364-5-56:2018 © IEC 2018 – 3 –
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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International Standard IEC 60364-5-56 has been prepared by IEC technical committee 64:
Electrical installations and protection against electric shock.
This third edition cancels and replaces the second edition published in 2009. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
1) Modifications to normative references and terms and definitions.
2) Under electrical circuits for safety services, addition of requirements concerning circuit
and overcurrent protection in order to maintain reliability of safety service power supplies
under fire conditions.
3) Under electrical circuits for safety services, addition of requirements stating that circuits
for safety services are not to be protected by RCDs or AFDDs.
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4) Under emergency lighting applications, addition of requirements to prevent emergency
lighting systems being adversely affected by any control system.
5) Addition of requirements for all emergency luminaires in the area to provide full design
light output in the event of any final circuit failure.
6) Addition of a new Annex D (informative): Fire switch.
7) Addition of a new Annex E (informative): Example of installation methods of safety
services with cable management system.
8) Addition of a new Annex F (informative): Wiring systems.
9) Addition of a new Annex G (informative): Guidance on suitable locations for electrical
sources for safety services.
The text of this International Standard is based on the following documents:
FDIS Report on voting
64/2316/FDIS 64/2341/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
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, published under the general title Low-voltage
electrical installations, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
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IEC 60364-5-56:2018 © IEC 2018 – 5 –
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 the electrical source for safety services.
Standby electrical supply systems are outside the scope of this document. This document
does not apply to installations in hazardous areas (BE3), for which requirements are given in
IEC 60079-14.
560.2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 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 60364-4-41:2005, Low-voltage electrical installations – Part 4-41: Protection for safety –
Protection against electric shock
IEC 60364-5-52, Low-voltage electrical installations – Part 5-52: Selection and erection of
electrical equipment – Wiring systems
IEC 60598-2-22, Luminaires – Part 2-22: Particular requirements – Luminaires for emergency
lighting
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, Uninterruptible power systems (UPS) – Part 1: Safety requirements
IEC 62040-2, Uninterruptible power systems (UPS) – Part 2: Electromagnetic compatibility
(EMC) requirements
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
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ISO 30061:2007, Emergency lighting
560.3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
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 to entry: The supply system includes the source and the electrical circuits up to the terminals of electrical
equipment.
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 circuits for safety services
electrical circuits 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
[SOURCE: ISO 30061:2007, 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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IEC 60364-5-56:2018 © IEC 2018 – 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 electrical source for
safety services energizing the equipment
560.3.12
central power supply system
system which supplies the required emergency power to essential safety equipment
560.3.13
escape route
route to follow for access to a safe area in the event of an emergency
560.3.14
preferential circuit
circuit 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
560.3.15
minimum illuminance
illuminance for emergency lighting throughout the whole rated operating time
560.3.16
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
EXAMPLE:
– 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.
Note 1 to entry: Safety services is equipment installed in buildings to detect fire or danger in its initial stage, also
limit fire spread and extinguish fire and control smoke and enable safe and effective evacuation
560.3.17
fire condition
condition defined by the temperature-time curve of ISO 834-1, or by local legislation
560.3.18
suitable location
constructional enclosure or separate fire protected compartment or room ensuring normal
operation of equipment under fire conditions
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560.3.19
fire switch
electrical apparatus, which shall be used to disconnect all circuits with the exception of
circuits supplying the equipment whose operation during a fire is necessary
Note 1 to entry: The installation and characteristics of fire switch are described in Annex D (informative).
Note 2 to entry: The switch could be a circuit breaker or disconnector.
560.4 Classification
560.4.1 An electrical supply system for safety services is either:
– a non-automatic supply system, the starting of which is initiated by an operator, or
– an automatic supply system, the starting of which is independent of an operator.
An automatic supply system is classified as follows, according to the maximum changeover
time:
– class A – no-break: an automatic supply system which can ensure a continuous supply
within specified conditions during the period of transition, for example as regards
variations in voltage and frequency;
– class B – very short break: an automatic supply system available within 0,15 s;
– class C – short break: an automatic supply system available within 0,5 s;
– class D – average break: an automatic supply system available within 5 s;
– class E – medium break: an automatic supply system available within 15 s;
– class F – long break: an automatic supply system available in more than 15 s.
560.4.2 The essential equipment for safety services shall be within the specified class
according to 560.4.1 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
conditions shall be fulfilled:
– one or more electrical sources for safety services shall be provided to maintain a supply of
adequate duration, except for preferential circuits and all equipment of safety services
shall be provided, either by construction or by erection, with fire protection ensuring
normal operation in fire conditions of adequate duration.
NOTE 1 Equipment includes for example, power sources, feeder conductors, cable management systems,
junction boxes.
NOTE 2 The electrical source for safety services is generally additional to the normal supply source, for example
the public supply network.
NOTE 3 Local legislation can apply.
560.5.3 An IT system is preferred where non-disconnection on the first fault is required. In IT
systems for safety services, insulation monitoring devices shall be provided which give an
audible and visible indication in the event of a first fault.
NOTE For IT systems after first fault see IEC 60364-4-41:2005, 411.6.4.
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IEC 60364-5-56:2018 © IEC 2018 – 9 –
560.5.4 A failure in the control or bus systems (control technology) of the non-safety
services installation shall not adversely affect the proper function of safety services. This
applies to control or bus systems of different safety services as well.
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 The electrical source for safety services shall be installed as fixed equipment and in
such a manner that it cannot be adversely affected by failure of the normal source.
560.6.3 The electrical source for safety services shall be installed in a suitable location and
be accessible only to skilled or instructed persons (BA5 or BA4). Electrical sources for safety
services should be segregated from other sources.
Safety services and sources shall be designed and located so as to minimize hazards that
could cause fire, flooding, freezing, vandalism and other adverse conditions and impact the
availability of the electrical supply.
NOTE See Annex G for guidance.
560.6.4 The location of the electrical source for safety services shall be properly and
adequately ventilated so that exhaust gases, smoke or fumes from the safety source cannot
penetrate areas occupied by persons.
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 electrical source for safety services shall have sufficient capability to supply its
related safety service.
560.6.7 An electrical source for safety services 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 There are special requirements for safety sources not capable of operation in
parallel.
Adequate precautions shall be taken to avoid the paralleling of sources.
Short circuit protection and fault protection within the electrical supply system for safety
services shall be provided for each source.
560.6.9 There are special requirements for safety services having sources capable of
operation in parallel.
The parallel operation of independent sources may require special devices, for example to
prevent reverse power.
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NOTE The parallel operation of independent sources with the public supply can require the authorization of the
supply undertaking.
Fault protection and short circuit protection shall be provided when installation is supplied
separately by either of the two sources or by both in parallel.
Precautions shall be taken to limit current circulation in the connection between the neutral
points of the sources, in particular the effect of triple harmonics.
560.6.10 There are requirements for a central power supply system.
Batteries shall be of vented or valve-regulated type with reduced maintenance and shall be of
heavy duty industrial design, for example cells complying with IEC 60623 or IEC 60896 (all
parts). This does not preclude proven new technologies. The minimum design life of the
batteries at 20 ºC shall be 10 years.
560.6.11 Where an uninterruptible power supply (UPS) is used, it shall:
a) be able to operate all protective devices located on the load side of the UPS,
b) be able to start the safety services when it is operating in the emergency condition,
c) comply with the requirements of 560.6.10, as applicable,
d) comply with IEC 62040-1, IEC 62040-2 or IEC 62040-3, as applicable, and
e) be able to be started independently of the availability of the upstream supply.
560.6.12 Where a safety generating set is used as an electrical source for safety services, a
diesel engine driven generating set shall comply with ISO 8528-12.
560.6.13 The condition of the electrical source for safety services (ready for operation,
under fault conditions, feeding from the electrical source for safety services) shall be
monitored.
560.7 Electrical circuits of safety services
560.7.1 Circuits of safety services shall be independent of other circuits.
An electrical fault or any modification in one system shall 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
due to nature of processed or stored materials) unless they are fire-resistant. The circuits
shall not, in any case, pass through zones exposed to explosion risk (BE3). Where
practicable, the passage of any circuit through locations presenting a fire risk should be
avoided.
560.7.3 In accordance with IEC 60364-4-43:2008, 433.3.3, 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).
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IEC 60364-5-56:2018 © IEC 2018 – 11 –
560.7.6 In equipment supplied by two different circuits, 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 Circuits for safety services, with the exception of wiring for fire and rescue services
lift supply
...
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