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 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
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
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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
– 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
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
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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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 60364-5-56 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.
– 4 – IEC 60364-5-56:2018 © IEC 2018
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.
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
– 6 – IEC 60364-5-56:2018 © IEC 2018
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
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
– 8 – IEC 60364-5-56:2018 © IEC 2018
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.
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.
– 10 – IEC 60364-5-56:2018 © IEC 2018
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).
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 cables, and wiring for lifts with special requirements, shall not be installed in lift
shafts or other flue-like openings (location).
560.7.8 In addition to a general schematic overview diagram, full details of all electrical
sources for safety services shall be given. Information shall be maintained adjacent to the
distribution board. A single line diagram is sufficient.
560.7.9 Drawings of the electrical safety installations shall be provided 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).
560.7.10 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.
NOTE This information is often included in circuit diagrams.
560.7.11 Operating instructions for safety equipment and electrical safety services shall be
available. They shall take into account all the particulars of the installation.
560.7.12 The circuit and overcurrent protection shall be considered in order to maintain
reliability of power supply of the safety services under fire conditions. See also 560.6.8.2.
560.7.13 Circuits of safety services shall not be protected by RCDs or AFDDs.
NOTE At elevated temperatures under fire conditions, leakage currents between conductors can occur leading to
unwanted tripping and loss of s
...
IEC 60364-5-56 ®
Edition 3.0 2018-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Low-voltage electrical installations –
Part 5-56: Selection and erection of electrical equipment – Safety services
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 21 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - webstore.iec.ch/advsearchform IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 67 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC 60364-5-56 ®
Edition 3.0 2018-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Low-voltage electrical installations –
Part 5-56: Selection and erection of electrical equipment – Safety services
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 91.140.50 ISBN 978-2-8322-6220-7
– 2 – IEC 60364-5-56:2018 RLV © IEC 2018
CONTENTS
FOREWORD . 3
560.1 Scope . 6
560.2 Normative references . 6
560.3 Terms and definitions . 7
560.4 Classification . 9
560.5 General . 10
560.6 Electrical sources for safety services . 10
560.7 Electrical circuits of safety services. 13
560.8 Wiring systems . 14
560.9 Emergency escape lighting applications . 15
560.10 Fire protection applications/equipment . 17
Annex A (informative) Guidance for emergency lighting . 18
Annex B (informative) Guidance for fire protection equipment . 20
Annex C (informative) List of notes concerning certain countries . 22
Annex D (informative) Fire switch . 29
Annex E (informative) Example of installation methods of safety services with cable
management system . 30
Annex F (informative) Wiring systems . 31
F.1 Ambient test temperature rise . 31
F.2 Duration of the safety service. 31
F.3 Expected resistance of feeder conductors . 31
F.4 Protection against electric shock in the event of a failure by means of the
touch voltage reduction . 32
F.5 Conductor resistance in case of fire . 32
F.6 High temperature effects . 33
F.7 Feeder circuits . 33
Annex G (informative) Guidance on suitable locations for electrical sources for safety
services . 34
G.1 Recommendations for a suitable location for an electrical source for safety
services . 34
G.2 Conditions of fire protection . 34
Bibliography . 35
Figure D.1 – Fire switch installation . 29
Figure E.1 – Example of cable installation for safety services . 30
Table A.1 – Guidance for emergency lighting . 18
Table B.1 – Guidance for safety equipment . 20
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE ELECTRICAL INSTALLATIONS –
Part 5-56: Selection and erection of electrical equipment –
Safety services
FOREWORD
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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This redline version of the official IEC Standard allows the user to identify the changes
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has been made. Additions are in green text, deletions are in strikethrough red text.
– 4 – IEC 60364-5-56:2018 RLV © IEC 2018
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.
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.
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 – IEC 60364-5-56:2018 RLV © IEC 2018
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 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 60364-4-43:2008, Low-voltage electrical installations – Part 4-43: Protection for safety –
Protection against overcurrent
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 62040-1-1, 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 62040-1, 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
CIE S 020/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.
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 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
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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: CIE S 0 20/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
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 electrical source for safety services 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.
560.3.13
escape route
path route to follow for access to a safe area in the event of an emergency
560.3.14
preferential circuit
safety source 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
NOTE An example of such a safety service is sprinkler pumps.
560.3.15
minimum illuminance
illuminance for emergency lighting at the end of 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
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.
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560.4.2 The essential equipment for safety services shall be compatible with the changeover
time 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 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.
– 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 safety supply source 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 Where automatic disconnection of supply is used as a protective measure against
electric shock, non-disconnection on the first fault is preferred. 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.
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. 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 Safety sources The electrical source for safety services shall be installed as fixed
equipment and in such a manner that they it cannot be adversely affected by failure of the
normal source.
560.6.3 Safety sources 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 safety source 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 safety source electrical source for safety services shall have sufficient
capability to supply its related safety service.
560.6.7 A safety source 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.
560.6.8.1 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.
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.
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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.
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.
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.
NOTE An electrical fault or any intervention or modification in one system must 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).
NOTE 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).
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.
560.7.7 Circuits for safety services, with the exception of wiring for fire and rescue services
lift supply cables, and wiring for lifts with special requirements, shall not be installed in lift
shafts or other flue-like openings (location).
560.7.8 In addition to a general schematic overview diagram, full details of all electrical
safety sources sources for safety services shall be given. Information shall be maintained
adjacent to the distribution board. A single line diagram is sufficient.
560.7.9 Drawings of the electrical safety installations shall be available provided 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).
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560.7.10 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.
NOTE This information may be is often included in circuit diagrams.
560.7.11 Operating instructions for safety equipment and electrical safety services shall be
available. They shall take into account all the particulars of the installation.
560.7.12 The circuit and overcurrent protection shall be considered in order to maintain
reliability of power supply of the safety services under fire conditions. See also 560.6.8.2.
560.7.13 Circuits of safety services shall not be protected by RCDs or AFDDs.
NOTE At elevated temperatures under fire conditions, leakage currents between conductors can occur leading to
unwanted tripping and loss of safety service.
560.8 Wiring systems
560.8.1 One or more of the following wiring systems shall be utilized for safety services
required to operate in fire conditions:
– mineral insulated cable complying with IEC 60702-1 and IEC 60702-2 and IEC 60332-1-2;
– fire-resistant cables complying with the appropriate part of the IEC 60331 series and with
IEC 60332–1-2;
– a wiring system maintaining the necessary fire and mechanical protection.
Wiring systems and their fixings shall be mounted and installed in such a way that the circuit
integrity will not be impaired during the fire.
In long vertical installations wiring systems shall have fire protection for their fixings to ensure
that under fire condition, cable fixings do not allow the cables to collapse prematurely.
NOTE 1 Examples of a system maintaining the necessary fire and mechanical protection could be constructional
enclosures to maintain fire and mechanical protection, or wiring systems in separate fire protected compartments.
NOTE 2 National legislation may can exist.
560.8.2 Wiring for control and bus systems of safety services shall be in accordance with the
same requirements as the wiring which is to be used for the safety services. This does not
apply to circuits that do not adversely affect the operation of the safety equipment.
This requirement also includes control and bus systems for self-contained luminaires.
Wireless control and bus systems shall be considered in an equivalent way.
560.8.3 Precautions shall be taken to prevent excavation damage to buried safety circuits.
Circuits for safety services which can be supplied by direct current shall be provided with two-
pole overcurrent protection mechanisms protective devices.
560.8.4 The higher resistance of conductors due to high temperature when exposed to fire
shall be taken into account when sizing the conductor cross-sectional area.
NOTE Information is given in Annex F for cables with copper conductors.
560.8.5 The wiring systems of safety services should be segregated from other services
other than metallic screened fire-resistant cables and installed in such a manner that the
safety services are not affected by any fault occurring on non-safety services and mitigate the
effects of a fire. An example of cables installed for safety services is shown in a diagram in
Annex E.
NOTE For battery cables, special requirements can apply.
560.8.6 Precautions shall be taken to prevent excavation damage to buried electrical circuits
for safety services.
560.8.7 Switchgear and controlgear used for both AC and DC supply sources shall be
suitable for both AC and DC operation.
560.9 Emergency escape lighting applications
560.9.1 Emergency escape lighting systems may be powered by a central power supply
system or the emergency lighting luminaires may be self-contained. Emergency lighting
luminaires shall comply with IEC 60598-2-22. The supply to self-contained emergency lighting
luminaires is excluded from the requirements of 560.9.1 to 560.9.4 inclusive 560.9.2.
560.9.2 Wiring systems for a centrally powered emergency lighting system shall retain the
continuity of supply from the source to each fire protected compartment where the emergency
lighting luminaires are installed for an adequate period in the event of a fire. This shall be
achieved by using cables wiring systems with a high resistance to fire, as detailed in 560.8.1
and 560.8.2, to transfer power through a other fire protected compartments.
Within the fire compartment, the supplies to the luminaire shall either use cables with a high
resistance to attack by fire or, for compartments having more than one emergency lighting
luminaire, such luminaires shall be wired alternately from at least two separate circuits so that
a level of illuminance is maintained along the escape route in the event of the loss of one
circuit.
Within fire protected compartments where the emergency lighting luminaires are installed, the
wiring system between emergency lighting luminaires has no requirements against fire.
For fire protected compartments having more than one emergency lighting luminaire, such
emergency lighting luminaires shall be wired alternately from at least two separate circuits so
that a suitable level of illuminance is maintained along the escape route in the event of the
loss of one circuit.
560.9.3 Where alternate emergency lighting luminaires are supplied by separate circuits,
overcurrent protective devices shall be used so that a short-circuit in one circuit does not
interrupt the supply to the adjacent emergency lighting luminaires within the fire protected
compartment or the emergency lighting luminaires in other fire protected compartments.
No more than 20 emergency lighting luminaires with a total load not exceeding 60 % of the
nominal current of the overcurrent protective device shall be supplied from any final circuit.
Any circuit distribution, control or protective devices shall not impair the circuit integrity.
560.9.4 A safe value of minimum illuminance, response time and rated operation time is
required to enable evacuation of a building. Where there are no national or local rules,
illumination systems should shall comply with CIE S 020/ISO 30061:2007.
NOTE Guidance on appropriate systems is given in Annex A (see Table A.1).
560.9.5 Emergency lighting shall be wired in maintained or non-maintained mode. These
modes may also be combined.
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560.9.6 In the non-maintained mode, the power supply for the normal lighting shall be
monitored at the final circuit for that area. If a loss of supply to the normal lighting in an area
causes the normal lighting to fail, the emergency lighting shall be activated automatically. In
all cases, arrangements shall be made to ensure that local emergency escape lighting will
operate in the event of failure of normal supply to the corresponding local area.
560.9.7 Where maintained and non-maintained modes are used in combination, the
changeover devices shall each have their own monitoring device and shall be able to be
switched separately.
560.9.8 The maintained mode of emergency lighting may be simultaneously switched with
normal lighting in locations which either
– cannot be darkened when in use, or
– are not constantly occupied.
560.9.8 Control and bus systems for safety illumination shall be independent of control and
bus systems for general illumination; coupling of both systems is permitted only with
interfaces that ensure a decoupling/isolation of both busses from each other. A failure in the
control and bus system of the general illumination shall not influence the proper function of
the safety illumination.
560.9.9 Emergency lighting systems shall not be adversely affected by any control systems.
Any future modifications of the control systems shall continue to comply with this functional
safety requirement. If a failure causes normal lighting in an area to fail, all emergency lighting
luminaires in the area shall operate. The emergency lighting luminaires in the area shall
provide full emergency design light output.
NOTE 1 For the definition of functional safety see IEC 61508-4:2010, 3.1.12.
NOTE 2 Here failure means a loss of supply or a failure of the control system.
560.9.10 Changeover from normal to emergency mode shall start automatically if the supply
voltage drops below 0,6 times the rated supply voltage for at least 0,5 s. It Normal mode shall
be restored if the supply voltage is greater than 0,85 times the rated supply voltage.
NOTE 1 The actual time for changeover may can depend on national rules.
NOTE 2 The level of changeover depends on the equipment used for safety services.
560.9.11 When the normal supply is restored to the distribution board or monitored circuit,
the emergency lighting in non-maint
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