SIST HD 60364-5-56:2019

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

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.

Errichten von Niederspannungsanlagen - Teil 5-56: Auswahl und Errichtung elektrischer Betriebsmittel - Einrichtungen für Sicherheitszwecke

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

IEC 60364-5-56:2018 est disponible sous forme de IEC 60364-5-56:2018 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.

Nizkonapetostne električne inštalacije - 5-56. del: Izbira in namestitev električne opreme - Varnostno napajanje

Ta del standarda IEC 60364 zajema splošne zahteve za varnostno napajanje, izbiro in namestitev napajanja za varnostno napajanje in vir električne energije za varnostno napajanje. Rezervno napajanje ne spada na področje uporabe tega dokumenta. Ta dokument se ne uporablja za inštalacije na nevarnih območjih (BE3), za katere so zahteve določene v standardu IEC 60079-14.

General Information

• Status: Published
• Publication Date: 10-Feb-2019
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: ELI - Electrical and communication installations
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 10-Jan-2019
• Due Date: 17-Mar-2019
• Completion Date: 11-Feb-2019
• Ref Project: HD 60364-5-56:2018 - Low-voltage electrical installations - Part 5-56: Selection and erection of electrical equipment - Safety services

Relations

• Replaces: SIST HD 60364-5-56:2011/A1:2012 - Low-voltage electrical installations - Part 5-56: Selection and erection of electrical equipment - Safety services
• Effective Date: 01-Mar-2019
• Replaces: SIST HD 60364-5-56:2011/A11:2013 - Low-voltage electrical installations - Part 5-56: Selection and erection of electrical equipment - Safety services
• Effective Date: 01-Mar-2019
• Replaces: SIST HD 60364-5-56:2011/A12:2017 - Low-voltage electrical installations - Part 5-56: Selection and erection of electrical equipment - Safety services
• Effective Date: 01-Mar-2019
• Replaces: SIST HD 60364-5-56:2011 - Low-voltage electrical installations -- Part 5-56: Selection and erection of electrical equipment - Safety services
• Effective Date: 01-Mar-2019
• Replaces: SIST HD 60364-5-56:2011/A1:2012 - Low-voltage electrical installations - Part 5-56: Selection and erection of electrical equipment - Safety services
• Effective Date: 07-Jun-2022
• Replaces: SIST HD 60364-5-56:2011/A11:2013 - Low-voltage electrical installations - Part 5-56: Selection and erection of electrical equipment - Safety services
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST HD 60364-5-56:2019
01-marec-2019
1DGRPHãþD
SIST HD 60364-5-56:2011
SIST HD 60364-5-56:2011/A1:2012
SIST HD 60364-5-56:2011/A11:2013
SIST HD 60364-5-56:2011/A12:2017
1L]NRQDSHWRVWQHHOHNWULþQHLQãWDODFLMHGHO,]ELUDLQQDPHVWLWHYHOHNWULþQH
RSUHPH9DUQRVWQRQDSDMDQMH
Low-voltage electrical installations - Part 5-56: Selection and erection of electrical
equipment - Safety services
Errichten von Niederspannungsanlagen - Teil 5-56: Auswahl und Errichtung elektrischer
Betriebsmittel - Einrichtungen für Sicherheitszwecke
Installations électriques à basse tension - Partie 5-56: Choix et mise en oeuvre des
matériels - Services de sécurité
Ta slovenski standard je istoveten z: HD 60364-5-56:2018
ICS:
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
SIST HD 60364-5-56:2019 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST HD 60364-5-56:2019

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SIST HD 60364-5-56:2019


HARMONIZATION DOCUMENT HD 60364-5-56

DOCUMENT D'HARMONISATION

HARMONISIERUNGSDOKUMENT
December 2018
ICS 91.140.50 Supersedes HD 60364-5-56:2010
HD 60364-5-56:2010/A1:2011
HD 60364-5-56:2010/A11:2013
HD 60364-5-56:2010/A12:2017
English Version
Low-voltage electrical installations - Part 5-56: Selection and
erection of electrical equipment - Safety services
(IEC 60364-5-56:2018)
Installations électriques à basse tension - Partie 5-56: Choix Errichten von Niederspannungsanlagen - Teil 5-56:
et mise en oeuvre des matériels - Installations de sécurité Auswahl und Errichtung elektrischer Betriebsmittel -
(IEC 60364-5-56:2018) Einrichtungen für Sicherheitszwecke
(IEC 60364-5-56:2018)
This Harmonization Document was approved by CENELEC on 2018-12-07. CENELEC members are bound to comply with the
CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of this Harmonization Document at national level.
Up-to-date lists and bibliographical references concerning such national implementations may be obtained on application to the CEN-
CENELEC Management Centre or to any CENELEC member.
This Harmonization Document exists in three official versions (English, French, German).
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. HD 60364-5-56:2018 E

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SIST HD 60364-5-56:2019
HD 60364-5-56:2018 (E)
European foreword
The text of document 64/2316/FDIS, future edition 3 of IEC 60364-5-56, prepared by IEC/TC 64
"Electrical installations and protection against electric shock" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as HD 60364-5-56:2018.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2019-09-07
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2021-12-07
document have to be withdrawn

This document supersedes HD 60364-5-56:2010, HD 60364-5-56:2010/A1:2011,
HD 60364‑5‑56:2010/A11:2013, and HD 60364-5-56:2010/A12:2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 60364-5-56:2018 was approved by CENELEC as a
European Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60079-14 NOTE Harmonized as EN 60079-14
IEC 60364-4-43:2008 NOTE Harmonized as HD 60364-4-43:2010 (modified)
IEC 60623 NOTE Harmonized as EN 60623
IEC 60896 (series) NOTE Harmonized as EN 60896 (series)
IEC 61508-4:2010 NOTE Harmonized as EN 61508-4:2010 (not modified)
IEC 62034 NOTE Harmonized as EN 62034

2

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SIST HD 60364-5-56:2019
HD 60364-5-56:2018 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60331 series Tests for electric cables under fire conditions - - -
Circuit integrity
IEC 60332-1-2 -  Tests on electric and optical fibre cables under fire EN 60332-1-2 -
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: HD 60364-4-41 2017
(mod) Protection for safety - Protection against electric
shock
- -   + A11 2017
IEC 60364-5-52 -  Low-voltage electrical installations - Part 5-52: HD 60364-5-52 -
Selection and erection of electrical equipment -
Wiring systems
IEC 60598-2-22 -  Luminaires - Part 2-22: Particular requirements - EN 60598-2-22 -
Luminaires for emergency lighting
IEC 60702-1 -  Mineral insulated cables and their terminations EN 60702-1 -
with a rated voltage not exceeding 750 V - Part 1:
Cables
IEC 60702-2 -  Mineral insulated cables and their terminations EN 60702-2 -
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: EN IEC 62040-2 -
Electromagnetic compatibility (EMC) requirements
IEC 62040-3 -  Uninterruptible power systems (UPS) - Part 3: EN 62040-3 -
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
ISO 30061 2007 Emergency lighting - -

3

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SIST HD 60364-5-56:2019



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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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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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,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60364-5-56 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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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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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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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 elect
...