ISO 7240-4:2017

INTERNATIONAL ISO
STANDARD 7240-4
Second edition
2017-11
Fire detection and alarm systems —
Part 4:
Power supply equipment
Systèmes de détection et d'alarme d'incendie —
Partie 4: Équipement d'alimentation électrique
Reference number
ISO 7240-4:2017(E)
©
ISO 2017

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ISO 7240-4:2017(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland
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ISO 7240-4:2017(E)

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 2
4.1 Symbols . 2
4.2 Abbreviated terms . 2
5 Requirements . 2
5.1 General . 2
5.2 Compliance . 2
5.3 Power sources . 3
5.3.1 General. 3
5.3.2 Main power source. 3
5.3.3 Standby power source . . 3
5.4 Charger . 4
5.5 Faults . 4
5.6 Mechanical . 5
5.7 Power supply interface . 5
5.8 Software . 5
5.8.1 General. 5
5.8.2 Program monitoring . 5
5.8.3 Storage of programs and data . 6
5.8.4 Monitoring of memory contents . 6
6 Tests . 6
6.1 General . 6
6.1.1 Standard atmospheric conditions for testing . 6
6.1.2 Mounting and orientation . 7
6.1.3 Electrical connection . 7
6.2 Functional tests . 7
6.2.1 The object of test. 7
6.2.2 Test schedule . 7
6.2.3 Full functional test . 8
6.2.4 Reduced functional test . 9
6.3 Charger and the standby power source test .10
6.3.1 Test procedure .10
6.3.2 Requirements .10
6.4 High battery impedance test .10
6.4.1 Object of test .10
6.4.2 General.10
6.4.3 Test procedure for non-integrated PSE .10
6.4.4 Requirements for integrated PSE .11
6.4.5 Test procedure for integrated PSE .11
6.4.6 Requirements for integrated PSE .12
6.5 Environmental tests .12
6.5.1 General.12
6.5.2 Tests for one specimen .13
6.5.3 Tests for more than one specimen .13
6.5.4 Requirements .13
6.6 Cold (operational) .14
6.6.1 Object of test .14
6.6.2 Test procedure .14
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ISO 7240-4:2017(E)

6.6.3 Requirements .14
6.7 Damp heat, steady-state (operational).15
6.7.1 Object of test .15
6.7.2 Test procedure .15
6.7.3 Requirements .15
6.8 Impact (operational) — Optional test .16
6.8.1 Object of test .16
6.8.2 Test procedure .16
6.8.3 Requirements .16
6.9 Vibration, sinusoidal (operational) — Optional test .17
6.9.1 Object of test .17
6.9.2 Test procedure .17
6.9.3 Requirements .18
6.10 Electromagnetic compatibility (EMC), Immunity tests (operational) .18
6.11 Damp heat, steady state (endurance) .18
6.11.1 Object of test .18
6.11.2 Test procedure .18
6.11.3 Requirements .19
6.12 Vibration, sinusoidal (endurance) — Optional test .19
6.12.1 Object of test .19
6.12.2 Test procedure .19
6.12.3 Requirements .20
6.13 Dry heat (operational) (optional) .20
6.13.1 Object of test .20
6.13.2 Test procedure .20
6.13.3 Requirements .21
7 Test report .21
8 Marking .21
9 Data .22
9.1 General .22
9.2 Software documentation .22
9.3 Hardware documentation .23
9.4 Installation and user documentation .23
Annex A (informative) .24
Bibliography .25
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ISO 7240-4:2017(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire
fighting, Subcommittee SC 3, Fire detection and alarm systems.
This second edition cancels and replaces the first edition (ISO 7240-4:2003), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— this document has been reformatted and modified to comply with the current ISO structure for
standards;
— a reference has been made to power ratings in place of current ratings as this is better with custom
and practice of product specifications; however, it is expected that these new values can be derived
from previous test results quoted in voltage and current;
— the time limits for notification of some PSU faults have been added;
— an optional dry heat, (operational) test has been added.
A list of all the parts in the ISO 7240 series can be found on the ISO website.
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ISO 7240-4:2017(E)

Introduction
This document is based on ISO 7240-4:2003.
The power supply function (see ISO 7240-1:2014, Figure 1, item L), within a fire detection and alarm
system (FDAS) installed in and around buildings, is provided by power supply equipment (PSE). The
PSE provides power to all parts of the FDAS, either by direct connection or through one function to
another function.
This document is drafted on the basis of mandatory functions, which are to be provided on all the PSE
and optional functions (with requirements) which may be provided. It is intended that the options
be used for specific applications and to meet the fire detection and alarm system design objectives.
Each optional function is included as a separate entity, with its own set of associated requirements, in
order to permit the PSE with different combinations of functions to comply with this document. Other
functions associated with fire detection and fire alarm may also be provided, even if not specified in
this document.
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INTERNATIONAL STANDARD ISO 7240-4:2017(E)
Fire detection and alarm systems —
Part 4:
Power supply equipment
1 Scope
This document specifies requirements, test methods and performance criteria for power supply
equipment (PSE) for use in fire detection and alarm systems installed in buildings.
For the testing of other types of the PSE, this document is intended to be used only for guidance. The
PSE with special characteristics, developed for specific risks, are not covered in this document.
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.
ISO 7240-1:2014, Fire detection and alarm systems — Part 1: General and definitions
IEC 60068-1, Environmental testing — Part 1: General and guidance
IEC 60068-2-1, Environmental testing — Part 2: Tests. Tests A: cold
IEC 60068-2-6, Environmental testing — Part 2: Tests. Test Fc: vibration (sinusoidal)
IEC 60068-2-47, Environmental testing — Part 2: Test methods — Mounting of components, equipment and
other articles for vibration, impact and similar dynamic tests
IEC 60068-2-75, Environmental testing — Part 2: Tests — Test Eh: Hammer tests
IEC 60068-2-78, Environmental testing — Part 2-78: Tests – Test Cab: Damp heat, steady state
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60721-3-3:1994, Classification of environmental conditions — Part 3: Classification of groups of
environmental parameters and their severities —Section 3: Stationary use and weatherprotected locations
IEC 60950-1, Information technology equipment — Safety — Part 1: General requirements
IEC 62599-2, Alarm systems — Part 2: Electromagnetic compatibility — Immunity requirements for
components of fire and security alarm systems
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 7240-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
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ISO 7240-4:2017(E)

4 Symbols and abbreviated terms
4.1 Symbols
P rated maximum output power that can be supplied continuously
a, max
P rated maximum output power higher than P that can be supplied while battery
b, max a, max
charging is not required
P rated maximum output power higher which can be supplied by the standby power source
c, max
P minimum output power specified by the manufacturer
min
V nominal mains voltage of the public electricity supply
n
4.2 Abbreviated terms
FDAS fire detection and alarm system
FDCIE fire detection control and indicating equipment
PSE power supply equipment
5 Requirements
5.1 General
5.1.1 The PSE shall have safety characteristics in accordance with IEC 60950-1 for protection against
direct and indirect contact, for the separation of the extra low voltage DC circuits from the low voltage AC
circuits and for earthing of metal parts.
5.1.2 All outputs shall have appropriate power limitations in order to ensure that in case of external
short circuits no danger exists because of heat production.
5.2 Compliance
5.2.1 In order to comply with this document, the PSE shall meet the following requirements.
a) Clause 5, which shall be verified by visual inspection or engineering assessment, shall be tested in
accordance with Clause 6 and shall meet the requirements of the tests.
b) Clauses 8 and 9, shall be verified by visual inspection.
5.2.2 If an optional function with requirements is included in the PSE, then all the corresponding
requirements shall be met.
5.2.3 If functions other than those specified in this document are provided, they shall not jeopardize
compliance with any requirement of this document.
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ISO 7240-4:2017(E)

5.3 Power sources
5.3.1 General
5.3.1.1 There shall be at least two power sources for the power supply of the FDAS: the main power
source and the standby power source.
5.3.1.2 Each power source, on its own, shall be capable of meeting the PSE manufacturer's output
specification or, in the case of an integrated the PSE, shall be capable of operating the equipment in which
it is integrated within its specifications.
5.3.1.3 Switching from one power source to the other shall not cause any change in status or indications
within other equipment of the FDAS, other than those relating to the power supply.
5.3.1.4 Failure of one of the power sources shall not cause the failure of any other power source or the
failure of the supply of power to the FDAS.
NOTE The compatibility of the separated PSE with the other equipment, for example, FDCIE, is dealt with in
ISO 7240-13.
5.3.2 Main power source
5.3.2.1 The main power source shall be designed to operate from the public electricity supply or
equivalent system.
5.3.2.2 When the main power source is available, it shall be the exclusive source of power to the FDAS,
except for currents associated with battery monitoring.
5.3.2.3 If the main power source fails, then the PSE shall automatically switch over to a standby power
source. When the main power source is restored, the PSE shall automatically switch back to the main
power source.
5.3.2.4 When operated from the main power source, the following shall apply.
a) The PSE shall be capable of operating in accordance with its specification given in the
manufacturer's data, irrespective of the condition of the standby power source. This includes any
charge condition of the standby power source, or open circuit or short circuit of the connection to
the standby power source.
b) The PSE shall be capable of continuously supplying P and simultaneously charging a battery
a, max
discharged to its final voltage.
c) It may allow battery charging to be limited or interrupted when the PSE is delivering power greater
than P (see note to Table 1).
a, max
5.3.3 Standby power source
5.3.3.1 At least one standby power source shall be a rechargeable battery.
5.3.3.2 When operated from the standby power source, the PSE shall be capable of operating in
accordance with the specification given in the manufacturer's data. The PSE shall be capable of supplying
P , irrespective of the condition of the main power source, and with an internal resistance of the
c, max
battery and its associated circuitry, e.g. connections, fuses (see 6.4) equal to R .
i, max
NOTE Standby periods and alarm periods for specific applications are specified in ISO 7240-14 and
ISO 7240-19, or other national design and installation standards where they take precedence.
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ISO 7240-4:2017(E)

5.3.3.3 The battery shall
— be rechargeable,
— be suitable to be maintained in a fully charged state,
— be constructed for stationary use,
— be marked with its type designation and code or number identifying the production period, and
— have a safety mechanism to prevent explosion.
5.3.3.4 If the battery is mounted in a cabinet which houses other FDAS equipment, then it shall be of
the sealed type and shall be mounted in accordance with the manufacturer's data.
5.3.3.5 When operating from a standby power source, the PSE shall have a facility to switch off the
PSE output if the output voltages or the voltage of the battery falls below a value specified by the PSE
manufacturer.
5.4 Charger
5.4.1 The PSE shall include charging equipment to charge the battery and maintain it in a fully
charged state.
5.4.2 The charger shall be designed and rated so that
— the battery can be charged automatically,
— a battery discharged to its final voltage can be recharged to at least 80 % of its rated capacity within
24 h and thereafter be
...