ISO 7240-4:2003

Fire detection and alarm systems — Part 4: Power supply equipment

ISO 7240-4:2003 specifies requirements, test methods and performance criteria for power supply equipment (p.s.e.) for use in fire detection and alarm systems installed in buildings.

Systèmes de détection et d'alarme d'incendie — Partie 4: Équipement d'alimentation électrique

General Information

• Status: Withdrawn
• Publication Date: 10-Aug-2003
• Withdrawal Date: 10-Aug-2003
• ICS: 13.220.20 - Fire protection
• Technical Committee: ISO/TC 21/SC 3 - Fire detection and alarm systems
• Drafting Committee: ISO/TC 21/SC 3 - Fire detection and alarm systems
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 23-Nov-2017

Relations

• Revised: ISO 7240-4:2017 - Fire detection and alarm systems — Part 4: Power supply equipment
• Effective Date: 04-Nov-2015

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 7240-4
First edition
2003-08-01


Fire detection and alarm systems —
Part 4:
Power supply equipment
Systèmes de détection et d'alarme d'incendie —
Partie 4: Équipement d'alimentation électrique





RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORT-
ING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO 7240-4:2003(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
ISO 2003
NATIONAL REGULATIONS.

---------------------- Page: 1 ----------------------
ISO 7240-4:2003(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.


©  ISO 2003
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 ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland

ii © ISO 2003 — All rights reserved

---------------------- Page: 2 ----------------------
ISO 7240-4:2003(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references . 1
3 Terms, definitions and symbols . 2
4 General requirements . 2
5 Functions . 3
6 Materials, design and manufacture. 5
7 Documentation . 6
8 Marking. 6
9 Tests. 7

© ISO 2003 — All rights reserved iii

---------------------- Page: 3 ----------------------
ISO 7240-4:2003(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 7240-4 was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire fighting,
Subcommittee SC 3, Fire detection and alarm systems.
ISO 7240 consists of the following parts, under the general title Fire detection and alarm systems:
 Part 1: General and definitions
 Part 2: Control and indicating equipment
 Part 4: Power supply equipment
 Part 5: Point-type heat detectors
 Part 7: Point-type smoke detectors using scattered light transmitted light or ionization
 Part 11: Manual call points
 Part 14: Guidelines for drafting codes of practice for design, installation and use of fire detection and fire
alarm systems in and around buildings
 Part 15: Point-type multisensor (light and heat) fire detectors
Part 6, Point-type fire detectors for detection of carbon monoxide and Part 9, Fire sensitivity tests are under
preparation.
iv © ISO 2003 — All rights reserved

---------------------- Page: 4 ----------------------
ISO 7240-4:2003(E)
Introduction
This part of ISO 7240 is drafted on the basis of mandatory functions, which are to be provided on all
equipment, and optional (each with its own requirements). It is intended that the options be used for specific
applications, as recommended in application guidelines.
Each optional function is included as a separate entity, with its own set of associated requirements, in order to
permit equipment with many different combinations of functions to comply with this part of ISO 7240.
Other functions associated with fire detection and alarm can also be provided, even if not specified in this part
of ISO 7240.
© ISO 2003 — All rights reserved v

---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 7240-4:2003(E)

Fire detection and alarm systems —
Part 4
Power supply equipment
1 Scope
This part of ISO 7240 specifies requirements, test methods and performance criteria for power supply
equipment (p.s.e.) for use in fire detection and alarm systems installed in buildings.
It is not necessarily applicable to power supply equipment with special characteristics, developed for particular
applications, which could require further tests.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 7240-1:1988, Fire detection and alarm systems — Part 1: General and definitions
1)
ISO 7240-2:— , Fire detection and alarm systems — Part 2: Control and indicating equipment
IEC 60068-1, Environmental testing — Part 1: General and guidance
IEC 60068-2-1, Environmental testing — Part 2: Tests. Tests A: cold
IEC 60068-2-3, Environmental testing — Part 2: Tests. Test Ca: damp heat, steady state
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 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60721-3-3, Classification of environmental conditions — Part 3: Classification of groups of environmental
parameters and their severities —Section 3: Stationary use and weather protected locations
IEC 60950-1, Information technology equipment — Safety — Part 1: General requirements
EN 50130-4, Alarm systems — Part 4: Electromagnetic compatibility — Product family standard: Immunity
requirements for components of fire, intruder and social alarm systems

1) To be published.
© ISO 2003 — All rights reserved 1

---------------------- Page: 6 ----------------------
ISO 7240-4:2003(E)
3 Terms, definitions and symbols
For the purposes of this part of ISO 7240, the terms and definitions given in ISO 7240-1 and the following
terms, definitions and symbols apply. See also Figure 1 of ISO 7240-1:1988.
3.1 Terms and definitions
3.1.1
float voltage
voltage that when applied to the battery will maintain the battery in a fully charged state
NOTE The float voltage is specified by the battery manufacturer.
3.1.2
final voltage
lowest recommended voltage to which a battery should be discharged
NOTE The final voltage is specified by the battery manufacturer.
3.1.3
integrated p.s.e.
equipment for which it is not possible for the manufacturer to specify its output voltage range(s) or power
supply input voltage range(s) and, if in the case of a defective p.s.e., where the repair by replacement of the
p.s.e. involves replacement of a part or the whole of the other equipment
3.2 Symbols
3.2.1
I
a, max
rated maximum output current that can be supplied continuously
3.2.2
I
b, max
rated maximum output current that can be supplied for a short duration in which battery charging is not
required
3.2.3
I
min
〈integrated p.s.e.〉 minimum output current specified by the manufacturer
3.2.4
V
n
nominal voltage of the public electricity supply
4 General requirements
4.1 Compliance
In order to comply with this part of ISO 7240, the p.s.e. (Item L in Figure 1 of ISO 7240-1:1988) shall meet the
requirements of Clauses 4, 5, 6, 7 and 8, shall be tested in accordance with Clause 9 and shall meet the
requirements of the tests.
4.2 Power sources
4.2.1 There shall be at least two power sources for the power supply of a fire detection and alarm system:
the main power source and the standby power source.
2 © ISO 2003 — All rights reserved

---------------------- Page: 7 ----------------------
ISO 7240-4:2003(E)
4.2.2 The main power source shall be designed to operate from the public electricity supply or equivalent
system.
4.2.3 Where a battery is used, the p.s.e. shall include charging equipment to charge the battery and
maintain it in a fully charged state.
4.2.4 Each power source, on its own, shall be capable of meeting the p.s.e. manufacturer's output
specification or, in the case of an integrated p.s.e., shall be capable of operating the equipment in which it is
integrated within its specifications.
4.2.5 When the main power source is available, it shall be the exclusive source of power to the fire
detection and alarm system, except for currents associated with battery monitoring.
4.2.6 If the main power source fails, then the p.s.e. shall be automatically switched over to a standby power
source. When the main power source is restored, the p.s.e. shall be automatically switched back to the main
power source.
4.2.7 If the p.s.e. is integrated within other equipment of the fire detection and fire alarm system, then the
switching from one power source to the other shall not cause any change in status or indications, other than
those relating to the power supply.
4.2.8 If the p.s.e. is separated from other equipment of the fire detection and alarm system and the
switching from one power source to the other causes an interruption in supply of power, then the duration of
the interruption shall be specified in the manufacturer's data.
4.2.9 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 system.
NOTE The compatibility of the separated p.s.e. with the other equipment, for example the c.i.e. (control and
indicating equipment — Item B in Figure 1 of ISO 7240-1:1988), is intended to be dealt with in a future part 13, system
requirements.
5 Functions
5.1 Power supply from main power source
When operated from the main power source, the following applies.
a) The p.s.e. 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 p.s.e. shall be capable of continuously supplying I and simultaneously charging a battery
a, max
discharged to its final voltage.
c) It may allow battery charging to be limited or interrupted when delivering a current greater than I
a, max
(see note to Table 1).
5.2 Power supply from standby power source
5.2.1 When operated from the standby power source, the p.s.e. shall be capable of operating in accordance
with the specification given in the manufacturer's data, irrespective of the condition of the main power source.
It is intended that the standby and alarm periods required in any specific application should comply with a
future part 14, application guidelines.
© ISO 2003 — All rights reserved 3

---------------------- Page: 8 ----------------------
ISO 7240-4:2003(E)
5.2.2 When the standby power source consists of a battery it 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.
5.2.3 If the battery is mounted in a cabinet which houses other fire detection and alarm system equipment,
then it shall be of the sealed type and shall be mounted in accordance with the manufacturer's data.
5.2.4 When operating from a battery standby power source and where the battery is subject to damage
from over-discharge, the p.s.e. shall have a facility to switch off the p.s.e. output or outputs if the output
voltage or voltages, or the voltage of the battery, falls below a value specified by the battery manufacturer.
5.3 Charger
5.3.1 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 to its rated capacity within another 48 h, and
 the charging characteristics are within the battery manufacturer's specification over the ambient
temperature range of the battery.
5.3.2 Except for currents associated with battery monitoring, the battery shall not discharge through the
charger when the charging voltage is below the battery voltage.
5.4 Faults
The p.s.e. shall be capable of recognizing and signalling the following faults within 100 s of their occurrence:
a) a reduction in the main power source voltage to a level less than the minimum required to maintain the
output voltage within the specification;
b) loss of the standby power source;
c) reduction of the battery voltage to less than 0,9 of the final voltage when the primary power source is
unavailable;
d) reduction of the charger output to a level of less than 0,9 of the float voltage, except under the conditions
specified in 5.1 c).
5.4.1 If the p.s.e. is separately housed from the c.i.e, then at least a fault output common to the above-
mentioned faults shall be provided.
5.4.2 If the p.s.e. is housed within the cabinet of the c.i.e., then the above-mentioned faults shall be
2)
indicated in accordance with Clause 9 of ISO 7240-2:— , either on the c.i.e. or on the p.s.e. itself.

2) To be published.
4 © ISO 2003 — All rights reserved

---------------------- Page: 9 ----------------------
ISO 7240-4:2003(E)
5.5 Battery function check — Optional
The p.s.e. shall include a facility to check the function of the battery.
6 Materials, design and manufacture
6.1 Manufacturer’s declaration
The manufacturer shall declare the following in writing:
a) that the design has been carried out in accordance with a quality management system which incorporates
a set of rules for the design of all elements of the p.s.e.;
b) that the components of the p.s.e. have been selected for the intended purpose and are expected to
operate within their specification when the environmental conditions outside the cabinet of the p.s.e.
comply with Class 3K5 of IEC 60721-3-3.
6.2 Mechanical design
6.2.1 The cabinet of the p.s.e. shall be consistent with the method of installation recommended in the
documentation. It shall meet at least classification IP 30 of IEC 60529.
6.2.2 The p.s.e. may be housed either in a separate cabinet or in cabinets associated with other fire
detection and alarm system equipment.
6.2.3 If the p.s.e. is housed in the c.i.e., then manual controls, fuses, calibration elements etc. for
disconnection and adjustment of the power sources shall be accessible only at Access Level 3 of ISO 7240-2.
6.2.4 If the p.s.e. is not housed in the c.i.e., then manual controls, fuses, calibration elements etc. for
disconnection and adjustment of the power sources shall be accessible only by the use of a tool or key.
6.2.5 All manual controls, fuses, calibration elements and cable terminals shall be clearly labelled (e.g. to
indicate their function, rating or reference to appropriate drawings).
6.2.6 If mandatory indicators required by ISO 7240-2 are repeated on a separately housed p.s.e., then the
indicators shall be in accordance with ISO 7240-2.
6.3 Electrical design
6.3.1 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.
6.3.2 The p.s.e. 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 d.c. circuits from the low voltage a.c.
circuits and for earthing of metal parts.
6.4 Power supply interface
Where the p.s.e. is designed to be used with c.i.e. contained in a remote separate cabinet, then an interface
shall be provided for at least two transmission paths to the c.i.e., such that a short circuit or interruption in one
path does not prevent the supply of power.
© ISO 2003 — All rights reserved 5

---------------------- Page: 10 ----------------------
ISO 7240-4:2003(E)
7 Documentation
7.1 User documentation
The manufacturer shall prepare installation and user documentation which shall be submitted to the testing
authority together with the p.s.e. This shall comprise at least the following:
a) a general description of the p.s.e.;
b) technical specifications of the inputs and outputs of the p.s.e. sufficient to permit an assessment of the
mechanical and electrical compatibility with other components of the system (according to ISO 7240-1),
including
1) power requirements for recommended operation,
2) the maximum and minimum electrical ratings for each input and output,
3) information on the communication parameters employed by the transmission paths,
4) fuse ratings,
5) the types and the maximum and minimum capacities of the batteries suitable for use with the p.s.e.,
and
6) the maximum current drawn from the battery by the p.s.e. when the main power source is
disconnected;
c) installation information, including
1) the suitability for use in various environments,
2) mounting instructions, and
3) instructions for connecting inputs and outputs;
d) commissioning instructions;
e) operating instructions;
f) maintenance information.
7.2 Design documentation
The manufacturer shall prepare design documentation, which shall be submitted to the testing authority
together with the p.s.e. This documentation shall include drawings, parts lists, circuit diagrams, block
diagrams and a functional description such that the compliance with the requirements of this part of ISO 7240
can be checked and that a general assessment of the mechanical and electrical design is possible.
8 Marking
The p.s.e. shall be clearly marked with the following information:
a) the number of this part of ISO 7240 (i.e. ISO 7240-4);
b) the name or trademark of the manufacturer or supplier;
c) the type number or other designation of the p.s.e.;
d) the code or number identifying the productio
...