ISO 7240-21:2005

Fire detection and alarm systems — Part 21: Routing equipment

ISO 7240-21:2005 specifies requirements, methods of test, and performance criteria for fire-alarm routing (transmitting) equipment and for fault (trouble) warning routing equipment for use in fire detection and fire alarm systems installed in buildings.

Systèmes de détection et d'alarme d'incendie — Partie 21: Équipement de transmission

General Information

• Status: Published
• Publication Date: 03-Jul-2005
• 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: 9093 - International Standard confirmed
• Start Date: 15-Sep-2025
• Completion Date: 20-Sep-2025

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 7240-21
First edition
2005-07-01
Fire detection and alarm systems —
Part 21:
Routing equipment
Systèmes de détection et d'alarme d'incendie —
Partie 21: Équipement de transmission

Reference number
©
ISO 2005
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ii © ISO 2005 – All rights reserved

Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references. 1
3 Definitions. 2
4 General requirements. 3
5 General requirements for indications. 4
6 Quiescent condition. 5
7 Fire alarm condition. 5
8 Supervisory signal condition . 6
9 Fault warning condition . 6
10 Disabled condition. 7
11 Test condition. 8
12 Design requirements. 9
13 Additional design requirements for software-controlled routing equipment. 12
14 Marking. 13
15 Tests. 14
16 Test report. 23
Annex A (informative) Explanation of access levels . 24
Annex B (informative) Design requirements for software-controlled routing equipment . 26

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 7240-21 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 6: Carbon monoxide fire detectors using electro-chemical cells
 Part 7: Point-type smoke detectors using scattered light, transmitted light or ionization
 Part 11: Manual call points
 Part 12: Line type smoke detectors using a transmitting light beam
 Part 13: Compatibility assessment of system components
 Part 14: Guidelines for drafting codes of practice for design, installation and use of fire detection and fire
alarm systems in and around buildings [Technical Report]
 Part 15: Multisensor fire detectors
 Part 21: Routing equipment
 Part 22: Duct sampling equipment
The following part is under preparation:
 Part 9: Test fire for fire detectors [Technical Report]
iv © ISO 2005 – All rights reserved

Introduction
This part of ISO 7240 combines the requirements for both fire-alarm routing (transmitting) equipment
(ISO 7240-1:—, Figure 1, item E) and fault (trouble) warning routing equipment (ISO 7240-1:—, Figure 1,
item J) into a single equipment Standard.
Routing equipment receives signals from control and indicating equipment (ISO 7240-1:—, Figure 1, item B)
and sends fire alarm signals to a fire-alarm receiving station (ISO 7240-1, Figure 1, item F) and fault signals to
a fault warning (trouble signal) receiving station (ISO 7240-1, Figure 1, item K). The receiving stations may be
in the same or different locations.
This part of ISO 7240 describes the mandatory functions which are required to be provided on all routing
equipment covered by this part of ISO 7240, and optional functions with their associated requirements. It is
intended that the options will 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 routing equipment covered by this document with different combinations of functions to conform to this
part of ISO 7240. Routing equipment complying with this part of ISO 7240 will need to fulfil the requirements
of all of the mandatory functions, together with the requirements of those optional functions which are
provided.
INTERNATIONAL STANDARD ISO 7240-21:2005(E)

Fire detection and alarm systems —
Part 21:
Routing equipment
1 Scope
This part of ISO 7240 specifies requirements, methods of test, and performance criteria for fire-alarm routing
(transmitting) equipment (ISO 7240-1:—, Figure 1, item E) and for fault (trouble) warning routing equipment
(ISO 7240-1:—, Figure 1, item J) for use in fire detection and fire alarm systems installed in buildings.
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.
1)
ISO 7240-1:— , Fire detection and alarm systems — Part 1: General and definitions
ISO 7240-4, Fire detection and alarm systems — Part 4: Power supply equipment
IEC 60068-1:1990-05, 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 2-47: Test methods — Mounting of components, equipment
and other articles for vibration, impact and similar dynamic tests
IEC 60068-2-75, Environmental testing — Part 2-75: Tests. Test Eh: Hammer tests
IEC 60068-2-78, Environmental testing — Part 2-78: Tests — Test Cab: Damp heat, steady state
IEC 60529:2001-02, Degrees of protection provided by enclosures (IP Code)
IEC 60721-3-3:2002-10, Classification of environmental conditions — Part 3-3: Classifications of groups of
environmental parameters and their severities — Stationary use and weatherprotected locations
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.
3 Definitions
For the purposes of this document, the definitions given in ISO 7240-1 and the following apply.
3.1
access level
one of several states of a routing equipment in which selected
 controls can be operated;
 manual operations can be carried out;
 indications are visible, and/or;
 information can be obtained.
NOTE See Annex A.
3.2
field
sub-division of a window
3.3
functional condition
condition of the routing equipment characterized by its indication at the routing equipment
NOTE The functional conditions recognized in this part of the ISO 7240 are the following:
 fire alarm condition, when a fire alarm is indicated;
 supervisory signal condition, when a supervisory signal is indicated;
 fault warning condition, when a fault is indicated;
 disabled condition, when the disablement of functions is indicated;
 test condition, when the testing of functions is indicated;
 quiescent condition, when the routing equipment is powered by a power supply conforming to ISO 7240-4 and no
other functional condition is indicated.
3.4
indicator
device which can change its state to give information
3.5
indication
information given by an indicator
3.6
mandatory
〈adjective〉 qualification applied to those functions required to be provided on all routing equipment and the
functions' requirements and to the requirements of any optional functions that have requirements, if such
optional functions are provided
3.7
non-volatile memory
memory elements which do not require the presence of an energy source for the retention of their contents
2 © ISO 2005 – All rights reserved

3.8
point
component connected to a detection circuit enabling the transmission or reception of information in relation to
fire detection
NOTE Includes ISO 7240-1:–, Figure 1, items A and D.
3.9
program
software necessary for routing equipment to comply with at least the requirements of this part of ISO 7240,
including initializing data, reset and interrupt vectors, operating code, and declarations
3.10
reset
operation capable of terminating the fire alarm condition and/or the fault warning condition
3.11
running data
alterable data subject to temporary modification during operation, either automatically or by manual controls
3.12
separate
〈adjective〉 physically separate and exclusively provided for the purpose or purposes stated in this part of
ISO 7240
3.13
silencing
〈noun〉 manual operation for switching off the audible signal of a sounding device that is capable of being
automatically re-sounded by a new event
3.14
transmission path
connection, external to the cabinet of the routing equipment, for the transmission of information and/or power
 between the routing equipment and other components of a fire detection and fire alarm system as defined
in ISO 7240-1, and/or
 between parts of routing equipment contained in different cabinets
3.15
volatile memory
memory elements which require the presence of an energy source for the retention of their contents
3.16
window
part or all of an alphanumeric display used for information relating to one functional condition at a given time
NOTE A sub-division of the display might be realized either by mechanical separation, or under software control.
3.17
zone
geographical sub-division of the protected premises in which one or more points are installed and for which a
common zonal indication is provided
4 General requirements
If functions other than those specified in this part of the ISO 7240 are provided, they shall not jeopardize
compliance with any requirements of this part of the ISO 7240.
If an optional function is include
...