ISO 7240-24:2016
(Main)Fire detection and fire alarm systems — Part 24: Fire alarm loudspeakers
Fire detection and fire alarm systems — Part 24: Fire alarm loudspeakers
ISO 7240-24:2016 specifies requirements, test methods and performance criteria for loudspeakers intended to broadcast a warning of fire between a fire detection and alarm system and the occupants of a building (see ISO 7240‑1:2014, Figure 1, item C). ISO 7240-24:2016 specifies loudspeakers for two types of application environment: type A, generally for indoor use, and type B, generally for outdoor use. ISO 7240-24:2016 does not cover loudspeakers for special applications, for example, loudspeakers for use in hazardous applications, if such applications require additional or other requirements or tests other than those given in this part of ISO 7240. ISO 7240-24:2016 is not intended to cover addressable loudspeakers or loudspeakers with active components. Audible alarm indicators are covered in ISO 7240‑3.
Systèmes de détection d'incendie et d'alarme — Partie 24: Haut-parleurs pour systèmes d'alarme vocale
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 7240-24
Second edition
2016-04-15
Fire detection and fire alarm
systems —
Part 24:
Fire alarm loudspeakers
Systèmes de détection d’incendie et d’alarme —
Partie 24: Haut-parleurs pour systèmes d’alarme vocale
Reference number
ISO 7240-24:2016(E)
©
ISO 2016
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ISO 7240-24:2016(E)
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ii © ISO 2016 – All rights reserved
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ISO 7240-24:2016(E)
Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 2
3.1 Terms and definitions . 2
3.2 Abbreviated terms . 4
4 Requirements . 4
4.1 Compliance . 4
4.2 Frequency response limits . 5
4.3 Durability . 5
4.4 Construction . 5
4.4.1 Provision for external conductors . 5
4.4.2 Materials . 6
4.4.3 Ingress protection . 6
4.4.4 Access . 6
5 Tests . 6
5.1 General . 6
5.1.1 Atmospheric conditions for tests. 6
5.1.2 Operating conditions for tests . 6
5.1.3 Mounting arrangements . 7
5.1.4 Tolerances . 7
5.1.5 Frequency response measurement and sensitivity calculation . 7
5.1.6 Frequency response measurement and sensitivity calculation for
loudspeakers requiring dedicated system equalization . 8
5.1.7 Provision for tests . 8
5.1.8 Test schedule . 9
5.2 Reproducibility .10
5.2.1 Object of the test .10
5.2.2 Test procedure .10
5.2.3 Requirements .10
5.3 Rated impedance .10
5.3.1 Object of the test .10
5.3.2 Test procedure .10
5.3.3 Requirements .11
5.4 Horizontal and vertical coverage angles .11
5.4.1 Object of the test .11
5.4.2 Test procedure .11
5.4.3 Requirements .12
5.5 Maximum sound pressure level .12
5.5.1 Object of the test .12
5.5.2 Test procedure .12
5.5.3 Requirements .13
5.6 Rated noise power (durability) .13
5.6.1 Object of the test .13
5.6.2 Test procedure .13
5.6.3 Requirements .13
5.7 Dry heat (operational) .14
5.7.1 Object of the test .14
5.7.2 Test procedure .14
5.7.3 Requirements .14
5.8 Dry heat (endurance) .14
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ISO 7240-24:2016(E)
5.8.1 Object of the test .14
5.8.2 Test procedure .15
5.8.3 Requirements .15
5.9 Cold (operational) .15
5.9.1 Object of the test .15
5.9.2 Test procedure .15
5.9.3 Requirements .16
5.10 Damp heat, cyclic (operational) .16
5.10.1 Object of the test .16
5.10.2 Test procedure .16
5.10.3 Requirements .17
5.11 Damp heat, steady-state (endurance) .17
5.11.1 Object of the test .17
5.11.2 Test procedure .17
5.11.3 Requirements .18
5.12 Damp heat, cyclic (endurance) .18
5.12.1 Object of the test .18
5.12.2 Test procedure .18
5.12.3 Requirements .18
5.13 Sulfur dioxide (SO ) corrosion (endurance) .18
2
5.13.1 Object of the test .18
5.13.2 Test procedure .19
5.13.3 Requirements .19
5.14 Shock (operational) .19
5.14.1 Object of the test .19
5.14.2 Test procedure .19
5.14.3 Requirements .20
5.15 Impact (operational) .20
5.15.1 Object of the test .20
5.15.2 Test procedure .20
5.15.3 Requirements .21
5.16 Vibration, sinusoidal (operational) .21
5.16.1 Object of the test .21
5.16.2 Test procedure .21
5.16.3 Requirements .22
5.17 Vibration, sinusoidal (endurance) .22
5.17.1 Object of the test .22
5.17.2 Test procedure .23
5.17.3 Requirements .23
5.18 Ingress protection .24
5.18.1 Object of the test .24
5.18.2 Enclosure of the loudspeaker .24
5.18.3 Test procedure .24
5.18.4 Requirements .25
6 Test report .25
7 Marking .25
8 Data .26
Annex A (normative) Acoustical measurements .27
Annex B (normative) Measuring rated noise power (durability) .32
Annex C (informative) Loudspeaker physical references .37
Bibliography .39
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ISO 7240-24:2016(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 meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is 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 7240-24:2010), of which it constitutes a
minor revision.
It also incorporates the Amendment ISO 7240-24:2010/Amd, 1:2013.
ISO 7240 consists of the following parts, under the general title Fire detection and fire alarm systems:
— Part 1: General and definitions
— Part 2: Control and indicating equipment
— Part 3: Audible alarm devices
— 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 8: Point-type fire detectors using a carbon monoxide sensor in combination with a heat sensor
— Part 9: Test fires for fire detectors [Technical Specification]
— Part 10: Point-type flame detectors
— Part 11: Manual call points
— Part 12: Line type smoke detectors using a transmitted optical beam
— Part 13: Compatibility assessment of system components
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ISO 7240-24:2016(E)
— Part 14: Design, installation, commissioning and service of fire detection and fire alarm systems in and
around buildings
— Part 15: Point-type fire detectors using smoke and heat sensors
— Part 16: Sound system control and indicating equipment
— Part 17: Short-circuit isolators
— Part 18: Input/output devices
— Part 19: Design, installation, commissioning and service of sound systems for emergency purposes
— Part 20: Aspirating smoke detectors
— Part 21: Routing equipment
— Part 22: Smoke-detection equipment for ducts
— Part 23: Visual alarm devices
— Part 24: Fire alarm loudspeakers
— Part 25: Components using radio transmission paths
— Part 27: Point-type fire detectors using a scattered-light, transmitted-light or ionization smoke sensor,
an electrochemical-cell carbon-monoxide sensor and a heat sensor
— Part 28: Fire protection control equipment
The following part is under preparation:
— Part 29: Video fire detectors
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ISO 7240-24:2016(E)
Introduction
The purpose of a fire alarm loudspeaker as a component of a fire alarm system (see ISO 7240-19) is to
provide intelligible warning to people in or within the vicinity of a building in which a fire emergency
has occurred and to enable such person(s) to take appropriate measures in accordance with a
predetermined evacuation plan.
The primary reason for using a fire alarm system, instead of coded warnings given by aural alarm
indicators (see ISO 7240-3), is to reduce the time taken for those at risk to recognize that an emergency
exists and to give clear instructions about what to do next. This means that fire alarm loudspeakers are
required to achieve a minimum acoustical performance, as well as constructional and environmental
requirements, to be suitable for use in a fire alarm system.
This part of ISO 7240 recognizes that the exact nature of the acoustical requirements for fire alarm
loudspeakers varies according to the nature of the space into which they are installed. It therefore
specifies the minimum requirements that apply to fire alarm loudspeakers and a common method for
testing their operational performance against parameters specified by the manufacturers.
This part of ISO 7240 gives common requirements for the construction and robustness of fire alarm
loudspeakers as well as their performance under climatic and mechanical conditions that are likely
to occur in the service environment. As the types of loudspeaker considered in this part of ISO 7240
are passive electromechanical devices not involving sensitive electronic circuits, electromagnetic
compatibility (EMC) tests have not been included. The loudspeakers have been classified for either an
indoor or an outdoor application environment category.
This part of ISO 7240 requires that manufacturers specify certain characteristics in a consistent manner
so that designers can make objective decisions about which loudspeaker to use in specific applications.
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INTERNATIONAL STANDARD ISO 7240-24:2016(E)
Fire detection and fire alarm systems —
Part 24:
Fire alarm loudspeakers
1 Scope
This part of ISO 7240 specifies requirements, test methods and performance criteria for loudspeakers
intended to broadcast a warning of fire between a fire detection and alarm system and the occupants of
a building (see ISO 7240-1:2014, Figure 1, item C).
This part of ISO 7240 specifies loudspeakers for two types of application environment: type A, generally
for indoor use, and type B, generally for outdoor use.
This part of ISO 7240 does not cover loudspeakers for special applications, for example, loudspeakers
for use in hazardous applications, if such applications require additional or other requirements or tests
other than those given in this part of ISO 7240.
This part of ISO 7240 is not intended to cover addressable loudspeakers or loudspeakers with active
components.
Audible alarm indicators are covered in ISO 7240-3.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. 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, 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 2-1: Tests — Test A: Cold
IEC 60068-2-2, Environmental testing — Part 2-2: Tests — Test B: Dry heat
IEC 60068-2-6, Environmental testing — Part 2-6: Tests — Test Fc: Vibration (sinusoidal)
IEC 60068-2-27, Environmental testing — Part 2-27: Tests — Test Ea and guidance: Shock
IEC 60068-2-30, Environmental testing — Part 2-30: Tests — Test Db: Damp heat, cyclic (12 h + 12 h cycle)
IEC 60068-2-42, Environmental testing — Part 2-42: Tests — Test Kc: Sulphur dioxide test for contacts and
connections
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 60268-1, Sound system equipment — Part 1: General
IEC 60529:1989, Degrees of protection provided by enclosures (IP code)
IEC 60695-11-10, Fire hazard testing — Part 11-10: Test flames — 50 W horizontal and vertical flame
test methods
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ISO 7240-24:2016(E)
IEC 60695-11-20, Fire hazard testing — Part 11-20: Test flames — 500 W flame test methods
IEC 61260, Electroacoustics — Octave-band and fractional-octave-band filters
IEC 61672-1, Electroacoustics — Sound level meters — Part 1: Specifications
3 Terms, definitions, symbols and abbreviated terms
For the purposes of this document, the terms, definitions and symbols given in ISO 7240-1 and the
following apply.
3.1 Terms and definitions
3.1.1
1/3 octave
frequency band as defined in IEC 61260
3.1.2
coverage angle
smallest angle between two directions on either side of the reference axis at which the sound pressure
level is 6 dB less than the sound pressure level on the reference axis
Note 1 to en
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