1、BRITISH STANDARD BS 5446-2:2003 Fire detection and fire alarm devices for dwellings Part 2: Specification for heat alarms ICS 13.220.20 BS 5446-2:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 21 March 2003 BSI 21 March 2003 The followi
2、ng BSI references relate to the work on this British Standard: Committee reference FSH/12/2 Draft for comment 02/540552 DC ISBN 0 580 41344 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee FSH/12, Fire detection and alar
3、m systems, to Subcommittee FSH/12/2, Fire detectors, upon which the following bodies were represented: British Fire Protection Systems Association BRE/LPC Laboratories BSI Testing Product Certification Building Research Establishment Consumer Policy Committee of BSI Department of Health NHS Estates
4、Electricity Association Energy Industries Council London Fire and Emergency Planning Authority Maritime and Coastguard Agency Ministry of Defence UK Defence Standardization National Caravan Council Limited National Inspection Council for Electrical Equipment Office of the Deputy Prime Minister Royal
5、 National Institute for Deaf People Amendments issued since publication Amd. No. Date CommentsBS 5446-2:2003 BSI 21 March 2003 i Contents Page Committees responsible Inside front cover Foreword ii 1S c o p e 1 2 Normative references 1 3T e r m s a n d d e f i n i t i o n s 1 4 Constructional require
6、ments 2 5 Operational requirements 3 6M a r k i n g 8 7 Provision of information 9 Annex A (normative) Test methods 10 Annex B (normative) Test schedule 18 Annex C (normative) Heat tunnel for response time and response temperature measurements 20 Annex D (informative) Information concerning the cons
7、truction of the heat tunnel 20 Annex E (informative) Derivation of upper and lower limits of response times 23 Annex F (informative) Typical apparatus for impact test 25 Annex G (normative) Safety requirements 27 Bibliography 29 Figure A.1 Battery fault warning test circuit 15 Figure D.1 Example of
8、working section of heat tunnel 22 Figure D.2 Example of mounting arrangement for simultaneously testingtwodetectors 22 Figure F.1 Impact apparatus 26 Table 1 Heat alarm classification temperatures 4 Table 2 Response time limits from typical application temperature 4 Table 3 Response time limits from
9、 maximum application temperature 5 Table B.1 Test schedule for resettable heat alarms 19 Table E.1 Thermal constants used to derive upper limits in Table 2 and Table 3 23BS 5446-2:2003 ii BSI 21 March 2003 Foreword This part of BS 5446 has been prepared by Subcommittee FSH/12/2 under the direction o
10、f Technical Committee FSH/12. It is an addition to the BS 5446 series and specifies requirements and test methods for heat alarms intended for use in dwellings. (See BS 5839-6.) The tests are type tests and are not intended as manufacturers tests to maintain uniformity of quality in production, whic
11、h is dealt with in the BS EN ISO 9000 series. While the tests are intended to assess the most important features of the design and construction of heat alarms they cannot remove the necessity for regular inspection and maintenance, which is essential for reliable operation. Product certification. Us
12、ers of this British Standard are advised to consider the desirability of third-party certification of product conformity with this British Standard. Appropriate conformity attestation arrangements are described in the appropriate part of the BS EN ISO 9000 series. Users seeking assistance in identif
13、ying appropriate conformity assessment bodies or schemes may ask BSI to forward their enquiries to the relevant association. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard
14、does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 29 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. BS 5446-2:2003 BS
15、I 21 March 2003 1 1 Scope This part of BS 5446 specifies requirements and type test methods for heat alarms. It is applicable to heat alarms intended solely for permanent installation on ceilings or walls of dwellings, and to heat alarms suitable for use in leisure accommodation vehicles (LAVs). NOT
16、E 1 Equipment conforming to this part of BS 5446 might not be suitable for use in boats due to the corrosive atmosphere. NOTE 2 Although not covered by this part of BS 5446, equipment is available for use with heat alarms in order to provide a suitable warning system for use by the deaf and hearing
17、impaired. NOTE 3 This part of BS 5446 does not include point type detectors. 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 refer
18、enced document (including any amendments) applies. BS 2011 (IEC 60068) (all parts), Environmental testing. BS 4422 (all parts), Glossary of terms associated with fire. BS 5839-6:1995, Fire detection and alarm systems for buildings Part 6: Code of practice for the design and installation of fire dete
19、ction and alarm systems in dwellings. BS EN 54-5, Fire detection and fire alarm systems Part 5: Heat detectors Point detectors. BS EN 60065:2002, Audio, video and similar electronic apparatus Safety requirements. BS EN 60068 (IEC 60068) (all parts), Environmental testing. BS EN 60651, Specification
20、for sound level meters. BS EN 60950-1:2002, Information technology equipment Safety Part 1: General requirements. ISO 209-1:1989, Wrought aluminium and aluminium alloys Chemical composition and forms of products Part 1: Chemical composition. 3 Terms and definitions For the purposes of this part of B
21、S 5446 the terms and definitions given in BS 4422, BS 5839-6, BS EN 54-5 and the following apply. 3.1 alarm condition condition in which a heat alarm is giving a signal as specified by the manufacturer 3.2 application temperatures 3.2.1 maximum application temperature maximum temperature that an ins
22、talled heat alarm can be expected to experience, even for short periods of time, in the absence of a fire condition NOTE This temperature is deemed to be 4 C below the minimum static response temperature for the appropriate class marked on the heat alarm, as specified in Table 1. 3.2.2 typical appli
23、cation temperature temperature that an installed heat alarm can be expected to experience for long periods of time in the absence of a fire condition NOTE This temperature is deemed to be 29 C below the minimum static response temperature for the appropriate class marked on the heat alarm, as specif
24、ied in Table 1. 3.3 fault warning signal intended to indicate an actual or incipient fault that might prevent the emitting of a heat alarm signalBS 5446-2:2003 2 BSI 21 March 2003 3.4 heat alarm device containing within one housing all the components, except possibly the energy source, necessary for
25、 detecting heat and for giving an audible alarm 3.5 normal condition condition in which a heat alarm is energized but is not giving either an alarm signal or a fault warning, although able to give such signals if the occasion arises 3.6 static response temperature temperature at which a heat alarm w
26、ould produce an alarm signal if subjected to a vanishingly small rate of rise of temperature 4 Constructional requirements 4.1 Visual indication of operation Mains-powered apparatus shall include a power supply indicator. This shall be coloured green and shall be continuously illuminated when mains
27、power is present. If an alarm indicator is fitted, it shall be red and shall be separate from the mains power supply indicator. The alarm indicator shall be illuminated when an alarm condition is present. NOTE 1 The fitting of alarm indicators is optional. NOTE 2 It is usual for an alarm indicator t
28、o be continuously illuminated, or flashing at least once per second, when an alarm condition is present. When the failure of an alarm indicator or a power supply indicator is simulated by open circuit or short-circuit, there shall be no failure of the fire alarm signal. NOTE 3 This is to ensure that
29、 the failure of an indicator lamp does not prevent the emitting of a fire alarm signal. 4.2 Terminals for external conductors The alarm or base, as appropriate, if intended to have external connections, shall be provided with terminals for the connection of conductors by means of screws, nuts or equ
30、ally effective devices. Terminals shall allow the connection of conductors having nominal cross-sectional areas of between 0.4 mm 2and 1.5 mm 2 . Terminals shall be designed such that: a) it is not possible to disconnect the conductors, or access the conductors for disconnection, without the use of
31、a tool; b) they clamp the conductor between metal surfaces without rotation of those surfaces but with sufficient contact pressure and without damage to the conductor. 4.3 Alignment of alarms Where separate bases are used, a means to prevent incorrect alignment of the heat alarm in the base shall be
32、 provided. 4.4 Failure of components If a component is fitted that has a mean time before failure of less than 5 years, the heat alarm shall be designed in such a way that a fault warning is given on the failure of that component. Any such warning shall be readily distinguishable from the alarm sign
33、al. NOTE It is usual to fit components that have a mean time before failure of more than 5 years.BS 5446-2:2003 BSI 21 March 2003 3 4.5 Battery removal indication The heat alarm shall be designed in such a way that removal of any user-replaceable battery used to power, or provide back-up power for,
34、the heat detection circuit/sounder, from a battery or mains-powered d.c.-backed heat alarm, results in a visual, mechanical or audible warning that the battery has been removed. The visual warning shall not depend upon a power source. NOTE Conformity may be achieved by, but is not restricted to, one
35、 of the following examples: a) a warning flag that will be exposed with the battery removed and the cover closed; b) a hinged cover or battery compartment that cannot be closed when the battery is removed; c) a unit that cannot be replaced upon its mounting with the battery removed. 4.6 Position of
36、heat-sensitive elements The heat alarm shall be constructed such that at least part of its heat-sensitive element(s), except elements with auxiliary functions (e.g. characteristic correctors), is 15 mm from the mounting surface of the heat alarm. 4.7 Routine testing facility Provision shall be made
37、in the construction of the heat alarm, and in the manufacturers instructions (see Clause 7), for testing by the domestic user. Such testing shall include the whole of the operating system of the heat alarm, including the integrity of the heat-sensing thermistor. NOTE This testing is normally carried
38、 out by the use of a test switch mounted in the heat alarm cover. Failure of the thermistor (e.g. due to physical damage or corrosion of the leads) is critical to the heat alarms operation. 4.8 Battery connections For heat alarms intended for use in LAVs, any leads connecting the terminal connectors
39、 of batteries in heat alarms to the heat alarm circuit board shall be provided with strain-relieving devices adjacent to both battery terminal connectors and the heat alarm circuit board so that when the leads are subjected to a pull of 20 N without jerks for 1 min in any direction allowed by the de
40、sign, the pull is not transmitted to the joints between the leads and the battery terminal connectors or between the leads and the heat alarm circuit board. 4.9 Monitoring of back-up power source NOTE See also 5.24.2. A means shall be provided for monitoring the back-up power source for fault condit
41、ions, including low back-up, open circuit and short-circuit failure. 5 Operational requirements 5.1 General When tested in accordance with the appropriate method specified in Annex A, using the test schedule specified in Annex B, heat alarms shall conform to the requirements specified in 5.3 to 5.20
42、. Heat alarms shall also conform to the requirements specified in 5.21, 5.22, 5.23 and 5.24, as appropriate. Where response times are to be measured, the specimen shall be mounted in a heat tunnel as specified in Annex C. NOTE Further information regarding the construction of the heat tunnel is give
43、n in Annex D. The general procedures specified in A.1 shall be carried out for all tests.BS 5446-2:2003 4 BSI 21 March 2003 5.2 Classification Heat alarms shall conform to class A1, A2 or B, as specified in Table 1. Table 1 Heat alarm classification temperatures 5.3 Directional dependence When teste
44、d in accordance with A.2, class A1 heat alarms shall respond between 1 min 0 s and 4 min 20 s at all eight orientations, and class A2 and B heat alarms shall respond between 2 min 0 s and 5 min 30 s at all eight orientations. 5.4 Static response temperature When tested in accordance with A.3, the re
45、sponse temperatures shall lie between the minimum and maximum static response temperatures specified in Table 1 for the appropriate alarm class. 5.5 Response times from typical application temperature When tested in accordance with A.4, the response times shall lie between the lower and upper respon
46、se time limits specified in Table 2 for the appropriate alarm class. Table 2 Response time limits from typical application temperature 5.6 Response times from 25 C NOTE This requirement is applicable only to class B heat alarms. When tested in accordance with A.5, the response time at 3 C/min shall
47、exceed 7 min 13 s, and the response time at 20 C/min shall exceed 1 min 0 s. 5.7 Response times from high ambient temperature (dry heat operational) When tested in accordance with A.6, no alarm or fault signal shall be given during the period when the temperature is increasing to the stabilization t
48、emperature or during the stabilization period, and the response times shall lie between the lower and upper response time limits specified in Table 3 for the appropriate alarm class. Heat alarm class Typical application temperature Maximum application temperature Minimum static response temperature
49、Maximum static response temperature C C C C A1 25 50 54 65 A2 25 50 54 70 B4 06 56 98 5 Rate of rise of air temperature Class A1 heat alarms Class A2, B heat alarms Lower limit of response time Upper limit of response time Lower limit of response time Upper limit of response time C/min min s min s min s min s 1 29 0 40 20 29 0 46 0 3 7 13 13 40 7 13 16 0 5 4 9 8 20 4 9 10 0 10 1 0 4 20 2 0 5 30 20 30 2 20 1 0 3 13 30 20 1 40 40 2 25 NOT
