1、BRITISH STANDARD BS 4737-3.0: 1988 Intruder alarm systems Part 3: Specifications for components Section 3.0 General requirements UDC 696.6:654.924.3:621.351:.001.2.23+.004.15BS4737-3.0:1988 This British Standard, having been prepared under the directionof the Furniture andHousehold Equipment Standar
2、ds Committee, was published under the authority ofthe Board of BSI and comes intoeffect on 30 June 1988 BSI 12-1998 The following BSI references relate to the work on this standard: Committee reference FHM/45 Draft for comment 86/40943 DC ISBN 0 580 16636 8 Committees responsible for this British St
3、andard The preparation of this British Standard was entrusted by the Furniture and Household Equipment Standards Committee (FHM/-) to Technical Committee FHM/45, upon which the following bodies were represented: Association for Payment Clearing Services Association of British Insurers Association of
4、 Burglary Insurance Surveyors Association of Chief Police Officers of England and Wales Association of Metropolitan Authorities British Retailers Association British Security Industry Association British Telecommunications plc Construction Security Advisory Service Consumer Standards Advisory Commit
5、tee of BSI Department of the Environment (Property Services Agency) Electrical Contractors Association Electrical Contractors Association of Scotland Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Electricity Supply Industry in England and Wales Electronic Engineering Assoc
6、iation Home Office Home Office Crime Prevention Centre Inspectors Approved Alarm Installers Institution of Electrical and Electronics Incorporated Engineers Lloyds Syndicates Survey Department Metropolitan Police Ministry of Defence National Association of Goldsmiths of Great Britain and Ireland Nat
7、ional Supervisory Council for Intruder Alarms Limited Post Office Royal Institute of British Architects Telecommunication Engineering and Manufacturing Association (TEMA) Tobacco Advisory Council Wine and Spirit Security Liaison Ltd. The following bodies were also represented in the drafting of the
8、standard, through subcommittees and panels: British Cable Makers Confederation Fire Insurers Research and Testing Organisation (FIRTU) Loss Prevention Council Amendments issued since publication Amd. No. Date of issue CommentsBS4737-3.0:1988 BSI 12-1998 i Contents Page Committees responsible Inside
9、front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Construction and performance 1 4 Product specification 2 Appendix A Environmental test procedures 3 Publications referred to Inside back coverBS4737-3.0:1988 ii BSI 12-1998 Foreword This Section of BS 4737 has been prepared under the direction of t
10、he Furniture and Household Equipment Standards Committee to reflect technical advances since the publication of the previous edition of Part 3 and to provide requirements for the component parts of an intruder alarm system in a suitable form to allow the third party certification of such components
11、to be undertaken. The overall objectives of BS 4737 are to maximize the effectiveness of intruder alarm systems in respect of the detection and signalling of unauthorized intrusions and to minimize the incidence of false alarms. BS 4737 is being revised and issued in Parts as follows. Part 1: Specif
12、ication for installed systems with local audible and/or remote signalling; Part 2: Specification for installed systems for deliberate operation; Part 3: Specifications for components (incorporating a revision of the existing Sections 3.1 to 3.14 of BS 4737); Part 4: Codes of practice; Part 5: Terms
13、and symbols. The objective of this Section of the revised BS 4737 is to specify general requirements for the satisfactory performance and compatibility of components of an intruder alarm system. Product certification. Users of British Standards for intruder alarm components are advised to consider t
14、he desirability of third party certification of product conformity with the British Standard based on testing and continuing surveillance, which may be coupled with assessment of a suppliers quality systems against the appropriate Part of BS 5750. Enquiries as to the availability of third party cert
15、ification schemes will be forwarded by BSI to the Association of Certification Bodies. If a third party certification scheme does not already exist, users should consider approaching an appropriate body from the list of Association members. A British Standard does not purport to include all the nece
16、ssary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. In particular attention is drawn to the possible existence of Regulations concerning the operating f
17、requency and power level of any radiation emanating from a component of an intruder alarm system. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and
18、 may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.BS4737-3.0:1988 BSI 12-1998 1 1 Scope This Section of BS 4737 specifies general performance requirements for components for use in intruder alarm systems. This Section should be read in conj
19、unction with the appropriate Section ofBS4737-3 1)for the particular component considered. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this Section of BS 4737 the definitions given in BS 4737-1 apply. 3 Constr
20、uction and performance 3.1 General All terminals and leads for external connection shall be identifiable. Where a component is fitted with a test facility it shall be possible to inhibit the appearance of any associated indication. NOTEAdditional features may be incorporated into a component provide
21、d that the construction and performance requirements comply with this Section of BS 4737. 3.2 Housing NOTE 1Where appropriate the housing of a component should provide for the accommodation of a communications module. The housing of a component shall comply with the requirements for a degree of prot
22、ection to class IP 41 or, if intended for exterior applications, to class IP65 of BS 5490:1977 and shall continue to do so following an impact of energy 1 Nm applied to any accessible point on its external surface, other than a lamp or lens, by means of the impact test apparatus specified in 21.1 of
23、 BS 3456-101:1987. NOTE 2Impacts may be applied to lamps or lenses projecting beyond the plane of any surface of a component for the purpose of determining their vulnerability in service. NOTE 3Components having necessary apertures will be exempt from the IP requirements at these points. Necessary a
24、pertures include, but are not limited to, mounting and fixing holes, cable entry points and the area(s) in front of certain sensing elements. Means shall be provided to permit a component housing to be mounted as indicated in its product specification (see item c) of clause4). When mounted by this m
25、eans to a sound surface, the impact test described above shall not result in any dislodgement from the mounting or change in orientation of the component. 3.3 Tamper detection Tamper detection shall be fitted to a component housing and shall generate an alarm condition before the cover or any normal
26、 access panel is opened sufficiently to permit adjustment of the performance or of any means for alignment of the component, and before access can be gained to any circuit connection. It shall not be possible to overcome tamper detection by the use of normally available tools such as knives or screw
27、drivers without consequent damage to the component housing. 3.4 Operating voltage A component shall require a nominal voltage of12Vd.c. for operation or, where this is impracticable, a voltage not exceeding 50 V (seeitem b) of clause4). NOTEA component should comply with the requirements of this Sec
28、tion of BS 4737 over the entire voltage range between+25% and 20% of the quoted voltage(s) and should conform to the appropriate electrical safety recommendations ofBS2754 for equipment of its nominal voltage. An alarm or fault output shall be generated before the power supplied to a component is in
29、sufficient for its performance characteristics (see item a) of clause4) to be met. 3.5 Adjustment If a control is fitted for adjustment of a component it shall have identified positions which shall include the maximum and the minimum selectable values. If a preset adjustment is included to set at th
30、e maximum value, the adjustment, once made, shall not be readily alterable. The control and/or preset adjustments shall only be accessible by removal of the normal access panel. 3.6 Environmental conditions When tested as described in appendix A, a component, functioning in its normal operating mode
31、 shall continue to comply with the requirement for basic operation given in the relevant Section ofBS4737-3 following exposure to each of the following environmental conditions. NOTEIf the component under evaluation is not covered by a Section of BS 4737-3, the manufacturers product specification (s
32、ee clause4) should be consulted for a suitable basic operational requirement. a) A temperature of 55 C for 16 h (see A.2). b) A temperature of 10 C for 16 h (see A.3). c) A sinusoidal vibration of 0.1 g nover the frequency range 10 Hz to 55 Hz (see A.4). 1) This applies to Sections of BS 4737-3 publ
33、ished from 1988 onwards.BS4737-3.0:1988 2 BSI 12-1998 d) Voltages of nominal +25 % and nominal 20 % (see A.5). Where the product specification quotes a voltage range (see item b) of clause 4) the test voltages shall be the arithmetic mean of the quoted voltage range, the maximum quoted voltage +25 %
34、 and the minimum quoted voltage 20%. e) An electrical pulse of amplitude 500 V (seeA.6). f) An electrostatic discharge of 1.2 mJ from a 4 kV source (see A.7). g) Electromagnetic fields of 10 V/m in the frequency range 0.1 MHz to 150 MHz and 5 V/m in the frequency range 150 MHz to 500 MHz (seeA.8). N
35、o alarm condition shall occur during exposure to the specified environmental conditions. 4 Product specification A component for an intruder alarm system shall be accompanied by a manufacturers product specification giving the following information: a) performance characteristics and input/output ra
36、tings; b) electrical supply requirements in respect of voltage, current and frequency; c) wiring and mounting instructions; d) instructions for adjustment, including the specification for any special tool(s) required.BS4737-3.0:1988 BSI 12-1998 3 Appendix A Environmental test procedures A.1 General
37、Unless otherwise stated in the relevant Section ofBS4737-3 for a particular component, environmental test procedures are carried out as described in A.2 to A.8. During the application of the specified environment, any separate parts of the component, such as sensors and processors, are connected by
38、the maximum specified length of connecting lead or10m, whichever is the shorter, which should not be coiled. Prior to exposure to the test environment, set up the component in its normal operating mode at a temperature between 15 C and 35 C and at a relative humidity between 45 % and 75 %. Carry out
39、 the necessary basic operational test to verify compliance with the appropriate requirement of the relevant Section of BS 4737-3 with the component operating from power supplied at its nominal or mid-range voltage (see item b) of clause4). Subject the normally operating component to each of the envi
40、ronmental conditions of A.2 to A.8 in that sequence, and report the generation of any alarm condition during exposure to the test environment. Immediately following exposure to each of A.2, A.3, A.4, A.5 and A.6 to A.8 return the component to ambient conditions within 5 C and 10 % r.h. of those used
41、 above (but remaining within the specified range) and repeat the basic operational test to verify continued compliance with the requirement of the relevant Section of BS 4737-3. NOTEIf required, further details of some of the environmental test procedures can be found in BS 2011 or BS 6667 (see the
42、appropriate reference given in A.2 to A.8). A.2 Dry heat test Raise the temperature of the immediate surroundings of the component to 55 2 C at a rate of not more than 1 C/min and maintain at this temperature for 16 h. (See test Bb of BS 2011-2.1B.) A.3 Cold test Lower the temperature of the immedia
43、te surroundings of the component to 10 3 C at a rate of not more than 1 C/min and maintain at this temperature for 16 h. (See test Ab of BS 2011-2.1A.) A.4 Sinusoidal vibration test Mount the component on a rigid fixture so that gravitational force acts in the direction it would in normal use or, wh
44、ere the gravitational force is not important, in any attitude and subject it to a sinusoidal vibration of 0.1 g n(0.981 m/s 2 ) in the frequency range 10 Hz to 55 Hz swept at 1 octave/min for 10 1 min. Repeat the test for each of the remaining perpendicular axes of the component. (SeeBS2011-2.1Fc.)
45、A.5 Voltage fluctuation test Raise the voltage supplied to the component to 25 % above the nominal or maximum voltage (see item b) of clause4) and carry out the basic operational test for the component at this voltage. Reduce the voltage supplied to the component to20% below the nominal or minimum v
46、oltage (seeitem b) of clause4) and carry out the basic operational test for the component at this voltage. A.6 Electrical pulse test Subject the component 10 times to a positive-going voltage pulse of 500V from a source impedance of50W, the pulse having a double-exponential envelope, a rise time of
47、10 ns and a fall time between100ns and 1 s. The pulse is applied: a) between each pair of terminals for input, output and tamper detection (this represents “differential mode interference”); and b) between each pair of terminals as in a), connected together, and the earth terminal of the component (
48、this represents “common mode interference”). A component without an earth terminal should be placed on an earthed metal plate, extending at least0.1 m beyond the component in each direction and the voltage pulse applied between the connected pairs of terminals and the plate. Repeat the whole test wi
49、th 10 negative-going pulses.BS4737-3.0:1988 4 BSI 12-1998 A.7 Electrostatic discharge test Subject the operating component to 10 discharges from a capacitor of 150 pF, previously charged to4kV by a suitable d.c. supply, connected to the component through its earth terminal and via a150W resistor to any surface which is normally accessible in operation of the component. Components without an earth terminal should be tested on an earthed metal plate which projects beyond the component by at least 0.1 m on every side; the earth
