1、BRITISH STANDARD BS 4737-4.3: 1988 Intruder alarm systems Part 4: Codes of practice Section 4.3 Code of practice for exterior alarm systems UDC 696.6:654.924.3:006.76:(083.71):005.002.5BS4737-4.3:1988 This British Standard, having been prepared under the direction of the Furniture and Household Equi
2、pment Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 30December1988. BSI 12-1998 The following BSI references relate to the work on this standard: Committee reference FHM/45 Draft for comment 88/36848 DC ISBN 0 580 17040 3 Committees respon
3、sible for this British Standard The preparation of this British Standard was entrusted by the Furniture and Household Equipment Standards Policy Committee (FHM/) to Technical Committee FHM/45, upon which the following bodies were represented: Association for Payment Clearing Services 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 Policy Committee of BSI De
5、partment 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 Association Home O
6、ffice Home Office Crime Prevention Centre Independent Associated Alarm Installers Ltd. Institution of Electrical and Electronics Incorporated Engineers Lloyds Syndicates Survey Department Loss Prevention Council Metropolitan Police Ministry of Defence National Association of Goldsmiths of Great Brit
7、ain and Ireland National Supervisory Council for Intruder Alarms Post Office Royal Institute of British Architects Telecommunication Engineering and Manufacturing Association Tobacco Advisory Council Wine and Spirit Security Liaison Ltd. Amendments issued since publication Amd. No. Date of issue Com
8、mentsBS4737-4.3:1988 BSI 12-1998 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Planning 1 4 Equipment 1 5 Installation 3 6 Commissioning and handover 6 Publications referred to Inside back coverBS4737-4.3:1988 ii BSI 12-1998 Foreword This Section o
9、f BS4737 has been prepared under the direction of the Furniture and Household Equipment Standards Policy Committee to provide recommendations for those intruder alarm systems in which a majority of the components of an installed system are sited in exposed or open areas or in the surroundings of a b
10、uilding. The systems considered are those providing security comparable to BS4737-1. Notwithstanding its title and scope, many of the basic requirements of BS4737-1 are applicable to exterior systems and, where relevant, are referred to in this document. The main objectives of BS4737 are to maximize
11、 the effectiveness of intruder alarm systems, in respect of the detection and signalling of unauthorized intrusions, and to minimize the incidence of false alarms. BS4737 is being revised and published in Parts as follows. Part 1: Specification for installed systems with local audible and/or remote
12、signalling; Part 2: Specification for installed systems for deliberate operation; Part 3: Specification for components (incorporating a revision of the existing; Sections3.1 to 3.14 of BS4737). Part 4: Codes of practice; Section 4.1: Code of practice for planning and installation; Section 4.2: Code
13、of practice for maintenance and records; Section 4.3: Code of practice for exterior alarm systems. Part 5: Terms and symbols; Section 5.1: Glossary of terms; Section 5.2: Recommendations for symbols for diagrams. BS4737 does not give any requirements for the degree of protection and a prospective cu
14、stomer should give careful consideration to the extent and degree of protection required, having regard to the nature of the site to be protected, the value of its contents and the prevailing circumstances. It should be recognized that comprehensive protection necessarily entails substantial expense
15、, but no intruder alarm system can possibly detect all forms of unauthorized entry or be completely tamper-proof. The successful operation of an installed intruder alarm system requires the active cooperation of the customer in carrying out the necessary procedures carefully and thoroughly. The usef
16、ulness of the whole system and its social acceptability can be jeopardized by lack of care. This care has to extend to the security both of keys and of information regarding the system, its design, installation and method of operation and to ensuring adequate maintenance, to preserve the protection
17、against criminal activity and to reduce the incidence of false alarms. In particular, a high level of site discipline and maintenance is considered to be a vital aspect in the minimizing of false alarms from exterior alarm systems. A British Standard does not purport to include all the necessary pro
18、visions of a contract. Users of British Standards are responsible for their correct application.BS4737-4.3:1988 BSI 12-1998 iii Compliance with a British Standard does not of itself confer immunity from legal obligations. In particular, systems utilizing electromagnetic radiation for detection or tr
19、ansmission may require approval by the Department of Trade and Industry (Radiocommunications Division), and the requirements of police force policies with respect to exterior intruder alarm system installations may differ significantly from those for systems installed in premises. Summary of pages T
20、his document comprises a front cover, an inside front cover, pages i to iv, pages1to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.iv blank
21、BS4737-4.3:1988 BSI 12-1998 1 1 Scope This Section of BS4737 gives recommendations for the planning, equipment and installation of intruder alarm systems in situations where the balance of the system is located exterior to any premises. The recommendations given in this code of practice cover all sy
22、stems from the basic to the most complex and all recommendations appropriate to a particular installation are applicable. NOTEThe titles of the publications referred to in this Section of BS4737 are listed on the inside back cover. 2 Definitions For the purposes of this Section of BS4737, the defini
23、tions given in BS4737-1 apply, together with the following. 2.1 exterior alarm system an intruder alarm system providing protection principally to open areas or to the surroundings of a building NOTETypically, these systems are used to protect such areas as vehicle compounds, container depots, build
24、ing sites and perimeter areas. 2.2 protected site the area to which protection is afforded by an exterior alarm system 3 Planning 3.1 General The planning of an exterior alarm system should follow the recommendations given in clause3 of BS4737-4.1:1987, wherever these are relevant. 3.2 Environment T
25、he existing and potential environmental conditions at the protected site should be taken into consideration when planning the type of system to be installed. It is not possible to identify all of the factors to be considered but the following represent examples known to cause problems with exterior
26、alarm systems: a) extreme temperatures; b) weather conditions such as rain, hail, snow, wind, fog, lightning and solar radiation; c) undergrowth and foliage; d) wildlife and domestic animals; e) site topography, ground structure and local vibration, including surface and/or buried services; f) lack
27、of site controls, such as those on the parking of vehicles, and lack of control over site openings; g) immediate or adjacent storage of hazardous materials, e.g. liquefied petroleum gas (LPG) or petroleum spirit; h) adjacent structures facilitating avoidance of detection, e.g. by enabling the jumpin
28、g-over of a barrier-mounted detector; i) radiation from overhead or buried power cables or other potential sources of radio frequency interference. Many of these factors are likely to be seasonal and may not be present when the site is initially surveyed. Those factors which are within the control o
29、f the customer should be the subject of advice on site discipline and maintenance to be given to the customer on handover see6.4m). 3.3 Public access There should be at least one soundly constructed and secure barrier (see for example BS1722-10) or other form of effective control, e.g. manned patrol
30、s, restricting access to any exposed protected site. If a barrier-mounted detector is likely to respond to the close approach of a person from any adjacent area to which legitimate public access is allowed, a second barrier should be provided at sufficient distance from the detector to minimize any
31、such response. 4 Equipment 4.1 General An exterior alarm should incorporate all of the system requirements specified in clause3 of BS4737-1:1986. Any components of an exterior alarm system which are located within premises on the protected site should comply with the relevant equipment requirements
32、of BS4737-1:1986. All externally located components should be in securely mounted and appropriately weather-proof housings, incorporating tamper detection as required by 3.2.1 of BS4737-1:1986, and should be capable of satisfactory operation at ambient temperatures from 20C to 40C. Exposure to direc
33、t sunlight may produce temperatures in excess of 40 and appropriate shielding should be provided in such circumstances. Additionally, components exposed to wind will be subject to a chill factor and in exposed locations any necessary insulation should be provided. Consideration should be given to th
34、e selection of self-checking components to facilitate maintenance and to reduce the incidence of false alarms.BS4737-4.3:1988 2 BSI 12-1998 4.2 Detectors Detectors in an exterior alarm system may be of two types: a) those providing, or which are carried upon, a physical barrier; and b) those providi
35、ng no apparent barrier or which run alongside, but separately from, a physical barrier. For type a), suitable detection principles for exterior alarm systems include: 1) point shock; 2) linear shock or flex-sensitive; 3) microphonic; 4) electrostatic; 5) electromagnetic; 6) fibre optics; 7) tensione
36、d wire (operating switches or strain gauges); 8) protective switches. For type b) suitable detection principles for exterior alarm systems include: i) beam interruption (infra-red); ii) microwave (barrier and doppler effect); iii) buried microphonic; iv) differential pressure sensing; v) buried line
37、 field disturbance; vi) free standing electrostatic or electromagnetic; vii) displacement (“seismic”); viii) metal detection (inductive); ix) video motion; x) passive infra-red. Verification techniques should be used wherever possible to ensure that false alarms are not created by the inadvertent op
38、eration of a detector. Appropriate techniques include the use of combined detection principles such as overlaid barrier and field detectors or remote television surveillance triggered by a detector. Other than in exceptional circumstances, a single activation of one detector should always be subject
39、 to verification before signalling is initiated. 4.3 Control equipment Control equipment should be located within the protected site and preferably in a secure building. Control equipment and processors located in a building should comply with clause6 of BS4737-1:1986. Control equipment and processo
40、rs not located in a building should be in a lockable enclosure constructed of material complying with 3.2.1 of BS4737-1:1986, with a degree of protection of IP65 in accordance with BS5490. The enclosure should include tamper detection complying with 3.2.2 of BS4737-1:1986. 4.4 Power supply equipment
41、 Power supply equipment located in a building should comply with clause7 of BS4737-1:1986. All components of an exterior alarm system should have a standby source of power sufficient for not less than 8hours normal operation supplied either from the control equipment or integral with the component;
42、remote signalling systems should signal any failure of the output from a power supply. Power supply equipment not located in a building should be in a lockable enclosure constructed from material complying with 3.2.1 of BS4737-1:1986 with a degree of protection of IP65 in accordance with BS5490. The
43、 enclosure should include tamper detection complying with 3.2.2 of BS4737-1:1986. 4.5 Warning devices and signalling equipment The requirements for warning and/or signalling in an exterior alarm system are dependent upon whether the protected site is manned. For unmanned sites external audible warni
44、ng devices and/or remote signalling should be used. Audible warning devices should comply with 8.2 ofBS4737-1:1986, except that the mean sound level should not be less than 85dB(A) at 1m and the standby power source should not be a primary battery. At least one audible warning device, dependent upon
45、 site conditions, should be located externally not less than 3m from the ground on a suitable building or on a free-standing rigid pole or post. Remote signalling equipment should comply with clause9 of BS4737-1:1986, and should be operated in accordance with the relevant police force policy and any
46、 telecommunications company requirements. Remote signalling communications lines should be routed underground. Signalling equipment may signal either to a remote central station or to a local console as part of a customers own central station facility. The construction, facilities and operation of t
47、he remote central station should comply with BS5979.BS4737-4.3:1988 BSI 12-1998 3 4.6 Interconnection Cables used for interconnecting wiring within a building should comply with BS4737-3.30. Cables used for interconnection externally should be heavy-duty PVC-sheathed, with ultraviolet protection if
48、exposed, or should be mechanically protected, e.g. by the use of mineral-insulated copper sheathed cable. Wire-free links used for interconnection should provide the features recommended for a classV system in accordance with 3.6 of BS6799:1986. Mains wiring communication should provide the features
49、 recommended for a class3 system to 3.4 ofBS 1) 4.7 Operational requirements The operational requirements for an exterior alarm system giving local audible warning only should be as specified in clause4 of BS4737-1:1986. The operational requirements for an exterior alarm system with remote signalling should be as specified in clause5 of BS4737-1:1986, except that there need not be any audible indication given during setting and unsetting procedures and, following activation, audible warning devices may be reset automatically by the control equ
