BS-4737-4.1-1987.pdf

BRITISH STANDARD BS 4737-4.1: 1987 Incorporating Amendment Nos. 1 and 2 Intruder alarm systems in buildings Part 4: Codes of practice Section 4.1: Code of practice for planning and installation Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:25:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4737-4.1:1987 This British Standard, having been prepared under the direction of the Furniture and Household Equipment Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 January 1987 © BSI 03-2000 ISBN 0 580 15584 6 Committees responsible for this British Standard 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 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 Committee 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 Association 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 National 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. Amendments issued since publication Amd. No.Date of issueComments 7192May 1992 10381March 1999Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:25:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4737-4.1:1987 © BSI 03-2000i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3Planning1 3.1Consultation1 3.2Time schedule1 3.3Survey2 3.4System design3 4Installation5 4.1General5 4.2Detectors6 4.3Control equipment18 4.4Warning devices19 4.5Interconnecting wiring20 4.6Power supply21 4.7Commissioning and handover of the installed system21 Figure 1 Directly attached continuous wiring (configuration I)8 Figure 2 Directly attached continuous wiring (configuration II)8 Figure 3 Use of blockboard9 Figure 4 Use of timber battens10 Figure 5 Recommended configurations for foil12 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:25:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4737-4.1:1987 ii © BSI 03-2000 Foreword This Section of BS 4737 has been prepared under the direction of the Furniture and Household Equipment Standards Committee. The requirements for the installation of intruder alarm systems in buildings were originally published as Sections 1.1 and 2.1 of BS 4737, which were both withdrawn on publication of BS 4737-1. In conjunction with the revision of BS 4737 those aspects of installation not capable of precise specification and recommendations for the planning of an installation are issued in this code of practice. The main 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 published in Parts as follows. Part 1: Specification 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; Section 4.1: Code of practice for planning and installation; Section 4.2: Code of practice for maintenance and records; Part 5: Glossary of terms. In planning an alarm system it should be recognized that no system can guarantee detection of, or immunity from, intruders. The purpose of a system is to confer on the property or persons at risk a level of security that, through careful planning, is in balance with the degree of determination and expertise of the intruder. In making this evaluation, all physical circumstances of the risk need to be assessed, but the degree of security decided upon has to be consistent with a system which is in every sense practical and reliable and which cannot become an unacceptable burden to the general public or police. Furthermore no alarm system, however well planned and installed, can possibly be completely reliable or tamper-proof. The successful operation of an alarm system requires the active cooperation of the subscriber in carrying out the necessary procedures carefully and thoroughly. The usefulness of the whole system can be jeopardized by lack of care or inadequate attention to routine maintenance and servicing. This care has to be extended to the security of keys and of information regarding the system, its installation and method of operation. A British Standard does not purport to include all the necessary 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. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 24, 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 the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:25:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4737-4.1:1987 © BSI 03-20001 1 Scope This Section of BS 4737 gives recommendations for the planning and installation of intruder and/or deliberately-operated alarm systems in buildings. It covers the range of systems specified in BS 4737-1 and BS 4737-2. The recommendations given in this code of practice cover the installation of all systems from basic to the most complex. All recommendations appropriate to a particular installation are applicable. NOTEThe titles of the publications referred to in this Section of BS 4737 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 and BS 4737-2 apply, together with the following. 2.1 commissioning the completion of installation and testing of a system prior to its handover to the subscriber 2.2 environmental protection the protection of equipment against physical damage which might result from exposure to the elements or to the materials and hazards of building operations taking place simultaneously with installation 3 Planning 3.1 Consultation 3.1.1 General. The requirements for an alarm system in a building and for keyholders should be ascertained as accurately as possible by consultation between appropriate interested parties, such as subscribers, architects, consultants, alarm companies, organizations providing central station facilities, the telecommunications company, the local police, insurers, the Health and Safety Executive and any other public authorities concerned. Where means are to be provided for transmission of alarm signals to a police or central station, there should be early consultation and agreement between the interested parties. 3.1.2 Plans and specifications. On the basis of consultation, specifications and, if appropriate, plans should be prepared showing: a) details of the proposed alarm system; b) details of the electrical services; c) the accommodation required for equipment; d) ducts, chases, conduits, etc. required for wiring. Systems should consist of: one or more detectors and/or one or more sensors with associated processors; one or more control equipments; one or more warning devices and/or signalling equipments; the necessary power supply equipment; and, where appropriate, an independent standby battery supply, all of which should be for the sole use of the alarm system. Wiring diagrams should be agreed, in collaboration with those responsible for other services, to enable the necessary ducts, chases, sleeves, etc. to be specified before any building operations commence. The need for segregation of the alarm wiring and equipment should be taken into account at this stage. NOTEAttention is drawn to the “Regulations for Electrical Installations”, 15th Edition, 1981, Institution of Electrical Engineers (IEE)1). 3.1.3 Security of information. It is essential that all documents concerned with the planning and specification of a system should be treated as confidential to the authorized representatives of the parties concerned. The maintenance of security is of paramount importance and steps should be taken to ensure the safe custody of all equipment and documentation pertaining to an installation. A system should be instigated to ensure that the vetting of alarm company employees is effectively carried out, and all such employees should carry identification cards, which should include a photograph of the bearer, the bearers signature, the companys name and address and the date of expiry of the card. 3.2 Time schedule 3.2.1 Preparation. A typical list of events to be taken into consideration, probably but not necessarily in the order stated, in preparing a time schedule is as follows: a) survey of the building or examination of the plans and an assessment of the usage of the building; b) system design for estimating purposes, embracing the requirements and/or recommendations of all interested parties; c) costing procedures; d) submission and consideration of a specification and quotation; e) contacting the telecommunications company regarding the provision of appropriate lines; f) placing of the order for the system; 1) Available from the Institution of Electrical Engineers, Savoy Place, Victoria Embankment, London WC2R 0BL. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:25:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4737-4.1:1987 2 © BSI 03-2000 g) detailing of the planning programme for installation; h) production and delivery; j) installation of the system; k) commissioning and testing of the system by the alarm company; m) consideration and agreement on the action to be taken in the event of activation of the system; n) handover of the system to the subscriber and training in operating procedures; p) connection of any specified remote signalling if unavailable at the time of handover; q) notification of the police and environmental health officer in accordance with local requirements. 3.2.2 Critical path chart. It will be normal practice for all the stages given in 3.2.1 to be included in a critical path chart, for larger installations. Control and indicating equipment for some large installations will almost certainly have to be specially manufactured and the importance of ordering such equipment is emphasized. In buildings under construction or reconstruction, alarm system wiring should be carried out at times and stages of building or decorating work agreed with the main contractor and other contractors. Installation of alarm equipment should be carefully integrated with the operations of other trades to minimize damage from wet building and decorating processes, damp, dust, etc. Temporary environmental protection may be necessary. 3.2.3 Partial operation. Final connection and switching on of the system should be made at a time agreed between the subscriber and the alarm company. There may however be an interim period of partial operation either during partial occupation of the building or to provide security during construction. Such operation is a matter for agreement among interested parties and should be reviewed regularly. NOTEThe subscriber should be instructed to take into account the necessary comings and goings of tradesmen during any period(s) of partial operation during construction. 3.3 Survey 3.3.1 Inspection of premises and contents. The premises to be protected and their contents should be inspected to determine the design requirements of an alarm system that will give adequate detection and warning/signalling capability. The points listed under a) and b) should be considered, together with any police, insurance and any other requirements which are available. a) Premises: 1) construction and layout; 2) occupancy; 3) non-occupancy; 4) keyholding; 5) environment; 6) location; 7) adjacent premises and their occupancy; 8) disposition of occupants; 9) general access to premises; 10) existing security of the building; 11) doors and windows; 12) previous intrusions; 13) fire and health and safety regulations; 14) noise pollution. b) Contents: 1) type; 2) value; 3) bulk; 4) insurance; 5) previous losses; 6) estimates of a single loss; 7) ease of removal; 8) ease of disposal; 9) availability of replacements; 10) effect of loss; 11) disposition of contents. 3.3.2 Environmental and related factors. The existing and potential environmental conditions at the premises should be taken into consideration when planning the type of system to be installed. Whilst protection against mechanical damage, weather, dampness, corrosion, oil and adverse industrial atmospheres is specified in BS 4737-1 and BS 4737-2, there may be other factors to be considered which are only ascertainable by close inspection and/or questioning. Whilst it is impossible to define all such hazards, they fall into two main groups: those present within the area to be protected or immediately adjacent thereto, which come under the control of the subscriber; and those which are beyond the subscribers control but which could affect the stability of the alarm system. Examples of factors that may be under subscriber control are: a) water pipes; b) ventilation fans and loose metal louvre shutters attached thereto; c) suspended signs; d) air conditioning; Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:25:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4737-4.1:1987 © BSI 03-20003 e) lifts; f) fluorescent lighting; g) telephone bells; h) automatic heating systems; j) vermin and birds; k) extraneous noises; m) draughts from ill-fitting doors and windows. Examples of factors usually outside subscriber control are: 1) the effects of road, rail and air traffic; 2) tunnelling under foundations; 3) building construction nearby; 4) premises partly occupied by other parties; 5) adjac