1、BRITISH STANDARD BS 4737-3.1: 1977 Specification for Intruder alarm systems in buildings Section 3.1 Continuous wiring UDC 696.6:654.924.3:621.315.3BS4737-3.1:1977 This British Standard, having been prepared under the direction of the Electronic Equipment Standards Committee, was published under the
2、 authority of the Executive Board on 31 May 1977 BSI 12-1998 First published April 1971 First revision May 1977 The following BSI references relate to the work on this standard: Committee reference EEL/27 Draft for comment 74/25542 DC ISBN:0 580 09673 4 Cooperating organizations The Electronic Equip
3、ment Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: British Broadcasting Corporation British Electrical and Allied Manufacturers Association British Ra
4、dio Equipment Manufacturers Association Cable Television Association of Great Britain Department of Prices and Consumer Protection Electrical, Electronic, Telecommunication and Plumbing Union Electricity Supply Industry in England and Wales Electronic Components Board Electronic Engineering Associat
5、ion * Engineering Equipment Users Association Institution of Electronic and Radio Engineers Post Office * Radio and Electronic Component Manufacturers Federation Scientific Instrument Manufacturers Association The organizations marked with an asterisk in the above list, together with the following,
6、were directly represented on the committee entrusted with the preparation of this British Standard: Association of Burglary Insurance Surveyors Association of Chief Police Officers British Bankers Association British Insurance Association British Railways Board British Security Industry Association
7、Department of the Environment Home Office Independent Burglar Alarm Association Lloyds Syndicates Survey Department Metropolitan Police Ministry of Defence National Supervisory Council for Intruder Alarms Telecommunication Engineering and Manufacturing Association Amendments issued since publication
8、 Amd. No. Date of issue CommentsBS4737-3.1:1977 BSI 12-1998 i Contents Page Cooperating organisations Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Definitions 1 4 Circuit configuration and performance 1 5 Material requirements 1 6 Fixing 1 7 Sensitivity 1 Publications referred to Inside
9、 back coverBS4737-3.1:1977 ii BSI 12-1998 Foreword This revision of BS4737 has been prepared under the authority of the Electronic Equipment Standards Committee in order to reflect the technical advances in the industry since the publication of the 1971edition. It takes account of Amendment SlipNo.1
10、, 1972 (AMD 1064) and of Amendment Slip No.2, 1973 (AMD 1218). It is being published in a number of Sections as follows. Part 1: Requirements for systems with audible signalling only; Section 1.1: Installation; Section 1.2: Maintenance and records Part 2: Requirements for systems with remote signall
11、ing; Section 2.1: Installation; Section 2.2: Maintenance and records; Part 3: Requirements for detection devices, consisting of a number of separate Sections (3.1, 3.2, 3.3 etc.). The specifications for detection devices (including this Section of BS4737) are to be read in conjunction with Section1.
12、1 or Section2.1 (as appropriate). 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
13、 of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 and 2, 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
14、 cover. BS4737-3.1:1977 BSI 12-1998 1 1 Scope This British Standard specifies requirements for continuous wiring used as a detection device in intruder alarm systems in buildings. 2 References The titles of the standards publications referred to in this standard are given on the inside back cover. 3
15、 Definitions For the purposes of this British Standard, the following definition applies in addition to those given inBS4737-2.1. 3.1 continuous wiring a detection device, consisting of taut wires, designed to generate an alarm condition when the wiring is broken 4 Circuit configuration and performa
16、nce Continuous wiring shall be in the form of a double-pole circuit. It shall either be designed to generate an alarm condition when adjacent wires are short-circuited, or it shall be designed to generate an alarm condition when alternate wires are short-circuited. It is permissible for these two de
17、signs to be used in association. An alarm condition shall be generated when any wire is open-circuited. 5 Material requirements Each wire shall consist of a hard drawn copper conductor having a nominal diameter not less than0.3mm and not more than0.4mm, or other conductor of equivalent mechanical st
18、rength, covered with PVC insulation complying with the requirements of BS6746 and having a radial thickness not less than0.2mm and not more than0.3mm, or other suitable insulation of equivalent mechanical properties. 6 Fixing 6.1 Directly-attached continuous wiring. Where continuous wiring is direct
19、ly attached to the surface to be protected, it shall be fixed as tautly as practicable. Each wire shall be fixed at intervals not exceeding 600mm, by means of corrosion-resisting staples to timber or other material which adequately retains the staples. An alternative method of fixing may be used, pr
20、ovided it offers at least equivalent mechanical strength. The method of fixing shall not normally be visible from the reverse side of the material to which the wiring is attached. The spacing between adjacent wires shall not exceed 100mm. The wiring shall be protected from damage due to rough surfac
21、es, projections and rough edges. Where it would otherwise be liable to mechanical damage, it shall be covered with hardboard or other suitable protective material. Where two layers of continuous wiring are used, each layer shall meet the requirements of this British Standard, the conductors in the t
22、wo layers shall be approximately at right angles and the fixings shall be far enough from the crossing points to avoid mechanical damage. NOTESuch a double layer of continuous wiring is commonly called transverse wiring. 6.2 Continuous wiring in tubes or in grooved rods. Where continuous wiring is i
23、n tubes or in grooved rods, it shall be fixed as tautly as practicable. Each tube or rod shall be not more than1m long, and the spacing between adjacent tubes or rods shall not exceed 100mm between centres. The tubes or rods shall be of rigid material and shall be recessed into supports by not less
24、than5mm and not more than 10mm at each end. Each wire shall be fixed not more than 50mm from the end of the tube or rod, by means of corrosion-resisting staples, to supports of timber or other material which adequately retains the staples. An alternative method of fixing may be used, provided it off
25、ers at least equivalent mechanical strength. 7 Sensitivity It shall not be possible to move the wiring support more than 50mm from its normal position without generating an alarm condition.2 blankBS4737-3.1:1977 BSI 12-1998 Standards publications referred to BS 4737, Specification for intruder alarm
26、 systems in buildings. BS 4737-1, Requirements for systems with audible signalling only. BS 4737-1.1, Installation. BS 4737-2, Requirements for systems with remote signalling. BS 4737-2.1, Installation. BS 6746, PVC insulation and sheath of electrical cables.BSI 389 Chiswick High Road London W4 4AL
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