1、BRITISH STANDARD BS 4737-3.3: 1977 Specification for Intruder alarm systems in buildings Part 3: Requirements for detection devices Section 3.3 Protective switches UDC 696.6:654.924.3:621.316.54BS 4737-3.3:1977 This British Standard, having been prepared under the direction of the Electronic Equipme
2、nt Standards Committee, was published under the 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 74/25542DC ISBN 0 580 09683 1
3、 Cooperating organizations The Electronic Equipment 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 a
4、nd Allied Manufacturers Association British Radio 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 Co
5、mponents Board Electronic Engineering Association 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
6、 above list together with the following, 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 Boa
7、rd British Security Industry Association 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 Associ
8、ation Amendments issued since publication Amd. No. Date of issue CommentsBS4737-3.3:1997 BSI 12-1998 i Contents Page Cooperating organizations Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Definitions 1 4 Circuit configuration 1 5 Performance 1 6 Environment 1 Standards publications refe
9、rred to Inside back coverBS4737-3.3:1997 ii BSI 12-1998 Foreword This revision of BS 4737 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 1971 edition. It takes account of Am
10、endment Slip No.1, 1972 (AMD1064) and of Amendment Slip No.2, 1973 (AMD1218). 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 wi
11、th remote signalling; 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 conjuncti
12、on with Section1.1 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 obl
13、igations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 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 o
14、n theinside front cover.BS 4737-3.3:1977 BSI 12-1998 1 1 Scope This British Standard specifies the general requirements for protective switches to be used in intruder alarm systems in buildings. 2 References The titles of the standards publications referred to in this standard are given on page 2. 3
15、 Definitions For the purposes of this British Standard, the following definition applies in addition to those given in BS4737-2.1. 3.1 protective switch a detection device, associated with a moveable part (such as a door or window) designed to generate an alarm condition when the moveable part is op
16、ened 4 Circuit configuration Each protective switch shall be either a closed-circuit device, or an open-circuit device to which all connections are within the closed circuit and within the same enclosure. In open-circuit protective switches the contacts shall be hermetically sealed. A closed-circuit
17、 protective switch may include, as an additional feature, open-circuit contacts. When installed, it shall not be possible visually to determine the connection of the wiring inside the device from the orientation or otherwise of the wiring to the device. 5 Performance Each protective switch shall ope
18、rate in such a manner that an alarm condition shall be generated when the moveable part is opened in the normal manner prior to the appearance of a clear opening100mm wide. 6 Environment The requirements of this British Standard shall be met by the detector under any combination of the following env
19、ironmental conditions. Temperature: 10C to + 40 C Relative humidity: 10 % to 95 %2 blankBS 4737-3.3:1977 BSI 12-1998 Standards publications referred to BS 4737, Specification for intruder alarm systems in buildings. BS 4737-1, Requirements for systems with audible signalling only. BS 4737-1.1, Insta
20、llation. BS 4737-2, Requirements for systems with remote signalling. BS 4737-2.1, Installation.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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