BRITISH STANDARD Intruder alarm systems in buildings — Part 3: Specifications for components — Section 3.30 Specification for PVC insulated cables for interconnecting wiring UDC 696.6:654.924.3:621.3-51:621.315.33;678.743.22 BS 4737-3.30: 1986 BS 4737-3.30:1986 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: 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 June 1986 © BSI 12-1998 The following BSI references relate to the work on this standard: Committee reference FHM/45 Draft for comment 85/37997 DC ISBN 580 15233 Association for Payment Clearing Services Association of British Insurers Association of Burglary Insurance Surveyors Association of Chief Police Officers of England and Wales British Railways Board 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 issue Comments BS 4737-3.30:1986 Contents Committees responsible Foreword Scope Definitions Materials and construction Marking and packaging Publications referred to Page Inside front cover ii 1 Inside back cover ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ © BSI 12-1998 i BS 4737-3.30:1986 Foreword This Section of BS 4737 has been prepared under the direction of the Furniture and Household Equipment Standards Committee to reflect technical advances since the publication of the previous edition of Part 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; — Part 5: Glossary of terms The objective of this Section of the revised BS 4737 is to specify requirements for cables for interconnecting wiring which will ensure that they perform satisfactorily, minimize false alarms and are compatible with other parts of an intruder alarm system This Section of BS 4737 is not intended to specify new requirements for cables but, in view of the diversity of existing standards, to define those cables which have proved satisfactory for use in intruder alarm systems Cables should be selected according to the power requirements of interconnected components and to their environment The cables specified in this standard are for use in typical intruder alarm installations, in normally encountered environments; other types of cable and/or insulation may be appropriate in atypical situations In compiling the necessary definitions note has been taken of BS 4727 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 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 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 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 cover ii © BSI 12-1998 BS 4737-3.30:1986 Scope This Section of BS 4737 specifies material and construction requirements for PVC insulated cables for use as interconnecting wiring in intruder alarm systems in buildings The cables specified are not for use in locations open to the weather without additional protection No requirements are specified with regard to the colour coding of intruder alarm cables 2.7 sheathing a uniform and continuous covering of material giving mechanical protection and/or additional insulation to a core or cores in a cable 2.8 tubed sheathing sheathing which does not follow closely the contours of the core(s) NOTE The titles of the publications referred to in this standard are listed on the inside back cover 2.9 filled sheathing Definitions sheathing which also fills the interstices between cores, closely following their contours For the purposes of this Section of BS 4737 the definitions given in BS 4737-1 apply together with the following one or more cores enclosed in a common sheathing 2.1 interconnecting wiring the cables forming the circuits connecting components, such as sensors, detectors, processors, warning and/or signalling devices, and control equipments of an intruder alarm system 2.2 conductor 2.10 cable Materials and construction 3.1 Conductors Conductor, or conductor strands, shall be plain or tinned and made from annealed solid copper complying with the requirements of BS 4109 for copper of condition Solid conductors shall be of minimum nominal cross-sectional area 0.20 mm2 complying with the requirements given in Table of BS 6360:1981 for class solid conductors If less than 0.5 mm2 in cross-sectional area, the maximum resistance at 20 ºC shall be 95 Ω/km for a nominal cross-sectional area of 0.20 mm2 and pro rata up to 0.5 mm2 Stranded conductors shall be of minimum nominal cross-sectional area 0.22 mm2 complying with the requirements given in Table of BS 6360:1981 for class conductors Strands in a stranded conductor shall be laid straight or twisted together with the same nominal length of lay, but without restriction upon the length of lay Joins in strands shall be brazed or hard soldered with no joint closer than 300 mm to any other in the same conductor and with a tensile strength of not less than 90 % of that of an adjacent length of strand when tested in accordance with BS 4808-1 over a 250 mm length Conductors shall not be joined other than as joints in individual strands made as specified in this subclause ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ a solid or stranded assembly forming that part of a core or cable with the specific function of carrying current 2.3 stranded conductor a conductor made up of a number of parallel strands assembled, without intermediate insulation, by twisting the strands together in a helical formation or by laying them straight 2.4 length of lay the axial length of one complete turn of the helix formed by twisting together the strands of a conductor or the cores of a cable, strands or cores laid straight having an infinite length of lay 2.5 insulation a layer of material applied to a conductor with the specific function of resisting current flow between the conductor and any adjacent conductive material 2.6 core a single conductor with its insulation but not including any sheathing © BSI 12-1998 BS 4737-3.30:1986 3.2 Cores Cores shall consist of a solid conductor, or a stranded conductor with not less than seven strands of nominal diameter 0.20 mm, covered with type or type Tl.1 compound PVC insulation complying with BS 6746, with a minimum point thickness of 0.15 mm when measured in accordance with BS 4808-1 The insulation shall fit closely to the conductor without adhesion such that it shall be possible to strip the insulation without damage to the conductor The shrinkage and thermal endurance of a core shall comply with the requirements of BS 4808-1 A core shall withstand 500 V r.m.s when tested in accordance with the spark test described in BS 4808-1 3.3 Cable Cable shall consist of one or more cores sheathed with type or type TM PVC compound complying with BS 6746 with a minimum point thickness of 0.4 mm when measured in accordance with BS 4808-1 Cores shall be laid straight or twisted together with the same length of lay, but without restriction upon the length of lay, to form a compact cable NOTE The twisting of cores in pairs can be advantageous in certain circumstances A bundle of cores may be wrapped with polyester tape prior to sheathing Sheathing shall be continuous, tubed or filled, and shall fit closely over the core(s) without adhesion The filling material of filled sheathing shall be to the same specification as that of the sheathing and shall be formed in the same operation Insulation resistance measurements shall be made on the completed cable with not less than 500 V d.c After steady electrification for the insulation shall be measured between each conductor in the cable and the remaining conductors connected together The value of insulation resistance shall be not less than 50 MΩ, for 000 m at 20 ± ºC NOTE the test Cores may be grouped in any convenient manner for Marking and packaging Cable claimed to comply with the requirements of this standard shall be supplied coiled on a spool or drum marked with the following: a) the name or identification mark of the manufacturer; NOTE Where the cable incorporates an identification thread this should be in accordance with PD 2379 b) the length of cable on the spool or drum; c) the number of cores in the cable; d) the nominal cross-sectional area of the conductor in mm2; e) the number and diameter (in mm) of the strands in a stranded conductor, separated by a stroke, e.g 7/0.20; f) the number and date of this British Standard, i.e BS 4737-3.30:1986.1) Where the cores in a cable are not all of the same type the information required by (d) and/or (e) shall be given separately for each core ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ NOTE A rip cord with a breaking strength of not less than 40 N should be provided under sheathing to facilitate its removal Cable shall be without joins other than the joints in individual strands of the conductor made as specified in 3.1 NOTE Requirements for the necessary joints in cable of an installed intruder alarm system are given in BS 4737-1 1) Marking BS 4737-3.30:1986 on or in relation to a product is a claim by the manufacturer that the product has been manufactured to the requirements of the standard The accuracy of such a claim is therefore solely the manufacturer's responsibility Enquiries as to the availability of third party certification should be addressed to the appropriate certification body © BSI 12-1998 BS 4737-3.30:1986 Publications referred to BS 4109, Copper for electrical purposes BS 4727, Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms2) BS 4737, Intruder alarm systems in buildings BS 4737-1, Specification for installed systems with local audible and/or remote signalling BS 4808, L.F cables and wires with PVC insulation and PVC sheath for telecommunication BS 4808-1, General requirements and tests BS 6360, Specification for conductors in insulated cables and cords BS 6746, PVC insulation and sheath of electrical cables PD 2379, Register of colours of manufacturers’ identification threads for electric cables and cords ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 2) Referred to in the foreword only © BSI 12-1998 BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI Ð British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover Tel: 020 8996 9000 Fax: 020 8996 7400 BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services Tel: 020 8996 9001 Fax: 020 8996 7001 In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service Various BSI electronic information services are also available which give details on all its products and services Contact the Information Centre Tel: 020 8996 7111 Fax: 020 8996 7048 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards For details of these and other benefits contact Membership Administration Tel: 020 8996 7002 Fax: 020 8996 7001 Copyright Copyright subsists in all BSI publications BSI also holds the copyright, in the UK, of the publications of the international standardization bodies Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means ± electronic, photocopying, recording or otherwise ± without prior written permission from BSI This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained If permission is granted, the terms may include royalty payments or a licensing agreement Details and advice can be obtained from the Copyright Manager Tel: 020 8996 7070 ... terms2) BS 4737, Intruder alarm systems in buildings BS 4737-1, Specification for installed systems with local audible and/or remote signalling BS 4808, L.F cables and wires with PVC insulation... requirements for PVC insulated cables for use as interconnecting wiring in intruder alarm systems in buildings The cables specified are not for use in locations open to the weather without additional... in typical intruder alarm installations, in normally encountered environments; other types of cable and/or insulation may be appropriate in atypical situations In compiling the necessary definitions