BS 4737-3.30-1986 Intruder alarm systems in buildings

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 a

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

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

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 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

Contents

Page

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 3

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

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 and 2, an inside back cover and a back cover

1 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

NOTE The titles of the publications referred to in this standard

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 apply together with

the following

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

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

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)

2.9 filled sheathing

sheathing which also fills the interstices between cores, closely following their contours

2.10 cable

one or more cores enclosed in a common sheathing

3 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 0

Solid conductors shall be of minimum nominal cross-sectional area 0.20 mm2 complying with the requirements given in Table 1 of BS 6360:1981 for class 1 solid conductors If less than 0.5 mm2 in cross-sectional area, the maximum resistance

at 20 ºC shall be 95Ω/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 3 of BS 6360:1981 for class 5 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

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 2

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 1 500 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 6 or type TM 1 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 1 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

NOTE 2 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 3 Requirements for the necessary joints in cable of an

installed intruder alarm system are given in BS 4737-1.

Insulation resistance measurements shall be made

on the completed cable with not less than 500 V d.c

After steady electrification for 1 min 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 1 000 m at 20 ± 5 ºC

NOTE 4 Cores may be grouped in any convenient manner for the test.

4 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

© BSI 12-1998

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.

2) Referred to in the foreword only.

BSI

389 Chiswick High Road

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