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1、BRITISH STANDARD BS EN 50168:1996 Sectional specification for work area wiring cables with a common overall screen for use in digital communication The European Standard EN 50168:1994 has the status of a British Standard ICS 29.060.20 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:07:14 G
2、MT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 50168:1996 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 January 1996 BSI 08-1999 The following BSI references
3、relate to the work on this standard: Committee reference EPL/46/1 Special announcement in BSI News October 1995 ISBN 0 580 24892 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee EPL/46, Cables, wires and waveguides, RF c
4、onnectors and accessories for communication and signalling, to Subcommittee EPL/46/1, Communication cables, upon which the following bodies were represented: AEA Technology British Approvals Service for Cables British Broadcasting Corporation British Cable Makers Confederation British Railways Board
5、 British Telecommunications plc Cable Communications Association Confederation of Aerial Industries ERA Technology Ltd. Federation of the Electronics Industry London Underground Ltd. Ministry of Defence Society of Cable Television Engineers Amendments issued since publication Amd. No.DateComments Li
6、censed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:07:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 50168:1996 BSI 08-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 501685 List of referencesInside back cover Licensed Copy: sheffieldun
7、 sheffieldun, na, Mon Nov 06 07:07:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 50168:1996 ii BSI 08-1999 National foreword This British Standard has been prepared by Subcommittee EPL/46/1 and is the English language version of EN 50168:1994, Sectional specification for work area wiring cable
8、s with a common overall screen for use in digital communication, published by the European Committee for Electrotechnical Standardization (CENELEC). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct
9、 application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred toCorresponding British Standard HD 602 S1:1992BS 6425 Test on gases evolved during the combustion of materials from cables Part 2:1993 Determination of d
10、egree of acidity (corrosivity) of gases by measuring pH and conductivity HD 606.1 S1:1992BS 7622 Measurement of smoke density of electric cables burning under defined conditions Part 1:1993 Test apparatus HD 606.2 S1:1992Part 2:1993 Test procedure and requirements HD 608 S1:1992BS 7630:1993 Generic
11、specification for symmetric pair/quad and multicore cables for digital communication Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 12, an inside back cover and a back cover. This standard has been updated (see copyright d
12、ate) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:07:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50168 October 1994 I
13、CS 29.060.20 Descriptors: Work area wiring cables, digital communication English version Sectional specification for work area wiring cables with a common overall screen for use in digital communication Spcification intermdiaire de cbles avec cran extrieur pour transmissions numriques destins au cbl
14、age de raccordement de terminal Bauart-Spezifikation fr Gerteanschlukabel mit gemeinsamen Schirm fr digitale Kommunikation This European Standard was approved by CENELEC on 1994-07-05. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for gi
15、ving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official
16、 versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committe
17、es of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europi
18、sches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1994 Copyright reserved to CENELEC members Ref. No. EN 50168:1994 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:07:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50168:1994 BSI 08-1999
19、 2 Foreword This European Standard was prepared by CENELEC Subcommittee SC 46XC, Multicore, Multipair and Quad Data communication cables. It was submitted to the CENELEC Unique Acceptance Procedure (UAP) in November 1993 and was approved by CENELEC as EN 50168 on 1994-07-05. The following dates were
20、 fixed: Wherever this standard refers to “Generic Specification”, HD 608 S1:1992 is meant. NOTEThis HD 608 will be updated into a European Standard. Contents Page Foreword2 1Guide to use5 1.1Scope5 1.2Introduction5 1.3Installation considerations5 1.4Object5 2Definitions and requirements5 2.1General5
21、 2.2Reference publications5 2.3Definitions5 2.4Materials and cable construction6 2.4.1General6 2.4.2Cable construction6 2.4.3Conductor6 2.4.4Insulation6 2.4.5Cable element6 2.4.6Screening of the cable element6 2.4.7Colour code of insulation6 2.4.8Cable make-up6 2.4.9Screening of the cable core6 2.4.
22、10 Sheath7 2.4.11 Colour of sheath7 2.4.12 Identification7 2.4.13 Finished cable7 2.4.14 Cable overall diameter7 3Characteristics and requirements7 3.1General7 3.2Electrical tests7 3.2.1Conductor resistance7 3.2.2Resistance unbalance7 3.2.3Dielectric strength7 3.2.4Insulation resistance7 3.2.5Mutual
23、 capacitance7 3.2.6Capacitance unbalance7 3.2.7Transfer impedance8 3.3Transmission characteristics8 3.3.1Velocity of propagation8 3.3.2Attenuation8 3.3.3Unbalance attenuation8 3.3.4Near-end crosstalk8 3.3.5Far-end crosstalk9 3.3.6Characteristics impedance9 3.3.7Structural Return Loss (SRL)9 latest d
24、ate of publication of an identical national standard(dop) 1995-07-15 latest date of withdrawal of conflicting national standards(dow) 1995-07-15 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:07:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50168:1994 BSI 08-19993 Page 3.3.8Longitudina
25、l to Differential Conversion Loss (LCL)9 3.4Mechanical and dimension characteristics and requirements9 3.4.1Dimensional requirements9 3.4.2Elongation at break of conductors9 3.4.3Elongation and tensile strength at break of the insulation9 3.4.4Elongation and tensile strength at break of sheath9 3.4.
26、5Crushing of the cable9 3.4.6Impact test on the cable9 3.4.7Repeated bending of the cable9 3.4.8Tensile performance of the cable9 3.5Environmental characteristics9 3.5.1Shrinkage of insulation9 3.5.2Wrapping of insulation after thermal ageing9 3.5.3Bending of insulation at low temperature9 3.5.4Elon
27、gation and tensile strength at break of the sheath after ageing9 3.5.5Sheath pressure test at high temperature9 3.5.6Cold bend of the cable10 3.5.7Heat shock10 3.5.8Flame propagation characteristics of single cable10 3.5.9Flame propagation characteristics of bunched cables10 3.5.10 Acid gas evolutio
28、n10 3.5.11 Smoke generation10 3.5.12 Toxic gas emission10 4Quality assessment procedures10 Annex A (informative) Attentuation and NEXT11 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:07:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 blank Licensed Copy: sheffieldun sheffieldun, na, Mon
29、Nov 06 07:07:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50168:1994 BSI 08-19995 1 Guide to use 1.1 Scope This standard refers to HD 608 S1:1992, Generic specification for symmetrical pair/quad or multicore cables for digital communications. It covers individually screened pair(s) or quad(s) in
30、 cables for work area wiring. The cables shall be provided with a common overall screen. These cables are suitable for different communication systems to which reference is made in detail specifications. The cables covered by this specification are intended to operate with voltages and currents norm
31、ally adopted for communication systems. These cables shall not be connected to low impedance sources, for example, the public mains electricity supply. 1.2 Introduction See Generic Specification. 1.3 Installation considerations See Generic Specification. 1.4 Object The cables specified in this stand
32、ard shall meet the requirements of the Generic Specification. This sectional specification may be supplemented with specific specifications given additional information if required by a particular application (e.g. regarding safety and reliability conditions). 2 Definitions and requirements 2.1 Gene
33、ral See Generic Specification. 2.2 Reference publications Add to 2.2.1 of the Generic Specification: HD 602, Test on gases evolved during the combustion of materials from cables Part 2: Determination of degree of acidity (corrosivity) of gases by measuring pH and conductivity (IEC 754-2). HD 606.1,
34、Measurement of smoke density of electric cables under defined conditions Part 1: Test apparatus (IEC 1034-1 modified). HD 606.2, Part 2: Test procedures and requirements (IEC 1034-2 modified). HD 624, Materials used in communication cables. HD 624.3, Part 3: PE insulation. HD 624.5, Part 5: Polyprop
35、ylene insulation compounds (in preparation). HD 624.6, Part 6: Halogen free flame-retardant insulation compounds (in preparation). HD 624.7, Part 7: Halogen free flame-retardant thermoplastic sheathing compound. IEC 96.1, Radio frequency cables Part 1: General requirements and measuring methods. IEC
36、 189, Low-frequency cables and wires with PVC insulation and PVC sheath. IEC 344, Guide to the calculation of resistance of plain and coated copper conductors of low-frequency cables and wires. Add to 2.2.2 of the Generic Specification: ITU G 117, Transmission aspects of unbalance about earth (defin
37、itions and methods). 2.3 Definitions See Generic Specification. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:07:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50168:1994 6 BSI 08-1999 2.4 Materials and cable construction 2.4.1 General See Generic Specification. 2.4.2 Cable constructio
38、n See Generic Specification. 2.4.3 Conductor The conductor shall consist of annealed copper. The conductor shall be stranded. The stranded conductor shall consist of seven wires each with a minimum nominal diameter of 0,1 mm to 0,2 mm. The conductor shall be plain or metal coated. The conductor may
39、consist of one or more elements of thin copper or copper alloy tape which shall be applied spirally over a fibrous thread (Tinsel). The maximum conductor resistance shall be specified in the relevant detail specifications. Joints in the complete element shall not be permitted. 2.4.4 Insulation The c
40、onductor shall be insulated with a suitable thermoplastic material meeting the requirements specified in the relevant detail specification. Materials are: Polyolefin (HD 624.3 or HD 624.5) Low smoke zero halogen thermoplastic material (HD 624.6) The insulation may be solid or cellular with or withou
41、t a solid dielectric skin. The insulation shall be continuous and shall have a thickness such that the completed cable meets the electrical requirements specified in the relevant detail specifications. The maximum overall diameter of the insulated conductor and conductor eccentricity shall be compat
42、ible with the method of conductor connection as specified in the relevant detail specification. 2.4.5 Cable element The cable element shall be a pair or a quad. The maximum length of lay in the finished cable shall not exceed 150 mm. 2.4.6 Screening of the cable element When required in the relevant
43、 detail specification a screen for the cabling element shall be provided. The screen shall be in accordance with subclause 2.4.6 of the Generic Specification. Where a copper braid is used is shall have a minimum filling factor of 0,41 (65 % coverage). Where a tape and braid screen is used the minimu
44、m filling factor of the braid shall be 0,16 (30 % coverage). The filling factor is defined in the Generic Specification. 2.4.7 Colour code of insulation The colour code shall be indicated in the relevant detail specification. The colours shall be readily identifiable and the shade of colour shall co
45、rrespond reasonably with the standard colours shown in HD 402 (IEC 304). 2.4.8 Cable make-up The cable elements shall be assembled to form the cable core. The core of the cable may be wrapped with a protective layer of non-hydroscopic material. 2.4.9 Screening of the cable core The screen shall be i
46、n accordance with subclause 2.4.9 of the Generic Specification. Where a copper braid is used it shall have a minimum filling factor of 0,41 (65 % coverage). Where a tape and braid screen is used the minimum filling factor of the braid shall be 0,16 (30 % coverage). The filling factor is defined in t
47、he Generic Specification. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:07:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50168:1994 BSI 08-19997 2.4.10 Sheath The sheath shall consist of a low smoke zero halogen thermoplastic material (HD 624.7). The sheath shall be continuous having
48、a thickness as uniform as possible and with a value indicated in the relevant detail specification. A non-metallic rip cord may be provided. 2.4.11 Colour of sheath See Generic Specification 2.4.12 Identification Colour code preferably in accordance with IEC 189. 2.4.13 Finished cable See Generic Sp
49、ecification. 2.4.14 Cable overall diameter The overall diameter of the cable shall not exceed the value specified in the relevant detail specifications. 3 Characteristics and requirements 3.1 General The relevant detail specification defines the performance criteria of a cable and shall indicate the limits required for tests which shall be selected from the following. The test methods shall be in accordance with the Generic Specification unless otherwise specified. NOTEFor any cable not all the tests listed may be required. 3.2 Electrical tests