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1、BRITISH STANDARD BS EN 60708:2005 Low-frequency cables with polyolefin insulation and moisture barrier polyolefin sheath The European Standard EN 60708:2005 has the status of a British Standard ICS 29.060.20 ? Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:33:00 GMT+00:00 2006, Uncontroll
2、ed Copy, (c) BSI BS EN 60708:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 23 January 2006 BSI 23 January 2006 ISBN 0 580 47543 3 National foreword This British Standard is the official English language version of EN 60708:2005. It is
3、identical with IEC 60708:2005. The UK participation in its preparation was entrusted to Technical Committee EPL/46, Communication cables, wires and waveguides, RF connectors and accessories for communication and signalling, which has the responsibility to: A list of organizations represented on this
4、 committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using
5、the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from
6、 legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. S
7、ummary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 27 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: s
8、heffieldun sheffieldun, na, Fri Nov 10 07:33:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 60708 NORME EUROPENNE EUROPISCHE NORM November 2005 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr E
9、lektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60708:2005 E ICS 29.060.20 English version Low-frequency cables with polyolefin insulation an
10、d moisture barrier polyolefin sheath (IEC 60708:2005) Cbles pour basses frquences isolation polyolfine et gaine polyolfine barrire dtanchit (CEI 60708:2005) Niederfrequenzkabel mit Isolierung aus Polyolefin und mit Polyolefin- Schichtenmantel (IEC 60708:2005) This European Standard was approved by C
11、ENELEC on 2005-09-13. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national stan
12、dards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official 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 not
13、ified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg
14、, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:33:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Foreword The text of document 46C/713/FDIS, future edition 1 of IEC 60708, pre
15、pared by SC 46C, Wires and symmetric cables, of IEC TC 46, Cables, wires, waveguides, R.F. connectors, R.F. and microwave passive components and accessories, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60708 on 2005-09-13. The following dates were fixed: latest d
16、ate by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2006-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2008-10-01 Annex ZA has been added by CENELEC. _ Endorsement
17、notice The text of the International Standard IEC 60708:2005 was approved by CENELEC as a European Standard without any modification. _ EN 60708:2005 2 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:33:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 EN 60708:2005 CONTENTS 1 Scope 5 2 Norm
18、ative references .5 3 Quality assurance.6 4 Cable construction6 4.1 Conductor .6 4.1.1 Conductor material.6 4.1.2 Type of conductor 6 4.1.3 Conductor-finish.6 4.1.4 Continuity of conductor 6 4.2 Insulation 7 4.2.1 Insulation material7 4.2.2 Insulation thickness7 4.2.3 Colour of insulated conductor.7
19、 4.3 Cabling element 7 4.4 Stranding 7 4.5 Colour code.7 4.5.1 General .7 4.5.2 Sub-units, units and cables up to and including 100 pairs or 100 quads8 4.5.3 Cables of more than 100 pairs or 100 quads.8 4.6 Spare pairs or quads .9 4.7 Filling9 4.8 Core protection9 4.9 Sheath 9 4.9.1 Sheath material9
20、 4.9.2 Application of the sheath9 4.10 Cable protection 10 4.11 Finished cable.10 4.11.1 Overall diameter 10 4.11.2 Sheath marking10 4.11.3 Sealing of ends11 4.12 Delivery.11 5 Mechanical requirements11 5.1 Conductor .11 5.2 Insulation 11 5.3 Sheath 11 5.3.1 Tensile strength and elongation11 5.3.2 A
21、dhesion of aluminium tape to the polyethylene11 5.3.3 Adhesion of aluminium tape at the overlap12 5.4 Finished cable.12 5.4.1 Sheath integrity12 5.4.2 Resistance to water penetration .12 5.4.3 Cable drip12 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:33:00 GMT+00:00 2006, Uncontrolled C
22、opy, (c) BSI EN 60708:2005 6 Thermal stability and environmental requirements .12 6.1 Insulation 12 6.1.1 Thermal oxidative stability (OIT-test) 12 6.1.2 Shrinkage 13 6.1.3 Wrapping test of insulation after thermal aging .13 6.1.4 Bending test at low temperature .13 6.2 Sheath 13 6.2.1 Elongation at
23、 break after ageing.13 6.2.2 Resistance to weathering .13 6.2.3 Resistance to environmental stress cracking.13 7 Electrical requirements .13 7.1 General.13 7.2 Electrical resistance of conductor.13 7.3 Electrical resistance unbalance14 7.4 Dielectric strength14 7.5 Insulation resistance14 7.6 Mutual
24、 capacitance14 7.7 Capacitance unbalance15 7.8 Transmission characteristics (when used for digital communication) .16 7.8.1 Attenuation 16 7.8.2 Near End Crosstalk (NEXT)16 7.8.3 Equal Level Far-end Crosstalk (ELFEXT)16 7.8.4 Power sum (PS) of crosstalk loss .16 7.8.5 Characteristic impedance.16 7.8
25、.6 Velocity of propagation.16 Annex A (normative) Colour code: 10 pair or 5 quad count.18 Annex B (normative) Colour code: sub-unit identification for 50 pair (25 quad) and 100 pair (50 quad) cables or units, using 10 pair or 5 quad count.19 Annex C (normative) Colour code: 25 pair count20 Annex D (
26、normative) Colour code: unit identification for 50 pair or quad and 100 pair or quad cables or units, using 25 pair or quad count21 Annex E (normative) Colour code: 25 quad count 22 Annex F (normative) Colour code: unit identification for cables with more than 100 pairs, 25 pair count 23 Annex G (no
27、rmative) Colour code: unit identification for cables with more than 100 pairs or 50 quads, using 10 pair or 5 quad count or 25 quad count .25 Annex ZA (normative) Normative references to international publications with their corresponding European publications .26 4 Licensed Copy: sheffieldun sheffi
28、eldun, na, Fri Nov 10 07:33:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 5 EN 60708:2005 LOW-FREQUENCY CABLES WITH POLYOLEFIN INSULATION AND MOISTURE BARRIER POLYOLEFIN SHEATH 1 Scope This standard is intended to define polyolefin-insulated cables for insertion into local outdoor networks. This sta
29、ndard is applicable to polyolefin insulated and moisture barrier polyolefin sheathed telephone cables, filled or unfilled with copper conductors, and used as: a) Cables suitable for installation in ducts. b) Cables suitable for direct burial in the ground. c) Cables with integral suspension strand f
30、or aerial installations. This standard is in accordance with ITU-T Recommendations. This standard includes general design details and requirements for dimensions and other constructional details as well as mechanical, electrical and environmental characteristics for all types of low-frequency cables
31、 with polyolefin insulation (solid or cellular), filled or unfilled, and moisture barrier polyolefin sheath (with integral suspension strand). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cite
32、d applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60028, International Standard of Resistance for Copper IEC 60189-1, Low-frequency cables and wires with PVC Insulation and PVC sheath Part 1: General test and measuring methods IE
33、C 60304, Standard colours for insulation for low-frequency cables and wires IEC 60794-1-2, Optical fibre cables Part 1-2: Generic specification Basic optical cable test procedures IEC 60811-1-1, Common test methods for insulating and sheathing materials of electric cables Part 1: Methods for general
34、 application Section 1: Measurement of thickness and overall dimensions Tests for determining the mechanical properties IEC 60811-1-2, Common test methods for insulating and sheathing materials of electric cables Part 1: Methods for general application Section Two: Thermal ageing methods IEC 60811-1
35、-3, Insulating and sheathing materials of electric cables Part 1: General application Section 3: Methods for determining the density Water absorption tests Shrinkage test IEC 60811-1-4, Common test methods for insulating and sheathing materials of electric cables Part 1: Methods for general applicat
36、ion Section Four Test at low temperature Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:33:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60708:2005 6 IEC 60811-4-1, Insulating and sheathing materials of electric and optical cables Common test methods Part 4-1: Methods specific to polye
37、thylene and polypropylene compounds Resistance to environmental stress cracking Measurement of the melt flow index Carbon black and/or mineral filler content measurement in polyethylene by direct combustion Measurement of carbon black content by thermogravimetric analysis (TGA) Assessment of carbon
38、black dispersion in polyethylene using a microscope IEC 60811-4-2, Insulating and sheathing materials of electric and optical cables Common test methods Part 4-2: Methods specific to polyethylene and polypropylene compounds Tensile strength and elongation at break after conditioning at elevated temp
39、erature Wrapping test after conditioning at elevated temperature Wrapping test after thermal ageing in air Measurement of mass increase Long-term stability test Test method for copper- catalyzed oxidative degradation IEC 60811-5-1, Common test methods for insulating and sheathing materials of electr
40、ic cables Part 5-1: Methods specific to filling compounds Drop point Separation of oil Lower temperature brittleness Total acid number Absence of corrosive components Permittivity at 23 C DC resistivity at 23 C and 100 C IEC 61156-1, Multicore and symmetrical pair/quad cables for digital communicati
41、ons Part 1: Generic specification ITU-T L.3, Armouring of cables 3 Quality assurance It is the responsibility of the manufacturer to establish quality assurance by quality control procedures which will ensure that the product will meet the requirements of this standard. It is not intended that a com
42、plete testing programme shall be carried out on every length of conductor and cable. When the purchaser wishes to specify acceptance tests or other quality procedures, it is essential that agreement be reached between the purchaser and the manufacturer by the time of ordering. 4 Cable construction 4
43、.1 Conductor 4.1.1 Conductor material The conductor shall consist of annealed copper, uniform in quality and free from defects. The properties of the copper shall be in accordance with IEC 60028. 4.1.2 Type of conductor The conductor shall consist of a single strand circular in section. The nominal
44、diameter shall be at least 0,4 mm. 4.1.3 Conductor-finish The conductor shall be plain. 4.1.4 Continuity of conductor Joints in the conductor are permitted provided that the tensile strength of a joint is not less than 90 % of the tensile strength of the unjointed conductor. Licensed Copy: sheffield
45、un sheffieldun, na, Fri Nov 10 07:33:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 7 EN 60708:2005 4.2 Insulation 4.2.1 Insulation material The conductor shall be covered with solid or cellular polyolefin insulation or any combination thereof. For cellular insulation, the cells produced by the expan
46、ding process shall be uniformly distributed circumferentially and should be substantially non-intercommunicating. The material for the insulation shall be a virgin thermoplastic compound suitably stabilized. Examples of suitable materials are: Polyethylene. Polypropylene. 4.2.2 Insulation thickness
47、The insulation shall be continuous and shall have a thickness such that the completed cable will meet the electrical requirements specified. 4.2.3 Colour of insulated conductor The insulated conductors shall be coloured. Colours shall be readily identifiable and shall correspond reasonably with the
48、standard colours shown in IEC 60304. 4.3 Cabling element A cabling element (Figure 1) shall be: - a pair of two insulated conductors twisted together and designated wire a and b respectively, or - a quad of four insulated conductors twisted together and designated wire a, wire c, wire b, and wire d
49、respectively. The maximum length of lay in the finished cable shall not exceed 150 mm. NOTE Forming the element with a variable lay can lead to the infrequent but acceptable occurrence of the maximum lay being longer than specified. 4.4 Stranding The cable elements shall be formed into a number of sub-units or units which can be stranded in