1、BRITISH STANDARDBS EN 60708:2005Low-frequency cables with polyolefin insulation and moisture barrier polyolefin sheathThe European Standard EN 60708:2005 has the status of a British StandardICS 29.060.20g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3
2、g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Thu Apr 20 02:28:28 BST 2006, Uncontrolled Copy, (c) BSIBS EN 60708:2005This British Standard was published under the authority of the Standards Policy and Strategy Com
3、mittee on 23 January 2006 BSI 23 January 2006ISBN 0 580 47543 3National forewordThis British Standard is the official English language version of EN 60708:2005. It is identical with IEC 60708:2005.The UK participation in its preparation was entrusted to Technical Committee EPL/46, Communication cabl
4、es, wires and waveguides, RF connectors and accessories for communication and signalling, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European
5、 publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all th
6、e necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on th
7、e interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 27 and a back cover.The BSI cop
8、yright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Thu Apr 20 02:28:28 BST 2006, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD EN 60708 NORME EUROPENNE EUROPISCHE NORM November 2005
9、CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2005 CENELEC - All rights of exploitation in any form and by any means reserved
10、worldwide for CENELEC members. Ref. No. EN 60708:2005 E ICS 29.060.20 English version Low-frequency cables with polyolefin insulation and moisture barrier polyolefin sheath (IEC 60708:2005) Cbles pour basses frquences isolation polyolfine et gaine polyolfine barrire dtanchit (CEI 60708:2005) Niederf
11、requenzkabel mit Isolierung aus Polyolefin und mit Polyolefin-Schichtenmantel (IEC 60708:2005) This European Standard was approved by CENELEC 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
12、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 versions (English, French,
13、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 committees of Austria, Belgium, Cypr
14、us, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: Wang Bin, na, Thu Apr 20 02:28:28 B
15、ST 2006, Uncontrolled Copy, (c) BSIForeword The text of document 46C/713/FDIS, future edition 1 of IEC 60708, prepared 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-CENE
16、LEC parallel vote and was approved by CENELEC as EN 60708 on 2005-09-13. The following dates were fixed: latest date 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
17、 conflicting with the EN have to be withdrawn (dow) 2008-10-01 Annex ZA has been added by CENELEC. _ Endorsement 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: Wang Bin, na, Thu Ap
18、r 20 02:28:28 BST 2006, Uncontrolled Copy, (c) BSI 3 EN 60708:2005 CONTENTS 1 Scope 5 2 Normative 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
19、4.2.1 Insulation material7 4.2.2 Insulation thickness7 4.2.3 Colour of insulated conductor.7 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 S
20、pare pairs or quads .9 4.7 Filling 9 4.8 Core protection9 4.9 Sheath 9 4.9.1 Sheath material9 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 requirements 11 5.
21、1 Conductor .11 5.2 Insulation 11 5.3 Sheath 11 5.3.1 Tensile strength and elongation11 5.3.2 Adhesion 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 drip1
22、2 Licensed Copy: Wang Bin, na, Thu Apr 20 02:28:28 BST 2006, Uncontrolled Copy, (c) BSIEN 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
23、.1.4 Bending test at low temperature .13 6.2 Sheath 13 6.2.1 Elongation at 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 u
24、nbalance14 7.4 Dielectric strength14 7.5 Insulation resistance14 7.6 Mutual 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
25、 Power sum (PS) of crosstalk loss .16 7.8.5 Characteristic impedance .16 7.8.6 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 o
26、r 5 quad count.19 Annex C (normative) Colour code: 25 pair count20 Annex D (normative) Colour code: unit identification for 50 pair or quad and 100 pair or quad cables or units, using 25 pair or quad count 21 Annex E (normative) Colour code: 25 quad count 22 Annex F (normative) Colour code: unit ide
27、ntification for cables with more than 100 pairs, 25 pair count 23 Annex G (normative) 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 thei
28、r corresponding European publications .26 4 Licensed Copy: Wang Bin, na, Thu Apr 20 02:28:28 BST 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 ca
29、bles for insertion into local outdoor networks. This standard 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
30、 the ground. c) Cables with integral suspension strand for 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 environment
31、al characteristics for all types of low-frequency cables 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 th
32、is document. For dated references, only the edition cited 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
33、PVC sheath Part 1: General test and measuring methods IEC 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
34、materials of electric cables Part 1: Methods for general 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 app
35、lication Section Two: Thermal ageing methods IEC 60811-1-3, 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
36、 of electric cables Part 1: Methods for general application Section Four Test at low temperature Licensed Copy: Wang Bin, na, Thu Apr 20 02:28:28 BST 2006, Uncontrolled Copy, (c) BSIEN 60708:2005 6 IEC 60811-4-1, Insulating and sheathing materials of electric and optical cables Common test methods P
37、art 4-1: Methods specific to polyethylene 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 an
38、alysis (TGA) Assessment of carbon 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 a
39、fter conditioning at elevated temperature 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
40、and sheathing materials of electric 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/qu
41、ad cables for digital communications 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 standa
42、rd. It is not intended that a complete 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
43、 ordering. 4 Cable construction 4.1 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
44、circular in section. The nominal 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 co
45、nductor. Licensed Copy: Wang Bin, na, Thu Apr 20 02:28:28 BST 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
46、by the expanding 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 Insulatio
47、n thickness 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 reasonab
48、ly with the 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,
49、 and wire d 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 into a regular make up to produce the required number of pairs. 4.5 Col
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