1、BRITISH STANDARD BS EN 50290-2-1:2005 Communication cables Part 2-1: Common design rules and construction The European Standard EN 50290-2-1:2005 has the status of a British Standard ICS 33.120.10 BS EN 50290-2-1:2005 This British Standard was published under the authority of the Standards Policy an
2、d Strategy Committee on 22 March 2005 BSI 22 March 2005 ISBN 0 580 45654 4 National foreword This British Standard is the official English language version of EN 50290-2-1:2005. The UK participation in its preparation was entrusted to Technical Committee EPL/46, Communication cables, wires and waveg
3、uides, R.F. 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-references The British Standards which implement international or European publications r
4、eferred 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 the necessary pr
5、ovisions 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 the interpretati
6、on, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary 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
7、notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 50290-2-1 NORME EUROPENNE EUROPISCHE NORM February 2005 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Norma
8、lisation 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 worldwide for CENELEC members. Ref. No. EN 50290-2-1:2005 E ICS 33.120.10 English vers
9、ion Communication cables Part 2-1: Common design rules and construction Cbles de communication Partie 2-1: Rgles de conception communes et construction Kommunikationskabel Teil 2-1: Allgemeine Entwurf- und Konstruktionsregeln This European Standard was approved by CENELEC on 2004-10-01. CENELEC memb
10、ers 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 standards may be obtained on applicati
11、on 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 notified to the Central Secretariat h
12、as 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, Malta, Netherlands, Norway, Pola
13、nd, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 50290-2-1:2005 - 2 - Foreword This European Standard was prepared by the Technical Committee CENELEC TC 46X, Communication cables. The text of the draft was submitted to the formal vote and was approved by CENELEC as
14、 EN 50290-2-1 on 2004-10-01. 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) 2005-10-01 latest date by which the national standards conflicting with the EN have to be withdraw
15、n (dow) 2007-10-01 This European Standard has been prepared under the European Mandate M/212 given to CENELEC by the European Commission and the European Free Trade Association. _ - 3 - EN 50290-2-1:2005 Contents Introduction 5 1 Scope6 2 Normative references6 3 Definitions6 4 Common design rules.6
16、4.1 Materials.6 4.1.1 Conductor materials6 4.1.2 Optical fibres.8 4.1.3 Taping / fillers8 4.1.4 Insulating and sheathing materials8 4.1.5 Messenger wires.8 4.1.6 Armour9 4.2 Cable make-up.10 4.2.1 General design10 4.2.2 Sheathing 10 4.2.3 Marking.10 5 Register of symbols used.11 6 M aterial constant
17、s.13 6.1 Table of material constants relating to dielectric and sheath and their values for different materials .13 6.2 Tables of material constants relating to conductors.14 6.3 Construction constants.15 6.3.1 Table of construction constants relating to inner conductor15 6.3.2 Table of construction
18、 constants relating to braided outer conductors and screens15 6.4 Braid wire dimensions 15 6.5 Attenuation factors .16 6.6 Maximum permissible input power/ current carrying capacity16 6.6.1 Coaxial cables.16 6.6.2 Balanced cables18 7 Standard values of characteristic impedance and outer diameter of
19、dielectric for coaxial cables 18 7.1 Impedance of coaxial cables18 7.2 Nominal diameters over dielectric of coaxial cables 18 8 Coaxial cable construction details 20 8.1 General.20 8.2 Inner conductor20 8.3 Stranded inner conductor.20 8.4 Braided outer conductor.21 8.5 Medium between outer conductor
20、 and screen .21 8.6 Braided screen .21 8.7 Sheath22 8.8 Attenuation.22 8.9 Nominal characteristic impedance z oand capacitance c 2per unit length.23 9 Standard values of characteristic impedance and outer diameter of dielectric for symmetrical cables23 9.1 Impedance of symmetrical cables23 10 Symmet
21、rical cable construction details 24 10.1 Attenuation25 EN 50290-2-1:2005 - 4 - 11 Common characteristics.25 11.1 Weight calculation 25 12 Calculation of electrical properties26 12.1 DC resistance of conductors and screen, per unit length.26 12.2 Permissible voltages.26 12.2.1 Test voltage, dielectri
22、c, u t .26 12.2.2 Discharge test voltage, dielectric, u d 27 12.2.3 Test voltage, sheath27 - 5 - EN 50290-2-1:2005 Introduction EN 50290-2-1 series gives directly or by reference all common requirements for communication cables. It is completed by generic, sectional, family and detail specifications
23、, as appropriate, to describe in a detailed manner each type of cables with its specific characteristics. EN 50290, which is the basic reference standard for communication cables, consists of the following parts: Part 1-1 General Part 1-2 Definitions Part 2-1 Common design rules and construction Par
24、t 2-1X Materials Part 3 Quality assessment Part 4-1 Environmental conditions and safety aspects Part 4-2 Guide for use The test methods are described in the basic reference standard EN 50289, Communication cables - Specifications for test methods, which consists of the following parts: Part 1-X Elec
25、trical test methods Part 2-X Transmission and optical test methods Part 3-X Mechanical test methods Part 4-X Environmental test methods EN 50290-2-1:2005 - 6 - 1 Scope This European Standard harmonises the standardisation of symmetrical, coaxial and optical cables used for the infrastructure of comm
26、unication, multimedia and control networks. Most of the cables covered by this European Standard are primarily intended to be used in IT networks. However, they can also be used for other applications with the exception of those which presume a direct connection to the mains electricity supply. EN 5
27、0290-2-1 gives the common rules for the design and construction of symmetrical, coaxial and optical cables used for the infrastructure of communication and control networks. It is to be used in conjunction with EN 50290-1-1 and is completed by generic, sectional, family and detail specifications, as
28、 appropriate, to describe in a detailed manner each type of cable with its specific characteristics. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the lat
29、est edition of the referenced document (including any amendments) applies. EN 50290-1-2 Communication cables - Part 1-2: Definitions EN 50290-2-23 Part 2-23: Materials - PE insulation EN 50290-2-24 Part 2-24: Materials - PE sheathing EN 50290-2-25 Part 2-25: Materials - Polypropylene insulation comp
30、ounds EN 50290-2-26 Part 2-26: Materials - Halogen free flame retardant insulation compounds EN 50290-2-27 Part 2-27: Materials - Halogen free flame retardant thermoplastic sheathing compounds IEC 60304 Standard colours for insulation for low-frequency cables and wires IEC 60028 International standa
31、rd of resistance for copper IEC 60793-1 Optical fibres - Part 1: Generic specification. 3 Definitions For the purpose of this standard, the definitions given in EN 50290-1-2 apply. 4 Common design rules 4.1 Materials 4.1.1 Conductor materials 4.1.1.1 Wires and inner conductors The construction and m
32、aterial of wires or inner conductor shall be specified in the relevant specification. - 7 - EN 50290-2-1:2005 The conductor shall be either solid or stranded annealed copper. The conductivity of the copper shall be in accordance with IEC 60028. Alternatively, the conductor shall consist of copper-cl
33、ad steel. The layer of copper cladding shall be continuous, and shall adhere to the steel; the cross-section shall be circular, such that the maximum resistance of the clad conductor shall not exceed that given for copper conductor, in accordance with IEC 60028, by more than a factor of 4,8, 3,5 and
34、 2,8, respectively, for 21 % (minimum), 30 %, and 40 % nominal conductivity grade copper-clad steel. The percentage elongation at break, when tested in accordance with test methods given in 9.7 shall be not less than 1 %. The minimum tensile strength shall be 827 N/mm, 792 N/mm, 760 N/mm for 21 %, 3
35、0 %, and 40 % grade, respectively. Alternatively, the conductor shall consist of copper clad aluminium. The layer of copper cladding shall be continuous, and shall adhere to the aluminium, the cross section shall be circular, such that the maximum resistance of the clad conductor shall not exceed th
36、at given for copper conductor, in accordance with IEC 60028, by more than a factor of 1.8. The percentage elongation at break, when tested in accordance with test methods given in 9.6 shall not be less than 1 %. Conductor joints made after the last drawing operation are not allowed. The stranded con
37、ductor shall consist of wires circular in section and assembled, without insulation between them, by concentric stranding or bunching. The individual wires of the solid or stranded conductor may be plain or metal-coated. 4.1.1.2 Outer conductor or screen The construction and material of the outer co
38、nductor and/or screen shall be specified in the detail specification. The outer conductor or screen may be a) a single or double braid of plain or metal coated annealed copper wire. Joints in the braiding wires shall be soldered, twisted or woven-in and there shall be no joint in the complete braid.
39、 The braid shall be evenly applied. The braid angle and the filling factor shall be specified in the detail specification, b) a copper or aluminium tape formed round the core as a continuous and closed screen with a sufficient overlap bonded or not bonded as specified in the detail specification, c)
40、 a high permeability alloy tape, helically wound with overlap, d) a gas-tight tube of copper or aluminium material (i.e. extruded, welded smooth or corrugated), e) a layer of metal foil or metallised film applied with a sufficient overlap bonded or not bonded, covered with a copper braid as in item
41、a) above. When the metal foil or the film is in copper, the braid shall be in copper. When the metal foil or the film is in aluminium, the braid shall be in aluminium or tinned copper. The braid shall always be in contact with metal, f) a screen as described in d) with two layers of bi-directional h
42、elically wound wires instead of braid, g) any combination of these. EN 50290-2-1:2005 - 8 - 4.1.2 Optical fibres Optical fibres shall be uniform in quality and their characteristics shall meet the requirements of IEC 60793-2-XX. 4.1.3 Taping / Fillers Tapes and/or fillers may be used to achieve a ci
43、rcular cross section of the cable, and/or to prevent moisture ingress and/or to achieve the required electrical, mechanical and environmental performance. They usually consist of plastic, fibreglass, aromatic polyamide, or swellable material depending upon the intended use. The relevant specificatio
44、n shall give details of the taping and fillers to be used. 4.1.4 Insulating and sheathing materials The insulation and outer sheath of the cable shall be of a suitable material as specified in the relevant cable specification. It may be solid, cellular, or composite (e.g. foam skin, plastic/metal co
45、mposite). Unless otherwise specified, plastic materials for sheath and insulation shall comply with the relevant part of EN 50290-2-XX. The insulation and sheath shall have appropriate mechanical characteristics before and after ageing within the temperature limits to which it may be exposed to norm
46、al use. 4.1.5 Messenger wires 4.1.5.1 Design This standard specifies requirements for aerial messenger wires. Messenger wires shall consist of either a strand (wires twisted together with a uniform lay) or a single wire. Messenger wire may consist of metallic or non-metallic materials. In case of me
47、tallic material, the material used shall consist of either aluminium alloy or steel which may be galvanised. Interstices between the stranded wires may be bituminised as an available option. Unless otherwise specified in the relevant detail specification, wires in the outer layer of strands shall ha
48、ve a left-hand lay (S strand) and in case of strands with more than seven wires, the lay direction shall alternate for each successive layer. - 9 - EN 50290-2-1:2005 In the case of a Figure 8-shaped design as shown below, unless otherwise specified in the detail specification, the height (a) and the
49、 thickness (b) of the web should be in accordance with Table 1. Outer diameter of the cable4.1.5.2 Information to be supplied The following information shall be given in the relevant detail specification. strand and wire diameter mm; cross section mm; nominal overall messenger diameter and tolerances mm; approximate mass kg/km; breaking load kN; effective modulus of elasticity kN/ mm; coefficient of linear expansion 1/C. wire material 4.1.6 Arm
