EN 50290-4-2-2014 en Communication cables - Part 4-2 General considerations for the use of cables - Guide to use.pdf

1、BSI Standards PublicationBS EN 50290-4-2:2014Communication cablesPart 4-2: General considerations for the useof cables Guide to useBS EN 50290-4-2:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN50290-4-2:2014. It supersedes BS EN 50290-4-2:2008 which iswith

2、drawn.The UK participation in its preparation was entrusted to TechnicalCommittee EPL/46, Cables, wires and waveguides, radio frequencyconnectors and accessories for communication and signalling.A list of organizations represented on this committee can beobtained on request to its secretary.This pub

3、lication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 80201 0ICS 29.060.20; 33.120.10Compliance with a British Standard cannot conf

4、er immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2014.Amendments issued since publicationDate Text affectedBS EN 50290-4-2:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50290-4-2 December

5、 2014 ICS 33.120.10 Supersedes EN 50290-4-2:2008 English Version Communication cables - Part 4-2: General considerations for the use of cables - Guide to use Kommunikationskabel - Teil 4-2: Allgemeine Betrachtungen fr die Anwendung der Kabel - Leitfaden fr die Verwendung This European Standard was a

6、pproved by CENELEC on 2013-09-16. 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 n

7、ational standards may be obtained on application to the CEN-CENELEC Management Centre 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 it

8、s own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Maced

9、onia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Euro

10、pen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 50290-4-2:2014 E BS EN 5029

11、0-4-2:2014EN 50290-4-2:2014 - 2 - Contents Foreword .3 1 Scope 4 2 Normative references 4 3 Communication cable basics .4 4 Types of cables .5 4.1 General 5 4.2 Twisted pairs cables 5 4.3 Coaxial cable (unbalanced) .6 4.4 Flexible cables versus rigid cables 7 5 Cables and regulations .8 5.1 General

12、8 5.2 Low voltage .8 5.3 Fire reactions and Euroclasses 8 5.4 Electromagnetic behaviour .9 6 Criteria for the choice of the cables . 12 6.1 Cable construction 12 6.2 Cabling . 13 6.3 Transmission performance 14 7 Installation practices 15 7.1 Delivery 15 7.2 Storage . 16 7.3 Pre-installation procedu

13、re 16 7.4 Pulling of the cable . 17 7.5 Installation . 17 7.6 Mechanical considerations 17 8 Cabling installation versus location . 22 8.1 Outside plant . 22 8.2 Intrabuilding . 24 Bibliography . 29 BS EN 50290-4-2:2014- 3 - EN 50290-4-2:2014 Foreword This document (EN 50290-4-2:2014) has been prepa

14、red by CLC/TC 46X “Communication cables“. The following dates are fixed: latest date by which this document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2015-06-05 latest date by which the national standards conflicting with this do

15、cument have to be withdrawn (dow) 2016-09-16 This document supersedes EN 50290-4-2:2008. EN 50290-4-2:2014 includes the following significant technical change with respect to EN 50290-4-2:2008: Subclause 5.3 was revised. This standard should be read in conjunction with EN 50290-1-1 and is completed

16、by generic, sectional, family and detail specifications, as appropriate, to describe in a detailed manner each type of cable with its specific characteristics. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN sha

17、ll not be held responsible for identifying any or all such patent rights. This document has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association. This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment

18、 Designed for Use within Certain Voltage Limits (LVD - 2006/95/EC). EN 50290-4, Communication cables General considerations for the use of cables, is divided into the following sub-parts: Part 4-1: Environmental conditions and safety aspects; Part 4-2: Guide to use the present document. _ BS EN 5029

19、0-4-2:2014EN 50290-4-2:2014 - 4 - 1 Scope The scope of this European Standard is to help installers and cabling designers to understand the range of communication metallic cables available. To help this choice the fundamental and practical rules on how to use these cables are established. The relate

20、d cables are specified in the documents issued by CLC/TC 46X and its sub-committees. These cables are: telecom cables used in access network, data communication twisted pairs cables, coaxial cables used in CATV. 2 Normative references The following documents, in whole or in part, are normatively ref

21、erenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 50083 (all parts), Cable networks for television signals, sound signa

22、ls and interactive services EN 50090 (all parts), Home and Building Electronic Systems (HBES) EN 50117 (all parts), Coaxial cables EN 50173 (all parts), Information technology Generic cabling systems EN 50174 (all parts), Information technology Cabling installation EN 50200, Method of test for resis

23、tance to fire of unprotected small cables for use in emergency circuits EN 50288 (all parts), Multi-element metallic cables used in analogue and digital communication and control EN 50289-1-3, Communication cables Specifications for test methods Part 1-3: Electrical test methods Dielectric strength

24、EN 50289-3-9, Communication cables Specifications for test methods Part 3-9: Mechanical test methods Bending tests EN 50289-4-16, Communication cables Specifications for test methods Part 4-16: Environmental test methods Circuit integrity under fire conditions EN 50290 (all parts), Communication cab

25、les EN 50406 (all parts), End user multi-pair cables used in high bit rate telecommunication networks EN 50407 (all parts), Multi-pair cables used in high bit rate digital access telecommunication networks EN 50441 (all parts), Cables for indoor residential telecommunication installations EN 50575,

26、Power, control and communication cables Cables for general applications in construction works subject to reaction to fire requirements 3 Communication cable basics Communication cables are the highways and arteries that provide a path for telecommunications devices. There is a general tendency to sa

27、y that one transmission medium is better than another. In fact, each transmission medium has its place in the design of any communication system. Each has BS EN 50290-4-2:2014- 5 - EN 50290-4-2:2014 characteristics that will make it the ideal medium to use based on a particular set of circumstances.

28、 It is important to recognize the advantages of each and develop a system accordingly. Factors to consider when choosing communication cable include: efficiency of transmission, cost, ease of installation and maintenance, availability. 4 Types of cables 4.1 General When working with communication ca

29、bles, an installer will deal with two basic types: balanced, unbalanced. Balanced cabling involve twisted-pair and/or twinaxial twisted cables that are composed of one or more pairs of copper wires (see Figure 1). Unbalanced cabling involves coaxial cable, that has only one centre conductor of eithe

30、r solid or stranded inner conductor and an outer concentric conductor. Most data and voice networks use twisted-pair cabling. Coaxial cable is now used primarily for CATV, satellite and video connections (see Figure 2). Figure 1 Balanced cabling Figure 2 Unbalanced cabling 4.2 Twisted pairs cables 4

31、.2.1 Pair construction There are two different pairing constructions: a pair made of two insulated wires twisted together (wire A and B in Figure 4); a quad made of four insulated wires twisted together, providing two pairs from a star formation (first pair wire A and B and second pair wire D and C

32、in Figure 3); a pair made of two insulated wires twisted together; a quad made of four insulated wires twisted together, providing two pairs. BS EN 50290-4-2:2014EN 50290-4-2:2014 - 6 - ADBCABFigure 3 Starquads Figure 4 Pairs 4.2.2 Pair counts Telecommunications cable comes in many sizes, starting w

33、ith a single pair of wires, up to and perhaps more than 4 200 pairs of wires. These pairs may be arranged in concentric layers or in bundles. A data communication terminal is fed normally with a maximum of 4 pairs, so the last part of the network is built with cables having 1 to 4 pairs. As the othe

34、r parts of the network aggregate several terminal cables, they have a larger number of pairs. The highest number of pairs is encountered at the main communication switch. The main communication switch is then connected to global systems by satellite, fibre, radio, waveguide and coaxial (CATV). The i

35、dentification of each pair in the cable is made through an appropriate colour code that is given in the relevant standard or may be agreed between customer and manufacturer (see Example in Figure 5). Figure 5 Example of pair arrangement in a telecommunication cable 4.3 Coaxial cable (unbalanced) Coa

36、xial cable is called coaxial because it includes one conductor surrounded by a layer of insulation, itself surrounded by a concentric conductor (a metallic foil or braid or a combination of both) and an outer sheath (see Figure 6). Coaxial cable is the primary type of communication cable used by cab

37、le TV companies for signal distribution between the community antenna (CATV, normally 75 ) and users homes and businesses. The WWW is now accessible through such communication mediums making possible all types of connections. It was once the primary medium for Ethernet and other types of local area

38、networks because of its ability to transmit high frequencies. With the development of standards for Ethernet over twisted-pair, new installations of coaxial cable for this purpose have all but disappeared. BS EN 50290-4-2:2014- 7 - EN 50290-4-2:2014 Coaxial cable is still used for connecting CCTV ca

39、meras to monitors, antennas and video switches. Cables for radio communication (mobile telephone) antennas are also coaxial, these are feeder cables and are normally 50 . Figure 6 Coaxial cable illustration There are several variations. Triaxial (Triax) is a form of cable that uses a single centre c

40、onductor with two shields (one could be tape and one braid). This is important when considering EMC (electromagnetic compatibility). This composition affords a greater transmission distance with less loss due to interference from outside electrical signals. Twinaxial (Twinax) is two coaxial systems

41、packaged within a single concentric outer conductor and jacket to form the cable. 4.4 Flexible cables versus rigid cables Communication infrastructure includes different sections. Some sections are installed, indoor or outdoor, permanently (i.e. fixed) so the cables are static (once installed, do no

42、t move) for their lifetime. Some other sections are subjected to continuous movement and different mechanical behaviour is required for the cable (see 7.6). Copper is inherently rigid and leads to build cables with a certain degree of stiffness suitable for permanent installations. However, copper i

43、s one of the most malleable of the rigid metals and so cannot be unsupported. Nonetheless, cable construction includes design to allow appropriate bending radius to be performed without degradation of mechanical and transmission properties. For some applications there is a need for smaller bending r

44、adius, multiple bending, or less stiffness while keeping requested transmission properties (i.e. work area cables or cables used in lift machinery). Specific designs to achieve this target use stranded conductors instead of one-solid-conductor; also with insulation material having specific mechanica

45、l properties are used. These cables, named “flexible cables”, are often used in cord assemblies and are specified for a given number of mechanical cycles. In order to provide more flexibility to cables used in cords, stranded conductors are used instead of solid conductors. Not only does this improv

46、e flexibility but also allows the cable to be repeatedly flexed many times; this can be useful in robotic systems. The relevant cable standards identifies whether the cable is either flexible or rigid, depending on how the cable will be used in its life cycle i.e. look for properties such as simulat

47、ed installation, torsion and twisting or flexing performance tests. These basic principles, along with avoiding already known stresses and misuses of installations, will ensure the cable does not irreversibly degrade below the performance criteria. There are many situations already known that will c

48、hange the performance criteria below that of the specified limits. Inner conductor BS EN 50290-4-2:2014EN 50290-4-2:2014 - 8 - 5 Cables and regulations 5.1 General In addition to functional requirements cables have to meet the essential requirements of European Directives like the LVD (Low Voltage D

49、irective) and the CPD (Construction Products Directive) and may have to contribute to the compliance of systems versus other directives like the EMCD (Electromagnetic Compatibility Directive). EN 50290-4-1 gives the relationship between cables and main European Directives by detailing the related cable characteristics and associated tests. 5.2 Low voltage Cables that are described into the documents issued by CLC/TC 46X and its sub-committees are tested for voltage withstanding. The t