07-30154013-DC.pdf
a Date: 17 April 2007 Origin: European Latest date for receipt of comments: 31 July 2007 Project no.: 2006/02086 Responsible committee: EPL/46 Cables, wires and waveguides, radio frequency connectors and accessories for communication and signalling Interested committees: Title: Draft BS EN 50290-4-2 Communication cables - Part 4-2: General considerations for the use of cables - Guide for use Supersession information: If this document is published as a standard, the UK implementation of it will supersede NONE and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (contact details below). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 31 July 2007. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent. See overleaf for information on commenting. No copying is allowed, in any form, without prior written permission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. Electronic circulation is limited to dissemination by e-mail within such an organization by committee members. Further copies of this draft may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email ordersbsi-global.com. British, International and foreign standards are also available from BSI Customer Services. British Standards on CD or Online are available from British Standards Publishing Sales Limited. Tel: 01344 404409 or email bsonlinetechindex.co.uk. Information on the co-operating organizations represented on the committees referenced above may be obtained from the responsible committee secretary. Cross-references The British Standards which implement International or European publications referred to in this draft may be found via the British Standards Online Service on the BSI web site http:/www.bsi-global.com. Direct tel: 0208 996 7281 Responsible Committee Secretary: Mr S Bounds (BSI) E-mail: simon.boundsbsi-global.com Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 7.0 DPC: 07/30154013 DC Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:39:35 GMT+00:00 2007, Uncontrolled Copy, (c) BSI b Introduction This draft standard is based on European discussions in which the UK took an active part. Your comments on this draft are welcome and will assist in the preparation of the consequent British Standard. If no comments are received to the contrary, then the UK will approve this draft and implement it as a British Standard. Comment is particularly welcome on national legislative or similar deviations that may be necessary. Even if this draft standard is not approved by the UK, if it receives the necessary support in Europe, the UK will be obliged to publish the official English Language text unchanged as a British Standard and to withdraw any conflicting standard. UK Vote Please indicate whether you consider the UK should submit a negative (with reasons) or positive vote on this draft. Submission The guidance given below is intended to ensure that all comments receive efficient and appropriate attention by the responsible BSI committee. Annotated drafts are not acceptable and will be rejected. All comments must be submitted, preferably electronically, to the Responsible Committee Secretary at the address given on the front cover. Comments should be compatible with Version 6.0 or Version 97 of Microsoft® Word for Windows, if possible; otherwise comments in ASCII text format are acceptable. Any comments not submitted electronically should still adhere to these format requirements. All comments submitted should be presented as given in the example below. Further information on submitting comments and how to obtain a blank electronic version of a comment form are available from the BSI web site at: http:/www.bsi-global.com/en/Standards-and-Publications/Current-work/DPCs/ Template for comments and secretariat observations Date: xx/xx/200x Document: ISO/DIS xxxxx 1 2 (3) 4 5 (6) (7) MB Clause No./ Subclause No./ Annex (e.g. 3.1) Paragraph/ Figure/Table/ Note (e.g. Table 1) Type of com- ment Comment (justification for change) by the MB Proposed change by the MB Secretariat observations on each comment submitted 3.1 Definition 1 ed Definition is ambiguous and needs clarifying. Amend to read . so that the mains connector to which no connection . 6.4 Paragraph 2 te The use of the UV photometer as an alternative cannot be supported as serious problems have been encountered in its use in the UK. Delete reference to UV photometer. Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Corporation. Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:39:35 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Draft for vote FINAL DRAFT EUROPEAN STANDARD prEN 50290-4-2 NORME EUROPÉENNE EUROPÄISCHE NORM April 2007 CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels © 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Project: 11553 Ref. No. prEN 50290-4-2:2007 E ICS English version Communication cables - Part 4-2: General considerations for the use of cables - Guide to use Câbles de communication - Partie 4-2: Considérations générales pour l'utilisation des câbles - Guide d'utilisation Kommunikationskabel - Teil 4-2: Allgemeine Betrachtungen für die Anwendung der Kabel - Leitfaden für die Verwendung This draft European Standard is submitted to CENELEC members for Unique Acceptance Procedure. Deadline for CENELEC: 2007-09-14. It has been drawn up by CLC/TC 46X. If this draft becomes a European Standard, 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. This draft European Standard was established by CENELEC 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 has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard. Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:39:35 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Draft for vote prEN 50290-4-2:2007 - 2 - Foreword This draft European Standard was prepared by the Technical Committee CENELEC TC 46X, Communication cables, with the help of the CENELEC Co-operating Partner EUROPACABLE (ECBL). It is submitted to the Unique Acceptance Procedure. The following dates are proposed: latest date by which the existence of the EN has to be announced at national level (doa) dor + 6 months latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) dor + 12 months latest date by which the national standards conflicting with the EN have to be withdrawn (dow) dor + 36 months (to be confirmed or modified when voting) _ Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:39:35 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Draft for vote - 3 - prEN 50290-4-2:2007 Contents 1 Scope 5 2 Normative references . 5 3 Copper cable basics. 5 4 Types of cables 6 4.1 Twisted pairs cables 7 4.2 Coaxial Cable . 8 4.3 Flexible cables versus rigid cables: . 9 5 Cables and regulations. 9 5.1 Fire reactions and Euroclasses10 5.2 Electromagnetic behaviour 11 5.3 Low voltage .10 6 Criteria for the choice of the cables.14 6.1 Cable construction14 6.2 Cabling16 6.3 Transmission performance: .16 7 Installation practices.18 7.1 Delivery.18 7.2 Storage .18 7.3 Pre-installation procedure .19 7.4 Pulling of the cable.20 7.5 Installation.20 7.6 Mechanical considerations 20 8 Cabling installation versus location.25 8.1 Outside Plant.25 8.2 Intrabuilding.28 Figure 1 Balanced cabling. 6 Figure 2 Unbalanced cabling. 6 Figure 3 Starquads 7 Figure 4 Pairs 7 Figure 5 Example of pair arrangement in a telecommunication cable. 8 Figure 6 Coaxial cable illustration 8 Figure 7 Twisted pairs cables Screen description.13 Figure 8 Reel of cables.18 Figure 9 Reel storage.19 Figure 10 Advised way for pulling a cable.20 Figure 11 Tensile strength21 Figure 12 Shrinkage and elongation of Internal and external element .21 Figure 13 Common handling mistakes when bending cables22 Figure 14 Crush and impact testing23 Figure 15 Cable stapling.24 Figure 16 Cable buried in a trench25 Figure 17 Cable buried in a trench with a warning tape.26 Figure 18 Conduit for underground burial26 Figure 19 Example of an aerial cable installation 27 Figure 20 Cable messenger27 Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:39:35 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Draft for vote prEN 50290-4-2:2007 - 4 - Figure 21 Examples of installation of intrabuilding conduits.28 Figure 22 Example of mistake in pulling cables in conduits.30 Figure 23 External pulling grip31 Figure 24 Advised way for pulling a cable.31 Figure 25 Example of cable pulling when a mechanical force is required 32 Table 1 Types of cabling according to applications.16 Table 2 Cables for CATV/ MATV/ TV and Video distribution .17 Table 3 Cables for access network.17 Table 4 Cables that might be used for some given applications 18 Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:39:35 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Draft for vote - 5 - prEN 50290-4-2:2007 1 Scope The scope of this European Standard is to help installers and cabling designers to understand the range of communication copper cables available. To help this choice the fundamental and practical rules on how to use these cables are established The related cables are specified in the documents issued by CLC/TC 46X and it 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 referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 50117 Series Coaxial cables EN 50290 Series Communication cables EN 50288 Series Multi-element metallic cables used in analogue and digital communication and control EN 50441 Series Cables for indoor residential telecommunication installations EN 50406 Series End user multi-pair cables used in high bit rate telecommunication networks EN 50407-1 Multi-pair cables used in high bit rate digital access telecommunication networks - Part 1: Outdoor cables EN 61935-1 Testing of balanced communication cabling in accordance with standards series EN 50173 - Part 1: Installed cabling EN 50289-4-16 1) Communication cables - Specifications for test methods - Part 4-16: Environmental test methods - Circuit integrity under fire conditions 3 Copper cable basics Communication cables are the highways and arteries that provide a path for telecommunications devices. There is a general tendency to say 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 characteristics that will make it the ideal medium to use based on a particular set of circumstances. It is important to recognize the advantages of each and develop a system accordingly. 1) At draft stage. Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:39:35 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Draft for vote prEN 50290-4-2:2007 - 6 - Factors to consider when choosing communication cable include: - efficiency of transmission, - cost, - ease of installation and maintenance, - availability. 4 Types of cables When working with copper wire, an installer will deal with two basic types of cabling: - 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 involve coaxial cable, that has only one centre conductor of either solid or stranded copper wire 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 Licensed Copy: London South Bank University, London South Bank University, Mon May 07 12:39:35 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Draft for vote - 7 - prEN 50290-4-2:2007 4.1 Twisted pairs cables 4.1.1 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 in Figure 3); - a pair made of two insulated wires twisted together; - a quad made of four insulated wires twisted together, providing two pairs. A D B C A B Figure 3 Starquads Figure 4 Pairs 4.1.2 Pair counts Telecommunications cable comes in many sizes, starting with 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 other 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 s
