1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsWB9423_BSI_StandardColCov_noK_AW:BSI FRONT COVERS 5/9/08 12:55 Page 1Resistibility requirements toovervoltages and overcurrentsdue to lightning for equipmenthaving telecommunicationp
2、ortsBS EN 50468:2009National forewordThis British Standard is the UK implementation of EN 50468:2009.The UK participation in its preparation was entrusted to Technical CommitteeGEL/81, Protection against lightning.A list of organizations represented on this committee can be obtained onrequest to its
3、 secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2009ISBN 978 0 580 56040 8ICS 29.120.50; 91.120.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Sta
4、ndard was published under the authority of the StandardsPolicy and Strategy Committee on 31 July 2009Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 50468:2009EUROPEAN STANDARD EN 50468 NORME EUROPENNE EUROPISCHE NORM April 2009 CENELEC European Committee for Elec
5、trotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: avenue Marnix 17, B - 1000 Brussels 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. N
6、o. EN 50468:2009 (fragment 60) E ICS 29.120.50; 91.120.40 English version Resistibility requirements to overvoltages and overcurrents due to lightning for equipment having telecommunication ports Exigences de tenue aux surtensions et aux surintensits dues la foudre pour les matriels avec port de com
7、munication Anforderungen zur Zerstrfestigkeit von Einrichtungen mit Telekommunikationsanschluss gegen berspannungen und -strme infolge Blitzschlags This European Standard was approved by CENELEC on 2009-02-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipul
8、ate 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 application to the Central Secretariat or to any CENELEC member. This European Standard
9、 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 has the same status as the official versions. CENELEC members are the national
10、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, Sw
11、itzerland and the United Kingdom. BS EN 50468:2009EN 50468:2009 2 Foreword This European Standard was prepared by the Technical Committee CENELEC TC 81X, Lightning protection. The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50468 on 2009-02-01. The following
12、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) 2010-02-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2012-02-01 _ BS EN 50468:2009 3 EN
13、50468:2009 Contents 1 Scope . 4 2 Normative references . 4 3 Terms, definitions and abbreviations 5 4 Reference configuration . 5 5 Resistibility requirements . 6 6 Resistibility test requirements . 6 6.1 For ports connected to balanced copper cabling 7 6.1.1 Lightning test conditions for ports conn
14、ected to external balanced copper cabling . 7 6.2 For ports connected to external d.c or a.c dedicated power feeding cables 8 6.2.1 Lightning test conditions for ports connected to external d.c or a.c dedicated power feeding cables . 8 6.3 For mains power ports . 8 6.3.1 Test conditions for mains po
15、wer ports . 8 Annex A (informative) ITU-T publications (K-recommendations) with relation to TE 10 Bibliography 11 Figures Figure 1 Equipment with telecommunication ports installed at customers premises 6 Figure 2 TE configurations . 9 Figure A.1 ITU-T publications (K-recommendations) with relation t
16、o TE . 10 BS EN 50468:2009EN 50468:2009 4 1 Scope This European Standard specifies the minimum level of resistibility of equipment having telecommunication port(s) to overvoltages and overcurrents. This European Standard covers telecommunication equipment installed at customer premises as shown in F
17、igure 1. Overvoltages or overcurrents covered by this European Standard are surges due to direct or indirect lightning on the telecommunication line plant. Overvoltages or overcurrent not covered by this European Standard are short-term induction of alternating voltages from electric power systems (
18、including electrified railway), earth potential rise due to power faults or load switching, direct contacts between telecommunication lines and low voltage power lines. This European Standard is intended for use by network (public/private) operators and the equipment manufacturers. This European Sta
19、ndard applies to equipment having telecommunication port(s) connected to external conductors, i.e. conductor located outside the customers building. The tests are type tests and, although they are applicable to a complete system, it is recognised that they may be applied to individual items of equip
20、ment during development and design work. 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 amendm
21、ents) applies. CLC/TR 50450:2006, Resistibility requirements for equipment having (a) telecommunication port(s) EN 60950-1:2006, Information technology equipment Safety Part 1: General requirements (IEC 60950-1:2005, mod.) IEC 60050-701:1988, International Electrotechnical Vocabulary (IEV) Chapter 7
22、01: Telecommunications, channels and networks ITU-T Recommendation K.21, Resistibility of telecommunication equipment installed in customer premises to overvoltages and overcurrents ITU-T Recommendation K.44, Resistibility tests for telecommunication equipment exposed to overvoltages and overcurrent
23、s Basic Recommendation BS EN 50468:2009 5 EN 50468:2009 3 Terms, definitions and abbreviations For the purposes of this document, the following terms and definitions apply, in addition with those definitions and abbreviations in ITU-T recommendation K.44. 3.1 resistibility ability of telecommunicati
24、on equipment or installations to withstand, in general without damage, the effects of overvoltages or overcurrents, up to a certain, specified extent, and in accordance with a specified criterion ITU-T K.44 NOTE Two acceptance criteria are recognized: Criterion A Equipment shall withstand the test w
25、ithout damage or other disturbance (such as corruption of software or misoperation of fault-protection facilities) and shall operate properly within the specified limits after the test. It is not required to operate correctly during the test. Criterion B A fire hazard shall not arise in the equipmen
26、t as a result of the tests. Any damage, if it occurs, shall be confined to a small part of the equipment. 3.2 telecommunication port port which is intended to be connected to telecommunication networks, Local Area Networks (e.g. Ethernet, Token Ring) and similar networks, either through physical con
27、nection (cable optical fibre) or radio connection CLC/TR 50450 NOTE In the latter case the antenna port is the telecommunication port. 3.3 external ports particular interface of the specified equipment, which is directly connected to metallic conductors extending beyond the building or shelter bound
28、ary ITU-T K.44 3.4 internal ports particular interface of the specified equipment which is connected to metallic conductors which do not leave the building or shelter. These interfaces connect to cables which interconnect system blocks ITU-T K.44 3.5 telecommunication any transmission, emission or r
29、eception of signs, signals, writing, images and sounds or intelligence of any nature by wire, radio, optical or other electromagnetic systems IEV 701-01-05 of IEC 60050-701:1988 4 Reference configuration The diagram below shows equipment with telecommunication port(s) installed at customers premises
30、. This ensures that the appropriate electromagnetic environment for the installation is considered, independent of the ownership of the equipment. BS EN 50468:2009EN 50468:2009 6 Figure 1 Equipment with telecommunication ports installed at customers premises 5 Resistibility requirements For equipmen
31、t having only external telecommunications ports the resistibility requirements are defined in ITU-T K.21, “Basic test level“. See also Figure 2, a). For equipment having additional connections to networks, e.g. power networks, the test levels are defined in ITU-T K.21, “Enhanced test level“. See als
32、o Figure 2, b) to e). The inherent resistibility of the equipment may not be sufficient by itself, requiring co-ordinated primary protection to be fitted to fully comply. NOTE For the external port, the probability of overvoltages and overcurrents on the equipment is determined by the length of the
33、line and the environment it is installed in, the environment outside of the structure, and the structure itself. 6 Resistibility test requirements An overview of the test conditions for the different ports is shown in 6.1 to 6.3. See also Figure 2 for identification of the ports. In Annex A is liste
34、d the relevant ITU specifications on this topic. The complete test requirements, test generators, test circuits, test conditions, coupling and decoupling elements and port terminations are provided in ITU-T K.21 and K.44. During test the level of overvoltages and overcurrents in untested ports shall
35、 not exceed the requirements in EN 60950-1. Gas discharge tubes with 600 V nominal d.c. spark-over voltage are used as special test protector in the co-ordination test on external telecommunication port(s). MNTNTTETEE MDFMetallic connectionNon metallic connectionMetallic connectionS1S3ES2 Key E Exch
36、ange building S Customers premises M Equipment e.g. Multiplexor NT Network Termination MDF Main Distribution Frame TE Terminal Equipment Radiolink BS EN 50468:2009 7 EN 50468:2009 6.1 For ports connected to balanced copper cabling 6.1.1 Lightning test conditions for ports connected to external balan
37、ced copper cabling Test No. Test No. ITU-T K.21 Test description ITU-T K.21 Basic test levels Enhanced test levels6.1.1.1 2.1.1.a Single port, lightning, inherent, transverse Uc(max)= 1,5 kV Uc(max)= 1,5 kV 6.1.1.2 2.1.1.b Single port, lightning, inherent, port to earth Uc(max)= 1,5 kV Uc(max)= 6 kV
38、 6.1.1.3 2.1.1.c Single port, lightning, inherent, port to external port Uc(max)= 1,5 kV Uc(max)= 6 kV 6.1.1.4 2.1.2.a Single port, lightning, coordination, transverse Uc(max)= 4 kV Uc(max)= 6 kV 6.1.1.5 2.1.2.b Single port, lightning, coordination, port to earth Uc(max)= 4 kV Uc(max)= 6 kV 6.1.1.6
39、2.1.2.c Single port, lightning, coordination, port to external port Uc(max)= 4 kV Uc(max)= 6 kV 6.1.1.7 2.1.3.a Multiple port, lightning, inherent, port to earth Uc(max)= 1,5 kV Uc(max)= 1,5 kV 6.1.1.8 2.1.3.b Multiple port, lightning, inherent, port to external port Uc(max) = 1,5 kV Uc(max)= 1,5 kV
40、 6.1.1.9 2.1.4.a Multiple port, lightning coordination, port to earth Uc(max)= 4 kV Uc(max)= 6 kV 6.1.1.10 2.1.4.b Multiple port, lightning coordination, port to external port Uc(max) = 4 kV Uc(max)= 6 kV 6.1.1.11 2.1.5.a Single port, lightning current, port to earth I = 1 kA/wire I = 5 kA/wire 6.1.
41、1.12 2.1.5.b Single port, lightning current, port to external port I = 1 kA/wire I = 5 kA/wire 6.1.1.13 2.1.6.a Multiple port, lightning current, port to earth I = 1 kA/wire Limited to 6 kA total I = 5 kA/wire Limited to 30 kA total 6.1.1.14 2.1.6.b Multiple port, lightning current, port to external
42、 port I = 1 kA/wire Limited to 6 kA total aI = 5 kA/wire Limited to 30 kA total aaPeak current is set by the weaker of the port under test and the external port coupled to ground. BS EN 50468:2009EN 50468:2009 8 6.2 For ports connected to external d.c or a.c dedicated power feeding cables 6.2.1 Ligh
43、tning test conditions for ports connected to external d.c or a.c dedicated power feeding cables Test No. Test No. ITU-T K.21 Test description ITU-T K.21 Basic test levels Enhanced test levels6.2.1.1 4.1.1.a Single port, lightning, inherent, transverse Uc(max)= 1,5 kV Uc(max)= 1,5 kV 6.2.1.2 4.1.1.b
44、Single port, lightning, inherent, port to earth Uc(max)= 1,5 kV Uc(max)= 6 kV 6.2.1.3 4.1.1.c Single port, lightning, inherent, port to external port Uc(max)= 1,5 kV Uc(max)= 6 kV 6.2.1.4 4.1.2.a Single port, lightning, coordination, transverse Uc(max)= 4 kV Uc(max)= 6 kV 6.2.1.5 4.1.2.b Single port
45、, lightning, coordination, port to earth Uc(max)= 4 kV Uc(max)= 6 kV 6.2.1.6 4.1.2.c Single port, lightning, coordination, port to external port Uc(max)= 4 kV Uc(max)= 6 kV 6.2.1.7 4.1.5.a Single port, lightning current, port to earth I = 1 kA/wire I = 5 kA/wire 6.2.1.8 4.1.5.b Single port, lightnin
46、g current, port to external port I = 1 kA/wire I = 5 kA/wire 6.3 For mains power ports 6.3.1 Test conditions for mains power ports Test No. Test No. ITU-T K.21 Test description ITU-T K.21 Basic test levels Enhanced test levels6.3.1.1 5.1.1.a Lightning, inherent, transverse Uc(max)= 2,5 kV Uc(max)= 6
47、 kV 6.3.1.2 5.1.1.b Lightning, inherent, port to earth Uc(max) = 2,5 kV Uc(max)= 6 kV 6.3.1.3 5.1.1.c Lightning, inherent, mains port to external port Uc(max)= 2,5 kV Uc(max)= 6 kV 6.3.1.4 5.1.2.a Lightning, coordination, transverse Uc(max)= 6 kV Uc(max)= 10 kV 6.3.1.5 5.1.2.b Lightning, coordinatio
48、n, port to earth Uc(max)= 6 kV Uc(max)= 10 kV 6.3.1.6 5.1.2.c Lightning, coordination, mains port to external port Uc(max)= 6 kV Uc(max)= 10 kV BS EN 50468:2009 9 EN 50468:2009 Key TE Terminal Equipment Figure 2 TE configurations (external) telecommunication port(s) (external) telecommunication port
49、(s) (external) telecommunication port(s) (external) telecommunication port(s) (external) telecommunication port(s) glasfibre; radio link (internal) telecommunication port(s) (internal) telecommunication port(s) (internal) telecommunication port(s) TE TE TE TE TE mains / power feed mains / power feed mains / power feed c) d) b) a) e) BS EN 50468:2009EN 50468:2009 10 Annex A (informative) ITU-T publications (K-recommendations) with relation to TE Lightning protection Lightni
