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1、BS EN 50468:2009BSI British StandardsResistibility requirements to overvoltages and overcurrents due to lightning for equipment having telecommunication portsNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWraising standards worldwideBS EN 50468:2009BRITISH STANDARDNational fore
2、wordThis 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 on request to its secretary.This publication does
3、 not purport to include all the necessary provisions of a contract. 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 from legal obligations.This British Standard was published under the
4、authority of the StandardsPolicy and Strategy Committee on 31 July 2009Amendments issued since publicationAmd. No. Date Text affectedBS EN 50468:2009EUROPEAN STANDARDEN 50468NORME EUROPENNEEUROPISCHE NORM April 2009 ICS 29.120.50; 91.120.40English versionResistibility requirements to overvoltages an
5、d overcurrents due to lightning for equipment having telecommunication portsExigences de tenueaux surtensions et aux surintensits dues la foudre pour les matriels avec port de communicationAnforderungen zur Zerstrfestigkeit von Einrichtungenmit Telekommunikationsanschluss gegen berspannungenund -str
6、me infolge BlitzschlagsThis European Standard was approved by CENELEC on 2009-02-01. 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 list
7、s 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, German). A version in any other language made by translation under the res
8、ponsibility 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, German
9、y, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.CENELECEuropean Committee for Electrotechnical Standardization Comit Europen de Normalisation E
10、lectrotechnique Europisches Komitee fr Elektrotechnische NormungCentral 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. No. EN 50468:2009 (fragment 60) EForewordThis European Standard w
11、as 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 dates were fixed:latest date by which the EN has to be implemented at national level by publication o
12、f an identicalnational standard or by endorsement(dop)2010-02-01latest date by which the national standards conflictingwith the EN have to be withdrawn(dow)2012-02-01BS EN 50468:2009EN 50468:2009 11 Contents1Scope . 42Normative references . 43Terms, definitions and abbreviations . 54Reference config
13、uration . 55Resistibility requirements . 66Resistibility test requirements . 66.1For ports connected to balanced copper cabling . 76.1.1Lightning test conditions for ports connected to external balancedcopper cabling . 76.2For ports connected to external d.c or a.c dedicated power feeding cables. 86
14、.2.1Lightning test conditions for ports connected to external d.c or a.cdedicated power feeding cables . 86.3For mains power ports . 86.3.1Test conditions for mains power ports . 8Annex A (informative) ITU-T publications (K-recommendations) with relation to TE. 10Bibliography. 11FiguresFigure 1 Equi
15、pment with telecommunication ports installed at customers premises . 6Figure 2 TE configurations . 9Figure A.1 ITU-T publications (K-recommendations) with relation to TE . 101ScopeThis European Standard specifies the minimum level of resistibility of equipment having telecommunication port(s) to ove
16、rvoltages and overcurrents.This European Standard covers telecommunication equipment installed at customer premises as shown in Figure 1.Overvoltages or overcurrents covered by this European Standard are surges due to direct or indirect lightning on the telecommunication line plant.Overvoltages or o
17、vercurrent not covered by this European Standard areshort-term induction of alternating voltages from electric power systems (including electrified railway),earth potential rise due to power faults or load switching,direct contacts between telecommunication lines and low voltage power lines.This Eur
18、opean Standard is intended for use by network (public/private) operators and the equipment manufacturers.This European Standard 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,
19、although they are applicable to a complete system, it is recognised that they may be applied to individual items of equipment during development and design work.2Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only
20、the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.CLC/TR 50450:2006, Resistibility requirements for equipment having (a) telecommunication port(s) EN 60950-1:2006, Information technology equipment Safety Part 1: Genera
21、l requirements(IEC 60950-1:2005, mod.)IEC 60050-701:1988, International Electrotechnical Vocabulary (IEV) Chapter 701: Telecommunications, channels and networksITU-T Recommendation K.21, Resistibility of telecommunication equipment installed in customer premises to overvoltages and overcurrentsITU-T
22、 Recommendation K.44, Resistibility tests for telecommunication equipment exposed to overvoltages and overcurrents Basic Recommendation3Terms, definitions and abbreviationsFor the purposes of this document, the following terms and definitions apply, in addition with those definitions and abbreviatio
23、ns in ITU-T recommendation K.44.3.1 resistibilityability of telecommunication 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 criterionITU-T K.44NOTE Two acceptance
24、criteria are recognized:Criterion A Equipment shall withstand the test without 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 du
25、ring the test.Criterion B A fire hazard shall not arise in the equipment as a result of the tests. Any damage, if it occurs, shall be confined to a small part of the equipment.3.2telecommunication portport which is intended to be connected to telecommunication networks, Local Area Networks (e.g. Eth
26、ernet, Token Ring) and similar networks, either through physical connection (cable optical fibre) or radio connectionCLC/TR 50450NOTE In the latter case the antenna port is the telecommunication port.3.3external portsparticular interface of the specified equipment, which is directly connected to met
27、allic conductors extending beyond the building or shelter boundaryITU-T K.443.4internal portsparticular 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 blocksITU-T
28、K.443.5 telecommunicationany transmission, emission or reception of signs, signals, writing, images and sounds or intelligence of any nature by wire, radio, optical or other electromagnetic systemsIEV 701-01-05 of IEC 60050-701:19884Reference configurationThe diagram below shows equipment with telec
29、ommunication port(s) installed at customers premises. This ensures that the appropriate electromagnetic environment for the installation is considered, independent of the ownership of the equipment.ES1EMDFMetallic connectionNT MNon metallic connectionMetallic connectionS3S2Radio linkKeyEExchange bui
30、ldingTESCustomers premisesMEquipment e.g. MultiplexorNTNTNetwork TerminationTEMDF Main Distribution FrameTETerminal EquipmentFigure 1 Equipment with telecommunication ports installed at customers premises5Resistibility requirementsFor equipment having only external telecommunications ports the resis
31、tibility 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 also Figure 2, b) to e).The inherent resistibility of the equipme
32、nt 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 line and the environment it is installed in, the environment out
33、side of the structure, and the structure itself.6Resistibility test requirementsAn 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 listed the relevant ITU specifications on this topic.The complete test r
34、equirements, 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 not exceed the requirements in EN 60950-1.Gas discharge tubes with 6
35、00 V nominal d.c. spark-over voltage are used as special test protector in the co-ordination test on external telecommunication port(s).6.1For ports connected to balanced copper cabling6.1.1Lightning test conditions for ports connected to external balanced copper cablingTest No.Test No. ITU-T K.21Te
36、st descriptionITU-T K.21Basic test levelsEnhanced test levels6.1.1.12.1.1.aSingle port, lightning, inherent, transverseUc(max) = 1,5 kVUc(max) = 1,5 kV6.1.1.22.1.1.bSingle port, lightning, inherent, port to earthUc(max) = 1,5 kVUc(max) = 6 kV6.1.1.32.1.1.cSingle port, lightning, inherent, port to ex
37、ternal portUc(max) = 1,5 kVUc(max) = 6 kV6.1.1.42.1.2.aSingle port, lightning, coordination, transverseUc(max) = 4 kVUc(max) = 6 kV6.1.1.52.1.2.bSingle port, lightning, coordination, port to earthUc(max) = 4 kVUc(max) = 6 kV6.1.1.62.1.2.cSingle port, lightning, coordination, port to external portUc(
38、max) = 4 kVUc(max) = 6 kV6.1.1.72.1.3.aMultiple port, lightning, inherent, port to earthUc(max) = 1,5 kVUc(max) = 1,5 kV6.1.1.82.1.3.bMultiple port, lightning, inherent, port to external portUc(max) = 1,5 kVUc(max) = 1,5 kV6.1.1.92.1.4.aMultiple port, lightning coordination, port to earthUc(max) = 4
39、 kVUc(max) = 6 kV6.1.1.102.1.4.bMultiple port, lightning coordination, port to external portUc(max) = 4 kVUc(max) = 6 kV6.1.1.112.1.5.aSingle port, lightning current, port to earthI = 1 kA/wireI = 5 kA/wire6.1.1.122.1.5.bSingle port, lightning current, port to external portI = 1 kA/wireI = 5 kA/wire
40、6.1.1.132.1.6.aMultiple port, lightning current, port to earthI = 1 kA/wireLimited to 6 kA totalI = 5 kA/wireLimited to 30 kA total6.1.1.142.1.6.bMultiple port, lightning current, port to external portI = 1 kA/wireLimited to 6 kA total aI = 5 kA/wireLimited to 30 kA total aaPeak current is set by th
41、e weaker of the port under test and the external port coupled to ground.6.2For ports connected to external d.c or a.c dedicated power feeding cables6.2.1Lightning test conditions for ports connected to external d.c or a.c dedicated power feeding cablesTest No.Test No. ITU-T K.21Test descriptionITU-T
42、 K.21Basic test levelsEnhanced test levels6.2.1.14.1.1.aSingle port, lightning, inherent, transverseUc(max) = 1,5 kVUc(max) = 1,5 kV6.2.1.24.1.1.bSingle port, lightning, inherent, port to earthUc(max) = 1,5 kVUc(max) = 6 kV6.2.1.34.1.1.cSingle port, lightning, inherent, port to external portUc(max) = 1,5 kVUc(max) = 6 kV6.2.1.44.1.2.aSingle port, ligh
