EN 50468:2009

SLOVENSKI STANDARD
01-oktober-2009
Zahteve za odpornost opreme s telekomunikacijskim vhodom proti prenapetosti in
nadtokovom zaradi delovanja strele
Resistibility requirements to overvoltages and overcurrents due to lightning for equipment
having telecommunication port
Anforderungen zur Zerstörfestigkeit von Einrichtungen mit
Telekommunikationsanschluss gegen Überspannungen und -ströme infolge Blitzschlags
Exigences de tenue aux surtensions et aux surintensités dues à la foudre pour les
matériels de communication avec port
Ta slovenski standard je istoveten z: EN 50468:2009
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
91.120.40 =DãþLWDSUHGVWUHOR Lightning protection
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 50468
NORME EUROPÉENNE
April 2009
EUROPÄISCHE NORM
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  Anforderungen zur Zerstörfestigkeit
aux surtensions et aux surintensités von Einrichtungen
dues à la foudre pour les matériels mit Telekommunikationsanschluss
avec port de communication gegen Überspannungen
und -ströme 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 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
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 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.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für 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. No. EN 50468:2009 (fragment 60) E

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 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
__________
– 3 – EN 50468:2009
Contents
1 Sc op e . . 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 connected 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 power 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 to TE . 10

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 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 overcurrent not covered by this European Standard are
– short-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 European 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 customer’s 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 equipment 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 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: General requirements
(IEC 60950-1:2005, mod.)
IEC 60050-701:1988, International Electrotechnical Vocabulary (IEV) – Chapter 701:
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 overcurrents – Basic Recommendation

– 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 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 criterion
[ITU-T K.44]
NOTE Two acceptance 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 during 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.
3.2
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 connection (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 boundary
[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
telecommunica
...