FprEN 50121-4

SLOVENSKI STANDARD
oSIST prEN 50121-4:2021
01-julij-2021
Železniške naprave - Elektromagnetna združljivost - 4. del: Sevanje in odpornost
signalnih in telekomunikacijskih naprav
Railway applications - Electromagnetic compatibility - Part 4: Emission and immunity of
the signalling and telecommunications apparatus
Bahnanwendungen - Elektromagnetische Verträglichkeit - Teil 4: Störaussendungen und
Störfestigkeit von Signal- und Telekommunikationseinrichtungen
Applications ferroviaires - Compatibilité électromagnétique - Partie 4: Emission et
immunité des appareils de signalisation et de télécommunication
Ta slovenski standard je istoveten z: prEN 50121-4:2021
ICS:
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
45.020 Železniška tehnika na Railway engineering in
splošno general
oSIST prEN 50121-4:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 50121-4:2021
oSIST prEN 50121-4:2021
EUROPEAN STANDARD DRAFT
prEN 50121-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2021
ICS  Will supersede EN 50121-4:2016 and all of its
amendments and corrigenda (if any)
English Version
Railway applications - Electromagnetic compatibility - Part 4:
Emission and immunity of the signalling and telecommunications
apparatus
Applications ferroviaires - Compatibilité électromagnétique - Bahnanwendungen - Elektromagnetische Verträglichkeit -
Partie 4: Emission et immunité des appareils de Teil 4: Störaussendungen und Störfestigkeit von Signal-
signalisation et de télécommunication und Telekommunikationseinrichtungen
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2021-10-15.

It has been drawn up by CLC/TC 9X.

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 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

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.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 73231 Ref. No. prEN 50121-4:2021 E

oSIST prEN 50121-4:2021
prEN 50121-4:2021 (E)
Contents
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms, definitions and abbreviations . 6
4 Description of location . 7
5 Emission limits for apparatus . 7
6 Immunity . 9
Annex ZZ (informative) Relationship between this European standard and the essential
requirements of Directive 2014/30/EU [2014 OJ L96] aimed to be covered . 17
Bibliography . 18

oSIST prEN 50121-4:2021
prEN 50121-4:2021 (E)
European foreword
This document (prEN 50121-4:2021) has been prepared by CLC/TC 9X “Electrical and electronic
applications for railways”.
The following dates are proposed:
• latest date by which the existence of this (doa) dor + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)

This document will supersede EN 50121-4:2016 and all of its amendments and corrigenda (if any).
prEN 50121-4:2021 includes the following significant technical changes with respect to
EN 50121-4:2016:
— clarification of scope (Clause 1);
— set dated normative references (Clause 2);
— Update of Clause 5;
— Introduction of performance criteria (Clause 6.1);
— Update of Clause 6.2, paragraph from Clause 1 was introduced;
— revision of Annex ZZ.
This European Standard is read in conjunction with EN 50121-1.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association, and supports essential requirements of EU Directive(s).
For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this
document.
This standard forms Part 4 of the European Standard series EN 50121, published under the general
title “Railway applications - Electromagnetic compatibility”. The series consists of:
— Part 1: General;
— Part 2: Emission of the whole railway system to the outside world;
— Part 3-1: Rolling stock – Train and complete vehicle;
— Part 3-2: Rolling stock – Apparatus;
— Part 4: Emission and immunity of the signalling and telecommunications apparatus;
— Part 5: Emission and immunity of fixed power supply installations and apparatus.

oSIST prEN 50121-4:2021
prEN 50121-4:2021 (E)
Introduction
This document has been prepared in the form of a Product Standard.
It defines the immunity and emission test requirements for apparatus defined in the scope in relation to
the electromagnetic disturbances likely to be experienced in the railway. In particular, the test
requirements represent the essential electromagnetic immunity requirements and have been selected
to ensure an adequate level of immunity for apparatus installed on the railway locations.
Test requirements are specified for each port considered.
Safety considerations are not covered by this document.
In specific situations, where the level of disturbances may exceed the levels considered in this
standard, e.g. at a special location or where a hand-held transmitter is used in very close proximity to
an apparatus, special mitigation measures may have to be employed.

oSIST prEN 50121-4:2021
prEN 50121-4:2021 (E)
1 Scope
This document applies to railway signalling and telecommunication apparatus. Signalling and
telecommunication apparatus mounted in vehicles is covered by prEN 50121-3-2:2021, signalling and
telecommunication apparatus installed inside the substation and connected to substation equipment is
covered by prEN 50121-5:2021.
This document specifies limits for emission and immunity and provides performance criteria for
signalling and telecommunications (S&T) apparatus (including power supply systems belonging to
S&T) which may interfere with other apparatus inside the railway environment, or increase the total
emissions for the railway environment and so risk causing Electro-Magnetic Interference (EMI) to
apparatus outside the railway system.
The document does not specify basic personal safety requirements for apparatus such as protection
against electric shock, unsafe operation, insulation co-ordination and related dielectric tests. The
requirements were developed for and are applicable to this set of apparatus when operating under
normal conditions. Fault conditions of the apparatus have not been taken into account.
The frequency range considered is from DC to 400 GHz. No measurements need to be performed at
frequencies where no requirement is specified.
For products in the scope of EN 61000-3-2, EN 61000-3-3, EN 61000-3-11 or EN 61000-3-12 the
requirements of those document also apply.
These specific provisions are to be used in conjunction with the general provisions in
EN 50121-1:2016.
The immunity and emission levels do not of themselves guarantee that the integration of apparatus will
necessarily be satisfactory. The document cannot cover all the possible configurations of the
apparatus, but the test levels are sufficient to achieve satisfactory EMC in the majority of cases.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 50121-1:2017, Railway applications - Electromagnetic compatibility - Part 1: General
EN 55016-2-1:2014, Specification for radio disturbance and immunity measuring apparatus and
methods - Part 2-1: Methods of measurement of disturbances and immunity - Conducted disturbance
measurements
EN 61000-4-2:2009, Electromagnetic compatibility (EMC) - Part 4-2: Testing and measurement
techniques - Electrostatic discharge immunity test
EN 61000-4-3:2006, Electromagnetic compatibility (EMC) - Part 4-3: Testing and measurement
techniques - Radiated, radio-frequency, electromagnetic field immunity test
EN 61000-4-4:2012, Electromagnetic compatibility (EMC) - Part 4-4: Testing and measurement
techniques - Electrical fast transient/burst immunity test
EN 61000-4-5:2014, Electromagnetic compatibility (EMC) - Part 4-5: Testing and measurement
techniques - Surge immunity test
EN 61000-4-6:2014, Electromagnetic compatibility (EMC) - Part 4-6: Testing and measurement
techniques - Immunity to conducted disturbances, induced by radio-frequency fields
EN 61000-4-8:2010, Electromagnetic compatibility (EMC) - Part 4-8: Testing and measurement
techniques - Power frequency magnetic field immunity test

oSIST prEN 50121-4:2021
prEN 50121-4:2021 (E)
EN IEC 61000-6-4:2019, Electromagnetic compatibility (EMC) - Part 6-4: Generic standards - Emission
standard for industrial environments
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1.1
port
particular interface of the specified apparatus with the external environment
EXAMPLE AC power port, DC power port, I/O (input/output) port, earth port.
[SOURCE: IEC 60050-821: CDV2015, 821-11-36]
3.1.2
enclosure port
physical boundary of the apparatus through which electromagnetic fields may radiate or impinge

Enclosure port
AC power port  I/O port
DC power port APPARATUS earth port

Figure 1 — Main categories of ports
3.1.3
3 m zone
area along the railway line within a distance of 3 m from the centreline of the nearest track at both
sides of the track
3.1.4
10 m zone
area along the railway line within a distance of 10 m from the centreline of the nearest track at both
sides of the track
oSIST prEN 50121-4:2021
prEN 50121-4:2021 (E)
3.2 Abbreviations
AC Alternating current
AM Amplitude modulation
DC Direct current
EMC Electromagnetic compatibility
EMI Electromagnetic interference
I/O Input / Output
ITU International Telegraph Union
S&T Signalling and telecommunication
4 Description of location
The railway environment is characterized as described in EN 50121-1:2017.
5 Emission limits for apparatus
The emission tests and limits for apparatus covered by this standard are given on a port by port basis.
Measurements shall be performed in well-defined and reproducible conditions for each type of
disturbance.
The radiated emission limits defined for enclosure port in EN IEC 61000-6-4:2019, Table 3 shall be
complied with. The description of the test, the test methods and the test set-up are given in Basic
Standards which are referred to in EN IEC 61000-6-4.
The description of the conducted emission tests, the test methods and the test set-up are given in
Basic Standards which are referred to in Table 1.
The conducted emission limits shall apply to both AC and DC power ports. Where the apparatus is
intended to be used in an environment other than the railway environment, then the emission limits
given in the appropriate standards shall apply.

oSIST prEN 50121-4:2021
prEN 50121-4:2021 (E)
Table 1 — Emission — AC or DC power ports (input and output)
Test Basic Test Applicability
Port Remarks
specification Standard set-up note
a
1.1 AC or DC power 150 kHz to 79 dBμV quasi- EN 55016-2-1 EN 55016-2-1 See
500 kHz peak
ports
...