prEN 50121-5:2025
(Main)Railway applications - Electromagnetic compatibility - Part 5: Emission and immunity of fixed power supply installations and apparatus
Railway applications - Electromagnetic compatibility - Part 5: Emission and immunity of fixed power supply installations and apparatus
This document applies to emission and immunity aspects of EMC for electrical and electronic apparatus and systems intended for use in railway power supply installations. This includes the power feed to the apparatus, the apparatus itself with its protective control circuits, trackside items such as switching stations, power autotransformers, booster transformers, substation power switchgear and power switchgear to other longitudinal and local supplies. NOTE 1: Filters operating at railway system voltage (for example, for harmonic suppression or power factor correction) are not included in this standard since each site has special requirements. Filters would normally have separate enclosures with separate rules for access. If electromagnetic limits are required, these will appear in the specification for the equipment. The frequency range considered is from DC to 400 GHz. No measurements need to be performed at frequencies where no requirement is specified. Emission and immunity limits are given for items of apparatus which are situated: a) within the boundary of a substation which delivers electric power to a railway; b) beside the track for the purpose of controlling or regulating the railway power supply, including power factor correction; c) along the track for the purpose of supplying electrical power to the railway other than by means of the conductors used for contact current collection, and associated return conductors. Included are high voltage feeder systems within the boundary of the railway which supply substations at which the voltage is reduced to the railway system voltage; d) beside the track for controlling or regulating electric power supplies to ancillary railway uses. This category includes power supplies to marshalling yards, maintenance depots and stations; e) various other non-traction power supplies from railway sources which are shared with railway traction.
Bahnanwendungen - Elektromagnetische Verträglichkeit - Teil 5: Störaussendungen und Störfestigkeit von ortsfesten Anlagen und Einrichtungen der Bahnenergieversorgung
Applications ferroviaires - Compatibilité électromagnétique - Partie 5 : Emission et immunité des installations fixes d'alimentation de puissance et des équipements associés
Železniške naprave - Elektromagnetna združljivost - 5. del: Sevanje in odpornost stabilnih močnostnih napajalnih inštalacij in naprav
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2025
Železniške naprave - Elektromagnetna združljivost - 5. del: Sevanje in odpornost
stabilnih močnostnih napajalnih inštalacij in naprav
Railway applications - Electromagnetic compatibility - Part 5: Emission and immunity of
fixed power supply installations and apparatus
Bahnanwendungen - Elektromagnetische Verträglichkeit - Teil 5: Störaussendungen und
Störfestigkeit von ortsfesten Anlagen und Einrichtungen der Bahnenergieversorgung
Applications ferroviaires - Compatibilité électromagnétique - Partie 5 : Emission et
immunité des installations fixes d'alimentation de puissance et des équipements
associés
Ta slovenski standard je istoveten z: prEN 50121-5:2025
ICS:
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
45.020 Železniška tehnika na Railway engineering in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD DRAFT
prEN 50121-5
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2025
ICS 29.280; 33.100.01; 45.020 Will supersede EN 50121-5:2017; EN 50121-
5:2017/A1:2019
English Version
Railway applications - Electromagnetic compatibility - Part 5:
Emission and immunity of fixed power supply installations and
apparatus
Applications ferroviaires - Compatibilité électromagnétique - Bahnanwendungen - Elektromagnetische Verträglichkeit -
Partie 5 : Emission et immunité des installations fixes Teil 5: Störaussendungen und Störfestigkeit von ortsfesten
d'alimentation de puissance et des équipements associés Anlagen und Einrichtungen der Bahnenergieversorgung
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2025-10-24.
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,
Türkiye 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
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 79751 Ref. No. prEN 50121-5:2025 E
1 Contents Page
2 European foreword . 3
3 Introduction . 5
4 1 Scope . 6
5 2 Normative references . 6
6 3 Terms definitions and abbreviations . 8
7 3.1 Terms and definitions . 8
8 3.2 Abbreviations . 9
9 4 Overall aspects .10
10 5 Emission .10
11 5.1 Emission from the substation to the outside world .10
12 5.2 Emission limits for apparatus .10
13 6 Immunity .16
14 6.1 Performance criteria.16
15 6.2 Immunity requirements .16
16 7 Fixed power supplies on railway property which are not used for railway traction
17 purposes .23
18 Bibliography .24
20 European foreword
21 This document (prEN 50121-5:2025) has been prepared by CLC/TC 9X “Electrical and electronic
22 applications for railways”.
23 This document is currently submitted to the Enquiry.
24 The following dates are proposed:
• latest date by which the existence of this (doa) dav + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dav + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dav + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
25 This document has been prepared according to Decision 69/09 taken during the TC 9X meeting.
26 This document will supersede EN 50121-5:2017.
27 prEN 50121-5:2025 includes the following significant technical changes with respect to
28 EN 50121-5:2017:
29 — update of Introduction;
30 — update of scope;
31 — update of normative references;
32 — update of terms and definitions and abbreviations;
33 — new structure with Clause 4: Overall aspects, Clause 5: Emission and Clause 6: Immunity;
34 — new headline of Clause 5.2, Emission limits for apparatus and introduction of new Tables 1 to 3;
35 — clarification of immunity requirements in Clause 6.2 and Update of Tables 4 to 8;
36 — merging of former Tables 2 and 3 into a new Table 5, immunity – I/O ports;
37 — deletion of Annex A;
38 — deletion of Annex ZZ.
39 This standard forms Part 5 of the European Standard series EN 50121, published under the general title
40 “Railway applications - Electromagnetic compatibility”. The series consists of:
41 — Part 1: General;
42 — Part 2: Emission of the whole railway system to the outside world;
43 — Part 3-1: Rolling stock – Train and complete vehicle;
44 — Part 3-2: Rolling stock – Apparatus;
45 — Part 4: Emission and immunity of the signalling and telecommunications apparatus;
46 — Part 5: Emission and immunity of fixed power supply installations and apparatus.
47 The specific provisions of this document are used in conjunction with the general provisions in
48 prEN 50121-1:2025.
49 Introduction
50 This document has been prepared in the form of a Product Standard.
51 It defines the immunity and emission test requirements for apparatus defined in the scope in relation to
52 the electromagnetic disturbances likely to be experienced in the railway. In particular, the test
53 requirements represent the essential electromagnetic immunity requirements and have been selected
54 to ensure an adequate level of immunity for apparatus installed on the railway locations.
55 Test requirements are specified for each port considered.
56 Safety considerations are not covered by this standard.
57 Emission requirements have been selected so as to ensure that disturbances generated by the
58 apparatus operated normally in railway environment do not exceed a level which could prevent other
59 apparatus from operating as intended.
60 Likewise, the immunity requirements have been selected so as to ensure an adequate level of immunity
61 of fixed power supply apparatus.
62 1 Scope
63 This document applies to electrical and electronic apparatus and systems intended for use in railway
64 fixed installations for power supply with railway function (e.g. not covered are equipment such as fire
65 detection devices installed inside substations, room access devices, air conditioning, lighting systems,
66 etc.). This includes the power feed to the apparatus, the apparatus itself with its protective control
67 circuits, trackside items such as switching stations, power substations for charging of battery on the
68 board of train (auxiliary charging points), power autotransformers, booster transformers, substation
69 power switchgear and power switchgear to other longitudinal and local supplies.
70 Emission and immunity limits are given for apparatus which are situated:
71 a) within the boundary of a substation which delivers electric power to a railway;
72 b) beside the track for the purpose of controlling or regulating the railway power supply, including
73 power factor correction;
74 c) along the track for the purpose of supplying electrical power to the railway other than by means of
75 the conductors used for contact current collection, and associated return conductors. Included are
76 high voltage feeder systems within the boundary of the railway which supply substations at which
77 the voltage is reduced to the railway system voltage;
78 d) beside the track for controlling or regulating electric power supplies to ancillary railway uses. This
79 category includes power supplies to marshalling yards, maintenance depots and stations;
80 e) various other non-traction power supplies from railway sources which are shared with railway
81 traction.
82 Note: Filters operating at railway system voltage (for example, for harmonic suppression or power factor
83 correction) are not included in this standard since each site has special requirements. Filters would
84 normally have separate enclosures with separate rules for access. If electromagnetic limits are required,
85 these will appear in the specification for the equipment.
86 This document specifies limits for emission and immunity and provides performance criteria.
87 The standard does not specify basic personal safety requirements for apparatus such as protection
88 against electric shock, unsafe operation, insulation co-ordination and related dielectric tests. The
89 requirements were developed for and are applicable to this set of apparatus when operating under
90 normal conditions. Fault conditions of the apparatus have not been taken into account.
91 The test frequency range defined in this document is considered to ensure the electromagnetic
92 compatibility of the apparatus in the whole frequency range from 0 Hz (DC) to 400 GHz.
93 2 Normative references
94 The following documents are referred to in the text in such a way that some or all of their content
95 constitutes requirements of this document. For dated references, only the edition cited applies. For
96 undated references, the latest edition of the referenced document (including any amendments) applies.
97 prEN 50121-1:2025, Railway applications - Electromagnetic compatibility - Part 1: General
98 prEN 50121-2:2025, Railway applications - Electromagnetic compatibility - Part 2: Emission of the whole
99 railway system to the outside world
100 EN IEC 55014-1:2021, Electromagnetic compatibility - Requirements for household appliances, electric
101 tools and similar apparatus - Part 1: Emission (CISPR 14-1:2020)
102 EN 55016-1-1:2019, Specification for radio disturbance and immunity measuring apparatus and
103 methods - Part 1-1: Radio disturbance and immunity measuring apparatus - Measuring apparatus
104 (CISPR 16-1-1:2019)
105 EN 55016-1-2:2014 , Specification for radio disturbance and immunity measuring apparatus and
106 methods - Part 1-2: Radio disturbance and immunity measuring apparatus - Coupling devices for
107 conducted disturbance measurements (CISPR 16-1-2:2014)
108 EN 55016-1-4:2019, Specification for radio disturbance and immunity measuring apparatus and
109 methods - Part 1-4: Radio disturbance and immunity measuring apparatus - Antennas and test sites for
110 radiated disturbance measurements (CISPR 16-1-4:2019)
111 EN 55016-1-6:2015 , Specification for radio disturbance and immunity measuring apparatus and
112 methods - Part 1-6: Radio disturbance and immunity measuring apparatus - EMC antenna calibration
113 (CISPR 16-1-6:2014)
114 EN 55016-2-1:2014 , Specification for radio disturbance and immunity measuring apparatus and
115 methods - Part 2-1: Methods of measurement of disturbances and immunity - Conducted disturbance
116 measurements (CISPR 16-2-1:2014)
117 EN 55016-2-3:2017 , Specification for radio disturbance and immunity measuring apparatus and
118 methods - Part 2-3: Methods of measurement of distu
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