kSIST FprEN 50121-5:2026

• Abstract:

  This document applies to electrical and electronic apparatus and systems intended for use in railway fixed installations for power supply with railway function (e.g. not covered are equipment such as fire detection devices installed inside substations, room access devices, air conditioning, lighting systems, etc.). This includes the power feed to the apparatus, the apparatus itself with its protective control circuits, trackside items such as switching stations, power substations for charging of battery on the board of train (auxiliary charging points), power autotransformers, booster transformers, substation power switchgear and power switchgear to other longitudinal and local supplies.; Emission and immunity limits are given for 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) 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;; d) various other non-traction power supplies from railway sources which are shared with railway traction.; NOTE Filters operating at railway system voltage (for example, for harmonic suppression or power factor correction) are not included in this document 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.; This document specifies limits for emission and immunity and provides performance criteria.; 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 test frequency range defined in this document is considered to ensure the electromagnetic compatibility of the apparatus in the whole frequency range from 0 Hz (DC) to 400 GHz.

• Status: Not Published
• Public Enquiry End Date: 30-Sep-2025
• ICS: 29.280 - Electric traction equipment
• ICS: 33.100.01 - Electromagnetic compatibility in general
• ICS: 45.020 - Railway engineering in general
• Technical Committee: ŽEN - Electrical applications for railways
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 09-Sep-2026
• Due Date: 28-Oct-2026
• Completion Date: 09-Sep-2026
• Ref Project: FprEN 50121-5:2026 - Railway applications - Electromagnetic compatibility - Part 5: Emission and immunity of fixed power supply installations and apparatus

• Revises: SIST EN 50121-5:2017 - Railway applications - Electromagnetic compatibility - Part 5: Emission and immunity of fixed power supply installations and apparatus
• Effective Date: 09-Apr-2024
• Revises: SIST EN 50121-5:2017/A1:2020 - Railway applications - Electromagnetic compatibility - Part 5: Emission and immunity of fixed power supply installations and apparatus
• Effective Date: 09-Apr-2024

kSIST FprEN 50121-5:2026 is a CENELEC draft European Standard for railway electromagnetic compatibility. It specifies emission limits, immunity limits, and performance criteria for electrical and electronic apparatus and systems used in fixed railway power-supply installations. Engineers, test laboratories, system suppliers, and buyers use it to check EMC behavior for substations, trackside power equipment, and related railway power-supply apparatus.

What does kSIST FprEN 50121-5:2026 specify?

kSIST FprEN 50121-5:2026 applies to railway fixed power-supply installations and apparatus with a railway function. It sets the EMC framework for equipment used in and around substations, trackside control and regulation points, ancillary railway power supplies, and other railway-source supplies shared with traction.

Clause / table	What it covers
Clause 1	Scope and application areas
Clause 2	Normative references
Clause 3	Terms, definitions, and abbreviations
Clause 4	Overall aspects and test planning
Clause 5	Emission
Clause 6	Immunity
Clause 7	Fixed power supplies on railway property not used for railway traction purposes
Tables 1 to 8	Detailed emission and immunity requirements by port

The standard includes power feed to the apparatus, the apparatus itself, protective control circuits, switching stations, substations, autotransformers, booster transformers, and power switchgear. It also gives limits for apparatus inside a substation boundary, beside the track for supply control or regulation, and beside the track for ancillary railway uses.

It excludes equipment such as fire detection devices, room access devices, air conditioning, and lighting systems installed inside substations. Filters operating at railway system voltage are also treated separately because site conditions and access rules are specific to each installation.

What are the key requirements of kSIST FprEN 50121-5:2026?

kSIST FprEN 50121-5:2026 is built around practical EMC testing of the apparatus in its intended railway setting. The main idea is to test representative operating conditions, apply port-specific limits, and record the exact configuration so the result can be repeated and understood.

Test planning and scope boundaries

• Clause 4 requires testing in a typical operating mode that gives the highest emission or susceptibility for the frequency band being assessed. In practice, the manufacturer has to choose and document the mode that is most demanding for EMC.
• If the apparatus is part of a system or can connect to auxiliary equipment, Clause 4 requires testing in a representative configuration with the cabling needed to exercise the ports. This matters because EMC behavior often changes when real cables and companion units are connected.
• Clause 4 also requires a test plan that states the conditions, configuration, cabling, and mode of operation. That test plan becomes the record that ties the measurements to the installed equipment.
• For apparatus in the scope of the Radio Equipment Directive, Clause 4 points to ETSI exclusion bands and, for combined equipment, requires testing in those bands to assess non-radio functions. In practice, radio functions may show degraded performance in those bands, and that must be reported.

Emission requirements

• Clause 5.1 ties substation emissions to prEN 50121-2:2025 for radio-frequency noise to the outside world, with guidance for DC and power-frequency magnetic fields. This connects the fixed power-supply standard to the broader railway-system emission standard.
• Clause 5.2 applies conducted emission limits to low-voltage ports and radiated emission limits to all equipment. The practical result is that the enclosure, power ports, and wired network ports are each checked against their own limit set in Tables 1 to 3.
• Clause 5.2 also allows some enclosure-port compliance to be demonstrated at the substation level when individual testing is not practical and the parties agree. That gives flexibility for large or integrated installations.
• The emission tables refer to Basic Standards for methods and set-ups, so the document does not repeat the full measurement procedure. Instead, it tells you which test family to use and what the relevant limit structure is.

Immunity requirements

• Clause 6.1 requires a functional description and performance criteria in the test report, based on criteria A, B, and C from prEN 50121-1:2025. This means the report must explain what counts as acceptable behavior during and after each test.
• Clause 6.2 says immunity tests are performed port by port, as separate tests, in a well-defined and reproducible manner. The sequence is optional, but each step must be documented.
• Clause 6.2 requires testing at the rated supply voltage and within the specified operating range, in the most susceptible operating mode that still reflects normal use. That matters because a passing result only has value if it reflects how the equipment will actually be run.
• Tables 4 to 8 split immunity by enclosure ports, I/O ports, DC input and output power ports, AC input and output power ports, and earth ports. The table structure helps users see exactly which port needs which test.
• The immunity tables include radio-frequency immunity, electrostatic discharge, power-frequency magnetic field, fast transients, surge, and damped oscillatory wave tests. For users, that means each external interface must be checked against the disturbance types most likely to appear in railway environments.

Fixed power supplies outside traction use

• Clause 7 separates fixed power supplies on railway property that are not used for traction purposes into two groups. Supplies from non-railway sources are outside the scope, while supplies from railway sources shared with traction need emission and immunity levels defined and justified for the application.
• This distinction matters for station services, office services, freight cranes, and yard lighting, because the source of the supply changes the EMC approach.

What terms does kSIST FprEN 50121-5:2026 define?

• apparatus - A device or assembly of devices that can work as an independent unit for specific functions.
• port - A particular interface that connects equipment to the external electromagnetic environment.
• railway substation - An installation that transforms primary supply to the contact line voltage, and sometimes frequency.
• long distance line - An I/O line longer than 30 m inside a building or any line that leaves the building.
• 3 m zone - The area within 3 m of the track centreline or within 3 m of electrical substation parts.
• 10 m zone - The area within 10 m of the track centreline or within 10 m of electrical substation parts.
• low voltage (LV) - Nominal voltage up to AC 1 000 V or DC 1 500 V.
• electromagnetic compatibility (EMC) - The ability of equipment to operate satisfactorily in its electromagnetic environment without causing unacceptable disturbances.
• alternating current (AC) - Current that changes direction periodically.
• direct current (DC) - Current that flows in one direction.
• root mean square (RMS) - The effective value used to express AC magnitude.
• input/output (I/O) - A port type used for signal or data interfaces.

Who uses kSIST FprEN 50121-5:2026?

kSIST FprEN 50121-5:2026 is used by railway equipment manufacturers, EMC engineers, test laboratories, system integrators, and substation designers. It is also relevant to quality managers and procurement teams who need to specify, test, or accept railway power-supply equipment against a defined EMC standard.

In practice, these users apply it when they select test configurations, define representative operating modes, document performance criteria, and decide whether a substation, switchgear set, transformer, or trackside supply unit has acceptable emission and immunity behavior.

What changed in kSIST FprEN 50121-5:2026 from the previous edition?

kSIST FprEN 50121-5:2026 supersedes EN 50121-5:2017 and EN 50121-5:2017/A1:2019. The foreword lists these technical changes compared with the earlier edition:

• updated Introduction
• updated scope
• updated normative references
• updated terms and definitions and abbreviations
• new structure with Clause 4, Clause 5, and Clause 6
• new headline for Clause 5.2 and new Tables 1 to 3
• clarified immunity requirements in Clause 6.2 and updated Tables 4 to 8
• merger of the former Tables 2 and 3 into a new Table 5 for immunity of I/O ports
• deletion of Annex A
• deletion of Annex ZZ

Which standards are used with kSIST FprEN 50121-5:2026?

Referenced standard	What it contributes
prEN 50121-1:2025	General EMC provisions and the A, B, C performance criteria
prEN 50121-2:2025	Whole-railway-system emission requirements to the outside world
EN IEC 55014-1:2021	Criteria used in conducted-emission click assessment
EN 55016-1-1, EN 55016-1-2, EN 55016-1-4, EN 55016-1-6	Measuring apparatus, coupling devices, antennas, test sites, and antenna calibration
EN 55016-2-1 and EN 55016-2-3	Conducted and radiated disturbance measurement methods
EN 55032:2015	Conducted-emission framework used for wired network port measurements
EN 61000-4-2, EN IEC 61000-4-3, EN 61000-4-4, EN 61000-4-5, EN IEC 61000-4-6, EN 61000-4-8, EN IEC 61000-4-18	Immunity test methods for ESD, RF field, fast transients, surge, conducted RF, magnetic field, and damped oscillatory waves
EN IEC 61000-4-20	TEM waveguide emission and immunity testing
EN IEC 61000-6-1, EN IEC 61000-6-2, EN IEC 61000-6-3, EN IEC 61000-6-4	Generic EMC standards used for equipment or ports outside the railway-specific cases
IEC 60050-161	EMC terminology
ETSI EN 301 489-1 and ETSI EG 203 367	RED-related EMC exclusions and combined radio/non-radio equipment handling

What does the kSIST FprEN 50121-5:2026 document contain?

kSIST FprEN 50121-5:2026 contains one figure on equipment ports and eight tables that organize the emission and immunity test requirements by port and test facility. The emission tables cover low-voltage AC mains ports, wired network ports, and radiated emission from the enclosure port, while the immunity tables cover enclosure ports, I/O ports, DC power ports, AC power ports, and earth ports.

The document also gives the test logic behind those tables: how to choose the test mode, how to define the configuration, how to treat auxiliary equipment, and how to report the result. That makes it useful not only for testing, but also for design reviews, EMC planning, technical documentation, and acceptance decisions.

SLOVENSKI STANDARD
oSIST prEN 50121-5:2025
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
oSIST prEN 50121-5:2025 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 50121-5:2025
oSIST prEN 50121-5:2025
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

oSIST prEN 50121-5:2025
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
oSIST prEN 50121-5:2025
prEN 50121-5:2025 (E)
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;
oSIST prEN 50121-5:2025
prEN 50121-5:2025 (E)
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.
oSIST prEN 50121-5:2025
prEN 50121-5:2025 (E)
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.
oSIST prEN 50121-5:2025
prEN 50121-5:2025 (E)
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)
oSIST prEN 50121-5:2025
prEN 50121-5:2025 (E)
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 disturbances and immunity - Radiated disturbance
119 measurements (CISPR 16-2-3:2016)
120 EN 55032:2015 , Electromagnetic compatibility of multimedia equipment - Emission Requirements
121 (CISPR 32:2015)
122 EN 61000-4-2:2009, Electromagnetic compatibility (EMC) - Part 4-2: Testing and measurement
123 techniques - Electrostatic discharge immunity test (IEC 61000-4-2:2008)
124 EN IEC 61000-4-3:2020, Electromagnetic compatibility (EMC) - Part 4-3 : Testing and measurement
125 techniques - Radiated, radio-frequency, electromagnetic field immunity test (IEC 61000-4-3:2020)
126 EN 61000-4-4:2012, Electromagnetic compatibility (EMC) - Part 4-4: Testing and measurement
127 techniques - Electrical fast transient/burst immunity test (IEC 61000-4-4:2012)
128 EN 61000-4-5:2014, Electromagnetic compatibility (EMC) - Part 4-5: Testing and measurement
129 techniques - Surge immunity test (IEC 61000-4-5:2014)
130 EN IEC 61000-4-6:2023, Electromagnetic compatibility (EMC) - Part 4-6: Testing and measurement
131 techniques - Immunity to conducted disturbances, induced by radio-frequency fields
132 (IEC 61000-4-5:2023)
133 EN 61000-4-8:2010, Electromagnetic compatibility (EMC) - Part 4-8: Testing and measurement
134 techniques - Power frequency magnetic field immunity test (IEC 61000-4-8:2009)
135 EN IEC 61000-4-18:2019 , Electromagnetic compatibility (EMC) - Part 4-18: Testing and measurement
136 techniques - Damped oscillatory wave immunity test (IEC 61000-4-18:2019)

As impacted by EN 55016-1-2:2014/A1:2018.
As impacted by EN 55016-1-6:2015/A1:2017 and EN 55016-1-6:2015/A2:2022.
As impacted by EN 55016-2-1:2014/A1:2017 and EN 55016-2-1:2014/AC:2020-09.
As impacted by EN 55016-2-3:2017/A1:2019 and EN 55016-2-3:2017/A2:2023.
As impacted by EN 55032:2015/AC:2016-07, EN 55032:2015/A1:2020 and EN 55032:2015/A11:2020.
As impacted by EN IEC 61000 4 18:2019/AC:2019-10.
oSIST prEN 50121-5:2025
prEN 50121-5:2025 (E)
137 EN IEC 61000-4-20, Electromagnetic compatibility (EMC) - Part 4-20: Testing and measurement
138 techniques - Emission and immunity testing in transverse electromagnetic (TEM) waveguides (IEC
139 61000-4-20:2022)
140 EN IEC 61000-6-1:2019, Electromagnetic compatibility (EMC) - Part 6-1: Generic standards - Immunity
141 standard for residential, commercial and light-industrial environments (IEC 61000-6-1:2016)
142 EN IEC 61000-6-2:2019, Electromagnetic compatibility (EMC) - Part 6-2: Generic standards - Immunity
143 standard for industrial environments (IEC 61000-6-2:2016)
144 EN IEC 61000-6-3:2021, Electromagnetic compatibility (EMC) - Part 6-3: Generic standards - Emission
145 standard for equipment in residential environments (IEC 61000-6-3:2020)
146 EN IEC 61000-6-4:2019, Electromagnetic compatibility (EMC) - Part 6-4: Generic standards - Emission
147 standard for industrial environments (IEC 61000-6-4:2018)
148 IEC 60050-161:1990, International Electrotechnical Vocabulary. Chapter 161: Electromagnetic
149 compatibility
150 ETSI EN 301-489-1, V2.2.3, (11/2019), ElectroMagnetic Compatibility (EMC) standard for radio
151 equipment and services; Part 1: Common technical requirements; Harmonised Standard for
152 ElectroMagnetic Compatibility
153 ETSI EG 203 367 V1.1.1 (06/2016), Guide to the application of harmonised standards covering articles
154 3.1b and 3.2 of the Directive 2014/53/EU (RED) to multi-radio and combined radio and non-radio
155 equipment
156 3 Terms definitions and abbreviations
157 3.1 Terms and definitions
158 For the purposes of this document, the terms and definitions given in IEC 60050-161:1990 and the
159 following apply.
160 ISO and IEC maintain terminology databases for use in standardization at the following addresses:
161 — ISO Online browsing platform: available at https://www.iso.org/obp/
162 — IEC Electropedia: available at https://www.electropedia.org/
163 3.1.1
164 apparatus
165 device or assembly of devices which can be used as an independent unit for specific functions
166 3.1.2
167 port
168 particular interface of an equipment which couples this equipment with
169 the external electromagnetic environment (161-01-01) and through which the equipment is influenced
170 by this environment
171 EXAMPLE Examples of ports of interest are shown in Figure 1. The enclosure port is the physical boundary
172 of the apparatus (e.g. enclosure). The enclosure port provides for radiated and electrostatic discharge (161-01-22)
173 energy transfer, whereas the other ports provide for conducted energy transfer.
oSIST prEN 50121-5:2025
prEN 50121-5:2025 (E)
176 Figure 1 — Equipment ports
177 Note 1 to entry: Ports in the subject area of electromagnetic compatibility are specific cases of the port defined
178 in 131-12-60
179 [SOURCE: IEC 60050-161:1990, 161-01-27, modified – in the example Figure Signal/control port was
180 exchanged by I/O port and Functional earth port was exchanged by earth port]
181 3.1.3
182 railway substation
183 installation whose main function is to supply a contact line system at which the voltage of a primary
184 supply system, and in some cases the frequency, is transformed to the voltage and frequency of the
185 contact line
186 3.1.4
187 long distance line
188 line connected to a I/O port and which inside a building is longer than 30 m, or which leaves the building
189 (including a line installed outdoors)
190 3.1.5
191 3 m zone
192 area along the railway line within a distance of 3 m from the centreline of the nearest track at both sides
193 of the track or within a distance of 3 m from electrical substation parts
194 3.1.6
195 10 m zone
196 area along the railway line within a distance of 10 m from the centreline of the nearest track at both sides
197 of the track or within a distance of 10 m from electrical substation parts
198 3.1.7
199 low voltage LV
200 nominal voltage up to and including AC 1 000 V or DC 1 500 V
201 Note 1 to entry: The definition is derived from IEC 60050-601:1985, 601-01-25 and 601-01-26
202 3.2 Abbreviations
203 For the purposes of this document, the abbreviations given in EN IEC 61000-6-4 and the following apply.
AC Alternating Current
AM Amplitude modulation
DC Direct Current
EMC Electro Magnetic Compatibility
RMS Root Mean Square
I/O Input / Output
oSIST prEN 50121-5:2025
prEN 50121-5:2025 (E)
204 4 Overall aspects
205 It is not always possible to test every function of the apparatus. The tests shall be made at a typical
206 oper
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