SIST EN 50124-1:2017

SLOVENSKI STANDARD
SIST EN 50124-1:2017
01-maj-2017
1DGRPHãþD
SIST EN 50124-1:2002
SIST EN 50124-1:2002/A1:2004
SIST EN 50124-1:2002/A2:2005
äHOH]QLãNHQDSUDYH8VNODGLWHYL]RODFLMHGHO2VQRYQH]DKWHYH,]RODFLMVNHLQ
SOD]LOQHUD]GDOMH]DYVRHOHNWULþQRLQHOHNWURQVNRRSUHPR
Railway applications - Insulation coordination - Part 1: Basic requirements - Clearances
and creepage distances for all electrical and electronic equipment
Bahnanwendungen - Isolationskoordination - Teil 1: Grundlegende Anforderungen - Luft-
und Kriechstrecken für alle elektrischen und elektronischen Betriebsmittel
Applications ferroviaires - Coordination de l'isolement - Partie 1: Prescriptions
fondamentales - Distances d'isolement dans l'air et lignes de fuite pour tout matériel
électrique et électronique
Ta slovenski standard je istoveten z: EN 50124-1:2017
ICS:
29.080.01 (OHNWULþQDL]RODFLMDQD Electrical insulation in
VSORãQR general
29.280 (OHNWULþQDYOHþQDRSUHPD Electric traction equipment
SIST EN 50124-1:2017 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50124-1:2017

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SIST EN 50124-1:2017

EUROPEAN STANDARD EN 50124-1

NORME EUROPÉENNE

EUROPÄISCHE NORM
March 2017
ICS 29.080.01; 29.280 Supersedes EN 50124-1:2001
English Version
Railway applications - Insulation coordination - Part 1: Basic
requirements - Clearances and creepage distances for all
electrical and electronic equipment
Applications ferroviaires - Coordination de l'isolement - Bahnanwendungen - Isolationskoordination - Teil 1:
Partie 1: Prescriptions fondamentales - Distances Grundlegende Anforderungen - Luft- und Kriechstrecken für
d'isolement dans l'air et lignes de fuite pour tout matériel alle elektrischen und elektronischen Betriebsmittel
électrique et électronique
This European Standard was approved by CENELEC on 2017-02-06. 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 CEN-CENELEC
Management Centre 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 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.



European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 50124-1:2017 E

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SIST EN 50124-1:2017
EN 50124-1:2017 (E)
Contents Page
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Basis for insulation coordination . 11
4.1 Basic principles . 11
4.1.1 General . 11
4.1.2 Insulation coordination with regard to voltage . 11
4.1.3 Insulation coordination with regard to environmental conditions . 12
4.2 Voltages and voltage ratings . 13
4.2.1 General . 13
4.2.2 Rated insulation voltage U . 13
Nm
4.2.3 Rated impulse voltage U . 13
Ni
4.3 Time under voltage stress. 14
4.4 Pollution . 14
4.5 Insulating material . 15
4.5.1 General . 15
4.5.2 Comparative tracking index (CTI) . 15
5 Requirements and dimensioning rules for clearances . 16
5.1 General . 16
5.2 Minimum clearances . 16
5.2.1 Functional insulation. 16
5.2.2 Basic and supplementary insulation . 16
5.2.3 Reinforced insulation . 16
5.3 Contingency . 16
5.4 Clearances for altitudes higher than 2 000 m . 17
6 Dimensioning rules for creepage distances . 17
6.1 General . 17
6.2 Minimum creepage distances . 17
6.2.1 Functional, basic and supplementary insulations . 17
6.2.2 Reinforced insulation . 17
7 Tests and measurements . 18
7.1 General . 18
7.2 Measurement of creepage distances and clearances . 18
7.2.1 Method and values . 18
7.2.2 Acceptance criteria . 18
7.3 Verification of clearances by impulse test . 18
7.3.1 Method and values . 18
7.3.2 Test acceptance criteria . 19
7.4 Verification of clearances by power-frequency test . 19
7.4.1 Method and values . 19
7.4.2 Test acceptance criteria . 19
7.5 Verification of clearances by d.c. voltage test . 19
7.5.1 Method and values . 19
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7.5.2 Test acceptance criteria . 19
8 Specific requirements for applications in the railway field . 20
8.1 General . 20
8.2 Specific requirements for signalling . 20
8.2.1 Overvoltage categories . 20
8.2.2 Rated impulse voltages . 21
8.2.3 Induced voltages . 21
8.2.4 Installation instructions . 21
8.2.5 Pollution degrees . 21
8.3 Specific requirements for rolling stock . 21
8.3.1 Determination of the rated impulse voltage U by method 1 . 21
Ni
8.3.2 Creepage distances . 22
8.3.3 Roof installations . 22
8.4 Specific requirements for fixed installations . 22
8.4.1 Determination of the rated impulse voltage U by method 1 . 22
Ni
8.4.2 Distances of outdoor insulators . 23
Annex A (normative) Tables . 24
Annex B (normative) Provisions for type and routine dielectric tests for
equipment . 31
B.1 General . 31
B.2 Tests . 31
Annex C (normative) Methods of measuring creepage distances and clearances . 33
Annex D (normative) Correlation between U and U . 40
n Nm
Annex E (informative) Macro-environmental conditions . 41
Annex F (informative) Application guide . 42
F.1 Introduction . 42
F.2 Determination of minimum clearances and creepage distances . 42
F.3 Examples . 48
F.4 Tests . 50
Annex ZZ (informative) Relationship between this European Standard and the
Essential Requirements of EU Directive 2008/57/EC . 52
Bibliography . 53
Tables
Table A.1 — Rated impulse voltage U for low voltage circuits not powered
Ni
directly by the contact line . 24
Table A.2 — Rated impulse voltages (U ) for circuits powered by the contact line
Ni
and for traction power circuits in thermo-electric driven vehicles . 25
Table A.3 — Minimum clearances in air for the standard altitude ranges based on
the rated impulse voltage U . 26
Ni
Table A.4 — Definition of pollution degrees . 27
Table A.5 — Minimum creepage distances based on rated insulation voltage U
Nm
up to 1 000 V for printed wiring material and associated components . 27
Table A.6 — Minimum creepage distances for low values of rated insulation
voltage U for materials other than printed wiring material . 28
Nm
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Table A.7 — Minimum creepage distances (in mm/kV) for high values of rated
insulation voltage U . 28
Nm
Table A.8 — Test voltages for verifying clearances at atmospheric and altitude
reference conditions, not to be used for routine dielectric tests . 29
Table A.9 — Altitude correction factors for clearances in circuits with U up to
Ni
and including 60 kV when equipment is intended to be used above 2 000 m . 30
Table A.10 — Altitude correction factors for clearances in circuits with U higher
Ni
than 60 kV when equipment is intended to be used above 2 000 m . 30
Table B.1 — Dielectric test for equipment - Short-duration power-frequency (a.c.)
test levels U (kV) based on the rated impulse voltage U (kV) . 32
a Ni
Table C.1 — Minimum dimensions of grooves . 33
Table D.1 — Correlation between nominal voltages of the railway power
distribution system and the required insulation voltages for circuits of
equipment which are intended to be connected to these systems . 40
Table E.1 — Correlation between pollution degrees and macro-environmental
conditions . 41
Table F.1 — Example for the determination of clearances and creepage distances . 50
Table ZZ.1 — Correspondence between this European Standard, the TSI
“Locomotives and Passenger Rolling Stock” (REGULATION (EU) No 1302/2014 of
18 November 2014 . 52
) and Directive 2008/57/EC
Table ZZ.2 — Correspondence between this European Standard, the TSI “Energy”
(REGULATION (EU) No 1301/2014 of 18 November 2014) and Directive 2008/57/EC . 52
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EN 50124-1:2017 (E)
European foreword
This document (EN 50124-1:2017) has been prepared by CLC/TC 9X, “Electrical and electronic
applications for railways.”
The following dates are fixed:
• latest date by which this document has to be (dop) 2018–02–06
implemented at national level by publication
of an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2020–02–06
conflicting with this document have to

be withdrawn
This document supersedes EN 50124-1:2001, EN 50124-1:2001/A1:2003 and
EN 50124-1:2001/A1:2005.
EN 50124-1:2017 includes the following significant technical changes with respect to EN 50124-
1:2001:
• the scope has been enlarged to include altitudes higher than 2 000 m above sea level;
• related requirements have been included, especially new subclause 5.4, Table A.9 and
Table A.10.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
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.
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Introduction
Special conditions occurring in railway applications and the fact that the equipment here concerned
falls into the scope of both the EN 60071 series (prepared by CLC/SR 28) and EN 60664-1 (prepared
by CLC/SR 109), led to the decision to draw from these documents and from EN 60077-1 (prepared
by CLC/TC 9), a single document of reference for all standards applicable to the whole railway field.
EN 50124 consists of two parts:
— EN 50124-1, Railway applications - Insulation coordination - Part 1: Basic requirements -
Clearances and creepage distances for all electrical and electronic equipment;
— EN 50124-2, Railway applications - Insulation coordination - Part 2: Overvoltages and related
protection.
This Part 1 allows, in conjunction with EN 50124-2, to take into account advantages resulting from the
presence of overvoltage protection when dimensioning clearances.
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1 Scope
This European Standard deals with insulation coordination in railways. It applies to equipment for use
in signalling, rolling stock and fixed installations.
Insulation coordination is concerned with the selection, dimensioning and correlation of insulation both
within and between items of equipment. In dimensioning insulation, electrical stresses and
environmental conditions are taken into account. For the same conditions and stresses, these
dimensions are the same.
An objective of insulation coordination is to avoid unnecessary over dimensioning of insulation.
This standard specifies:
— requirements for clearances and creepage distances for equipment;
— general requirements for tests pertaining to insulation coordination.
The term equipment relates to a section as defined in 3.3 it may apply to a system, a sub-system, an
apparatus, a part of an apparatus, or a physical realization of an equipotential line.
This standard does not deal with:
— distances through solid or liquid insulation;
— distances through gases other than air;
— distances through air not at atmospheric pressure;
— equipment used under extreme conditions.
Product standards should align with this generic standard.
However, they may require, with justification, different requirements due to safety and/or reliability
reasons, e.g. for signalling, and/or particular operating conditions of the equipment itself, e.g.
overhead contact lines which should comply with EN 50119.
This standard also gives provisions for dielectric tests (type tests or routine tests) on equipment (see
Annex B).
NOTE For safety critical systems, specific requirements are needed. These requirements are given in the
product specific signalling standard EN 50129.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 50123 (all parts), Railway applications - Fixed installations - D.C. switchgear
EN 50163, Railway applications - Supply voltages of traction systems
EN 60060-1, High-voltage test techniques - Part 1: General definitions and test requirements (IEC
60060-1)
EN 60071-1, Insulation co-ordination - Part 1: Definitions, principles and rules (IEC 60071-1)
EN 60112, Method for the determination of the proof and the comparative tracking indices of solid
insulating materials (IEC 60112)
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EN 60587, Electrical insulating materials used under severe ambient conditions - Test methods for
evaluating resistance to tracking and erosion (IEC 60587)
EN 60664-1:2007, Insulation coordination for equipment within low-voltage systems - Part 1:
Principles, requirements and tests (IEC 60664-1:2007)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE The definitions apply according to the following order of priority:
— the definition given here-under;
— the definition given in EN 60664–1;
— the definition given in the documents mentioned in Clause 2 other than EN 60664–1.
3.1
clearance
shortest distance in air between two conductive parts
3.2
creepage distance
shortest distance along the surface of the insulating material between two conductive parts
3.3 Sections
3.3.1
section
part of an electrical circuit having its own voltage ratings for insulation coordination
Note 1 to entry: Sections fall into two categories: earthed section and floating section.
3.3.2
earthed section
section connected to earth or to the vehicle body through a circuit for which interruption is not
expected
3.3.3
floating section
section isolated from earth or from the vehicle body
Note 1 to entry: A section can be under electrical influence from adjacent sections.
Note 2 to entry: A particular point of a circuit can be considered as a section.
3.4 Voltages
3.4.1
nominal voltage
U
n
suitable approximate voltage value used to designate or identify a given supply system
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3.4.2
working voltage
highest r.m.s. value of the a.c or d.c voltage which can occur between two points across any
insulation, each circuit likely to influence the said r.m.s. value being supplied at its maximum
permanent voltage
Note 1 to entry: Permanent means that the voltage lasts more than 5 min, as Umax 1 in EN 50163.
3.4.3
rated voltage
value of voltage assigned by the manufacturer to a component, device or equipment and to which
operation and performance characteristics are referred
Note 1 to entry: Equipment may have more than one rated voltage value or may have a rated voltage range.
3.4.4
rated insulation voltage
U
Nm
r.m.s. withstand voltage value assigned by the manufacturer to the equipment or a part of it,
characterising the specified permanent (over 5 min) withstand capability of its insulation
Note 1 to entry: UNm is a voltage between a live part of equipment and earth or another live part. For rolling
stock, earth refers to the vehicle body.
Note 2 to entry: For circuits, systems and sub-systems in railway applications this definition is preferred to
“highest voltage for equipment” which is widely used in international standards
Note 3 to entry: U is higher than or equal to the working voltage. As a consequence, for circuits directly
Nm
connected to the contact line, UNm is equal to or higher than Umax1 as specified in EN 50163.
Note 4 to entry: UNm is not necessarily equal to the rated voltage which is primarily related to functional
performance.
3.4.5
working peak voltage
highest value of voltage which can occur in service across any particular insulation
3.4.6
recurring peak voltage
maximum peak value of periodic excursions of the voltage waveform resulting from distortions of an
a.c. voltage or from a.c. components superimposed on a d.c. voltage
Note 1 to entry: Random overvoltages, for example due to occasional switching, are not considered to be
recurring peak voltages.
3.4.7
rated impulse voltage
U
Ni
impulse voltage value assigned by the manufacturer to the equipment or a part of it, characterising the
specified withstand capability of its insulation against transient overvoltages
Note 1 to entry: UNi is higher than or equal to the working peak voltage.
3.5
overvoltage
voltage having a peak value exceeding the corresponding peak value (including recurrent
overvoltages) of maximum steady-state voltage at normal operating conditions
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3.5.1
temporary overvoltage
overvoltage of relatively long duration due to voltage variations
Note 1 to entry: A temporary overvoltage is independent of the network load. It is characterized by a
voltage/time curve.
3.5.2
transient overvoltage
short duration overvoltage of a few milliseconds or less due to current transfers
Note 1 to entry: A transient overvoltage depends on the network load. It cannot be characterized by a
voltage/time curve. Basically, a transient overvoltage is the result of a current transfer from a source to the load
(network).
Note 2 to entry: Two particular transient overvoltages are defined in 3.5.3 and 3.5.4.
3.5.3
switching overvoltage
transient overvoltage at any point of the system due to specific switching operation or fault
3.5.4
lightning overvoltage
transient overvoltage at any point of the system due to a specific lightning discharge
Note 1 to entry: The definitions of 3.5 are in accordance with those of EN 60664–1 and EN 50163. However, the
prevalence of the nature of the cause (voltage variations or current transfer) upon time, for segregating transient
overvoltages from temporary ones, is clearly stated here (whereas the nature of the cause is not considered in
EN 60664–1). Long-term (typically 20 ms to typically 1 s) overvoltages defined in EN 50163, dedicated to contact
line networks, are equivalent to temporary overvoltages.
3.6 Insulations
3.6.1
functional insulation
insulation between conductive parts which is necessary only for the proper functioning
3.6.2
basic insulation
insulation applied to live parts to provide basic protection against electric shock
3.6.3
supplementary insulation
independent insulation applied in addition to basic insulation, in order to provide protection against
electric shock in the event of failure of basic insulation
3.6.4
double insulation
insulation comprising both basic insulation and supplementary insulation
3.6.5
reinforced insulation
single insulation system applied to live parts, which provides a degree of protection against electric
shock equivalent to double insulation
Note 1 to entry: The term “single insulation system” does not imply that the insulation involves one
homogeneous piece. It may involve several layers which cannot be tested singly as basic and supplementary
insulation.
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3.7 Contact lines
3.7.1
contact line
conductor system for supplying electric energy to vehicles through current-collecting equipment
[SOURCE: IEC 60050-811:1991, 811-33-01]
3.7.2
overhead contact line
catenary (deprecated)
contact line placed above (or beside) the upper limit of the vehicle gauge and supplying vehicles with
electric energy through roof-mounted current collection equipment
[SOURCE: IEC 60050-811:1991, 811-33-02]
4 Basis for insulation coordination
4.1 Basic principles
4.1.1 General
Insulation coordination implies the selection of the electric insulation characteristic of the equipment
with regard to its application and in relation to its surroundings.
Insulation coordination can only be achieved if the design of the equipment is based on the stresses to
which it is likely to be subjected during its anticipated lifetime.
4.1.2 Insulation coordination with regard to voltage
4.1.2.1 General
Consideration shall be given to:
— the voltages which can appear in the system;
— the voltages generated by the equipment (which could adversely affect other equipment in the
system);
— the degree of the expected availability of the equipment;
— the safety of persons and property, so that the probability of undesired incidents due to voltage
stresses do not lead to an unacceptable risk of harm;
— the safety of functions for control and protection systems;
— voltages induced in track-side cables;
— the shape of insulating surfaces;
— the orientation and the location of creepage distances;
— if necessary: the altitude that applies.
4.1.2.2 Insulation coordination with regard to permanent a.c. or d.c. voltages
Insulation coordination with regard to permanent voltages is based on:
— rated voltage;
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