Railway applications - Rolling stock - Electronic equipment

This document applies to all electronic equipment for control, regulation, protection, diagnostic, energy
supply, etc. installed on rail vehicles.
For the purpose of this document, electronic equipment is defined as equipment composed of electronic
components (e.g. resistors, capacitors, transistors, diodes, integrated circuits, hybrids, application
specific integrated circuits, wound components and relays), and recognized associated components
(e.g. connectors, mechanical parts). These components are mainly mounted on printed circuit boards.
Sensors (e.g. current, voltage, speed) and semiconductor drive units for power electronic devices are
covered by this standard. Complete semiconductor drive units and power converters are covered by
EN 61287-1.
This document covers the requirements for operating conditions, design, documentation, testing and
integration of electronic equipment, as well as hardware and software requirements considered
necessary for compliant and reliable equipment.
Specific requirements related to practices necessary to ensure defined safety integrity level or functional
safety are not covered by this document. Nevertheless, this document applies to the hardware of all
rolling stock electronic equipment or systems performing safety-related functions.
The software requirements for on-board railway equipment are specified by EN 50657.

Bahnanwendungen - Elektronische Einrichtungen auf Schienenfahrzeugen

Applications ferroviaires - Équipements électroniques utilisés sur le matériel roulant

Železniške naprave - Vozna sredstva - Elektronska oprema

General Information

Status
Published
Public Enquiry End Date
29-Apr-2019
Publication Date
05-Sep-2021
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
27-Jul-2021
Due Date
01-Oct-2021
Completion Date
06-Sep-2021

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SLOVENSKI STANDARD
SIST EN 50155:2021
01-oktober-2021
Nadomešča:
SIST EN 50155:2018
Železniške naprave - Vozna sredstva - Elektronska oprema
Railway applications - Rolling stock - Electronic equipment
Bahnanwendungen - Elektronische Einrichtungen auf Schienenfahrzeugen

Applications ferroviaires - Équipements électroniques utilisés sur le matériel roulant

Ta slovenski standard je istoveten z: EN 50155:2021
ICS:
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
SIST EN 50155:2021 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 50155:2021
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SIST EN 50155:2021
EUROPEAN STANDARD EN 50155
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2021
ICS 45.060.01 Supersedes EN 50155:2017 and all of its amendments
and corrigenda (if any)
English Version
Railway applications - Rolling stock - Electronic equipment

Applications ferroviaires - Équipements électroniques Bahnanwendungen - Fahrzeuge - Elektronische

utilisés sur le matériel roulant Betriebsmittel

This European Standard was approved by CENELEC on 2021-06-28. 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, 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.
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.

Ref. No. EN 50155:2021 E
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SIST EN 50155:2021
EN 50155:2021 (E)
Contents

European foreword ................................................................................................................................. 5

Introduction ............................................................................................................................................. 8

1 Scope ........................................................................................................................................ 9

2 Normative references .............................................................................................................. 9

3 Terms, definitions and abbreviations ..................................................................................11

3.1 Terms and definitions ...............................................................................................................11

3.2 Abbreviations ...........................................................................................................................17

4 General requirements ............................................................................................................18

4.1 Requirement for equipment characteristics .............................................................................18

4.2 Classes of environmental, constructional and service conditions ...........................................18

4.3 Performance criteria .................................................................................................................18

4.4 Environmental service conditions ............................................................................................19

4.5 Special service conditions ........................................................................................................23

4.6 Installation requirements ..........................................................................................................23

5 Electrical service conditions ................................................................................................24

5.1 General ....................................................................................................................................24

5.2 Battery voltage supply system .................................................................................................26

5.3 Supply by another source than the vehicle battery ..................................................................30

6 Reliability, maintainability and expected useful life ...........................................................30

6.1 Equipment reliability .................................................................................................................30

6.2 Useful life .................................................................................................................................31

6.3 Maintainability ..........................................................................................................................31

6.4 Automatic test equipment ........................................................................................................32

6.5 Purpose-built test equipment and special tools .......................................................................32

7 Design .....................................................................................................................................33

7.1 General ....................................................................................................................................33

7.2 Detailed practices - Hardware ..................................................................................................33

7.3 Detailed practices - Software ...................................................................................................37

7.4 Features of software-controlled equipment .............................................................................37

8 Electronic equipment not designed for use on rolling stock ............................................38

9 Components ...........................................................................................................................38

9.1 Procurement .............................................................................................................................38

9.2 Application ................................................................................................................................38

10 Construction ...........................................................................................................................39

10.1 Equipment construction ...........................................................................................................39

10.2 Component mounting ...............................................................................................................40

10.3 Electrical connections ..............................................................................................................41

10.4 Internal flexible wiring (electrical and optical) ..........................................................................42

10.5 Flexible printed wiring ..............................................................................................................42

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SIST EN 50155:2021
EN 50155:2021 (E)

10.6 Printed circuit boards - flexible and rigid ..................................................................................42

10.7 Protective coatings for printed board assemblies ....................................................................43

10.8 Identification .............................................................................................................................44

10.9 Mounting ..................................................................................................................................44

10.10 Cooling and ventilation .............................................................................................................44

10.11 Materials and finishes ..............................................................................................................45

10.12 Reworking, modification and repair of electronic assemblies ..................................................45

11 Safety ......................................................................................................................................45

11.1 General ....................................................................................................................................45

11.2 Personnel safety ......................................................................................................................45

11.3 Functional safety ......................................................................................................................45

11.4 Fire behaviour requirements ....................................................................................................45

12 Documentation .......................................................................................................................46

12.1 General ....................................................................................................................................46

12.2 Supply and storage of documentation .....................................................................................46

12.3 Datasheet .................................................................................................................................46

12.4 User and maintenance manual ................................................................................................46

12.5 Equipment installation documentation .....................................................................................46

12.6 Commissioning documentation ................................................................................................47

12.7 Design documentation .............................................................................................................47

13 Testing ....................................................................................................................................51

13.1 General ....................................................................................................................................51

13.2 Categories of tests ...................................................................................................................52

13.3 List of tests and test conditions ................................................................................................53

13.4 Test specification .....................................................................................................................54

Annex A (informative) List of default requirements of EN 50155 and related subclauses ..........69

Annex B (informative) System testing approach .............................................................................70

B.1 General ....................................................................................................................................70

B.2 Situation of applicability .......................................................................................................70

B.3 General methodology ............................................................................................................70

B.3.1 General ....................................................................................................................................70

B.3.2 Item specific procedures .......................................................................................................71

B.3.3 Equipment specific steps ......................................................................................................71

B.4 Equipment integration design review ..................................................................................72

B.5 Equipment integration type test ...........................................................................................72

B.6 Equipment installation design review..................................................................................72

B.7 Equipment installation type test ...........................................................................................72

B.8 Equipment installation routine test ......................................................................................72

B.9 Equipment periodic re-verification .......................................................................................72

B.10 Replacement of items and ancillary components ..............................................................72

Annex C (informative) Severity level of service conditions in different vehicle locations ..........74

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SIST EN 50155:2021
EN 50155:2021 (E)

C.1 General ....................................................................................................................................74

C.2 Severity of service conditions in different rolling stock types .........................................74

C.3 Intended use of rolling stock ................................................................................................74

C.4 Location of equipment on-board rolling stock ...................................................................74

C.5 Severity of the service conditions in different rolling stock locations ............................76

Annex D (informative) Example for a summary of equipment type test compliance ...................78

Annex E (informative) User programmable integrated circuit life cycle example ........................81

Annex F (informative) Design suggestions for electronic hardware used on rolling stock ........82

F.1 Purpose of this annex ...........................................................................................................82

F.2 Design topics ..........................................................................................................................82

F.2.1 Pollutants ................................................................................................................................82

F.2.2 Methods against ageing regarding energetic transient pulses ........................................82

F.2.3 Capacitors to earth ................................................................................................................83

F.2.4 Inside cabling for equipment ................................................................................................83

F.2.5 Earth configuration ................................................................................................................84

F.2.6 Prototype testing ....................................................................................................................84

F.2.7 Interfacing ...............................................................................................................................84

F.2.8 Solder joint on PBA ...............................................................................................................84

F.2.9 Derating ...................................................................................................................................84

Annex G (informative) Electronic equipment not designed for use on rolling stock ..................92

Annex H (informative) Paragraphs with Agreements between the involved Parties ...................94

Annex I (informative) Electronic equipment supplied from AC supply system ............................99

I.1 General ....................................................................................................................................99

I.2 Electric requirements ............................................................................................................99

Annex J (informative) Typical content of datasheets ....................................................................100

Annex K (informative) Insulation test and testing matrix example ..............................................103

Annex L (informative) Relationship between this European Standard and the Essential

Requirements of EU Directive 2016/797/EU aimed to be covered .................................................105

Bibliography ........................................................................................................................................107

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SIST EN 50155:2021
EN 50155:2021 (E)
European foreword

This document (EN 50155:2021) has been prepared by CLC/SC 9XB, “Electrical, electronic and

electromechanical material on-board rolling stock, including associated software”.

The following dates are fixed:
• latest date by which this document has to be (dop) 2022-06-28
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2024-06-28
conflicting with this document have to be
withdrawn

This document supersedes EN 50155:2017 and all of its amendments and corrigenda (if any).

EN 50155:2021 includes the following significant technical changes with respect to EN 50155:2017:

a) Revision of Clause 1 Scope;
1) Precision about definition of electronic equipment and his components;
2) Precision about covered scopes;

3) Precision about applicability of this standard to electronic equipment or systems performing

safety-related functions.
b) Updating of Clause 2 Normative references;

c) Revision of Clause 3 Terms, definitions and abbreviations”, new definitions and reorganisation of

subclauses;
1) Definition added for “performance”;
2) Definition added for “adjacent circuit”;
3) Definition added for “specification”;
4) Definition added for “procedure”.

d) Improvement of Clause 4 General requirements, in terms of better wording, requirement expansion

and reorganisation of subclauses;

1) Precision about concept of normal performance level and concept of deviation of the normal

performance level;
2) Wording improvements of 4.3.2 to 4.3.4 “Performance criterion A, B and C”;
3) Wording improvement of “4.6.4 Thermal compatibility”;

4) Wording improvement of “4.6.6 Cabling inside vehicle” and “4.6.7 Wiring inside equipment”.

e) Improvement of Clause 5 Electrical service conditions, with reorganisation of subclauses;

1) Subclause “DC supply” is renamed “5.1.1 DC Supply system”;
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SIST EN 50155:2021
EN 50155:2021 (E)
2) Subclause “5.1.2 AC supply system” is added;
3) Precisions added and editorial improvements of 5.2.1 to 5.2.8;
4) Concept of “rated voltage” is clarified in 5.2.2;
5) Wording improvement of subclause “5.2.6 Grouping of supply voltages”;
6) Subclause added: “5.3 Supply by another source than the vehicle battery”.

f) Improvement and simplification of Clause 6 Reliability, maintainability and expected useful life, with

reorganization of subclauses and introduction of explicative figures;
g) Wording improvements and precision added to Clause 7 Design;

h) Clause 8 is renamed “Electronic equipment not designed for use on rolling stock application”;

i) Improvement of Clause 9 Components, revised requirement regarding the compliance with a quality

system;
j) Wording improvements and precisions added for Clause 10 Construction;
k) Revision of Clause 11 Safety, reorganisation of subclauses;
l) Revision of Clause 12 Documentation;

1) In addition to the datasheet and user manual, equipment installation and commissioning

information have to be provided to the user;
2) Typical content of the datasheet, is moved to Annex J;
3) The acronyms UPIC is used to designate User Programmable Integrated Circuit.
m) Improvements of texts and figures of Clause 13 Testing;

1) Generation, access and delivery of type test and routine test reports, are clarified.

2) Access or delivery of test reports, and tests subject to agreement must be agreed at tender

stage.

3) Equipment used for type tests shall be already submitted to routine test procedure and shall

be identified in the type test report by its part number and serial number.
4) Added : For “Prototype testing”, see Annex F – F.2.6
5) Table 11 — List of tests is rearranged;
6) Conditions during testing is moved in a new 13.3.2;
7) Improvements and clarification of 13.4.3 DC Power supply test;
8) Precisions added to 13.4.4 Low temperature test;
9) Precisions added to 13.4.5 Dry heat test - including use of rated voltage;
10) Precisions added to 13.4.7 Insulation test;
11) Precisions added to 13.4.8 Cyclic damp heat test;
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SIST EN 50155:2021
EN 50155:2021 (E)
12) Precisions added to 13.4.10 Shock and vibration test;
13) Precisions added to 13.4.12 Rapid temperature variation test;
14) Precisions added to 13.4.13 Salt mist test.
n) Improvement of the following informative Annexes:
1) Annex A - List of default requirements of EN 50155 and related subclauses;
2) Annex B - System Testing approach;

3) Annex C - Severity level of service conditions in different vehicle locations;

4) Annex D - Example for a summary of equipment type test compliance;
5) Annex E - User programmable integrated circuit life cycle example;
6) Annex F - Design suggestions for electronic hardware used on rolling stock;
7) Annex G - Electronic equipment not designed for use on rolling stock;
8) Annex H – Paragraphs with agreement with the involved parties.
o) Introduction of the following informative Annexes;
1) New Annex I – Electronic equipment supplied from AC supply system;
2) New Annex J – Typical content of datasheets;
3) New Annex K – Insulation test and testing matrix example.
p) Bibliography (extended and corrected).

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 Standardization Request given to CENELEC by the

European Commission and the European Free Trade Association, and supports essential requirements

of EU Directive(s) / Regulation(s).

For relationship with EU Directive(s) / Regulation(s), see informative Annex ZZ, which is an integral part

of this document.

Any feedback and questions on this document should be directed to the users’ national committee. A

complete listing of these bodies can be found on the CENELEC website.
---------------------- Page: 9 ----------------------
SIST EN 50155:2021
EN 50155:2021 (E)
Introduction

This document specifies the requirements for the design, the manufacturing, the documentation and

testing of any electronic equipment installed on-board of rolling stock.
It also describes the electrical and environmental operating conditions.

The aim of this document is not to be a detailed guideline for the design of the electronic equipment.

The design is the supplier´s responsibility, however some recommendations are given in informative

annexes in order to draw the attention of the designer on known design aspects. The supplier should

take into account the requirements resulting from the specific location of the on-board installation

(see Annex C).

This document specifies the requirements for the design, the manufacturing, the documentation and

testing of any electronic equipment installed on-board rolling stock.
The roles of user and/or supplier are shown in Figure 1 below.
Figure 1 — Roles and relationship of user and/or supplier
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SIST EN 50155:2021
EN 50155:2021 (E)
1 Scope

This document applies to all electronic equipment for control, regulation, protection, diagnostic, energy

supply, etc. installed on rail vehicles.

For the purpose of this document, electronic equipment is defined as equipment composed of electronic

components (e.g. resistors, capacitors, transistors, diodes, integrated circuits, hybrids, application

specific integrated circuits, wound components and relays), and recognized associated components

(e.g. connectors, mechanical parts). These components are mainly mounted on printed circuit boards.

Sensors (e.g. current, voltage, speed) and semiconductor drive units for power electronic devices are

covered by this standard. Complete semiconductor drive units and power converters are covered by

EN 61287-1.

This document covers the requirements for operating conditions, design, documentation, testing and

integration of electronic equipment, as well as hardware and software requirements considered

necessary for compliant and reliable equipment.

Specific requirements related to practices necessary to ensure defined safety integrity level or functional

safety are not covered by this document. Nevertheless, this document applies to the hardware of all

rolling stock electronic equipment or systems performing safety-related functions.

The software requirements for on-board railway equipment are specified by EN 50657.

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.

NOTE 1 The IPC normative references are acceptable only until an equivalent standard from an official

International or European Standardisation body will become available which cover the same requirements now

covered by the referenced IPC standard.

NOTE 2 The version of IPC normative references, herein after listed, is identified by the last letter of the

identification code, e.g. the letter J in IPC-A-600J identify the version J which was published in May 2016. However,

the publication date is reported, even though implicit in the last letter. Consequently, the date is not repeated in the

text of this document when the IPC normative references appear.

EN 45545-1:2013, Railway applications - Fire protection on railway vehicles - Part 1: General

EN 45545-2:2020, Railway applications - Fire protection on railway vehicles - Part 2: Requirements for

fire behavior of materials and components

EN 45545-5:2013+A1:2015, Railway applications - Fire protection on railway vehicles - Part 5: Fire

safety requirements for electrical equipment including that of trolley buses, track guided buses and

magnetic levitation vehicles

EN 50121-3-2, Railway applications - Electromagnetic compatibility - Part 3-2: Rolling stock -

Apparatus1), Railway applications — Electromagnetic compatibility — Part 3-2: Rolling stock -

Apparatus

EN 50124-1:2017, Railway applications - Insulation coordination - Part 1: Basic requirements -

Clearances and creepage distances for all electrical and electronic equipment

EN 50125-1:2014, Railway applications - Environmental conditions for equipment - Part 1: Rolling stock

and on-board equipment
1) Document impacted by EN 50121-3-2:2016/A1:2019.
---------------------- Page: 11 ----------------------
SIST EN 50155:2021
EN 50155:2021 (E)

EN 50126-1:2017, Railway Applications - The Specification and Demonstration of Reliability,

Availability, Maintainability and Safety (RAMS) - Part 1: Generic RAMS Process

EN 50153, Railway applications - Rolling stock - Protective provisions relating to electrical hazards2)

EN 50163, Railway applications - Supply voltages of traction systems3)

EN 50343, Railway applications - Rolling stock - Rules for installation of cabling4)

EN 50533, Railway applications - Three-phase train line voltage characteristics5)

EN 50657:2017, Railways Applications - Rolling stock applications - Software on Board Rolling Stock

EN 60068-2-1:2007, Environmental testing - Part 2-1: Tests - Test A: Cold
EN 60068-2-2:2007, Environmental testing - Part 2-2: Tests - Test B: Dry heat

EN IEC 60068-2-11:2021, Environmental testing - Part 2: Tests - Test Ka: Salt mist

EN 60068-2-30:2005, Environmental testing - Part 2-30: Tests - Test Db: Damp heat, cyclic (12 h + 12

h cycle)

EN 60297-3-100:2009, Mechanical structures for electronic equipment - Dimensions of mechanical

structures of the 482,6 mm (19 in) series - Part 3-100: Basic dimensions of front panels, subracks,

chassis, racks and cabinets

EN 60297-3-101:2004, Mechanical structures for electronic equipment - Dimensions of mechanical

structures of the 482,6 mm (19 in) series - Part 3-101: Subracks and associated plug-in units

EN 60529, Degrees of protection provided by e
...

SLOVENSKI STANDARD
oSIST prEN 50155:2019
01-april-2019
Železniške naprave - Vozna sredstva - Elektronska oprema
Railway applications - Rolling stock - Electronic equipment
Bahnanwendungen - Elektronische Einrichtungen auf Schienenfahrzeugen

Applications ferroviaires - Équipements électroniques utilisés sur le matériel roulant

Ta slovenski standard je istoveten z: prEN 50155
ICS:
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
oSIST prEN 50155:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 50155:2019
---------------------- Page: 2 ----------------------
oSIST prEN 50155:2019
EUROPEAN STANDARD DRAFT
prEN 50155
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2019
ICS 45.060.01 Will supersede EN 50155:2017
English Version
Railway applications - Rolling stock - Electronic equipment

Applications ferroviaires - Équipements électroniques Bahnanwendungen - Elektronische Einrichtungen auf

utilisés sur le matériel roulant Schienenfahrzeugen
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2019-05-17.
It has been drawn up by CLC/SC 9XB.

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, 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.

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

© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Project: 66327 Ref. No. prEN 50155 E
---------------------- Page: 3 ----------------------
oSIST prEN 50155:2019
prEN 50155:2019 (E)
Page
Contents

3 European foreword ............................................................................................................................... 8

4 Introduction ......................................................................................................................................... 10

5 1 Scope .................................................................................................................................... 11

6 2 Normative references .......................................................................................................... 11

7 3 Terms, definitions and abbreviations ................................................................................ 13

8 3.1 Terms and definitions ............................................................................................................. 13

9 3.2 Abbreviations ......................................................................................................................... 19

10 4 General requirements .......................................................................................................... 20

11 4.1 Performance requirements .................................................................................................... 20

12 4.2 Performance criteria ............................................................................................................... 20

13 4.2.1 General ........................................................................................................................... 20

14 4.2.2 Performance criterion A .................................................................................................. 20

15 4.2.3 Performance criterion B .................................................................................................. 20

16 4.2.4 Performance criterion C .................................................................................................. 21

17 4.3 Environmental service conditions .......................................................................................... 21

18 4.3.1 Altitude ............................................................................................................................ 21

19 4.3.2 Operating temperature .................................................................................................... 21

20 4.3.3 Switch-on extended operating temperature .................................................................... 22

21 4.3.4 Rapid temperature variations .......................................................................................... 23

22 4.3.5 Shock and vibration ........................................................................................................ 23

23 4.3.6 Electromagnetic compatibility ......................................................................................... 23

24 4.3.7 Relative humidity ............................................................................................................ 24

25 4.4 Special service conditions ...................................................................................................... 24

26 4.4.1 General ........................................................................................................................... 24

27 4.4.2 Atmospheric pollutants ................................................................................................... 24

28 5 Electrical service conditions .............................................................................................. 24

29 5.1 Power supply system ............................................................................................................. 24

30 5.1.1 General ........................................................................................................................... 24

31 5.1.2 Battery voltage supply system ........................................................................................ 26

32 5.1.3 Supply different from the vehicle battery ........................................................................ 30

33 5.2 Installation requirements ........................................................................................................ 30

34 5.2.1 General ........................................................................................................................... 30

35 5.2.2 Installation instructions ................................................................................................... 30

36 5.2.3 Battery voltage supply system ........................................................................................ 30

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oSIST prEN 50155:2019
prEN 50155:2019 (E)

37 5.2.4 Thermal compatibility ...................................................................................................... 30

38 5.2.5 Electromagnetic compatibility ......................................................................................... 31

39 5.2.6 Cabling inside vehicle ..................................................................................................... 31

40 5.2.7 Wiring inside cubicle / box .............................................................................................. 31

41 5.2.8 Insulation of the installation ............................................................................................ 31

42 6 Reliability, maintainability and expected useful life ......................................................... 31

43 6.1 Equipment reliability ............................................................................................................... 31

44 6.1.1 Predicted reliability .......................................................................................................... 31

45 6.1.2 Proof of reliability ............................................................................................................ 31

46 6.2 Useful life ............................................................................................................................... 32

47 6.2.1 Maintainability ................................................................................................................. 32

48 6.2.2 General ........................................................................................................................... 32

49 6.2.3 Preventive Maintenance ................................................................................................. 32

50 6.2.4 Corrective Maintenance .................................................................................................. 32

51 6.2.5 Built-in diagnostics .......................................................................................................... 33

52 6.3 Automatic test equipment ...................................................................................................... 33

53 6.4 Purpose-built test equipment and special tools ..................................................................... 33

54 7 Design ................................................................................................................................... 34

55 7.1 General .................................................................................................................................. 34

56 7.1.1 Quality management ....................................................................................................... 34

57 7.1.2 System Life-cycle ............................................................................................................ 34

58 7.2 Detailed practices - Hardware ................................................................................................ 34

59 7.2.1 Insulation coordination .................................................................................................... 34

60 7.2.2 Interfacing ....................................................................................................................... 34

61 7.2.3 Fault protection ............................................................................................................... 36

62 7.2.4 Referencing power supplies ........................................................................................... 36

63 7.2.5 Interchangeability ............................................................................................................ 36

64 7.2.6 Reduction of supply voltage and ON/OFF phases ......................................................... 36

65 7.2.7 Reverse polarity protection ............................................................................................. 36

66 7.2.8 Inrush currents ................................................................................................................ 36

67 7.2.9 Energetic transient pulses .............................................................................................. 36

68 7.2.10 Capacitance to ground/earth .......................................................................................... 37

69 7.2.11 Spare capacity ................................................................................................................ 37

70 7.2.12 Programmable component ............................................................................................. 37

71 7.3 Detailed practices - Software ................................................................................................. 37

72 7.3.1 General ........................................................................................................................... 37

73 7.3.2 Life-cycle ......................................................................................................................... 37

74 7.4 Features of software controlled equipment ............................................................................ 37

75 7.4.1 General ........................................................................................................................... 37

76 7.4.2 Self-test ........................................................................................................................... 37

77 7.4.3 Watchdog ........................................................................................................................ 37

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78 7.4.4 Failure indication ............................................................................................................. 37

79 7.4.5 Recovery ......................................................................................................................... 38

80 8 Electronic equipment not designed for use at rolling stock ........................................... 38

81 9 Components ......................................................................................................................... 38

82 9.1 Procurement ........................................................................................................................... 38

83 9.2 Application .............................................................................................................................. 38

84 10 Construction ......................................................................................................................... 39

85 10.1 Equipment construction ......................................................................................................... 39

86 10.1.1 General ........................................................................................................................... 39

87 10.1.2 Mechanical protection ..................................................................................................... 39

88 10.1.3 Polarization or coding ..................................................................................................... 39

89 10.1.4 Dimensional requirements .............................................................................................. 39

90 10.1.5 Integrated circuit sockets and edge connectors ............................................................. 40

91 10.1.6 Equipment cabling .......................................................................................................... 40

92 10.2 Component mounting ............................................................................................................. 41

93 10.2.1 General ........................................................................................................................... 41

94 10.2.2 Layout ............................................................................................................................. 41

95 10.2.3 Fixing .............................................................................................................................. 41

96 10.2.4 Component lead terminations ......................................................................................... 41

97 10.2.5 Pre-set control................................................................................................................. 41

98 10.2.6 Select on test components ............................................................................................. 41

99 10.3 Electrical connections ............................................................................................................ 41

100 10.3.1 General ........................................................................................................................... 41

101 10.3.2 Soldered connections ..................................................................................................... 41

102 10.3.3 Crimped connections ...................................................................................................... 42

103 10.3.4 Wire wrap connections ................................................................................................... 42

104 10.3.5 Other connections ........................................................................................................... 42

105 10.4 Internal flexible wiring (electrical and optical) ........................................................................ 42

106 10.5 Flexible printed wiring ............................................................................................................ 42

107 10.6 Printed circuit boards - flexible and rigid ................................................................................ 43

108 10.6.1 Holes ............................................................................................................................... 43

109 10.6.2 Printed circuit board acceptability ................................................................................... 43

110 10.6.3 Layout ............................................................................................................................. 43

111 10.6.4 Materials ......................................................................................................................... 43

112 10.7 Protective coatings for printed board assemblies .................................................................. 43

113 10.8 Identification ........................................................................................................................... 44

114 10.8.1 Bare PCB identification ................................................................................................... 44

115 10.8.2 Identification of subracks and printed board assemblies ................................................ 44

116 10.8.3 Mounting position of subracks and printed board assemblies ........................................ 44

117 10.8.4 Fuse and battery identification ........................................................................................ 44

118 10.9 Mounting ................................................................................................................................ 44

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119 10.10 Cooling and ventilation ........................................................................................................... 44

120 10.11 Materials and finishes ............................................................................................................ 44

121 10.12 Reworking, modification and repair of electronic assemblies ................................................ 45

122 11 Safety .................................................................................................................................... 45

123 11.1 General .................................................................................................................................. 45

124 11.2 Personnel safety .................................................................................................................... 45

125 11.3 Fire behaviour requirements .................................................................................................. 45

126 11.4 Functional safety .................................................................................................................... 45

127 12 Documentation ..................................................................................................................... 45

128 12.1 General .................................................................................................................................. 45

129 12.2 Supply and storage of documentation ................................................................................... 46

130 12.3 Datasheet ............................................................................................................................... 46

131 12.4 User and maintenance manual .............................................................................................. 46

132 12.5 Equipment installation documentation ................................................................................... 46

133 12.6 Commissioning documentation .............................................................................................. 47

134 12.7 Design documentation ........................................................................................................... 47

135 12.7.1 General ........................................................................................................................... 47

136 12.7.2 Block diagrams ............................................................................................................... 47

137 12.7.3 Wiring diagrams .............................................................................................................. 47

138 12.7.4 Cabling diagrams ............................................................................................................ 47

139 12.7.5 Interface specification ..................................................................................................... 47

140 12.7.6 Internal interface specification ........................................................................................ 47

141 12.7.7 Equipment drawings ....................................................................................................... 47

142 12.7.8 Documentation – Hardware ............................................................................................ 48

143 12.7.9 Non-repairable items list ................................................................................................. 49

144 12.7.10 Repair documentation ..................................................................................................... 49

145 12.7.11 Documentation – Software ............................................................................................. 50

146 12.7.12 Documentation – System ................................................................................................ 50

147 Testing .................................................................................................................................. 51

148 13.1 General .................................................................................................................................. 51

149 13.2 Categories of tests ................................................................................................................. 51

150 13.2.1 General ........................................................................................................................... 51

151 13.2.2 Type tests ....................................................................................................................... 52

152 13.2.3 Routine tests ................................................................................................................... 52

153 13.2.4 Investigation tests ........................................................................................................... 52

154 13.3 Tests summary ....................................................................................................................... 52

155 13.4 Test specification ................................................................................................................... 53

156 13.4.1 Visual inspection ............................................................................................................. 53

157 13.4.2 Performance test ............................................................................................................ 53

158 13.4.3 DC Power supply test ..................................................................................................... 54

159 13.4.4 Low temperature test ...................................................................................................... 58

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160 13.4.5 Dry heat test .................................................................................................................... 59

161 13.4.6 Low temperature storage test ......................................................................................... 62

162 13.4.7 Insulation test .................................................................................................................. 63

163 13.4.8 Cyclic damp heat test ..................................................................................................... 65

164 13.4.9 Electromagnetic compatibility test .................................................................................. 67

165 13.4.10 Salt mist test ................................................................................................................... 68

166 13.4.11 Vibration and shock test ................................................................................................. 68

167 13.4.12 Enclosure protection test (IP code)................................................................................. 69

168 13.4.13 Stress screening test ...................................................................................................... 69

169 13.4.14 Rapid temperature variation test..................................................................................... 69

170

Annex A (informative) List of default requirements of EN 50155 and related clauses .............. 70

171 Annex B (informative) TESTING APPROACH ................................................................................. 71

172 B.1 General .................................................................................................................................. 71

173

Table B.1 — Types of proof ............................................................................................................... 71

174 B.2 Situation of applicability ..................................................................................................... 71

175 B.3 General methodology .......................................................................................................... 71

176 General .................................................................................................................................. 71

B.3.1

177 Table B.2 — Procedures for integration / installation .................................................................... 72

178 Table B.3 — Procedures for re-verification and replacement........................................................ 72

179 Item specific procedures ..................................................................................................... 72

B.3.2

180 B.3.3 Equipment specific steps .................................................................................................... 72

181 B.4 Equipment integration design review ................................................................................ 73

182 Equipment integration type test ......................................................................................... 73

B.5

183 B.6 Equipment installation design review................................................................................ 73

184 B.7 Equipment installation type test ......................................................................................... 73

185 Equipment installation routine test .................................................................................... 73

B.8

186 B.9 Equipment periodic re-verification ..................................................................................... 73

187 B.10 Replacement of items and ancillary components ............................................................ 73

188

Figure B.1 — Integration / Installation steps ................................................................................... 74

189 Annex C (informative) Severity level of the service conditions in different rolling stock locations

190 75

191 C.1 General .......................................................................................................................................... 75

192

C.2 Severity of service conditions in different rolling stock types ............................................... 75

193 C.3 Intended use of rolling stock ................................................

...

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