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IEC 61991
Edition 2.0 2019-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Railway applications – Rolling stock –
Protective provisions against electrical hazards
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IEC 61991
Edition 2.0 2019-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Railway applications – Rolling stock –
Protective provisions against electrical hazards
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 45.060.01 ISBN 978-2-8322-6931-2
– 2 – IEC 61991:2019 RLV © IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 8
3.1 Terms and definitions . 8
3.1.1 Definitions concerning persons involved . 9
3.1.2 Other definitions . 9
3.2 Abbreviated terms . 13
4 Classification of voltage bands . 13
4.1 General principles . 13
4.2 Connections between circuits . 14
4.3 Exceptions . 15
5 Protective provisions against direct contact . 15
5.1 General . 15
5.2 Protection by insulation . 15
5.3 Protection by prevention of access . 16
5.3.1 Voltages in bands I to III . 16
5.3.2 Voltages in band IV . 17
5.4 Protection by the use of band I(ELV) . 18
5.4.1 Requirements for systems of band I (SELV and PELV) . 18
5.4.2 Additional requirements for SELV . 19
5.4.3 Additional requirements for PELV . 19
5.5 Warning labels . 19
6 Protective provisions against indirect contact . 19
6.1 General . 19
6.2 Protective bonding . 20
Equipotential connections .
6.2.1 General . 20
6.2.2 Equipotential bond . 20
6.2.3 Protective bonding rating . 20
6.2.4 Sliding contacts . 20
6.3 Disconnection of the supply . 20
6.3.1 Application . 20
6.3.2 Disconnection characteristic . 21
6.4 Vehicle Main protective bonding. 21
6.4.1 General . 21
6.4.2 Bonding paths . 21
6.4.3 Impedance . 22
6.4.4 Contact line fault . 22
6.5 Clarifications and exceptions with reference to indirect contact . 23
6.5.1 Parts requiring protective provisions . 23
6.5.2 Parts not requiring protective provisions . 23
6.5.3 Multi-stage insulation . 23
6.5.4 Floating supplies . 23
6.5.5 Insulated wheel or levitation systems without a protective conductor . 24
6.6 Additional requirements – Bearings . 24
7 Power circuit . 24
7.1 General principles . 24
7.2 Power circuit insulated from the vehicle body or bogie . 25
7.3 Power circuit using the vehicle body or bogie . 25
8 Additional requirements . 25
8.1 General . 25
8.2 Current collectors . 25
8.3 Capacitors . 26
8.4 Plug and socket devices . 26
8.4.1 Portable apparatus . 26
8.4.2 Vehicle and intervehicle connectors . 27
8.5 Special sources . 27
8.5.1 General . 27
8.5.2 Live parts not requiring protective provisions . 27
8.5.3 Live parts requiring protective provisions . 27
Annex A (normative) List of items where contracting parties shall choose
either a procedure or a mechanical device co-operate . 28
Annex B (informative) Special national conditions . 29
B.1 General . 29
B.2 France . 29
B.3 Great Britain . 29
B.3.1 Operate over 750 V DC third rail electrified lines . 29
B.3.2 Bonding between rail vehicle main body to bogie . 29
B.3.3 Intervehicle bonding . 30
B.4 Japan. 30
B.4.1 General . 30
B.4.2 [6.4.4] Contact line fault . 30
B.4.3 [8.4.1] Portable apparatus . 30
Annex C (informative) Example solutions for impedance management in electric
multiple units (EMUs) . 31
C.1 Preventing absorption of return current in EMUs . 31
C.2 Examples of solutions . 32
Bibliography . 33
Figure C.1 – Concentration of return current . 31
Figure C.2 – Attach earth resistors for long-length EMUs preventing current absorption . 31
Table 1 – Voltage bands . 14
Table 2 – Maximum impedance between each vehicle body of a unit and protective
conductor of the fixed installation . 22
Table B.1 – Voltage bands . 29
– 4 – IEC 61991:2019 RLV © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RAILWAY APPLICATIONS – ROLLING STOCK –
Protective provisions against electrical hazards
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreeme
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