SIST EN 50122-1:2022
(Main)Railway applications - Fixed installations - Electrical safety, earthing and the return circuit - Part 1: Protective provisions against electric shock
Railway applications - Fixed installations - Electrical safety, earthing and the return circuit - Part 1: Protective provisions against electric shock
1 - General
- adaptation of the Scope of this standard (include electrical safety related interface with vehicles, extension for electrified road transport – as shown above)
- Incorporate such small technical improvements from IEC 62128, made when transferring from previous version 50122-1, only insofar as these are essential for the coherence of the standard 50122-1
- Harmonize definitions with other railway standards (esp. EN 50119)
- check and redefine some definitions, harmonize with IEC 60050:
o Check and harmonize terms and definitions specific to railway terminology with IEC 60050 chapters 811 and 821. If modification of a definition is essential, consider harmonization with a recent definition used in a railway specific standard and which should postdate the IEC entry.
o Check and harmonize terms and definitions specific to electric shock with IEC60050 chapter 195 except where the terms and definitions in IEC 61140:2016 are appropriate and postdate IEC 60050 entry.
o Check and harmonise other terms and definitions with IEC 50050 where appropriate.
- Review and ensure the document accurately and consistently uses the correct ‘verbal forms for expressions of provisions’ (according to the Internal Regulations, Part 3, clause 7), the wording used is clear and achieves good differentiation between normative and informative content.
- Review and ensure the document’s content relating to the prevention of electric shock is harmonized with basic safety publication IEC/EN 61140. In particular, the IEC/EN61140 content on fundamental rules, terminology, protective provisions (i.e. basic protection, fault protection, enhanced protective provisions).
- Review and revise clause 1 to ensure that the document’s scope is clear and accurately stated, it is harmonised with the title and only aspects falling within this scope are included within the document’s normative content. This take note of the on-going SC9XC work on coordination between SC9XC / TC9X standards and in particular the scope of prEN 50488.
2 – Specific
- Review and modify clause 5 and harmonize its content with the relevant aspects of IEC61140, EN50124 series, prEN50488. Particular consideration to be given to the dimensioning of air clearance associated with protective provisions. This will take note of the on-going SC9XC work on coordination between SC9XC / TC9X standards.
- Review and revise clause 6, in particular the content on protective provisions to improve its alignment with basic safety publication IEC/EN 61140 content for this aspect.
- revision of Chapter 7
- Review and revise clause 10.5 to ensure that the content is fit for purpose and is coordinated with EN 50124, EN 50119 and EN5 0488 in particular, such that these standards will provide a coherent approach. This will take note of the on-going SC9XC work on coordination between these standards.
Bahnanwendungen - Ortsfeste Anlagen - Elektrische Sicherheit, Erdung und Rückleitung - Teil 1: Schutzmaßnahmen gegen elektrischen Schlag
This European Standard specifies requirements for the protective provisions relating to electrical safety in fixed installations associated with AC and/or DC traction systems and to any installations that can be endangered by the traction power supply system. This is including as well the requirements which are present at the interface with the live parts on the outside of the vehicles.
It also applies to all aspects of fixed installations that are necessary to ensure electrical safety during maintenance work within electric traction systems.
This European Standard applies to all new lines and to all major revisions to existing lines for the following electric traction systems:
a) railways;
b) guided mass transport systems such as
1) tramways,
2) elevated and underground railways,
3) mountain railways,
4) trolleybus systems
5) electric traction supplies for road vehicles, which use an overhead contact line system and
6) magnetically levitated systems, which use a contact line system;
c) material transportation systems.
This European Standard does not apply to
d) mine traction systems in underground mines,
e) cranes, transportable platforms and similar transportation equipment on rails, temporary structures (e.g. exhibition structures) in so far as these are not supplied directly or via transformers from the contact line system and are not endangered by the traction power supply system,
f) suspended cable cars,
g) funicular railways.
This European Standard does not specify working rules for maintenance.
Applications ferroviaires - Installations fixes - Sécurité électrique, mise à la terre et circuit de retour - Partie 1: Mesures de protection contre les chocs électriques
Le présent document spécifie les exigences relatives aux dispositions de protection concernant la sécurité électrique des installations fixes associées à des systèmes de traction en courant alternatif et/ou continu et dans toutes les installations susceptibles d'être affectées par le système d'alimentation électrique de trac-tion. Il couvre également les exigences applicables aux véhicules opérant sur des voies électrifiées.
Le présent document s'applique également à tous les aspects des installations fixes, qui sont nécessaires pour assurer la sécurité électrique pendant les travaux de maintenance réalisés au sein des systèmes d'ali-mentation électrique de traction.
Le présent document s'applique aux nouveaux systèmes d'alimentation électrique de traction et aux révi-sions majeures des systèmes d'alimentation électrique de traction pour :
a) les réseaux ferroviaires ;
b) les réseaux de transport en commun guidés tels que :
1) les tramways ;
2) les voies ferroviaires aériennes et souterraines ;
3) les voies ferroviaires de montagne ;
4) les systèmes de trolleybus ;
5) les systèmes d'alimentation électrique de traction des véhicules routiers, qui utilisent un système de ligne aérienne de contact ; et
6) les systèmes à sustentation magnétique, qui utilisent un système de ligne de contact ;
c) les systèmes de transport de matériaux.
Le présent document ne s'applique pas aux :
a) systèmes d’alimentation électrique de traction des mines souterraines ;
b) grues, plateformes transportables et autres matériels de transport similaires sur rails, structures tempo-raires (dans les foires et expositions, par exemple) lorsqu'ils ne sont pas alimentés par les lignes aé-riennes de contact, directement ou par des transformateurs, ni affectés par le système d'alimentation électrique de traction ;
c) téléphériques, télécabines ;
d) funiculaires à câbles,
e) véhicules existants.
Le présent document ne spécifie pas les règles de travail pour la maintenance.
Les exigences du présent document relaives à la protection contre les chocs électriques sont applicables aux personnes physiques uniquement.
Železniške naprave - Fiksni postroji - Električna varnost, ozemljitev in povratni tokokrog - 1. del: Zaščitni ukrepi proti električnemu udaru
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50122-1:2022
01-december-2022
Nadomešča:
SIST EN 50122-1:2011
SIST EN 50122-1:2011/A1:2011
SIST EN 50122-1:2011/A2:2017
SIST EN 50122-1:2011/A3:2017
SIST EN 50122-1:2011/A4:2017
SIST EN 50122-1:2011/AC:2012
SIST EN 50122-1:2011/AC:2013
Železniške naprave - Fiksni postroji - Električna varnost, ozemljitev in povratni
tokokrog - 1. del: Zaščitni ukrepi proti električnemu udaru
Railway applications - Fixed installations - Electrical safety, earthing and the return circuit
- Part 1: Protective provisions against electric shock
Bahnanwendungen - Ortsfeste Anlagen - Elektrische Sicherheit, Erdung und Rückleitung
- Teil 1: Schutzmaßnahmen gegen elektrischen Schlag
Applications ferroviaires - Installations fixes - Sécurité électrique, mise à la terre et circuit
de retour - Partie 1: Mesures de protection contre les chocs électriques
Ta slovenski standard je istoveten z: EN 50122-1:2022
ICS:
13.260 Varstvo pred električnim Protection against electric
udarom. Delo pod napetostjo shock. Live working
29.280 Električna vlečna oprema Electric traction equipment
SIST EN 50122-1:2022 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50122-1:2022
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SIST EN 50122-1:2022
EUROPEAN STANDARD EN 50122-1
NORME EUROPÉENNE
EUROPÄISCHE NORM September 2022
ICS 29.280 Supersedes EN 50122-1:2011; EN 50122-
1:2011/A1:2011; EN 50122-1:2011/AC:2012; EN 50122-
1:2011/A2:2016; EN 50122-1:2011/A3:2016; EN 50122-
1:2011/A4:2017
English Version
Railway applications - Fixed installations - Electrical safety,
earthing and the return circuit - Part 1: Protective provisions
against electric shock
Applications ferroviaires - Installations fixes - Sécurité Bahnanwendungen - Ortsfeste Anlagen - Elektrische
électrique, mise à la terre et circuit de retour - Partie 1: Sicherheit, Erdung und Rückleitung - Teil 1:
Mesures de protection contre les chocs électriques Schutzmaßnahmen gegen elektrischen Schlag
This European Standard was approved by CENELEC on 2022-07-25. 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,
Türkiye 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
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50122-1:2022 E
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SIST EN 50122-1:2022
EN 50122-1:2022 (E)
Contents Page
European foreword . 7
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 10
3.1 Electrical safety and hazards . 10
3.2 Earthing and equipotential bonding . 12
3.3 Return circuit. 14
3.4 Electric traction power supply system . 16
3.5 Contact line . 17
3.6 Corrosion and corrosion protection . 20
3.7 Current collection . 20
3.8 Residual current devices . 21
3.9 General terms . 21
4 Contact line zone and current collector zone . 24
4.1 Overhead contact line . 24
4.2 Ground level conductor rail . 27
4.3 Trolleybuses and road vehicles using an overhead contact line . 27
4.4 Limitation of the zones . 28
5 Protective provisions against direct contact . 29
5.1 Preconditions . 29
5.1.1 General . 29
5.1.2 Design procedure . 29
5.1.3 Electrical clearances. 30
5.1.4 Standing surface . 31
5.2 Protection by clearance . 32
5.2.1 Calculation method for protection by clearance . 32
5.2.2 Dimensions of clearances . 33
5.2.3 Clearances for working persons . 35
5.2.4 Warning signs . 35
5.2.5 Minimum height of wires of an overhead contact line system above traffic areas . 36
5.2.6 Clearances above standing surfaces on vehicles . 36
5.2.7 Feeders above loading roads . 36
5.2.8 Clearance between live parts of overhead contact line systems and trees and bushes . 36
5.3 Protection by electrically protective obstacles . 36
5.3.1 General . 36
5.3.2 Common requirements for electrically protective obstacles . 37
5.3.3 Methods for determining reach . 38
5.3.4 Requirements for electrically protective obstacles . 40
5.3.5 Specific requirements for electrically protective obstacles in restricted areas . 46
5.3.6 Anti climbing provisions . 47
5.4 Protection against direct contact with live parts mounted on vehicles . 47
5.5 Protective provisions allowing working under live conditions . 48
5.5.1 General . 48
5.5.2 Overhead contact lines for railways beneath structures . 49
5.5.3 Overhead contact lines for trolley busses and electric road vehicles beneath structures . 49
2
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SIST EN 50122-1:2022
EN 50122-1:2022 (E)
5.6 Specific protective provisions against electric shock in ground level conductor rail systems . 51
5.6.1 Location of conductor rail at platforms . 51
5.6.2 Exceptions . 51
5.6.3 Protection provisions in workshops and depots . 51
5.6.4 Protective boarding for ground level conductor rails in restricted areas . 52
5.6.5 Requirements for top contact ground level conductor rails in public areas . 52
5.6.6 Requirements for top contact ground level conductor rails in restricted areas . 52
5.7 Specific protective provisions against electric shock in systems in which the wheels of the
vehicles are not used for return circuit . 55
5.7.1 General. 55
5.7.2 Railway systems . 55
5.7.3 Trolleybus systems and systems for electric road vehicles . 55
6 Protective provisions against indirect contact and non-galvanic coupling . 56
6.1 General . 56
6.2 Protective provisions for exposed-conductive-parts . 56
6.2.1 AC railways . 56
6.2.2 DC railways . 57
6.2.3 Exceptions for low voltage electric traction power supply systems . 57
6.2.4 Stays of non-conductive masts . 58
6.3 Protective provisions for wholly or partly conductive structures in the overhead contact line
zone or the current collector zone . 58
6.3.1 Protective provisions by means of connection to the return circuit . 58
6.3.2 Exceptions for small wholly and partly conductive parts . 59
6.3.3 Exceptions for temporarily stored parts close to the rails . 59
6.3.4 Protective provisions preventing contact between conductive parts and live parts . 59
6.3.5 Protective provisions by means of bare conductive parts connected to the return circuit . 60
6.3.6 Protective provisions by automatic disconnection of supply . 60
6.4 Parts which can become hazardous due to inductive or capacitive coupling . 60
7 Protective provisions for low voltage non-traction power supply systems . 60
7.1 General . 60
7.2 Protective provisions for electrical installations in the overhead contact line zone or the
current collector zone . 61
7.2.1 Equipment of protection Class I . 61
7.2.2 Equipment of protection Class II . 63
7.2.3 Cables . 63
7.2.4 Low voltage connected equipment . 63
7.3 Protective provisions for installations which are endangered by the traction power supply
return circuit . 63
7.3.1 Design of low voltage non-traction power supply . 63
7.3.2 Low voltage power supply by a TT system on the railway side . 64
7.3.3 Low voltage power supply by TN system . 67
7.3.4 Low voltage power supply by IT system . 69
7.3.5 Special provisions . 71
8 Protective provisions where track systems, which are utilized for carrying traction return
current, or/and overhead contact line systems pass through hazardous zones . 74
8.1 General . 74
8.2 Equipotential bonding . 75
8.3 Parallel pipework . 76
3
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SIST EN 50122-1:2022
EN 50122-1:2022 (E)
8.4 Insulating joints . 76
8.5 Surge arrester . 76
8.6 Overhead contact line of loading sidings . 77
9 Limits for touch voltage and protective provisions against the danger of rail potential . 77
9.1 General . 77
9.1.1 Preconditions . 77
9.1.2 Body voltage and touch voltage . 77
9.1.3 Touch voltage at vehicles . 77
9.1.4 Short-circuit duration . 78
9.1.5 Voltage limits and time duration aspects . 78
9.2 Touch voltage limits in AC railways . 78
9.2.1 General . 78
9.2.2 AC voltage limits for the safety of persons . 79
9.3 Touch voltage limits in DC railways . 82
9.3.1 General . 82
9.3.2 DC voltage limits for the safety of persons . 82
9.4 Access Control. 85
10 Additional requirements . 85
10.1 Traction substations and traction switching stations . 85
10.2 Cables . 85
10.2.1 General requirements . 85
10.2.2 Cables in AC electric traction power supply systems . 86
10.2.3 Cables in DC electric traction systems . 86
10.3 Extended return circuit connections and earthing conductors . 86
10.3.1 General requirements . 86
10.3.2 Continuity of the extended return circuit . 86
10.3.3 Cross bonding of the return circuit . 87
10.3.4 Railway systems in which the traction current is confined within insulated conductors . 87
10.4 Removing of decommissioned contact lines . 87
10.5 Means of achieving safe isolation between sections . 87
10.6 Lightning protection . 87
Annex A (normative) Clearances from standing surfaces for exceptional use on existing lines with
restricted gauge . 88
Annex B (informative) Typical layouts of protective obstacles . 90
B.1 General . 90
B.2 Examples . 92
Annex C (normative) Warning sign . 99
Annex D (informative) Guiding values for rail potential gradient . 100
D.1 AC railways . 100
D.2 DC railways. 101
Annex E (informative) Effective touch voltage and body voltage with respect to the body current . 102
E.1 Preconditions for the calculation . 102
E.2 Impedances . 102
E.3 Body current and related body voltage . 105
Annex F (normative) Measurement methods for effective touch voltages . 108
Annex G (normative) Use of voltage-limiting devices . 109
G.1 General . 109
4
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SIST EN 50122-1:2022
EN 50122-1:2022 (E)
G.2 Types . 109
G.3 Technical requirements . 109
Bibliography . 111
Figures
Figure 1 — Overhead contact line zone and current collector zone . 26
Figure 2 — Overhead contact line zone and current collector zone for trolley bus systems and
electric road vehicles using a bipolar contact line . 28
Figure 3 — Design procedure to achieve protection against direct contact. . 30
Figure 4 — Manikin model to be used for the analysis of the arm’s reach . 32
Figure 5 — Minimum distances to accessible live parts from standing surfaces accessible to persons . 34
Figure 6 — Application of taut string line method compared with manikin method. . 39
Figure 7 — Minimum distance behind electrically protective obstacles with openings . 42
Figure 8 — Example for a gap between a standing surface and an electrically protective obstacle,
side view . 44
Figure 9 — Effect of an electrically protective obstacle on arms reach of person including an object,
top view . 45
Figure 10 — Live parts below standing surfaces . 46
Figure 11 — Method for the determination of clearances for live parts on the outside of vehicles . 48
Figure 12 — Example of an insulated obstacle beneath a structure . 49
Figure 13 — Example of an insulated electrically protective obstacle beneath a structure for an
unearthed installation . 50
Figure 14 — Example of an insulated electrically protective obstacle beneath a structure for a bipolar
overhead contact line in which the negative contact wire is earthed or connected to the
return circuit of a tramway system . 51
Figure 15 — Public level crossing, private level crossing . 52
Figure 16 — Trackside structures . 53
Figure 17 — Track-side telephone mounted on a signal-post . 53
Figure 18 — Authorized trackside walking route . 54
Figure 19 — Railway controlled crossing (depots, goods yard, station crossing) . 54
Figure 20 — Protection Class I equipment installed outside the overhead contact line zone and the
current collector zone. . 62
Figure 21 — Typical TT system for AC railways. . 65
Figure 22 — Typical TT system for DC railways. . 66
Figure 23 — Typical TN system for AC railways . 68
Figure 24 — Typical TN system for DC railways. 69
Figure 25 — Typical IT system for AC railways . 70
Figure 26 — TN system for AC railways with interconnected earth system. . 72
Figure 27 — TN system for AC railways with multiple supply points. . 73
Figure 28 — Disposition of rail-to-rail cross bonds and track-to-track cross bonds (double-rail
illustration) and connection of the contact line in case of the loading siding having a contact
line . 76
Figure 29 — Location of a surge arrester outside the overhead contact line zone of a loading siding
if there is a possibility of flashovers of the insulating pieces through lightning strikes . 76
Figure 30 — Design of return circuit, with regard to permissible effective touch voltage by checking
the rail potential or the effective touch voltage . 79
Figure A.1 — Alternative clearances for existing lines/networks. . 89
Figure B.1 — Typical protective obstacles and obstacle combinations and their dimensions and
properties .
...
SLOVENSKI STANDARD
oSIST prEN 50122-1:2021
01-januar-2021
Železniške naprave - Stabilne naprave električne vleke - Električna varnost,
ozemljitev in povratni tokokrog - 1. del: Zaščitni ukrepi proti električnemu udaru
Railway applications - Fixed installations - Electrical safety, earthing and the return circuit
- Part 1: Protective provisions against electric shock
Bahnanwendungen - Ortsfeste Anlagen - Elektrische Sicherheit, Erdung und Rückleitung
- Teil 1: Schutzmaßnahmen gegen elektrischen Schlag
Applications ferroviaires - Installations fixes - Sécurité électrique, mise à la terre et circuit
de retour - Partie 1: Mesures de protection contre les chocs électriques
Ta slovenski standard je istoveten z: prEN 50122-1
ICS:
13.260 Varstvo pred električnim Protection against electric
udarom. Delo pod napetostjo shock. Live working
29.280 Električna vlečna oprema Electric traction equipment
oSIST prEN 50122-1:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 50122-1:2021
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oSIST prEN 50122-1:2021
EUROPEAN STANDARD DRAFT
prEN 50122-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2020
ICS 29.280 Will supersede EN 50122-1:2011 and all of its
amendments and corrigenda (if any)
English Version
Railway applications - Fixed installations - Electrical safety,
earthing and the return circuit - Part 1: Protective provisions
against electric shock
Applications ferroviaires - Installations fixes - Sécurité Bahnanwendungen - Ortsfeste Anlagen - Elektrische
électrique, mise à la terre et circuit de retour - Partie 1: Sicherheit, Erdung und Rückleitung - Teil 1:
Mesures de protection contre les chocs électriques Schutzmaßnahmen gegen elektrischen Schlag
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2021-02-19.
It has been drawn up by CLC/SC 9XC.
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,
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
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 68104 Ref. No. prEN 50122-1 E
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oSIST prEN 50122-1:2021
prEN 50122–1:2020 (E)
1C ontents
2 1 Scope . 6
3 2 Normative references . 6
4 Terms and definitions . 7
3
5 3.1 Electrical safety and hazards . 7
6 3.2 Earthing and equipotential bonding . 10
7 3.3 Return circuit . 11
8 3.4 Electric traction power supply system . 13
9 3.5 Contact line . 14
10 Corrosion and corrosion protection . 17
3.6
11 3.7 Current collection. 17
12 3.8 Residual current devices . 18
13 3.9 General terms . 18
14 4 Contact line zone and current collector zone . 20
15 4.1 Overhead contact line . 20
16 Conductor rail . 22
4.2
17 4.3 Trolleybuses and road vehicles using an overhead contact line . 23
18 4.4 Limitation of the zones . 24
19 5 Protective provisions against direct contact . 24
20 5.1 Preconditions . 24
21 5.1.1 General . 24
22 Design procedure . 25
5.1.2
23 5.1.3 Electrical clearances . 26
24 5.1.4 Standing surface . 26
25 5.2 Protection by clearance . 27
26 5.2.1 Calculation method for protection by clearance . 27
27 5.2.2 Clearances for fixed installations . 27
28 Exceptions for working persons . 29
5.2.3
29 5.2.4 Warning signs . 29
30 5.2.5 Minimum height of wires of an overhead contact line system above traffic areas . 29
31 5.2.6 Clearances above standing surfaces on vehicles . 30
32 5.2.7 Feeders above loading roads . 30
33 5.2.8 Clearance between live parts of overhead contact line systems and trees . 30
34 Protection by obstacles . 30
5.3
35 5.3.1 General . 30
36 5.3.2 Common requirements for obstacles . 30
37 5.3.3 Methods for determining reach . 31
38 5.3.4 Requirements for obstacles . 34
39 5.3.5 Specific requirements for obstacles in restricted areas . 39
40 Anti climbing provisions . 39
5.3.6
41 5.4 Protection against direct contact with live parts mounted on vehicles . 39
42 5.5 Protective provisions allowing working under live conditions . 40
43 5.5.1 General . 40
44 5.5.2 Overhead contact lines for railways or tramways beneath structures . 41
45 5.5.3 Overhead contact lines for trolley bus systems beneath structures . 41
46 Specific protective provisions against electric shock in conductor rail systems . 43
5.6
47 5.6.1 Location of conductor rail at platforms . 43
48 5.6.2 Exceptions . 43
2
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oSIST prEN 50122-1:2021
prEN 50122–1:2020 (E)
49 5.6.3 Protection provisions in workshops . 43
50 5.6.4 Protective boarding for conductor rails in restricted areas . 43
51 Requirements for top contact conductor rails in public areas . 44
5.6.5
52 5.6.6 Requirements for top contact conductor rails in restricted areas . 44
53 5.7 Specific protective provisions against electric shock in systems in which the wheels of the
54 vehicles are not used for return circuit . 46
55 5.7.1 General . 46
56 5.7.2 Railway systems . 46
57 Trolleybus systems . 47
5.7.3
58 6 Protective provisions against indirect contact and impermissible rail potential . 48
59 6.1 General . 48
60 6.2 Protective provisions for exposed conductive parts within the contact line zone or the
61 current collector zone . 48
62 6.2.1 AC traction systems . 48
63 DC traction systems . 48
6.2.2
64 6.2.3 Exceptions for low voltage traction systems . 48
65 6.2.4 Anchors of non-conductive masts . 49
66 6.3 Protective provisions for wholly or partly conductive structures . 49
67 6.3.1 Structures in the overhead contact line zone or the current collector zone . 49
68 6.3.2 Parts in the vicinity of the railways . 51
69 Protective provisions for low voltage non-traction power supplies . 51
7
70 7.1 General . 51
71 7.2 Protective provisions for electrical installations within the overhead contact line zone or the
72 current collector zon0 . 52
73 7.2.1 Equipment of protection Class I . 52
74 7.2.2 Equipment of protection Class II . 53
75 Cables . 53
7.2.3
76 7.2.4 Electrically protective screening . 54
77 7.2.5 Low voltage connected appliances . 54
78 7.3 Protective provisions for installations which are endangered by the traction power supply
79 return circuit . 54
80 7.3.1 Design of low voltage non-traction power supply . 54
81 Low voltage power supply by TT system . 55
7.3.2
82 7.3.3 Low voltage power supply by TN system . 58
83 7.3.4 Low voltage power supply by IT system . 60
84 7.3.5 Special provisions . 61
85 8 Protective provisions where track systems, which are utilized for carrying traction return
86 current, or/and contact line systems pass through hazardous zones . 64
87 General . 64
8.1
88 8.2 Equipotential bonding . 65
89 8.3 Parallel pipework . 65
90 8.4 Insulating joints . 66
91 8.5 Surge arrester. 66
92 8.6 Contact line of loading sidings . 66
93 Limits for touch voltage and protective provisions against the danger of rail potential . 66
9
94 9.1 General . 66
95 9.1.1 Rail potential . 66
96 9.1.2 Body voltage and touch voltage . 67
97 9.1.3 Touch voltage at vehicles . 67
98 9.1.4 Fault duration condition . 67
99 Voltage limits and time duration aspects. 67
9.1.5
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100 9.2 Touch voltage limits in AC traction systems . 67
101 9.2.1 General . 67
102 AC voltage limits for the safety of persons . 68
9.2.2
103 9.3 Touch voltage limits in DC traction systems . 71
104 9.3.1 General . 71
105 9.3.2 DC voltage limits for the safety of persons. 71
106 9.4 Access Control . 73
107 10 Additional protective provisions . 73
108 Traction substations and traction switching stations . 73
10.1
109 10.2 Cables . 73
110 10.2.1 General requirements. 73
111 10.2.2 Cables in AC electric traction power supply systems . 73
112 10.2.3 Cables in DC electric traction systems . 74
113 10.3 Return circuit connections and earthing conductors . 74
114 General requirements. 74
10.3.1
115 10.3.2 Continuity of the extended return circuit. 74
116 10.3.3 Cross bonding of the extended return circuit . 74
117 10.3.4 Railway systems in which the traction current is confined within insulated conductors . 75
118 10.4 Removing of decommissioned overhead contact lines . 75
119 10.5 Means of achieving safe isolation between sections . 75
120 Section insulators and insulation overlaps . 75
10.5.1
121 10.5.2 Isolating gaps . 75
122 10.6 Lightning protection . 75
123 Annex A (normative) Clearances from standing surfaces for exceptional use on existing lines with
124 restricted gauge . 76
125 Annex B (informative) Typical obstacle layouts . 77
126
Annex C (normative) Warning sign . 86
127 Annex D (informative) Guiding values for rail potential gradient . 87
128 Annex E (informative) Effective touch voltage and body voltage with respect to the body current . 89
129 Annex F (normative) Measurement methods for effective touch voltages . 94
130 Annex G (normative) Use of voltage-limiting devices . 95
131 Annex ZZ (informative) Relationship between this European Standard and the essential
132
requirements of EU Directive 2016/797/EU [2016 OJ L138] aimed to be covered . 96
133 Bibliography . 98
134
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135 European foreword
136 This document (prEN 50122-1:2020) has been prepared by CLC/SC 9XC “Electric supply and earthing sys-
137 tems for public transport equipment and ancillary apparatus (Fixed installations)”.
138 This document is currently submitted to the Enquiry.
139 The following dates are proposed:
• latest date by which the existence of this docu- (doa) dor + 6 months
ment has to be announced at national level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by endorse-
ment
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to be with- (to be confirmed or
drawn modified when voting)
140 This document will supersede EN 50122-1:2011 and all of its amendments and corrigenda (if any).
141 prEN 50122-1:2020 includes the following significant technical changes with respect to EN 50122-1:2011:
142 — some definitions were modified;
143 — the dimensions for protection by clearance were modified, especially there are now voltage dependent
144 differences for high voltage electric traction power supply systems;
145 — methods for the use of obstacles for protection by obstacle were significantly changed.
146 This document has been prepared under a mandate given to CENELEC by the European Commission and
147 the European Free Trade Association, and supports essential requirements of EU Directive(s).
148 For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this document.
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149 1 Scope
150 This document specifies requirements for the protective provisions relating to electrical safety in fixed installa-
151 tions associated with AC and/or DC traction systems and to any installations that can be endangered by the
152 electric traction power supply system. This also includes the requirements which are present at the interface
153 with the live parts on the outside of the vehicles.
154 It also applies to all aspects of fixed installations that are necessary to ensure electrical safety during mainte-
155 nance work within electric traction power supply systems.
156 This document applies to all new lines and to all major revisions to existing lines for the following electric
157 traction power supply systems:
158 a) railways;
159 b) guided mass transport systems such as
160 1) tramways,
161 2) elevated and underground railways,
162 3) mountain railways,
163 4) trolleybus systems
164 5) electric traction supplies for road vehicles, which use an overhead contact line system, and
165 6) magnetically levitated systems, which use a contact line system;
166 c) material transportation systems.
167 This document does not apply to:
168 d) mine traction systems in underground mines,
169 e) cranes, transportable platforms and similar transportation equipment on rails, temporary structures (e.g.
170 exhibition structures) in so far as these are not supplied directly or via transformers from the contact line
171 system and are not endangered by the electric traction power supply system,
172 f) suspended cable cars,
173 g) funicular railways.
174 This document does not specify working rules for maintenance.
175 2 Normative references
176 The following documents are referred to in the text in such a way that some or all of their content constitutes
177 requirements of this document. For dated references, only the edition cited applies. For undated references,
178 the latest edition of the referenced document (including any amendments) applies.
179 EN 50119:2020, Railway applications - Fixed installations - Electric traction overhead contact lines
180 EN 50122-2, Railway applications - Fixed installations - Electrical safety, earthing and the return circuit - Part
181 2: Provisions against the effects of stray currents caused by d.c. traction systems
182 EN 50124-1:2017, Railway applications - Insulation coordination - Part 1: Basic requirements - Clearances
183 and creepage distances for all electrical and electronic equipment
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1
184 EN 50153:2014, Railway applications – Rolling stock – Protective provisions relating to electrical hazards
2
185 EN 50163:2004, Railway applications – Supply voltages of traction systems
186 EN 50522:2010, Earthing of power installations exceeding 1 kV a.c.
3
187 EN 60529:1991 , Degrees of protection provided by enclosures (IP code) (IEC 60529:1989)
188 EN 60898-1:2019, Electrical accessories - Circuit-breakers for overcurrent protection for household and similar
189 installations - Part 1: Circuit-breakers for a.c. operation (IEC 60898-1:2016)
190 EN 61140:2016, Protection against electric shock - Common aspects for installation and equipment
191 (IEC 61140:2016)
4
192 EN 61936-1:2010, Power installations exceeding 1 kV a.c. – Part 1: Common rules (IEC 61936-1:2010)
193 EN 62305 (series), Protection against lightning (IEC 62305 series)
194 HD 60364 series, Low-voltage electrical installations (HD 60364 series)
5
195 HD 60364-4-41:2017, Low-voltage electrical installations – Part 4-41: Protection for safety – Protection
196 against electric shock (IEC 60364-4-41:2005, modified)
197 ISO 3864-1:2011, Graphical symbols — Safety colours and safety signs — Part 1: Design principles for safety
198 signs and safety markings
199 ISO 7010:2019, Graphical symbols — Safety colours and safety signs — Registered safety signs
200 3 Terms and definitions
201 For the purposes of this document, the following terms and definitions apply.
202 ISO and IEC maintain terminological databases for use in standardization at the following addresses:
203 — ISO Online browsing platform: available at https://www.iso.org/obp
204 — IEC Electropedia: available at http://www.electropedia.org/
205 3.1 Electrical safety and hazards
206 3.1.1
207 electrical safety
208 freedom from unacceptable risk of harm caused by electrical systems
209 3.1.2
210 electric shock
211 physiological effect resulting from an electric current passing through a human or animal body
212 [SOURCE: IEC 60050-195:1998, 195-01-04]
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