International Standards and Conformity Assessment for all electrical, electronic and related technologies



Reference EN 50122-2:2010
Title Railway applications - Fixed installations - Electrical safety, earthing and the return circuit - Part 2: Provisions against the effects of stray currents caused by d.c. traction systems
Project Number 16590
Abstract/Scope This European Standard specifies requirements for protective provisions against the effects of stray currents, which result from the operation of d.c. traction systems. As experience for several decades has not shown evident corrosion effects from a.c. traction systems and actual investigations are not completed, this European Standard only deals with stray currents flowing from a d.c. traction system. This European Standard applies to all metallic fixed installations which form part of the traction system, and also to any other metallic components located in any position in the earth, which can carry stray currents resulting from the operation of the railway system. This European Standard applies to all new d.c. lines and to all major revisions to existing d.c. lines. The principles may also be applied to existing electrified transportation systems where it is necessary to consider the effects of stray currents. It provides design requirements to allow maintenance. The range of application includes: a) railways, b) guided mass transport systems such as: 1) tramways, 2) elevated and underground railways, 3) mountain railways, 4) trolleybus systems, and 5) 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 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.


Current Stage code 6060
Current Stage code date 2010-10-15
Current Stage code deadline 2011-10-01
Deadline date for vote  


Directive(s) HSR (96/48/EC), CONRAIL (2001/16/EC), RAIL (2008/57/EC)
Order Voucher  


IEC Technical Body  
Reference Document  
ICS 29.120.50 - Fuses and other overcurrent protection devices
29.280 - Electric traction equipment
Keywords Railway; Earthing; Bonding; Stray current; Traction
Note Supersedes EN 50122-2:1998 + corr. Aug.2001 + A1:2002
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2010-10-15 2011-10-01 export to doc file  EN  FR
5099 2010-10-01 2011-02-01  
5061 2010-08-25 2010-10-01  
5060 2010-05-04 2010-06-04 export to doc file  EN
5020 2010-02-26 2010-04-30 export to doc file  EN
4099 2009-05-13 2010-03-22  
4060 2008-09-30 2008-11-04 export to doc file  EN
4020 2008-05-02 2008-09-26 export to doc file  EN
3099 2007-12-17 2008-05-19  
3099 2007-02-08 2007-12-21  
2020 2006-11-24 2007-02-28  
2020 2005-11-01 2007-02-23  
2020 2004-11-09 2005-05-09  
1000 2004-11-01 2005-05-01  

Implementation Dates

date of Ratification (DOR) (1) 2010-10-01
date of Availability (DAV) (2) 2010-10-15
date of Announcement (DOA) (3) 2011-04-01
date of Publication (DOP) (4) 2011-10-01
date of Withdrawal (DOW) (5) 2013-10-01


Supersedes EN 50122-2:1998
EN 50122-2:1998/corrigendum Aug. 2001
EN 50122-2:1998/A1:2002
Superseded by  
Normative reference (6)  

(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved

(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat

(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level

(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement

(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn

(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.