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



Reference EN 50122-3:2010
Title Railway applications - Fixed installations - Electrical safety, earthing and the return circuit - Part 3: Mutual Interaction of a.c. and d.c. traction systems
Project Number 15152
Abstract/Scope This European Standard specifies requirements for the protective provisions relating to electrical safety in fixed installations, when it is reasonably likely that hazardous voltages or currents will arise for people or equipment, as a result of the mutual interaction of a.c. and d.c. electric traction systems. It also applies to all aspects of fixed installations that are necessary to ensure electrical safety during maintenance work within electric traction systems. The mutual interaction can be of any of the following kinds: – parallel running of a.c. and d.c. electric traction systems; – crossing of a.c. and d.c. electric traction systems; – shared use of tracks, buildings or other structures; – system separation sections between a.c. and d.c. electric traction systems. Scope is limited to basic frequency voltages and currents and their superposition. This European Standard does not cover radiated interferences. This European Standard applies to all new lines, extensions 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, and 5) magnetically levitated systems, which use a contact line system; c) material transportation systems. The 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 for railways; f) suspended cable cars; g) funicular railways; h) procedures or rules for maintenance. NOTE The rules given in this European Standard can also be applied to mutual interaction with non-electrified tracks, if hazardous voltages or currents can arise from a.c. or d.c. electric traction systems.


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; Fixed installation; Protective provisions; Mutual interaction
Note Initially based on BT(IT/NOT)72
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 2009-01-13 2009-04-13 export to doc file  EN
4020 2008-07-25 2009-01-09 export to doc file  EN
3099 2008-04-27 2008-07-29  
2060 2007-02-08 2007-11-30  
2020 2006-11-24 2007-02-28  
2020 2005-11-01 2007-02-23  
2020 2004-05-07 2006-12-31  
2020 2003-10-09 2004-04-09  
1000 2003-05-15 2003-11-15  
1090 2002-03-05 2004-03-05  

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


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.