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



Reference prEN 50502:2013
Title Railway applications - Rolling stock - Electric equipment in trolley buses - Safety requirements and connection systems
Project Number 23686
Abstract/Scope This European Standard applies to electrical systems on board of vehicles of the type trolleybus, as defined in 1.3.1, fed with a nominal line voltage (Un) between 600 V d.c. and 750 V d.c. This European Standard defines the requirements and constructional hints, especially to avoid danger of electrical kind to the public and to the personnel. Where special requirements are existing for trolleybuses, hints are given for mechanical and functiona safety as well as for protection against fire. This European Standard covers vehicles intended for public transport of persons. This standard applies to - trolleybuses, - buses with current rail for guidance in the rod surface, - guided buses with bipolar roof current collector. This standard does not apply to - electric driven vehicles with internal power supply, - hybrid vehicles, - diesel - electric vehicles, - fuel - cell vehicles, - battery vehicles, - Vehicles with safe protective bonding, - rubber tired commuter trains, - guided buses with supply by a seperate current rail, - rail guided buses with unipolar roof current collector, - Vehicles operated outsid public accesible areas, - electric driven lorries on motorways. Guidance and current rails are special solutions and in this time are not under standardisation like trolleybus current collectors and overhed contact lines (OCL). It refers mainly to earthed networks, but reference is made also to galvanically insulated networks. Annex A is related to detailed design features for trolleybuses. Annexes B and C are related to the connection systems. The detailed scope of these annexes is given in Annex B.
Enquiry stage


Current Stage code 4060
Current Stage code date 2014-03-03
Current Stage code deadline 2014-03-24
Deadline date for vote  


Order Voucher  


IEC Technical Body  
Reference Document  
Keywords Railway; Rolling stock; Trolley bus; Connection; Safety
Note D139/C178: NWI approved * Revision of CLC/TS 50502:2008 * 2012-10-04: 9-month tolerance requested
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
4060 2014-03-03 2014-03-24 export to doc file  EN
4020 2013-09-27 2014-02-28 export to doc file  EN  FR  DE
3099 2013-07-11    
2020 2012-02-03    
1099 2011-10-01    
1000 2011-06-28 2011-09-30  

Implementation Dates

date of Ratification (DOR) (1)  
date of Availability (DAV) (2)  
date of Announcement (DOA) (3) -
date of Publication (DOP) (4) -
date of Withdrawal (DOW) (5) -


Supersedes CLC/TS 50502:2008
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.