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



Reference CLC/TS 50502:2008
Title Railway applications - Rolling stock - Electric equipment in trolley buses - Safety requirements and connection systems
Project Number 21426
Abstract/Scope This Technical Specification applies to electrical systems on board trolley buses, as defined in 1.3.1, fed with a nominal line voltage (Un) between 600 V d.c. and 750 V d.c. This Technical Specification defines the requirements and constructional hints, especially to avoid danger of electrical kind to the public and to the personnel. CLC/TS 50502 is normative only for vehicles ordered and designed after publication of the same. This Technical Specification covers vehicles intended for public transport of persons. It refers mainly to earthed networks, but reference is made also to galvanically insulated networks. Annexes B and C are related to the connection systems. The detailed scope of these annexes is given in Annex B.


Current Stage code 6060
Current Stage code date 2008-07-30
Current Stage code deadline  
Deadline date for vote 2008-11-30


Order Voucher  


IEC Technical Body  
Reference Document  
ICS 45.060.01 - Railway rolling stock in general
Keywords Railway; Rolling stock; Trolley bus; Connection; Safety
Note Based on Polish and German comments * Supersedes CLC/TS 50502:2007
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2008-07-30   export to doc file  EN
5099 2008-05-09 2008-09-09  
5060 2008-04-28 2008-05-09 export to doc file  EN
5020 2008-01-25 2008-04-25 export to doc file  EN
3090 2007-11-30 2007-12-30  
1099 2007-09-11 2008-03-11  
1000 2007-06-26 2007-09-12  

Implementation Dates

date of Ratification (DOR) (1) 2008-05-09
date of Availability (DAV) (2) 2008-07-30
date of Announcement (DOA) (3) 2008-11-09
date of Publication (DOP) (4) -
date of Withdrawal (DOW) (5) -


(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.