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


Overhead electrical lines exceeding 1 kV a.c. (1,5 kV d.c.)



Reference EN 50341-1:2012
Title Overhead electrical lines exceeding AC 1 kV - Part 1: General requirements - Common specifications
Project Number 22540
Abstract/Scope This European Standard applies to new overhead electric lines with nominal system voltages exceeding AC 1 kV and with rated frequencies below 100 Hz. The extent of the application of this standard by each country in respect of existing overhead lines is subject to the requirements of the National Normative Aspects (NNA) applicable to that country. The specific definition as to the meaning and extent of a “new overhead line” is to be identified by each National Committee (NC) within their own NNA. At the least, it shall mean a totally new line between two points, A and B. Field of application This European Standard also applies to covered conductor overhead lines and overhead insulated cable systems with nominal system voltage exceeding AC 1 kV up to and including AC 45 kV and with rated frequencies below 100 Hz. Additional requirements and simplifications are specified that apply only for this voltage range. Design and construction of overhead lines with insulated conductors, where internal and external clearances can be smaller than specified in the standard, are not included for lines exceeding 45 kV. Other requirements of the Standard may be applicable, and where necessary NNAs should be consulted. This European Standard is applicable for optical Ground Wires (OPGWs) and optical Conductors (OPCONs). However the standard is not applicable to telecommunication systems which are used on overhead transmission lines either attached to the transmission line conductor/earth wire system (for example wraparound,...) or as separate cables supported by the transmission supports for example All Dielectric Self Supporting (ADSS) or for telecommunication equipment mounted on individual transmission line structures. When such cases are necessary, requirements can be given in the NNAs. This European Standard does not apply to:  overhead electric lines inside closed electrical areas as defined in EN 61936-1;  catenary systems of electrified railways, unless explicitly required by another standard. Structure of the European Standard EN 50341-1 Normative references, definitions and symbols with their significations are listed in Clause 2 below. In Clause 3, the basis of design according to this standard is given. The standard specifies in Clauses 4 to 6 the general requirements that shall be met for the structural and electrical design of overhead lines to ensure that the line is suitable for its purpose with due consideration given to safety of public, construction, operation, maintenance and environmental issues. Clauses 7 to 11 of this standard consider the structural and electrical requirements that shall be met for the design, installation and testing of overhead line components including supports, foundations, conductors, insulator strings and hardware as determined by the relevant design parameters of the line. Finally, Clause 12 considers the quality assurance requirements during design, manufacturing and construction. Flowchart 1.1 summarises the structure of the European Standard EN 50341-1 and its Clauses 1 to 12.


Current Stage code 6060
Current Stage code date 2012-12-21
Current Stage code deadline 2013-11-19
Deadline date for vote 2012-02-28


Order Voucher  


IEC Technical Body  
Reference Document  
ICS 29.240.20 - Power transmission and distribution lines
Keywords Overhead; Line
Note Supersedes EN 50341-1:2001 (PR=155) + A1:2009 (PR=21990) + EN 50423-1:2005 (PR=14245) * D138/025: NNAs in future Part 3 of the prEN should be finalized within 12 months after the availability of Part 1
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2012-12-21 2013-11-19 export to doc file  EN  DE
5099 2012-11-19 2012-12-17  
5060 2012-10-15 2012-11-05 export to doc file  EN
5020 2012-05-11 2012-10-12 export to doc file  EN  DE
4099 2012-03-29 2012-04-13  
2020 2010-10-06    
1099 2009-09-01 2010-09-01  
1000 2009-02-17 2009-08-31  

Implementation Dates

date of Ratification (DOR) (1) 2012-11-19
date of Availability (DAV) (2) 2012-12-21
date of Announcement (DOA) (3) 2013-05-19
date of Publication (DOP) (4) 2013-11-19
date of Withdrawal (DOW) (5) 2016-11-19


Supersedes EN 50341-1:2001
EN 50341-1:2001/A1:2009
EN 50423-1:2005
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.