BS/EN 50341-2-13-2017 pdf download.Overhead electrical lines exceeding AC 1 kV
Part 2-13: National Normative Aspects (N NA) for ITALY (based on EN 50341-1:2012).
IT.1 Field of application
This standard specifies the general safety requirements, clarifies the actions that shall be carried out in the project and their relevant combinations, defines the characteristics of materials, products and any other aspects relevant to safety of electrical overhead lines as reported in the following clause 2. With reference to structural safety aspects, in absence of specific indications, and as an integration to this standard, the dispositions reported in Norme tecniche sulle costruzionr apply (see subclause 2.1).
For what concerns structural aspects this standard applies also to D.C. overhead lines.
For details concerning the application of this standard to telecommunication systems involving optical fibres either incorporated In or wrapped around earth- wires or conductors or suspended from overhead line supports, reference should be made to the Project Specifications.
2 Normative references, definitions and symbols
Normative references
(A-devj IT.1 National normative laws, government regulations
List of Law Decrees, Ministerial Decrees, Decrees of the President of the Minister’s Council:
— In the following text the new Italian Technical Standard, reported in the Ministerial Decree 14.01.2008 promulgated in force of article 5, subsection 2 of Law Decree 28 May 2004 n. 136 turned into law 27.07.2004 n. 186 and the articles 52 e 83 of D.P.R. 06.06.2001, n. 380, contained the “Testo Unico delle disposizioni legislative e regolamentari in materia edilizia will be referred as Norme tecniche sulle costruzionr.
– Decree of the President of the Ministers’ Council, 23 April 1992.
Limiti massimi di esposizione al campi elettrico e magnetico generati alla freguenza industriale nominale (50 Hz) negli ambienti abitativi e nell’ambiente esterno.
Maximum limits of exposure to power frequency (50 Hz) electric and magnetic
fields in inhabited buildings and external environment.
Decree of the Ministers of Public Works and of Internal Affairs, 16 January
1996.
Technical standard related to Criteri generali per Ia verifica di sicurezza delle costruzioni e del carichi a sovraccarichi”.
IT.2 National technical standards
List of Standard:
-CEI 103-6 (1997-12)
Protezione della linee di telecomunicazione agil effetti dell’induzione elettromagnetica provocata dalle linee elettriche vicine in caso di guasto. Protection of telecommunication lines against harmful effects produced by power lines in fault conditions
—CEI 7-1 (1997-09)
Norma per conduttori di rame e leghe di rame per linee elettriche aeree. Requirements for copper and copper-alloy conductors for electrical overhead lines.
—CEI 7-2 (1997-09)
Norme per conduttori di alluminlo, alluminio-acciaio, lega di alluminlo, a lega di alluminio-acciaio per linee elettriche aeree.
Requirements for all aluminium, aluminium-steel reinforced, all aluminium alloy and aluminium alloy-steel reinforced conductors for electrical overhead lines.
-CEI 7-6 (1997-04)
Norma per ii controllo della zincatura a caido per immersione su elementi di materiale ferroso destinati a ilnee e impianti e(ettrici.
Requirements for checking hot galvanizing by immersion on ferrous components used in lines and electrical Installations.
-CEI 7-10 (1997-09)
Norma per conduttori di accialo rivest Ito di rame a fib Ufl1CO ovvero cordati destinati a linee di telecomunicazione ad a linee di trasporto energia.
Requirements for copper clad steel conductors, single wire and stranded, for telecommunication and power lines.
-CEI 7-11 (1997-09)
Norme per conduttori di acciaio rivestito di alluminlo a fib unico e a corda per linee elettriche aeree.
Requirements for aluminium clad steel conductors, single wire and stranded, for electrical overhead lines.
—Guida CEI 36 (1997-1 0)
Resistenza meccanica residua di ale menti di catene di isolatori di vetro a di ceramica per linee aeree dopo ii danneggiamento meccanico delia parte isolante.
or snow formations on conductors or earth-wires, to the temperature effects, to erection and maintenance loads and to seismic events. The combination of the above actions is made according to the criteria indicated in the following in order to meet the required reliability of the lines.
Actions on lines due to ice, snow and wind loads with higher values than those reported in the following paragraphs can be prescribed in the Project Specification on the base of experimental data due to field observations with sufficient statistical numerosity.
4.3 Wind loads
4.3.1 Field of application and basic wind velocity
(A.dev) IT1 Wind load acting on overhead line
Wind load acting on overhead line components is based on the reference wind speed, defined in the following subclause, by applying factors that take into account gust wind phenomena, the terrain roughness and the height above ground.
lT.2 Reference wind speed
The reference wind speed. Vb, is defined as the maximum value, with a return period of 50 years. of the mean wind speed. in mis, over a period of 10 mm at a height of 10 m above the ground, on a terrain with exposition category II, as defined in “Norme tecniche suile costruzionl” and according to table 4.1 of
EN 50341-1.
The reference wind speed. as a function of site and of altitude above sea level shall be evaluated according to the specifications in the ‘Norme tecniche sulle costruzionr.
In order to calculate the wind speed for different return periods “Table B.1 –
Conversion factors for different return periods of wind speed” of EN 50341-1
shall be applied, where:BS/EN 50341-2-13-2017 pdf download.