BS EN 50341-2-13:2017 BSI Standards Publication Overhead electrical lines exceeding AC kV Part 2-13: National Normative Aspects (NNA) for ITALY (based on EN 50341-1:2012) BS EN 50341-2-13:2017 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 50341-2-13:2017 This standard, together with the following list of National Normative Aspect standards, supersedes BS EN 50423-3:2005 and BS EN 50341-3:2001: Country Code AT BE CH DE DK ES FI FR GB GR IE IS IT LU NL NO PT SE CZ EE PL SK Origin Ref Austrian National Committee Belgian National Committee Swiss National Committee German National Committee Danish National Committee Spanish National Committee Finnish National Committee French National Committee British National Committee Greek National Committee Irish National Committee Iceland National Committee Italian National Committee Luxemburg National Committee Nederland’s National Committee Norwegian National Committee Portuguese National Committee Swedish National Committee Czech National Committee Estonian National Committee Polish National Committee Slovak National Committee BS EN 50341-2-1 BS EN 50341-2-2 BS EN 50341-2-3 BS EN 50341-2-4:2016 BS EN 50341-2-5 BS EN 50341-2-6 BS EN 50341-2-7:2015 BS EN 50341-2-8 BS EN 50341-2-9:2015 BS EN 50341-2-10 BS EN 50341-2-11 BS EN 50341-2-12 BS EN 50341-2-13:2017 No NNA available BS EN 50341-2-15 BS EN 50341-2-16:2016 BS EN 50341-2-17 BS EN 50341-2-18 BS EN 50341-2-19:2015 BS EN 50341-2-20:2015 BS EN 50341-2-22:2016 BS EN 50341-2-23:2016 BS EN 50423-3:2005 and BS EN 50341-3:2001 will be withdrawn upon publication of the rest of the series The UK participation in its preparation was entrusted to Technical Committee PEL/11, Overhead Lines A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © The British Standards Institution 2017 Published by BSI Standards Limited 2017 ISBN 978 580 96535 ICS 29.240.20 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2017 Amendments/ccorrigenda issued since publication Date Text affected BS EN 50341-2-13:2017 EN 50341-2-13 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM January 2017 ICS 29.240.20 English Version Overhead electrical lines exceeding AC kV - Part 2-13: National Normative Aspects (NNA) for ITALY (based on EN 50341-1:2012) Lignes électriques aériennes dépassant kV en courant alternatif - Partie 2-13: Aspects normatifs nationaux (NNA) pour l'ITALIE (basés sur l'EN 50341-1:2012) This European Standard was approved by CENELEC on 2016-12-13 CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels © 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members Ref No EN 50341-2-13:2017 E BS EN 50341-2-13:2017 Italy - 2/32 - EN 50341-2-13:2017 Contents European foreword 4 Scope 1.1 General 1.2 Field of application Normative references, definitions and symbols 2.1 Normative references 2.2 Definitions 2.3 Symbols Basis of design 3.1 Introduction 3.2 Requirements of overhead lines Actions on lines 4.1 Introduction 4.3 Wind loads 4.5 Ice loads 12 4.6 Combined wind and ice or snow loads 13 4.7 Temperature effects 13 4.8 Security loads 15 4.9 Safety loads 16 4.11 Other special forces 16 4.12 Load cases 17 4.13 Partial factors for actions 18 Electrical requirements 18 5.6 Load cases for clearances calculation 18 5.8 Internal clearances within the span and at the top of the tower 18 5.9 External clearances 20 5.11 Electric and magnetic fields 23 Earthing systems 24 Supports 24 7.3 Lattice steel towers 24 7.5 Wood poles 25 7.10 Maintenance facilities 25 Foundations 25 8.1 Introduction 25 8.2 Basis of geotechnical design (EN 1997-1:2004 – Section 2) 25 Conductors and earth-wires 26 9.1 Introduction 26 9.2 Aluminium based conductors 26 BS EN 50341-2-13:2017 Italy - 3/32 - EN 50341-2-13:2017 9.3 Steel based conductors 26 9.4 Copper based conductors 26 9.6 General requirements 27 10 Insulators 27 10.7 Mechanical requirements 27 11 Hardware 28 11.6 Mechanical requirements 28 12 Quality assurance, checks and taking-over 28 Annex J 30 J.4 Buckling resistance of angle in compression (see 7.3.6.4) 30 J.5 Design resistance for bolted connections (see 7.3.8) 32 J.5.1 General 32 BS EN 50341-2-13:2017 Italy - 4/32 - EN 50341-2-13:2017 European foreword The Italian National Committee (NC) is identified by the following address: Italian Electrotechnical National Committee Via Saccardo 20134 Milano Italy Phone n° ++39 02 21006.1 Fax n° ++39 02 21006210 Committee 11/7 – Overhead electrical lines E-Mail cei@ceinorme.it The Italian NC has prepared this Part 2-13 (EN 50341-2-13) listing the Italian National Normative Aspects (NNA) under its sole responsibility and duly passed it through the CENELEC and CLC/TC 11 procedures NOTE: The Italian NC takes sole responsibility for the technically correct co-ordination of this NNA with EN 50341-1 It has performed the necessary checks in the frame of quality assurance/control However, it is noted that this quality control has been already made in the framework of the general responsibility of a standards committee under the national laws/regulations This NNA is normative in Italy and informative for other countries This NNA has to be read in conjunction with Part (EN 50341-1) All clause numbers used in this NNA correspond to those of Part Specific subclauses, which are prefixed “IT”, are to be read as amendments to the relevant text in Part Any necessary clarification regarding the application of this NNA in conjunction with Part 1, shall be referred to the Italian NC who will, in co-operation with CLC/TC 11, clarify the requirements When no reference is made in this NNA to a specific subclause, then Part applies In the case of “boxed values” defined in Part 1, amended values (if any), which are defined in this NNA, shall be taken into account in Italy However, any boxed value, whether defined in Part or in this NNA, shall not be amended in the direction of greater risk in a Project Specification The national Italian standards/regulations related to overhead electrical lines exceeding kV (AC) are listed in subclause 2.1/IT.1 and 2.1/IT.2 NOTE: All national standards referred to in this NNA will be replaced by the relevant European Standards as soon as they become available and are declared by the Italian NC to be applicable and thus reported to the secretary of CLC/TC 11 BS EN 50341-2-13:2017 Italy - 5/32 - Scope 1.1 General (ncpt) IT.1 EN 50341-2-13:2017 New overhead line This NNA (National Normative Annex) is only applicable to all new overhead lines equipped with bare conductors, covered conductors or cables, with voltages above 1kV AC This standard is not applicable to overhead lines preexisting before its coming into force and shall not be applied to maintenance or reconductoring; the standard can be applied in case of significant modifications of existing lines 1.2 (ncpt) Field of application 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 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 costruzioni” 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 earthwires or conductors or suspended from overhead line supports, reference should be made to the Project Specifications Normative references, definitions and symbols 2.1 Normative references (A-dev) 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 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 costruzioni” − Decree of the President of the Ministers’ Council, 23 April 1992 Limiti massimi di esposizione campi elettrico e magnetico generati alla frequenza 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 la verifica di sicurezza delle costruzioni e dei carichi e sovraccarichi” BS EN 50341-2-13:2017 Italy - 6/32 - EN 50341-2-13:2017 − Decree of the President of the Ministers’ Council, July 2003 “Fissazione dei limiti di esposizione, dei valori di attenzione e degli obiettivi di qualità per la protezione della popolazione dalle esposizioni campi elettrici e magnetici alla frequenza di rete (50 Hz) generati dagli elettrodotti” Prescription of the exposition limits, attention values and quality objectives for the protection of people from the expositions to electrical and magnetic fields at power frequency (50 Hz) (ncpt) IT.2 National technical standards List of Standard: − CEI 103-6 (1997-12) Protezione delle linee di telecomunicazione agli 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) Norme 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 alluminio, alluminio-acciaio, lega di alluminio, e 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) Norme per il controllo della zincatura a caldo per immersione su elementi di materiale ferroso destinati a linee e impianti elettrici Requirements for checking hot galvanizing by immersion on ferrous components used in lines and electrical installations − CEI 7-10 (1997-09) Norme per conduttori di acciaio rivestito di rame a filo unico ovvero cordati destinati a linee di telecomunicazione ed 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 alluminio a filo 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 (1997-10) Resistenza meccanica residua di elementi di catene di isolatori di vetro o di ceramica per linee aeree dopo il danneggiamento meccanico della parte isolante Residual strength of insulators units of glass or ceramic materials for overhead lines after mechanical damage of dielectric BS EN 50341-2-13:2017 Italy - 7/32 - EN 50341-2-13:2017 − CEI EN 50443 (2012-12) Effetti delle interferenze elettromagnetiche sulle tubazioni causate da sistemi di trazione elettrica ad alta tensione in corrente alternata e/o da sistemi di alimentazione ad alta tensione in corrente alternata Effects of electromagnetic interference on pipelines caused by high voltage a.c electric traction system and/or high voltage a.c power supply system − CEI UNI EN ISO/IEC 17065 (2012-12) (CEI 501-22) ex EN 45011 Valutazione della conformità - Requisiti per organismi che certificano prodotti, processi e servizi Conformity assessment – Requirements for bodies certifying products, processes and services 2.2 (A-dev) Definitions IT.1 Reference wind speed V b In this standard, the reference wind speed is referenced as V b and is in agreement with Eurocodice 1991-1-4 and “Norme tecniche sulle costruzioni” 2.3 (A-dev) Symbols IT.1 Reference wind speed V b Vb mean wind speed in agreement with Eurocodice 1991-1-4 and “Norme tecniche sulle costruzioni” Reference 4.3 IT1 (A-dev) Basis of design 3.1 Introduction (ncpt) IT.1 Design philosophy and approach The design philosophy of the Italian overhead lines shall be based on the limit state criterion of Eurocodes 1, 2, 3, 5, 7, The specific design approach to be used shall be specified in the Project Specifications 3.2 Requirements of overhead lines 3.2.2 Reliability requirements (ncpt) IT.1 Reliability of overhead lines In compliance with EN 50341-1 and in accordance with past experiences, the reliability of overhead lines shall be as follows: − Level 1: 50-years return period Higher reliability levels can be indicated in the Project Specifications Actions on lines 4.1 Introduction (ncpt) IT.1 Action on overhead lines Actions on overhead lines are due to the wind load, to the tensile load of conductors and earth-wires on angle supports, or, in case of breakage of conductors or earth-wires, to the weight of the components, to the weight of ice BS EN 50341-2-13:2017 Italy - 8/32 - EN 50341-2-13:2017 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 (A-dev) IT.2 Reference wind speed The reference wind speed, V b , is defined as the maximum value, with a return period of 50 years, of the mean wind speed, in m/s, over a period of 10 at a height of 10 m above the ground, on a terrain with exposition category II, as defined in “Norme tecniche sulle costruzioni” 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 costruzioni” 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: VT is the extreme wind speed with return period T; V 50 is the extreme wind speed with return period of 50 years The reference wind speed V b is obtained from maps in 3.3.2 of “Norme tecniche sulle costruzioni” Each zone is characterized by maximum mean wind speed per hour, defined as follow: V b = V b,0 for a s ≤ a Vb = V b,0 + k a(a s – a 0) for a s > a Where a s is the effective height above sea level in [m] Values for V b,0 , K a and a are reported in Table 3.3.I of “Norme tecniche sulle costruzioni” For altitudes a s > 1500 m, except for local conditions, properly documented and proven, it is assumed a s = 1500 m The zoning is represented in Figure 4.3/IT.2 (equivalent to Figure 3.3.1 of “Norme tecniche sulle costruzioni”) BS EN 50341-2-13:2017 Italy - 20/32 - EN 50341-2-13:2017 In such cases it is merely necessary that the spacing, in metres, between the conductors are not less than: (3,8 + D pp ) m for aluminium or aluminium alloy conductors; (3,2 + D pp ) m for other conductors The previous requirements are not applicable to conductor in bundles or to single sub-conductors of the same bundle For loading case 1a of subclause 4.2.10.2, but with and conductor temperature of 15°C, the spacing d, in metres, shall not be less than D 50Hz_p_e ; for overhead lines voltage with voltages ≤ 45 kV, a distance if 0,11 x U n /45 (m) is assumed At conductor temperature of 15°C, with a wind speed of 7,5 m/s, the spacing d, in metres, shall not be less than k x D el with k = 0,75 The above requirements shall not apply to any insulation spark gaps for coordination 5.9 (A-dev) External clearances IT.1 Height of conductors above ground and non navigable waters In view both of the risk of discharge and of the possible effects, caused by exposition to electrical and magnetic fields, the conductors of the lines under the temperature conditions f) of subclause 4.7 and in loading case 2a of subclause 4.12.2, shall not be vertically spaced, in any points, from the ground or from non navigable stretches of lagoons and lakes, less than the following: (5 + D el ) m and, in any case, not less than metres, where D el is the voltage dependent minimum clearance (phase-earth) in metres The specified clearances refer to intact conductors on all spans and shall be measured apart from any layer of ice or snow, vegetation and from unevenness in the ground due to cultivation Clearances not need to be checked in case of conductors breakage or of unevenly loaded conductors The above requirements may not be complied with in case of lines passing over enclosed land with access reserved for authorised electrical personnel In addition to the above verifications, the conductors shall be vertically spaced from the ground in order to respect the limits of the “Decree of President of minister’s council July 2003” (A-dev) IT.2 Crossing For the purpose of this standard, a given structure is crossed when the vertical projection of at least one of the electrical power line conductors intersects the structure under the conditions reported in 4.7 f) (with vertical catenary) and g) (with swung catenary) and in load case 2a of subclause 4.12.2, assuming the plane of the catenary forming an angle of 30° with the vertical (A-dev) IT.3 Clearances The conductors and the earth-wires of overhead power lines, under the conditions reported in 4.7 (with vertical catenary) and g) (with swung catenary) and in load cases of subclause 4.12.2, with both vertical catenary and catenary forming an BS EN 50341-2-13:2017 Italy - 21/32 - EN 50341-2-13:2017 angle of 30° with respect to the vertical, shall not be spaced, in any points at a distance less than: a) (9 + D el ) m from the surface of motorways, trunk roads and provincial roads (and stretches of these in built-up areas), from the rail surface of railways, tramways, and terrestrial cable railways and from the normal medium water level of nd class navigable river (royal Decree n° 823, June 1911 and royal Decree n° 959, 11 July 1913) This distance is reduced to (7 + D el ) m for lines with voltage ≤ 45 kV The height of conductors above lake or lagoon areas crossed by boats shall be prescribed by the appropriate authority b) (6,5 + D el ) m from the rail surface of private terrestrial cable railways used exclusively for goods transport c) (4,4 + D el ) m, with a minimum of m, from the nearest part (or the nearest possible position of its moving parts) of public or private cableways, ski-lifts and chair-lifts, cable transporting systems, cantilever wires or simple cable systems The requirements shall not apply to supply and telephone lines used with cableways, which are covered by the following points d) and e) d) (2 + D pp ) m from the conductors of other electrical power or telephone lines (being D pp the minimum withstand distance (phase-phase) of the higher voltage line) This minimum shall be reduced to (1,75 + D pp ) m for earth-wires or when both the conductors concerned are fixed to the support using pin or dead end cap and pin insulator arrangement Where electrical power lines cross each others, the swing of the upper and lower span shall be taken into account separately but not simultaneously Clearance from telephone conductors shall be (3 + D el ) m (where D el is the voltage dependent minimum clearance (phase-earth) in metres) e) (3,5 + D el ) m from the supports of other electrical power or telephone lines This minimum may be reduced to (1 + D el ), in case of agreement between the owners of the two lines The distance from the electrical traction system conductors of railways, tramways, trolleybus lines and terrestrial cable railways shall be of (4,4 + D el ) m This latter requirement shall not apply to the clearance between conductors of electrical traction systems and conductors of electrical power lines placed on railway areas These requirements shall apply to the clearances from radio and television receiving antennas of private users f) (3,5 + D el ) m from every position, that can be stood on, of other structures or of the surrounding land, excluding buildings This requirement shall apply even in case of underpasses of bridges and viaducts g) (1,5 + D el ) m from every position, that cannot be stood on, of other structures or of the surrounding land, excluding buildings, and branches of trees It is considered that a position can be stood on if a normal person can stand without difficulty, even if to reach it positions that cannot be stood on have to be crossed The above clearances shall be checked with intact conductors on all spans and shall be measured apart from any layer of ice or snow, vegetation and on the unevenness in the ground due to cultivation Clearances not need to be checked in case of conductors breakage or of unevenly loaded conductors The above requirements may not be complied with in case of lines passing over enclosed land with access reserved for authorized electrical personnel (A-dev) IT.4 Clearances to buildings In view of the risk of discharge and of the possible effects caused by exposition to electrical and magnetic fields, the conductors of the lines, under the BS EN 50341-2-13:2017 Italy - 22/32 - EN 50341-2-13:2017 conditions reported 4.7 f) (with vertical catenary) and g) (with swung catenary) and in load case 2a of subclause 4.12.2, shall not be spaced, in any points, from buildings, less than the following distances: (4,0 + Del) m with vertical catenary; (2 + Del) m with catenary forming an angle of 30° with respect to the vertical In addition to the above mentioned verifications, the clearances shall respect the limits of the “Decree of President of minister’s council July 2003” (A-dev) IT.5 Angle at which electrical power lines cross structures When an electrical power line crosses a railway or tramway on its own land, excluding dead-end and works sidings, a public terrestrial cableway, ski-lift or chair-lift or a trunk road or motorway, the angle between the power line and the centre-line of the track, cableway or road shall not be less than: 15° for lines with voltages > 45 kV; 30° for lines with voltages up to and including 45 kV The above prescriptions shall not apply in case of crossings in built-up areas In exceptional cases, when the angle cannot be maintained within the above mentioned limits because of particular local conditions, the owner or licensor of the structure crossed may grant an exception to the above mentioned requirement When structures other than those listed above are crossed, the angle shall be subjected to any limitations (A-dev) IT.6 Crossing of underground electrical power or telephone cables The requirements of this standard shall not be applied to the line spans which over pass other underground electrical power or the telephone cables (A-dev) IT.7 Particular requirements for lines with not self supporting towers Under the conditions reported into the load cases 1a and of subclause 4.12.2, with both vertical catenary and catenary forming an angle of 30° with respect to the vertical, the conductors and the earth-wires shall not be spaced less than the minimum distances reported in 5.9/IT.1, IT.3 and IT.4 from the ground, from not navigable waters, from the crossed installations and the buildings (A-dev) IT.8 Clearances to supports These clearances are indicated on the base of experience acquired in construction and maintenance of overhead lines and on the base of legislative requirements; different values can be adopted in particular cases upon agreement of the competent Authorities and Agencies involved Supports of electric lines and relevant foundations shall not be horizontally spaced, in any point, above ground surface, less than: a) m from the nearest rail of railways and tramways on its own land, outside inhabited areas, excluding dead-end and works sidings, with a minimum of m from the edges of trenches and m from the base of raised b) m from the nearest rail of terrestrial cable railways, from the nearest contact conductor of trolleybus lines (outside inhabited areas), from the nearest part (or the nearest possible position of its moving parts) of public or private BS EN 50341-2-13:2017 Italy - 23/32 - EN 50341-2-13:2017 cableways, ski-lifts and chair-lifts for public or private people transportation service (with the exclusion of supply and telephone lines used with cableways) c) m from the nearest rail of railways and tramways, on its own land or on roads, inside inhabited areas and for dead-end and works sidings also outside inhabited areas, from the nearest contact conductor of trolleybus lines inside inhabited areas, from the nearest part (or the nearest possible position of its moving parts) of public or private cableways, ski-lifts and chair-lifts, cable transporting systems, cantilever wires or simple cable systems d) 15 m from the edge (article point 10 of law decree 30/04/1992 n 285 and following modifications and integrations) of main communication roads, this distance can be reduced to the height of the support (above ground) in case of lines ≤ 45 kV e) 25 m from the edge of state roads f) m from the edge of provincial roads outside inhabited areas; this distance can be reduced to 2/5 of the height of the support (above ground) in case of lines up with voltages ≤ 45 kV Smaller distances can be adopted inside inhabited areas, even with the installation on sidewalks, upon agreement with the board owner of the road g) m from the edge of communal roads outside inhabited areas Smaller distances can be adopted inside inhabited areas, even with the installation on sidewalks, upon agreement with the board owner of the road Moreover supports, relevant foundations and earth electrodes, shall not be spaced, in any point, less than: h) m from gas pipeline with maximum service pressure ≥ than 25 atmospheres, this minimum distance is reduced to m in case the pipeline, in the area of approaching the electrical line, is contained inside a robust protection tube, whose extremities are equipped with vents at a distance ≥ 6,5 m from supports and relevant auxiliary parts i) m from gas pipelines with maximum service pressure < 25 atmospheres, this minimum distance is reduced to 1,5 m in case the pipeline, in the area where it approaches the electrical line, is contained inside a robust protection tube, whose extremities are equipped with vents at a distance ≥ 2,5 m from supports and relevant auxiliary parts No clearance requirement is given for lines in cables, with voltage ≤ 45 kV, for public illumination lamps from “vicinali” roads In case of overhead line structures supporting also public illumination lamps, and as an exception to points d), e), f) and g) of this subclause, the distances prescribed by the execution and implementation regulation of the new Rules of the road (legislative decree 30 April 1992, n 288 and subsequent modifications or integrations), related to vertical traffic signs, apply Support shall not be spaced from conductors of other electrical or telecommunication lines less than the distances reported in 5.9 IT.3 e) Between supports of electrical lines and telecommunication lines conductors distances reported in 5.9 IT.3 e) apply In case of line supports holding public illumination lamps, the above distances of points h) and i) can be reduced upon agreement with the boards owner of the pipeline 5.11 (A-dev) Electric and magnetic fields IT.1 Maximum limits of exposure to power frequency electric and BS EN 50341-2-13:2017 Italy - 24/32 - EN 50341-2-13:2017 magnetic fields in inhabited buildings and external environment The limits and criteria are fixed by the “Decree of President of minister’s council July 2003 5.11.3 (ncpt) Interference with telecommunication circuits IT.1 Interference with telecommunication circuits and metallic pipelines Interference with telephone lines is covered by Italian CEI 103-6 Interference with metallic pipelines is covered by Italian CEI EN 50443 (ncpt) IT.2 Overhead electrical lines and irrigation splinkers In every operating conditions of irrigation systems, the continuous flow of liquid shall not enter into the guard zone assigned inside each conductor or bundle sub-conductor Such area in every point in the plane normal to the conductor, has a circular cross section with its centre concentric with the conductor and a radius, in meters, not less than: d g = 1,8 D el with a minimum of m The above requirements are not applicable to overhead cable lines (ncpt) Earthing systems IT.1 Earthing of supports and other structures All the supports not directly driven into ground shall be individually earthed Earth electrodes with a total soil contact surface of at least 0,25 m shall be sufficient for earthing Earth conductors shall have a cross-section of not less than 16 mm if made of copper and 50 mm if made of another material With reinforced concrete supports, the earth conductor shall be connected to the metallic fixing of pin insulators and suspension insulator chains, and shall run down inside hollow supports, and shall be protected against theft when running down solid supports The reinforcing steel of reinforced concrete supports may be used as an earth conductor, provided the existence of metallic continuity Metallic stays shall be either earthed or insulated by insulators inserted in the stay at an height greater than m above ground In case of underpasses of bridges or viaducts, in which clearances of 5.9 IT.2 f) cannot be met, the conductors shall be protected with suitable shelters or enclosures, that if metallic shall be earthed Lines that underpass structures indicated in 5.9 IT.2 c) shall be protected in the underpass span with suitable shelters, that if metallic shall be earthed Supports 7.3 Lattice steel towers 7.3.6 Ultimate limit states BS EN 50341-2-13:2017 Italy - 25/32 - EN 50341-2-13:2017 7.3.6.4 Buckling resistance of members in compression (ncpt) 7.3.8 (ncpt) 7.5 IT.1 see annex J4 IT.1 Resistance of connections IT.1 see annex J5.1 IT.1 Wood poles 7.5.5.1 Basis (ncpt) IT.1 Partial factors and calculation of loading capacity For ultimate state limits, the partial factors γ M shall be assumed as follow: resistance between cross sections and elements γ M1 = 1,50 resistance of junctions γ Mu = 1,50 The calculation of the loading capacity of a connection, realized by means of cylindrical leg type junctions, shall take into account, moreover, the type and the ultimate load-carrying capacity of the single junction means, or the type of junctions (wood-wood, panels-wood, steel-wood), the number of resistant sections and, in case of connection realized with more than one elementary junction, the way a single junction alignment is implemented 7.10 Maintenance facilities 7.10.3 Safety requirements (ncpt) IT.1 Requirements against climbing the supports and warning notices Devices shall be provided on supports that prevent not authorized people to climb over, except for operational reasons Supports shall be equipped with material obstacles (strings or barbed wire, metal spikes or similar) for indicating the banging access The obstacle must be such that there is no way to overcome it without a deliberate purpose The application of obstacles is not required for cylindrical or truncate-conical supports with a larger base diameter of 200 mm, both metallic and reinforced concrete, and for the poles fixed to buildings but not accessible from the rooftops Supports are also equipped with appropriate notices, to warn of danger due to the presence of live parts Foundations 8.1 Introduction (ncpt) IT.1 Reciprocal connections in foundations for lattice tower According to EN 50341-1, foundations for lattice tower with steel profiles, bolted connections with separate footings, can be realized without reciprocal connections 8.2 Basis of geotechnical design (EN 1997-1:2004 – Section 2) 8.2.1 Geotechnical design by calculation (ncpt) IT.1 Dimensioning and verifications of foundations As regard to peculiar aspects of overhead electrical lines, the dimensioning and verifications of foundations shall be carried out on the base of consolidated methods and models of geotechnical engineering, in the respect of design BS EN 50341-2-13:2017 Italy - 26/32 - EN 50341-2-13:2017 approaches and minimum safety requirements according to (subclause and Annex M) and this standard IT.2 (ncpt) EN 50341-1 Foundation on a slope soil In case of foundation on a slope soil, the verifications on slope shall be performed on the base of consolidated methods and models of geotechnical engineering, in the respect of design approaches and minimum safety requirements according to EN 50341-1 (subclause and Annex M) and this standard 8.2.3 Design by prescriptive measures IT.1 (ncpt) Geotechnical design by prescriptive measures For the single stem supports of overhead lines < 45 kV, practical rules of proven effectiveness can be used, provided that the geotechnical conditions of the soil volume which is affected in a significant way by supports are carefully evaluated and justified Conductors and earth-wires 9.1 Introduction IT.1 (ncpt) Overhead electrical lines with bare conductors With reference to dimensioning of conductors and earth-wires, the overhead electrical lines with bare conductors shall be designed according to EN 50341-1 and to this standard IT.2 (ncpt) Maximum temperatures Requirements related to the maximum temperatures, at which the different type of conductors can operate, are reported in the following subclauses 9.2.3, 9.3.3 and 9.4 For conductors with high thermic limit, maximum temperature for preserving the mechanical characteristics of conductor and accessories, is determined on the base of proprieties of materials constituting the conductor itself and shall be indicated in the project specifications 9.2 Aluminium based conductors 9.2.3 Conductor service temperature and grease characteristics IT.1 (ncpt) Temperatures for aluminium and aluminium alloy conductors in service For verifications with the maximum temperature method, the conductor temperature in normal service is 75°C maximum For verifications with the limit states method, the extreme conductor temperature for short term loadings is 96°C 9.3 Steel based conductors 9.3.3 Conductor service temperature and grease characteristics (ncpt) IT.1 Temperatures for aluminium-steel conductors in service For verifications with the maximum temperature method, the conductor temperature in normal service is 75°C maximum For verifications with the limit states method, the extreme conductor temperature for short term loadings is 96°C 9.4 (ncpt) Copper based conductors IT.1 Temperatures for copper conductors in service BS EN 50341-2-13:2017 Italy - 27/32 - EN 50341-2-13:2017 For verifications with the maximum temperature method, the conductor temperature in normal service is 75°C maximum For verifications with the limit states method, the extreme conductor temperature for short term loadings is 96°C 9.6 General requirements 9.6.2 Partial factor for conductors (ncpt) IT.1 Mechanical resistance of the joints In spans where joints are installed, the electrical resistance of conductor shall not be increased; the mechanical resistance of the joints shall not be lower than 90 % of the mechanical resistance of conductor In the spans overcrossing railways or tramways, trolleybus lines, terrestrial funiculars and public or private service cableways for people transport, ski-lifts and chair-lifts, motorways, state roads and their parts inside inhabited areas and communication lines, joints which are not of approved and certified type for the prescribed mechanical strength by qualified institutes conforming to CEI UNI EN ISO/IEC 17065 shall not be allowed 10 Insulators 10.7 Mechanical requirements (ncpt) IT.1 Rigid insulators Insulators can be either made of glass, ceramic or composite materials Insulators shall be designed, chosen and tested to meet electrical and mechanical requirements as prescribed by the design parameters of the overhead lines The partial factor for rigid insulators and relevant pins, under load cases of subclause 4.12.2, with intact conductors over all the spans, is indicated in EN 50341-1 (ncpt) IT.2 Suspended insulators The partial factor for suspended insulators, under load cases of subclause 4.12.2 with intact conductors over all the spans, is indicated in EN 50341-1 (A-dev) IT.3 Use of reinforced connections For all the spans in which the conductors cross over railways or tramways (both in their own route and on roads), trolleybus lines, terrestrial cable railways, cableways (excluding cable transporting systems, cantilever wires or simple cable systems), highways, state or provincial roads and their parts inside inhabited areas, ski-lifts and chair-lifts, nd class navigable rivers and communication lines, buildings used for habitation, the line conductors shall be fixed to supports by means of a reinforced connection (royal Decree n° 823, June 1911 and royal Decree n° 959, 11 July 1913) Moreover the utilisation of reinforced connection is not required to fix line conductors to supports in case of use of cap and pin insulators of tempered glass or ceramic material which comply with the prescriptions reported in “Guida CEI 36:1997-10 Fasc 3775 R” BS EN 50341-2-13:2017 Italy - 28/32 - 11 Hardware 11.6 Mechanical requirements (ncpt) IT.1 EN 50341-2-13:2017 Partial factor for ultimate state limits The fittings for overhead lines shall be designed, constructed and installed complying with the prescriptions for operation, maintenance and environment impact as established by design parameters of overhead lines and with reference to EN 50341-1 and to this standard For ultimate state limits, partial factor γ M = 1.6 shall be applied 12 (ncpt) Quality assurance, checks and taking-over IT.1 Provisions for quality assurance check and taking over During design, manufacturing and construction, the provisions for quality assurance check and taking over shall be according to subclause 12 of EN 50341-1 (ncpt) IT.2 Testing Testing of overhead power lines has to be performed in the phase of construction, during installing of structural elements that will be no longer inspectable, controllable and testable as a result of the continuing of the construction For items that can be verified, it can also be executed upon completion of the work The responsible for testing shall be appointed by the customer and must be a certified engineer under current legislation Testing includes: a) verification that the work has been executed in accordance with the approved design and in compliance with this standard; b) the inspection of the work during the various stages of implementation with particular regard to the most important structural parts The inspection of the work will be performed by comparing the resulting object with the project; The responsible for testing shall check that all design requirements and quality control during construction have been performed When construction is done under a quality assurance process, the responsible for testing must be informed about the contents of the quality control documents and the register of non-compliance c) examination of certificates related to tests on concrete; d) examination of the certificates of acceptance tests referred to controls performed at factory on the line components (fittings, insulators, bare conductors, earth-wires, cables, supports, etc…); e) control of reports installation; and results of any checking performed during The responsible for testing, as part of its responsibilities, shall: f) examine the investigations carried out during design and construction, as specified in this standard; g) examine the report of completion of work BS EN 50341-2-13:2017 Italy - 29/32 - EN 50341-2-13:2017 Finally, the responsible for testing may require inspections and tests, including non-destructive methods, aimed at verifying the compliance of the work to the approved design and this technical standard The customer may make available the results of load tests carried out on supports of a similar design as those under test: in such case the execution of load tests is not required For lines up to 45 kV and / or for higher voltage lines, in the event of minor changes, the testing report may be replaced by the report of completion of work BS EN 50341-2-13:2017 Italy - 30/32 - EN 50341-2-13:2017 Annex J (normative) Tower supports J.4 (ncpt) Buckling resistance of angle in compression (see 7.3.6.4) IT.1 Determination of the curve σ-λ The determination of curve σ-λ is performed on the base of the criteria indicated in clause J.4, where: • σ = N b,Rd /A • λ = λ eff The imperfection factor α is set at 0,34 Alternatively, for S355, the following curves σ-λ can be considered: • for main legs, currents and main roads, the curve identified as SIGMA1(σ ), • for primary, secondary and redundant bracing members (supports) with slenderness, calculated for the minimum value of radius of gyration of section i vv , the curve identified as SIGMA2 (σ ), • for primary, secondary and redundant bracing members (supports) with slenderness, calculated for the value of radius of gyration of section i yy or i zz ,(“mean radii of gyration”) the curve identified as SIGMA3 (σ ) In case of steel with higher grade than S355 (defined in accordance with EN 1993) supports shall be subjected to load tests The values of the above mentioned as SIGMA1(σ1), SIGMA2 (σ2) and SIGMA3 (σ3 ) curves as function of slenderness (λ), for steel S355 in daN/mm , are reported in Table J.4/IT.1 BS EN 50341-2-13:2017 Italy - 31/32 - EN 50341-2-13:2017 Table J.4/IT.1 − Tabulated values for curves SIGMA1(σ1), SIGMA2 (σ2 ) (related to a “minimum” radius of gyration), SIGMA3 (σ3 ) (related to “mean radii of gyration”) as function of slenderness, for steel S355 in daN/mm λ σ1 σ2 σ3 λ σ1 σ2 σ3 λ σ1 σ2 σ3 λ σ1 σ2 σ3 λ σ1 σ2 σ3 322,7 284,1 249,5 51 258,8 206,3 164,4 101 134,4 128,9 102,6 151 69,1 69,1 62,0 201 41,0 41,0 40,1 322,7 282,9 247,9 52 256,4 204,6 162,9 102 132,5 127,7 101,7 152 68,2 68,2 61,4 202 40,6 40,6 39,8 322,7 281,7 246,3 53 254,1 202,8 161,3 103 130,5 126,5 100,8 153 67,5 67,5 60,8 203 40,3 40,3 39,5 322,7 280,4 244,7 54 251,7 201,1 159,8 104 128,6 125,3 99,9 154 66,7 66,7 60,2 204 39,9 39,9 39,2 322,7 279,1 243,1 55 249,3 199,3 158,2 105 126,8 124,1 99,0 155 65,9 65,9 59,7 205 39,5 39,5 38,9 322,7 277,8 241,5 56 246,8 197,5 156,7 106 124,9 122,9 98,2 156 65,2 65,2 59,1 206 39,2 39,2 38,6 322,7 276,5 239,8 57 244,3 195,8 155,2 107 123,1 121,8 97,3 157 64,4 64,4 58,5 207 38,8 38,8 38,3 322,7 275,2 238,1 58 241,8 194,0 153,7 108 121,4 120,7 96,5 158 63,7 63,7 58,0 208 38,5 38,5 38,0 322,7 273,9 236,5 59 239,3 192,3 152,2 109 119,6 119,5 95,6 159 63,0 63,0 57,5 209 38,2 38,2 37,7 10 322,7 272,5 234,8 60 236,7 190,5 150,8 110 117,9 117,9 94,8 160 62,3 62,3 56,9 210 37,8 37,8 37,4 11 322,7 271,2 233,1 61 234,1 188,8 149,3 111 116,3 116,3 94,0 161 61,6 61,6 56,4 211 37,5 37,5 37,1 12 322,7 269,8 231,4 62 231,5 187,1 147,9 112 114,6 114,6 93,2 162 60,9 60,9 55,9 212 37,1 37,1 36,9 13 322,7 268,4 229,7 63 228,9 185,4 146,5 113 113,0 113,0 92,3 163 60,2 60,2 55,4 213 36,8 36,8 36,6 14 322,7 267,0 228,0 64 226,2 183,7 145,1 114 111,4 111,4 91,3 164 59,6 59,6 54,9 214 36,5 36,5 36,3 15 322,7 265,6 226,2 65 223,6 182,0 143,7 115 109,9 109,9 90,2 165 58,9 58,9 54,4 215 36,2 36,2 36,0 16 321,7 264,2 224,5 66 220,9 180,3 142,3 116 108,3 108,3 89,2 166 58,3 58,3 53,9 216 35,9 35,9 35,8 17 320,2 262,7 222,8 67 218,2 178,6 140,9 117 106,8 106,8 88,2 167 57,6 57,6 53,4 217 35,6 35,6 35,5 18 318,6 261,2 221,0 68 215,5 176,9 139,6 118 105,3 105,3 87,3 168 57,0 57,0 52,9 218 35,3 35,3 35,2 19 317,1 259,8 219,3 69 212,8 175,3 138,2 119 103,9 103,9 86,3 169 56,4 56,4 52,4 219 35,0 35,0 35,0 20 315,6 258,3 217,5 70 210,0 173,6 136,9 120 102,5 102,5 85,3 170 55,8 55,8 52,0 220 34,7 34,7 34,7 21 314,1 256,8 215,7 71 207,3 172,0 135,6 121 101,1 101,1 84,4 171 55,2 55,2 51,5 221 34,4 34,4 34,4 22 312,6 255,3 214,0 72 204,6 170,3 134,3 122 99,7 99,7 83,5 172 54,6 54,6 51,1 222 34,1 34,1 34,1 23 311,0 253,7 212,2 73 201,9 168,7 133,0 123 98,4 98,4 82,6 173 54,1 54,1 50,6 223 33,8 33,8 33,8 24 309,5 252,2 210,4 74 199,2 167,1 131,8 124 97,0 97,0 81,7 174 53,5 53,5 50,2 224 33,5 33,5 33,5 25 307,9 250,6 208,7 75 196,5 165,5 130,5 125 95,8 95,8 80,8 175 52,9 52,9 49,7 225 33,2 33,2 33,2 26 306,3 249,0 206,9 76 193,8 163,9 129,3 126 94,5 94,5 79,9 176 52,4 52,4 49,3 226 33,0 33,0 33,0 27 304,7 247,4 205,1 77 191,1 162,4 128,1 127 93,2 93,2 79,1 177 51,9 51,9 48,9 227 32,7 32,7 32,7 28 303,1 245,8 203,4 78 188,4 160,8 126,9 128 92,0 92,0 78,2 178 51,3 51,3 48,5 228 32,4 32,4 32,4 29 301,5 244,2 201,6 79 185,8 159,3 125,7 129 90,8 90,8 77,4 179 50,8 50,8 48,1 229 32,1 32,1 32,1 30 299,8 242,6 199,8 80 183,2 157,7 124,5 130 89,6 89,6 76,6 180 50,3 50,3 47,6 230 31,9 31,9 31,9 31 298,1 240,9 198,1 81 180,5 156,2 123,3 131 88,5 88,5 75,8 181 49,8 49,8 47,2 231 31,6 31,6 31,6 32 296,4 239,3 196,3 82 178,0 154,7 122,2 132 87,3 87,3 75,0 182 49,3 49,3 46,8 232 31,4 31,4 31,4 33 294,7 237,6 194,6 83 175,4 153,2 121,0 133 86,2 86,2 74,2 183 48,8 48,8 46,5 233 31,1 31,1 31,1 34 293,0 235,9 192,8 84 172,9 151,8 119,9 134 85,1 85,1 73,5 184 48,3 48,3 46,1 234 30,9 30,9 30,9 35 291,2 234,3 191,1 85 170,3 150,3 118,8 135 84,0 84,0 72,7 185 47,8 47,8 45,7 235 30,6 30,6 30,6 36 289,4 232,6 189,4 86 167,9 148,9 117,7 136 82,9 82,9 72,0 186 47,3 47,3 45,3 236 30,4 30,4 30,4 37 287,6 230,8 187,6 87 165,4 147,4 116,6 137 81,9 81,9 71,2 187 46,9 46,9 44,9 237 30,1 30,1 30,1 38 285,7 229,1 185,9 88 163,0 146,0 115,5 138 80,9 80,9 70,5 188 46,4 46,4 44,6 238 29,9 29,9 29,9 39 283,9 227,4 184,2 89 160,6 144,6 114,4 139 79,9 79,9 69,8 189 46,0 46,0 44,2 239 29,7 29,7 29,7 40 282,0 225,7 182,5 90 158,2 143,2 113,4 140 78,9 78,9 69,1 190 45,5 45,5 43,8 240 29,4 29,4 29,4 41 280,0 223,9 180,8 91 155,9 141,9 112,4 141 77,9 77,9 68,4 191 45,1 45,1 43,5 241 29,2 29,2 29,2 42 278,0 222,2 179,1 92 153,6 140,5 111,3 142 76,9 76,9 67,7 192 44,7 44,7 43,1 242 29,0 29,0 29,0 43 276,0 220,5 177,4 93 151,3 139,2 110,3 143 76,0 76,0 67,0 193 44,2 44,2 42,8 243 28,7 28,7 28,7 44 274,0 218,7 175,8 94 149,1 137,8 109,3 144 75,1 75,1 66,4 194 43,8 43,8 42,4 244 28,5 28,5 28,5 45 271,9 216,9 174,1 95 146,9 136,5 108,3 145 74,2 74,2 65,7 195 43,4 43,4 42,1 245 28,3 28,3 28,3 46 269,8 215,2 172,5 96 144,7 135,2 107,3 146 73,3 73,3 65,1 196 43,0 43,0 41,7 246 28,1 28,1 28,1 47 267,7 213,4 170,8 97 142,6 133,9 106,4 147 72,4 72,4 64,4 197 42,6 42,6 41,4 247 27,9 27,9 27,9 48 265,5 211,7 169,2 98 140,5 132,6 105,4 148 71,5 71,5 63,8 198 42,2 42,2 41,1 248 27,7 27,7 27,7 49 263,3 209,9 167,6 99 138,4 131,4 104,5 149 70,7 70,7 63,2 199 41,8 41,8 40,8 249 27,5 27,5 27,5 50 261,0 208,1 166,0 100 136,4 130,1 103,5 150 69,9 69,9 62,6 200 41,4 41,4 40,4 250 27,2 27,2 27,2 BS EN 50341-2-13:2017 Italy - 32/32 - EN 50341-2-13:2017 J.5 Design resistance for bolted connections (see 7.3.8) J.5.1 General (ncpt) IT.1 Hole position for bolted connections With regard to geometric characteristics and the relative positions of the bolt holes from the edges and at the ends of the associated rods, the values of the following table apply Table J.5/IT.1 − Hole positions for bolted connections d [mm] d0 [mm] e1 (bracing) [mm] e1 (tower legs) [mm] e2 [mm] P1 [mm] 12 13,5 20 25 17 35 14 15,5 25 30 20 40 16 17,5 25 30 22 45 20 21,5 35 40 27 55 22 24 40 45 30 60 24 26 45 50 32 65 27 29 50 55 37 70 30 32 55 60 40 75 Where indicated values mean (as given in Figure J.6/IT.1): • d0 = hole diameter; • P1 = minimum space (inter-axis) between two consecutive holes, on the same row; • e1 = minimum space (inter-axis) between the nearest bolt to road end; • e2 = minimum distance between the nearest bolt to road end Figure J.6/IT.1 − Bolts position This page deliberately 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