EN 50341-2-4:2016

SLOVENSKI STANDARD
01-september-2016
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Overhead electrical lines exceeding AC 1 kV - Part 2-4: National Normative Aspects
(NNA) for Germany (based on EN 50341-1:2012)
Freileitungen über AC 1 kV - Teil 2-4: Nationale Normative Festlegungen (NNA) für
Deutschland (basierend auf EN 50341-1:2012)
Ta slovenski standard je istoveten z: EN 50341-2-4:2016
ICS:
29.240.20 Daljnovodi Power transmission and
distribution lines
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50341-2-4

NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2016
ICS 29.240.20
English Version
Overhead electrical lines exceeding AC 1 kV - Part 2-4: National
Normative Aspects (NNA) for Germany (based on EN 50341-
1:2012)
This European Standard was approved by CENELEC on 2015-12-01. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
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, 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
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50341-2-4:2016 E
Contents
Page
European foreword . 8
1 Scope . 9
1.1 General . 9
1.2 Field of application . 9
2 Normative references, definitions and symbols . 9
2.1 Normative references . 9
2.2 Definitions . 14
2.3 Symbols . 19
3 Basis of design . 23
3.2 Requirements of overhead lines . 23
3.2.1 Basic requirements . 23
3.2.2 Reliability requirements . 23
3.2.5 Strength coordination . 23
3.2.6 Additional considerations . 23
3.4 Actions . 23
3.4.3 Classification of actions by their nature and/or the structural response . 23
3.6 Design values . 24
3.6.3 Design value of a material property . 24
3.6.4 Combination value of a variable action . 24
4 Actions on lines . 24
4.1 Introduction . 24
4.3 Wind loads . 24
4.4 Wind forces on overhead line components . 27
4.4.1 Wind forces on conductors . 27
4.4.2 Wind forces on insulator sets . 29
4.4.3 Wind forces on lattice towers . 30
4.4.4 Wind forces on poles . 32
4.5 Ice loads . 32
4.5.2 Ice forces on conductors . 32
4.6 Combined wind and ice loads . 34
4.6.4 Equivalent diameter D of ice-covered conductor . 34
4.6.6 Combination of wind velocities and ice loads . 34
4.8 Security loads . 34
4.8.1 General. 34
4.9 Safety loads . 34
4.9.1 Construction and maintenance loads . 34

Germany – 3/90 – EN 50341-2-4:2016

Page
4.9.2 Loads related to the weight of lines men. 35
4.10 Forces due to short-circuit currents . 35
4.11 Other special forces . 35
4.12 Load cases . 35
4.12.1 General . 35
4.12.2 Standard load cases. 36
4.13 Partial factors for actions . 39
5 Electrical requirements . 40
5.2 Currents . 40
5.2.1 Normal current . 40
5.4 Classification of voltages and overvoltages . 40
5.4.2 Representative power frequency voltages . 40
5.5 Minimum air clearance distances to avoid flashover. 40
5.5.3 Empirical method based on European experience . 40
5.6 Load cases for calculation of clearances . 40
5.6.3 Wind loads for determination of electric clearances . 40
5.6.4 Ice loads for the determination of electric clearances . 41
5.6.5 Combined wind and ice loads . 41
5.8 Internal clearances within the span and at the top of support . 41
5.9 External clearances . 42
5.9.1 General . 42
5.9.2 External clearances to ground in areas remote from buildings, roads etc. . 45
5.9.3 External clearances to residential and other buildings . 45
5.9.4 External clearances to crossing traffic routes . 47
5.9.5 External clearances to adjacent traffic routes . 47
5.9.6 External clearances to other power lines or overhead telecommunication lines . 48
5.11 Electric and magnetic fields . 48
5.11.1 Electric and magnetic fields under a line. 48
5.11.2 Electric and magnetic field Induction . 48
5.11.3 Interference with telecommunication circuits . 49
6 Earthing systems . 49
6.1 Introduction . 49
6.1.2 Requirements for dimensioning of earthing systems . 49
6.1.3 Earthing measures against lightning effects . 51
6.3 Dimensioning with regard to thermal strength . 51
6.3.2 Current rating calculation . 51
6.4 Dimensioning with regard to human safety . 52
6.4.2 Touch voltage limits at different locations . 52

Page
6.4.3 Basic design of earthing systems with regard to permissible touch voltage . 52
6.4.4 Measures in systems with isolated neutral or resonant earthing . 53
6.5 Site inspection and documentation of earthing systems . 53
7 Supports . 53
7.1 Initial design considerations . 53
7.2 Materials . 54
7.2.1 Steel materials, bolts, nuts and washers, welding consumables . 54
7.2.6 Wood . 54
7.2.8 Other materials . 54
7.3 Lattice steel towers. 54
7.3.1 General. 54
7.3.5 Structural analysis . 55
7.3.6 Ultimate limit states . 55
7.3.8 Resistance of connections . 55
7.4 Steel poles . 57
7.4.1 General. 57
7.4.5 Structural analysis . 57
7.4.6 Ultimate limit states . 57
7.4.7 Serviceability limit states . 58
7.4.8 Resistance of connections . 58
7.5 Wood poles . 58
7.5.2 Basis of design . 58
7.5.5 Ultimate limit states . 59
7.5.6 Serviceability limit states . 59
7.5.7 Resistance of connections . 59
7.6 Concrete poles . 59
7.6.2 Basis of Design . 59
7.6.2.1 General rules . 59
7.6.4 Ultimate limit states . 59
7.6.5 Serviceability limit states . 60
7.7 Guyed structures . 60
7.7.1 General. 60
7.7.3 Materials . 60
7.8 Other structures . 60
7.9 Corrosion protections and finishes . 61
7.9.1 General. 61
7.9.2 Galvanising . 61
7.9.4 Paint over galvanising in plant (Duplex system) . 61
7.9.7 Protection of wood poles . 61
7.10 Maintenance facilities . 61

Germany – 5/90 – EN 50341-2-4:2016

Page
7.10.1 Climbing . 61
7.10.2 Maintainability . 63
7.10.3 Safety requirements . 63
8 Foundations . 63
8.2 Basis of geotechnical design . 63
8.2.2 Geotechnical design by calculation . 63
8.2.3 Design by prescriptive measures . 64
8.2.4 Load tests and tests on experimental models . 64
8.6 Interaction between support foundations and soil . 64
9 Conductors and earth wires . 65
9.2 Aluminium based conductors . 65
9.2.1 Characteristics and dimensions . 65
9.2.3 Conductor service temperatures and grease characteristics . 66
9.3 Steel based conductors . 66
9.3.1 Characteristics and dimensions . 66
9.3.3 Conductor service temperatures and grease characteristics . 67
9.3.4 Mechanical requirements . 67
9.4 Copper based conductors . 68
9.6 General requirements . 69
9.6.2 Partial factor for conductors . 69
9.6.3 Minimum cross sections . 70
9.6.4 Sag-tension calculations . 70
10 Insulators . 71
10.1 Introduction . 71
10.7 Mechanical requirements . 71
10.9 Material selection and specification . 73
10.10 Characteristics and dimensions of insulators . 73
11 Hardware . 73
11.1 Introduction . 73
11.2 Electrical requirements . 73
11.2.1 Requirements applicable to all fittings. 73
11.2.2 Requirements applicable to current carrying fittings . 74
11.6 Mechanical requirements . 74
12 Quality assurance, checks and taking-over . 76
Annex G (normative) Calculation methods for earthing systems . 77
G.4 Touch voltage and body current . 77
G.4.1 Equivalence between touch voltage and body current . 77
Annex J (normative) Angles in lattice steel towers . 78

Page
J.2 General . 78
J.3 Tensile resistance of angles connected through one leg . 78
J.4 Buckling resistance of angles in compression . 79
J.4.1 Flexural buckling resistance . 79
J.4.3 Slenderness of members . 79
J.4.3.2 Leg members and chords . 79
J.4.3.3 Primary bracing pattern . 80
J.4.3.4 Compound members . 84
J.4.4 Secondary (or redundant) bracing members . 84
J.5 Design resistance of bolted connections . 85
J.5.1 General . 85
Annex M (informative) Geotechnical and structural design of foundations . 86
M.3 Sample semi-empirical models for resistance estimation . 86
M.3.1 Geotechnical design by calculation . 86
M.3.1.1 General. 86
M.3.1.2 Monoblock foundations . 86
M.3.1.3 Slab foundations . 86
M.3.1.4 Grillage-typ slab foundations . 86
M.3.1.5 Single-pile foundations . 86
M.3.1.6 Separate stepped block foundations, pad and chimney foundations . 87
M.3.1.9 Pile foundations . 87
M.3.2 Structural design of concrete foundations . 87
Annex AA (informative) Assumptions for ice loads . 88
Literature. 90

Figures
Figure 4/DE.1 – Map of wind zones for the Federal Republic of Germany according to
DIN EN 1991-1-4/NA:2010-12 . 26
Figure 4/DE.2 – Wind action on conductors and resulting wind force in any wind direction . 28
Figure 4/DE.3 – Wind action on towers . 32
Figure 5/DE.1 – Description of the wake behind a wind energy converter, where tan β = 0,1 has to
be assumed. . 47
Figure 6/DE.1 – Separated earthing systems with connection via an overhead line . 50
Figure 6/DE.2 – Separated earthing systems via cable connection . 50
Figure J.4/DE.1 – Slenderness ratio λ of leg members . 80
Figure J.4/DE.2 – Usual diagonal bracings . 81
Figure J.4/DE.3 – Application of secondary and spatial bracing systems . 81
Figure AA.1 – Ice load zone map for the German Federal Republic (informative) . 89

Tables
Germany – 7/90 – EN 50341-2-4:2016

Page
Table 3/DE.1 – Material partial factors for towers and poles. 24
Table 4/DE.1 – Aerodynamic drag factors . 29
C
x
Table 5/DE.1 – Nominal voltages in the system and related maximum operational voltages and
maximum voltage for equipment . 40
Table 5/DE.2 – Nominal voltages in the grid and voltage-related minimum clearances . 46
Table 6/DE.1 – Cumulative frequency of lightning currents on towers of lines with shield wires . 51
Table 6/DE.2 – Decisive currents for rating of the earthing system . 52
Table 7/DE.1 – Dimensions of connections and edge distances of jointing components . 56
Table 9/DE.1 – Mechanical characteristics, permissible everyday stress for standard conductors
according to DIN EN 50182 . 65
Table 9/DE.2 – Permissible conductor temperature in case of short-circuit load for conductors using
aluminium as conducting material . 66
Table 9/DE.3 – Permissible conductor temperature in case of short-circuit load for conductor made
of steel . 67
Table 9/DE.4 – Mechanical characteristics, permissible everyday stresses for standardized
conductors according to DIN VDE 0212-399 (VDE 0212-399) and DIN EN 50182 . 67
Table 9/DE.5 – Mechanical characteristics, permissible everyday stresses for conductors according
to DIN 48201-1 and DIN 48201-2. 68
Table 9/DE.6 – Permissible conductor temperature in case of short-circuit loading for conductors
made of copper. 69
Table 9/DE.7 – Minimum cross sections . 70
Table 10/DE.1 – Material partial factors for insulators (related to the mechanical failing load) . 72

European foreword
The following 6 statements are required from CLC/TC 11 for all NNAs; statement 7 was added by the
German National Committee (NC).
1 The German National Committee is identified by the following address:
Deutsche Elektrotechnische Kommission im DIN und VDE (DKE)
Stresemannallee 15 (VDE Haus)
D-60596 Frankfurt/Main
Germany
phone ++49 69 6308-(0) 224
Fax ++49 69 6312-925
Name of the relevant technical body: Komitee 421 (K 421) “Freileitungen” (Overhead power lines)
2 The German NC and its technical body K 421 “Overhead power lines” of Deutsche
Elektrotechnische Kommission im DIN und VDE (DKE) prepared this Part 2-4 of EN 50341, listing
the German National Normative Aspects (NNA) under its sole responsibility, and duly passed it
through the CENELEC and CLC/TC 11 procedures.
NOTE The German NC also takes sole responsibility for the technically correct co-ordination of this
EN 50431-2-4 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 made in the framework of the
general responsibility of a standards committee under the national laws/regulations.
3 This EN 50341-2-4 is normative in Germany and informative in other countries.
4 This Part 2-4 has to be read in conjunction with EN 50341-1, hereafter referred to as Part 1. All
clause numbers used in this NNA correspond to those of Part 1. Specific subclauses, which are
prefixed “DE”, are to be read as amendments to the relevant text in Part 1. Any necessary
clarification regarding the application of this combined NNA in conjunction with Part 1 shall be
referred to the German 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 1 applies.
5 In case of “boxed values” defined in Part 1, amended values, (if any) which are defined in Part 2-4
shall be taken into account in Germany.
However, any “boxed value”, whether in Part 1 or Part 2-4, shall not be amended in the direction of
greater risk in a Project Specification.
6 The National German standards/regulations related to overhead electrical lines exceeding 1 kV AC
are listed in 2.1 of this Part 2-4.
NOTE All national standards referred to in this Part 2-4 will be replaced by the relevant European Standards
as soon as they become available and are declared by the German NC to be applicable and thus reported to
the secretary of CLC/TC 11.
7 5.11.1/DE.1 is an “A-dev”
4.3/DE.1, 4.4.1/DE.1, 4.5.2/DE.1, 5.2.1/DE.1, 5.6.3.2/DE.1, 5.6.3.3/DE.1, 5.6.4/DE.1, 5.6.5/DE.1,
and 9.6.4/DE.2 are “snc”.
All other subclauses DE.X are “ncpt”.

Germany – 9/90 – EN 50341-2-4:2016

1 Scope
1.1 General
1.1 DE.1 General
(ncpt) (Supplement to DIN EN 50341-1 (VDE 0210-1):2013-11, clause 1.1)
This EN applies for planning and design of overhead lines with nominal voltages above
AC 1 kV.
This EN needs not to be adopted for existing installations. Installations in the planning and
construction stage may be completed adopting the standard edition valid at the beginning of
planning.
1.2 Field of application
1.2 DE.1 Application for conductors with components for telecommunication
(ncpt) (Supplement to DIN EN 50341-1 (VDE 0210-1):2013-11, 1.2)
In Germany this EN is applicable for all types of conductors (according to the information in
clause 1.2) which contain components for telecommunication.
1.2 DE.2 Application for installation of telecommunication equipment on supports
(ncpt) (Supplement to DIN EN 50341-1 (VDE 0210-1):2013-11, 1.2)
In Germany this EN is applicable for the installation of telecommunication equipment on
supports. Reference is made to 4.11.1/DE.1 “Extension of utilization”.

2 Normative references, definitions and symbols
2.1 Normative references
The following documents which are quoted partly or as a whole in this document are
necessary for the application of this document. In case of dated reference only the referred
edition is applicable. In case of non-dated references the last edition of the referred
document (including all modifications) is applicable.
1)
DASt 022 , Guideline of DASt for hot-dip-zink-coating of prefabricated loadbearing steel
components
DASt-Richtlinie – Feuerverzinken von tragenden Stahlbauteilen
DIN 1054:2010-12, Subsoil – Verification of the safety of earthworks and foundations –

Supplementary rules to DIN EN 1997-1:2009-09 + NA:2010-12
Baugrund – Sicherheitsnachweise im Erd- und Grundbau – Ergänzende Regelungen zu
DIN EN 1997-1:2009-09 + NA:2010-12
DIN 4102-7:1998-07, Fire behaviour of building materials and building components – Part 7:

Roofing – Definitions, requirements and testing
Brandverhalten von Baustoffen und Bauteilen – Teil 7: Bedachungen – Begriffe,
Anforderungen und Prüfungen
1)
Source: Stahlbau Verlags- und Service GmbH

DIN 48006-1, Insulators for overhead lines – Part 1: Long-rod insulators LP with socket caps
Isolatoren für Starkstrom-Freileitungen – Langstabisolatoren mit Pfannenkappen
DIN 48006-2, Insulators for overhead lines – Part 2: Long-rod insulators LG with clevis caps

Isolatoren für Starkstrom-Freileitungen – Langstabisolatoren mit Gabelkappen
DIN 48006-3, Insulators for overhead lines – Part 3: solid-core (VK) insulators

Isolatoren für Starkstrom-Freileitungen – Vollkernisolatoren VK
DIN 48200-1, Copper wires for stranded conductors
Drähte für Leitungsseile – Drähte aus Kupfer
DIN 48200-2, Bronze wires for stranded conductors

Drähte für Leitungsseile – Drähte aus Kupferknetlegierung
DIN 48201-1, Copper stranded conductors

Leitungsseile – Seile aus Kupfer
DIN 48201-2, Bronze stranded conductors
Leitungsseile – Seile aus Kupfer-Knetlegierungen (Bz)
DIN 48203-1, Copper wires and copper stranded conductors; technical delivery conditions

Drähte und Seile für Leitungen aus Kupfer – Technische Lieferbedingungen
DIN 48203-2, Wrought copper alloy (Bz) wires and conductors; technical delivery conditions

Drähte und Seile für Leitungen aus Kupferknetlegierungen (Bz) – Technische
Lieferbedingungen
DIN VDE 0212-399 (VDE 0212-399), Conductors for Overhead lines – Conductors of
concentric stranded round galvanized steel wires
Leiter für Freileitungen – Leiter aus konzentrisch verseilten runden verzinkten Stahldrähten
DIN VDE V 0212-490 (VDE V 0212-490):2014-12, Fittings for overhead lines – Part 490:

Components for the protection of birds – Requirements and tests
Armaturen für Freileitungen – Teil 490: Bauteile für den Vogelschutz – Anforderungen und
Prüfungen
DIN EN 10025-1:2005-02, Hot rolled products of structural steels – Part 1: General technical

delivery conditions
Warmgewalzte Erzeugnisse aus Baustählen – Teil 1: Allgemeine technische
Lieferbedingungen
DIN EN 10025-2:2005-04, Hot rolled products of structural steels – Part 2: Technical delivery
conditions for non-alloy structural steels
Warmgewalzte Erzeugnisse aus Baustählen – Teil 2: Technische Lieferbedingungen für
unlegierte Baustähle
DIN EN 1090-1, Execution of steel structures and aluminium structures – Part 1:

Requirements for conformity assessment of structural components
Ausführung von Stahltragwerken und Aluminiumtragwerken – Teil 1: Konformi-
tätsnachweisverfahren für tragende Bauteile
DIN EN 1090-2, Execution of steel structures and aluminium structures – Part 2: Technical

requirements for steel structures
Ausführung von Stahltragwerken und Aluminiumtragwerken – Teil 2: Technische Regeln für
die Ausführung von Stahltragwerken
DIN EN 12385-4:2008-06 + amendment 1:2009-01, Steel wire ropes – Safety – Part 4:
Stranded ropes for general lifting applications; German version EN 12385-4:2002+A1:2008
Drahtseile aus Stahldraht – Sicherheit – Teil 4: Litzenseile für allgemeine Hebezwecke;
Deutsche Fassung EN 12385-4:2002 + A1:2008

Germany – 11/90 – EN 50341-2-4:2016

DIN EN 12843:2004-11, Precast concrete products – Masts and poles; German version
EN 12843:2004
Betonfertigteile – Maste; Deutsche Fassung EN 12843:2004
DIN EN 1991-1-4:2010-12, Eurocode 1: Actions on structures – Part 1-4: General actions –
Wind actions; German version EN 1991-1-4:2005 + A1:2010 + AC:2010
Eurocode 1: Einwirkungen auf Tragwerke – Teil 1-4: Allgemeine Einwirkungen – Windlasten;
Deutsche Fassung EN 1991-1-4:2005 + A1:2010 + AC:2010
DIN EN 1991-1-4/NA:2010-12, National Annex - Nationally determined parameters –
Eurocode 1: Actions on structures – Part 1-4: General actions - Wind actions
Nationaler Anhang – National festgelegte Parameter – Eurocode 1: Einwirkungen auf
Tragwerke – Teil 1-4: Allgemeine Einwirkungen – Windlasten
DIN EN 1992-1-1:2011-01, Eurocode 2: Design of concrete structures – Part 1-1: General
rules and rules for buildings; German version EN 1992-1-1:2004 + AC:2010
Eurocode 2: Bemessung und Konstruktion von Stahlbeton- und Spannbetontragwerken –
Teil 1-1: Allgemeine Bemessungsregeln und Regeln für den Hochbau; Deutsche Fassung
EN 1992-1-1:2004 + AC:2010
DIN EN 1992-1-1/NA:2013-04, National Annex – Nationally determined parameters –
Eurocode 2: Design of concrete structures – Part 1-1: General rules and rules for buildings
Nationaler Anhang – National festgelegte Parameter – Eurocode 2: Bemessung und
Konstruktion von Stahlbeton- und Spannbetontragwerken – Teil 1-1: Allgemeine
Bemessungsregeln und Regeln für den Hochbau
DIN EN 1997-1:2009-09, Eurocode 7: Geotechnical design – Part 1: General rules; German
version EN 1997-1:2004 + AC:2009
Eurocode 7: Entwurf, Berechnung und Bemessung in der Geotechnik – Teil 1: Allgemeine
Regeln; Deutsche Fassung EN 1997-1:2004 + AC:2009
DIN EN 1997-1/NA:2010-12, National Annex – Nationally determined parameters –
Eurocode 7: Geotechnical design – Part 1: General rules
Nationaler Anhang – National festgelegte Parameter – Eurocode 7: Entwurf, Berechnung
und Bemessung in der Geotechnik – Teil 1: Allgemeine Regeln
DIN EN 50182, Conductors for overhead lines – Round wire concentric lay stranded
conductors
Leiter für Freileitungen – Leiter aus konzentrisch verseilten runden Drähten
DIN EN 50183, Conductors for overhead lines – Aluminium-magnesium-silicon alloy wire for

overhead line conductors
Leiter für Freileitungen – Drähte aus Aluminium-Magnesium-Silizium-Legierung
DIN EN 50189, Conductors for overhead lines – Zinc coated steel
...