EN 50341-2-18:2016

SLOVENSKI STANDARD
01-februar-2018
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Overhead electrical lines exceeding AC 1 kV - Part 2-18: National Normative Aspects
(NNA) for Sweden (based on EN 50341-1:2012)
Lignes électriques aériennes dépassant 1 kV en courant alternatif - Partie 2-18 : Aspects
Normatifs Nationaux (NNA) pour la Suède (sur la base de l'EN 50341-1:2012)
Ta slovenski standard je istoveten z: EN 50341-2-18:2016
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 50341-2-18

NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2016
ICS 29.240.20
English Version
Overhead electrical lines exceeding AC 1 kV - Part 2-18:
National Normative Aspects (NNA) for Sweden (based on EN
50341-1:2012)
Lignes électriques aériennes dépassant 1 kV en courant
alternatif - Partie 2-18 : Aspects Normatifs Nationaux (NNA)
pour la Suède (sur la base de l'EN 50341-1:2012)
This European Standard was approved by CENELEC on 2016-11-01. 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 50341-2-18:2016 E
Sweden 2/85 EN 50341-2-18:2016
Foreword . 7
1 Scope . 8
2 Normative references, definitions and symbols . 8
2.1 Normative references . 8
2.2 Definitions . 11
2.3 Symbols . 11
3 Basis of design . 12
3.2 Requirements of overhead lines . 12
3.2.2 Reliability requirements . 12
3.6 Design values . 13
3.6.2 Design values of an action . 13
3.7 Partial factor method and design formula . 13
3.7.3.2 Design situations related to permanent and variable actions . 13
3.7.3.3 Design situations related to permanent, variable and accidental actions 14
4 Actions on lines . 14
4.1 Introduction . 14
4.3 Wind loads . 14
4.3.4 Turbulence intensity and peak wind pressure . 14
4.4 Wind forces on overhead line components . 14
4.4.1 Wind forces on conductors . 14
4.4.1.1 General . 14
4.4.1.2 Structural factor . 15
4.4.1.3 Drag factor . 15
4.4.2 Wind forces on insulator sets . 15
4.4.3 Wind forces on lattice towers . 15
4.4.3.1 General . 15
4.4.3.2 Method 1 . 15
4.4.3.3 Method 2 . 16
4.4.4 Wind forces on poles . 16
4.5 Ice load . 16
4.5.2 Ice forces on conductors . 16
4.6 Combined wind and ice loads . 18
4.6.2 Drag factors and ice densities . 18
4.6.3 Mean wind pressure and peak wind pressure . 18
4.6.4 Equivalent diameter D of ice covered conductor . 18
4.7 Temperature effects . 18
4.8 Security loads . 19

Sweden - 3/85 - EN 50341-2-18:2016
4.9 Safety loads . 19
4.9.1 Construction and maintenance loads . 19
4.12 Load cases . 19
4.12.2 Standard load cases . 19
4.13 Partial factors for actions . 24
5 Electrical requirements . 26
5.3 Insulation co-ordination . 26
5.4 Classification of voltages and overvoltages . 27
5.5 Minimum air clearance distances to avoid flashover . 28
5.6 Load cases for calculation of clearances . 30
5.8 Minimum internal clearances within the span and at the top of support. 34
5.9 External clearances . 39
5.9.1 General . 39
5.9.2 External clearances to ground in areas remote from buildings, roads, etc.
................................................................................................................. 40
5.9.3 External clearances to residential and other buildings . 43
5.9.4 External clearances to crossing traffic routes . 44
5.9.6 External clearances to other power lines or overhead telecommunication
lines. 46
5.9.7 External clearances to recreational areas (playgrounds, sports areas,
etc.) . 50
6 Earthing systems . 51
6.1 Introduction . 51
6.1.3 Earthing measures against lightning effects . 51
6.1.4 Transferred potentials . 51
6.2 Ratings with regard to corrosion and mechanical strength . 51
6.2.1 Earth electrodes . 51
6.2.2 Earthing and bonding conductors . 52
6.4 Dimensioning with regard to human safety . 52
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 . 54
7 Supports . 54
7.1 Initial design considerations . 54
7.2 Materials . 54
7.2.1 Steel materials, bolts, nuts and washers, welding consumables . 54
7.2.6 Wood . 54
7.3 Lattice steel towers . 55
7.3.1 General . 55

7.3.3 Materials . 55
7.3.6 Ultimate limit states . 55
7.3.6.1 General . 55
7.3.6.3 Tension, bending and compression resistance of members . 55
7.3.6.4 Buckling resistance of members in compression . 55
7.3.8 Resistance of connections . 56
7.4 Steel poles . 56
7.4.1 General . 56
7.4.6.1 Ultimate limit states, General . 56
7.4.8.1 Connections, Basis . 56
7.4.8.2 Bolts (other than holding-down bolts) . 56
7.5 Wood poles . 56
7.5.1 General . 56
7.5.3 Materials . 57
7.5.5 Ultimate limit states . 57
7.5.5.2 Calculation of internal forces and moments . 57
7.5.5.3 Resistance of wood elements . 57
7.5.5.4 Decay conditions . 58
7.5.7 Resistance of connections . 58
7.5.8 Design assisted by testing . 58
7.6 Concrete poles . 58
7.6.1 General . 58
7.6.2 Basis of design . 59
7.6.3 Materials . 59
7.6.4 Ultimate limit states . 59
7.6.5 Serviceability limit states . 59
7.6.6 Design assisted by testing . 60
7.7 Guyed structures. 60
7.7.3 Materials .
...