EN 50341-2-12:2018

SLOVENSKI STANDARD
01-april-2019
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Overhead electrical lines exceeding AC 1 kV - Part 2-12: National Normative Aspects
(NNA) for ICELAND (based on EN 50341-1:2012)
Ta slovenski standard je istoveten z: EN 50341-2-12:2018
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 50341-2-12

NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2018
ICS 29.240.20
English Version
Overhead electrical lines exceeding AC 1 kV - Part 2-12:
National Normative Aspects (NNA) for ICELAND (based on EN
50341-1:2012)
This European Standard was approved by CENELEC on 2018-11-26.
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: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50341-2-12:2018 E
Contents
Foreword . 4
1 Scope . 5
1.1 General . 5
2 Normative references, definitions and symbols . 5
2.1 Normative references . 5
2.1 IS.1 National normative laws and government regulations: . 5
3 Basis of design . 5
3.2 Requirements of overhead lines . 5
3.2.2 Reliability requirements . 5
3.2.5 Strength coordination. 6
4 Actions on lines . 6
4.3 Wind loads . 6
4.3.1 Field of application and basic wind velocity . 6
4.3.2 Mean wind velocity . 6
4.3.3 Mean wind pressure . 6
4.4 Wind forces on overhead line components . 6
4.4.1 Wind forces on conductors . 6
4.4.3 Wind forces on lattice towers . 7
4.5 Ice loads . 8
4.5.2 Ice forces on conductors . 8
4.6 Combined wind and ice loads . 9
4.6.1 Combined probabilities . 9
4.6.2 Drag factors and ice densities . 9
4.7 Temperature effects . 9
4.8 Security loads . 9
4.8.1 General . 9
4.8.4 Mechanical conditions of application . 10
4.9 Safety loads . 10
4.9.1 Construction and maintenance loads. 10
4.12 Load cases . 11
4.12.2 Standard load cases . 11
4.13 Partial factors for actions . 12
5 Electrical requirements . 13
5.5 Minimum air clearance distances to avoid flashover . 13
5.6 Load cases for calculation of clearances . 13
5.6.4 Ice loads for the determination of electric clearances . 13
5.8 Internal clearances within the span and at the top of support . 13
5.9 External clearances . 16
5.9.1 General . 16

Iceland -3/25 - EN 50341-2-12:2018
5.9.2 External clearances to ground in areas remote from buildings, roads, etc. . 16
5.9.3 External clearances to residential and other buildings . 16
5.9.4 External clearances to crossing traffic routes . 17
5.9.5 External clearances to adjacant traffic routes . 17
5.9.6 External clearances to other power lines and overhead telecommunication lines . 17
5.9.7 External clearances to recreational areas (playgrounds, sports areas, etc.) . 17
5.10.2 Audible noise . 18
6 Earthing systems . 18
7 Supports . 18
7.2 Materials . 18
7.3 Lattice steel towers . 18
7.3.3 Materials . 18
7.3.6 Ultimate limit states. 19
7.3.8 Resistance of connections . 19
7.5 Wood poles . 19
7.5.5 Ultimate limit states. 19
7.7 Guyed structures . 20
7.7.4 Ultimate limit states. 20
7.7.6 Design details for guys . 20
7.9 Corrosion protection and finishes . 21
7.9.2 Galvanising . 21
8 Foundations . 21
8.2 Basis of geotechnical design . 21
8.2.2 Geotechnical design by calculation . 21
8.3 Soil investigation and geotechnical data . 23
9 Conductors and earth-wires . 24
9.1 Introduction . 24
9.6 General requirements . 25
9.6.2 Partial factor for conductors . 25
10 Insulators . 25
10.7 Mechanical requirements . 25
11 Hardware . 25
11.6 Mechanical requirements . 25
12 Quality assurance, checks and taking-over . 25
Annex J Lattice steel towers . 25
J.5 Design resistance of bolted connections . 25
J.5.1 General . 25

European Foreword
1 The Icelandic National Committee (NC) is identified by the following address:
Rafstaðlaráð
Staðlaráð Íslands
Þórunnartúni 2
105 Reykjavík
Iceland
Tel. +354 520 7150
Fax +354 520 7171
Web http://www.stadlar.is
2 The Icelandic NC has prepared this Part 2-12 of EN 50341-1:2012 listing the Icelandic National
Normative Aspects (NNA), under its sole responsibility, and duly passed it through the CENELEC
and CLC/TC 11 procedures.
Note 1: The Icelandic NC also takes sole responsibility for the technically correct co-ordination of this EN
50341-2-12 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 50341-2-12 is normative in Iceland and informative for other countries.
4 This Part 2-12 has to be read in conjunction with EN 50341-1, hereinafter referred to as Part 1.
All clause numbers used in this Part 2-12 correspond to those of Part 1. Specific subclauses,
which are prefixed “IS”, are to be read as amendments to the relevant text in Part 1. Any
necessary clarification regarding the application of Part 2-12 in conjunction with Part 1 shall be
referred to the Icelandic NC who will, in co-operation with CLC/TC 11 clarify the requirements.
When no reference is made in Part 2-12 to a specific subclause, then Part 1 applies.
5 In the case of “boxed values” defined in Part 1, amended values (if any) which are defined in Part
2-12 shall be taken into account in Iceland.
However, any boxed value, whether in Part 1 or Part 2-12, shall not be amended in the direction
of greater risk in a Project Specification.
6 The national Icelandic standards/regulations related to overhead electrical lines exceeding 1 kV
(AC) are listed in subclause 2.1/IS.1.
NOTE  All national standards referred to in this Part 2-12 will be replaced by the relevant European Standards
as soon as they become availab
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