SIST EN 50341-2-8:2019

SLOVENSKI STANDARD
SIST EN 50341-2-8:2019
01-april-2019
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Overhead electrical lines exceeding AC 1 kV - Part 2-8: National Normative Aspects
(NNA) for France (based on EN 50341-1:2012)
Ta slovenski standard je istoveten z: EN 50341-2-8:2017
ICS:
29.240.20 Daljnovodi Power transmission and
distribution lines
SIST EN 50341-2-8:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50341-2-8:2019

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SIST EN 50341-2-8:2019


EUROPEAN STANDARD EN 50341-2-8

NORME EUROPÉENNE

EUROPÄISCHE NORM
October 2017
ICS 29.240.20

English Version
Overhead electrical lines exceeding AC 1 kV - Part 2-8: National
Normative Aspects (NNA) for France (based on EN 50341-
1:2012)

This European Standard was approved by CENELEC on 2017-08-09.
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 50341-2-8:2017 E

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Contents
European foreword . 6
0 Introduction . 7
1 Scope . 8
1.1 General . 8
1.2 Field of application . 8
2 Normative references, definitions and symbols . 9
2.1 Normative references . 9
2.2 Definitions .10
2.3 Symbols .10
3 Basis of design . 11
3.2 Requirements of overhead lines .11
3.2.2 Reliability requirements .11
3.2.5 Strength coordination .11
3.2.6 Additional considerations .11
3.3 Limit states .12
3.3.3 Serviceability limit states .12
3.7 Partial factor method and design formula .12
3.7.2 Basic design formula .12
4 Actions on lines . 13
4.1 Introduction .13
4.3 Wind loads .13
4.3.1 Field of application and basic wind velocity .13
4.4 Wind forces on overhead line components .15
4.4.1 Wind forces on conductors .15
4.4.2 Wind forces on insulator sets .15
4.4.3 Wind forces on lattice towers .15
4.4.4 Wind forces on poles.16
4.5 Ice loads .16
4.5.1 General .16
4.6 Combined wind and ice loads .19
4.6.1 Combined probabilities .19
4.7 Temperature effects .20
4.8 Security loads .20
4.8.1 General .20
4.8.2 Torsional loads .20
4.8.3 Longitudinal loads .21
4.9 Safety loads .21
4.9.1 Construction and maintenance loads.21
4.9.2 Loads related to the weight of linesmen .22
4.10 Forces due to short-circuit currents .22

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4.11 Other special forces .22
4.11.1 Avalanches, creeping snow .22
4.11.2 Earthquakes .22
4.12 Load cases .23
4.12.2 Standard load cases .23
4.13 Partial factors for actions .25
5 Electrical requirements . 27
5.2 Currents .27
5.2.2 Short-circuit current .27
5.5 Minimum air clearances to avoid flashover .27
5.5.2 Application of the theoretical method in Annex E .27
5.5.3 Empirical method based on European experience .27
5.6 Load cases for calculation of clearances .28
5.6.2 Maximum conductor temperature .28
5.6.3 Wind loads for determination of electric clearances .28
5.6.3.1 Wind load cases . 28
5.6.3.2 Nominal wind loads for determination of internal and external
clearances . 29
5.6.3.3 Extreme wind loads for determination of internal clearances . 29
5.6.4 Ice loads for determination of electric clearances .29
5.6.5 Combined wind and ice loads .30
5.8 Internal clearances within the span and at the top of the support .31
5.9 External clearances .33
5.9.1 General .33
5.9.2 External clearances to ground in areas remote from buildings, roads, etc.34
5.9.3 External clearances to residential and other buildings .37
5.9.4 External clearances to crossing traffic routes .38
5.9.5 External clearances to adjacent traffic routes .44
5.9.6 External clearances to other power lines or overhead telecommunication
lines 45
5.9.7 External clearances to recreational areas (playgrounds, sports areas, etc.).49
5.10 Corona effect .50
5.10.2 Audible noise .50
5.10.2.3 Noise limits . 50
5.10.3 Corona loss .50
5.11 Electric and magnetic fields .50
5.11.1 Electric and magnetic fields under a line .50
6 Earthing systems . 51
6.1 Introduction .51
6.1.3 Earthing measures against lightning effects .51
6.4 Design calculation with regard to human safety .51
6.4.1 Permissible values for touch voltages.51

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6.4.2 Touch voltage limits at different locations .51
6.4.3 Basic design of earthing systems with regard to permissible touch voltages .51
7 Supports . 52
7.3 Lattice steel towers .52
7.3.6 Ultimate limit states .52
7.3.6.1 General . 52
7.3.8 Resistance of connections .52
7.3.9 Design assisted by testing .52
7.4 Steel poles .52
7.4.6 Ultimate limit states (EN 1993-1-1:2005 – Chapter 6) .52
7.4.6.1 General . 52
7.4.8 Resistance of connections .53
7.4.8.2 Bolts (other than holding-down bolts) . 53
7.4.8.3 Slip joint connections . 53
7.4.8.5 Welded connections . 53
7.4.8.6 Direct embedding into the concrete . 53
7.4.9 Design assisted by testing .53
7.5 Wood poles .53
7.5.8 Design assisted by testing .53
7.6 Concrete poles .53
7.6.6 Design assisted by testing .53
7.8 Other structures .54
7.9 Corrosion protection and finishes .54
7.9.3 Metal spraying .54
7.10 Maintenance facilities .54
7.10.1 Climbing .54
7.10.3 Safety requirements .54
8 Foundations . 55
8.2 Basis of geotechnical design (EN 1997-1:2004 – Section 2) .55
8.2.2 Geotechnical design by calculation .55
8.2.3 Design by prescriptive measures .56
8.2.4 Load tests and tests on experimental models .56
8.3 Soil investigation and geotechnical data (EN 1997 1:2004 – Section 3) .56
8.6 Interactions between support foundations and soil .56
9 Conductors and earth wires . 57
9.1 Introduction .57
9.2 Aluminium-based conductors .57
9.2.3 Conductor service temperature and grease characteristics .57
9.2.4 Mechanical requirements .57
9.3 Steel-based conductors .57
9.3.3 Conductor service temperature and grease characteristics .57
9.3.4 Mechanical requirements .58

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9.5 Conductors and earth wires containing optical fibre telecommunication circuits .58
9.5.3 Conductor service temperatures .58
9.5.4 Mechanical requirements .58
10 Insulators . 59
10.2 Standard electrical requirements .59
11 Hardware . 60
11.9 Characteristics and dimensions of fittings .60
12 Quality assurance, checks and taking-over . 61
Annex J (normative) Angles in lattice steel towers . 62
Annex K (normative) Steel poles . 63
Annex M (informative) Geotechnical and structural design of foundations . 64

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European foreword

1 The French National Committee (NC) is identified by the following address:
AFNOR Normalisation
Département Electrotechnologies
11, rue Francis de Pressensé
93571 La Plaine Saint-Denis Cedex
Tel.: +33 (0)1 41 62 80 00
Fax: +33 (0)1 49 17 90 00
www.afnor.org

2 The French NC has prepared the present EN 50341-2-8:2017 (Part 2-8), listing the French National
Normative Aspects; it is solely responsible for it and has duly incorporated it into the procedures of
CENELEC and CLC/TC 11.

Note The French NC takes full responsibility for the satisfactory technical coordination of the present
Part 2-8 and EN 50341-1:2012. Any quality control/assurance checks necessary have been performed.
However, it should be noted that such quality control/assurance has been performed under the general
responsibility of the French NC pursuant to national laws and regulations.

3 Part 2-8 is normative in France and informative for other countries.

4 Part 2-8 shall be read in conjunction with EN 50341-1:2012 (Part 1). All Clause numbers used in
the present Part 2-8 correspond to the numbering in Part 1. Specific subclauses with the prefix "FR"
shall be read as amendments to the associated text in Part 1. All requests for clarification relating
to the application of Part 2-8 in relation to Part 1 shall be sent to the French NC which, in conjunction
with CLC/TC 11, will clarify the requirements.

When no reference is made to a specific subclause in Part 2-8, Part 1 applies.

5 For the "boxed values" defined in Part 1, any amended values defined in Part 2-8 shall be applied
in France. None of the boxed values present in Part 1 or Part 2-8 shall be amended in such a way
as to increase the risk in a Project Specification.

6 The regulations and standards specifically used in the present Part 2-8 and relating to overhead
electrical lines exceeding AC 1 kV are listed in subclauses 2.1/FR.1 to 2.1/FR.6.

NOTE All national standards referred to in the present Part 2-8 will be replaced by the related European
Standards as they become available and are declared applicable by the French NC and therefore reported to
the secretariat of CLC/TC 11.

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0 Introduction
Part 1 applies without change.

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1 Scope
1.1 General
(ncpt) FR.1 Scope of Part 1 and Part 2-8
Part 1 and the present Part 2-8 apply to new overhead lines as defined in 1.1/FR.2 "Definition
of a new overhead line".

(ncpt) FR.2 Definition of a new overhead line
A new overhead line denotes any new overhead electrical line exceeding AC 1 kV built on new
foundations and:
• flanked by two substations or two terminal towers preceding said substations.
or
• flanked by a substation or a terminal tower at one end and in a branch situation
(including branch tower) or tapping situation at the other end.

(ncpt) FR.3 Application to existing overhead lines
This standard does not apply to existing overhead lines exceeding AC 1 kV in France.

(ncpt) FR.4 Application to overhead lines for which technical studies are underway
Any decision to apply the requirements of the present standard to new overhead line projects
for which technical studies are underway shall be stipulated in the Project Specification.

(ncpt) FR.5 Application to overhead lines under construction
The requirements of the present standard do not apply to overhead lines under construction.

1.2 Field of application
(ncpt) FR.1 Application to radio telecommunication equipment
Part 1 and Part 2-8 apply to radio telecommunication equipment mounted on the towers of
new overhead lines, particularly with respect to wind and ice assumptions. Radio equipment
shall be arranged on the support so that it can be accessed and operations performed in
accordance with safety regulations.

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2 Normative references, definitions and symbols
2.1 Normative references
(a-dev) FR.1 Interministerial Decree of 17 May 2001
The Interministerial Decree of 17 May 2001, published in the Official Journal of the French
Republic of 12 June 2001, contains the minimum requirements for the distribution and
transmission of power.

The (a-dev) subclauses of the present Part 2-8 refer to the Interministerial Decree of 17 May
2001 and form a brief description thereof. Reference should be made to the original document
for details of the requirements of the Interministerial Decree.

(a-dev) FR.2 Law no. 91-1414 of 31 December 1991
Law no. 91-1414 of 31 December 1991 amends the French Employment Code and the French
Public Health Code to promote the prevention of occupational risks, and transposes EU
directives relating to occupational health and safety.

(a-dev) FR.3 Law no. 93-1418 of 31 December 1993
Law no. 93-1418 of 31 December 1993 amends the provisions of the French Employment
Code applicable to building and civil engineering operations to ensure the safety and protect
the health of workers, and transposes Council Directive no. 92/57/EEC of 24 June 1992. Said
directive relates to the implementation of minimum safety and health requirements at
temporary or mobile construction sites.

(a-dev) FR.4 Interministerial Decree of 14 May 1963
The Interministerial Decree of 14 May 1963 specifies the characteristics of the safety data
plates to be affixed to power line supports.

(ncpt) FR.5 Standards
Reference Title
Réseaux de distribution publique d’énergie électrique [Public electrical power
NF C11-201
systems]
Opérations sur les ouvrages et installations électriques et dans un
environnement électrique - Prévention du risque électrique [Operations on
NF C18-510
electrical networks and installations and in an electrical environment - Electrical
risk prevention]
NF EN 50540 Conductors for overhead lines. Aluminium conductors steel supported (ACSS)
NF EN 61672-1 Electroacoustics. Sound level meters. Part 1: Specifications
Justification of geotechnical work - National application standards for the
NF P94-261
implementation of Eurocode 7 - Shallow Foundations - Geotechnical design
Justification of geotechnical work - National application standards for the
NF P94-262
implementation of Eurocode 7 - Deep Foundations
Acoustics - Environmental noise characterization and measurement. Special
NF S31-010
measuring methods
Conditions techniques auxquelles doivent satisfaire les distributions d’énergie
UTE C11-001 électrique [Technical conditions to be met by electrical power distribution
systems] – Illustrated Technical Decree of 17 May 2001

(ncpt) FR.6 Reference national standards
Standard UTE C11-001 reproduces, annotates and illustrates the Interministerial Decree of 17
May 2001 (see 2.1/FR.1). Certain subclauses (a-dev or ncpt) of the present Part 2-8 are taken
from this standard.

Standard NF C11-201 defines the construction rules for the structures (overhead lines,
underground networks and substations) forming electrical power distribution networks with a
nominal voltage of less than AC 50 kV. Certain subclauses (ncpt) of the present Part 2-8 are
taken from this standard.

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The requirements relating to human safety in relation to electrical hazards during electrical or
non-electrical operations, on networks or installations or in an environment the voltage of
which is less than or equal to 500 kV AC or DC, are given in NF C18-510. The present Part 2-8
is not intended to replace the provisions of this standard.

(ncpt) FR.7 Scientific publications
[1] Ducloux, H. and Figueroa, L.: Background information about the wind action model of
CENELEC EN 50341-1 (2012) and associated expected reliability of electrical overhead lines,
Journal of Wind Engineering and Industrial Aerodynamics, Volume 157, Pages 104-117,
October 2016, ISSN 0167-6105, doi:10.1016/j.jweia.2016.08.006.

[2] Ducloux, H. and Nygaard, B. E.: 50-year return-period wet-snow load estimation based on
weather station data for overhead line design in France, Nat. Hazards Earth Syst. Sci., Volume
14 Issue 11, Pages 3031-3041, November 2014, ISSN 3031-3041, doi:10.5194/nhess-14-
3031-2014.

[3] Chaigneau, L. and Ducloux, H.: Justification du coefficient de modèle γR;d1 utilisé dans la
norme NF EN 50341-2-8 pour le dimensionnement des micropieux de catégorie 18 utilisés
comme fondations de pylônes de lignes électriques aériennes [Justification of the model factor
γ used in NF EN 50341-2-8 for the design calculation of category 18 micropiles used as
R;d1
overhead power line tower foundations], Revue Française de Géotechnique, Volume 147,
Article number 4, October 2016, DOI: 10.1051/geotech/2016008

2.2 Definitions
(a-dev) FR.1 Voltage range
In Part 2-8, the alternating high voltage ranges used are:
• The HVA range, the nominal voltage U of which is such that 1 kV < U ≤ 50 kV;
n n
• The HVB range, the nominal voltage U of which is such that U > 50 kV.
n n

(ncpt) FR.2 Cable
In Part 2-8, the term cable refers collectively to the conductors defined in 2.2.16 of Part 1
[Source: IEV 466-01-15] and the earth wires defined in 2.2.35 of Part 1 [Source: IEV 466-10-
25].

2.3 Symbols
(ncpt) FR.1 Symbols
Symbol Meaning Reference
c Minimum spacing at mid-span 5.8
d Diameter of cylindrical elements 4.12.2
d Additional distance 5.6.4
add
f Median sag of the conductor 5.8
IN Ice load per length on the cable 4.5.1
K Factor depending on the position of the conductors 5.8
c
K
z Factor depending on the climatic zone 5.8
L Free length of the insulator string 5.8
l Half-sum of the lengths of the suspension insulator strings 5.8
m' Load factor 5.8
N Thickness of the ice accretion on the cable 4.5.1
R
a1 Additional resistance 6.4.2
R Resistance to earth of the standing point 6.4.2
a2
r Resistance ratio 3.7.2
R
t Voltage clearance 5.5.3
i
Swing angle of the cables 5.8
α

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3 Basis of design
3.2 Requirements of overhead lines
3.2.2 Reliability requirements
(a-dev) FR.1 Minimum requirements for the mechanical design of overhead lines
The minimum requirements relating to the mechanical design of overhead lines are stipulated
in Clause 13 "Mechanical strength of constructions" of the Interministerial Decree of 17 May
2001.

(ncpt) FR.2 Minimum reliability level of overhead lines
The minimum reliability level to be taken into account in France is reliability level 1.

(a-dev) FR.3 Minimum requirements for the mechanical design of temporary lines
In accordance with Clauses 99a "Temporary provisions in an emergency" and 99c "Temporary
supply during work", the minimum requirements given in 3.2.2/FR.1 do not app
...