Bsi bs en 50341 2 5 2017

BS EN 50341-2-5:2017

BSI Standards Publication

Overhead electrical lines
exceeding AC 1 kV – Part 2-5:
National Normative Aspects
(NNA) for DENMARK (based on
EN 50341-1:2012)


BS EN 50341-2-5:2017

BRITISH STANDARD
National foreword
This British Standard is the UK implementation of EN 50341-2-5:2017.
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 50341-2-5:2017
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BS EN 50423-3:2005 and BS EN 50341-3:2001 will be withdrawn upon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 0 580 97923 1
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/corrigenda issued since publication
Date

Text affected


BS EN 50341-2-5:2017

EN 50341-2-5

EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM

February 2017

ICS 29.240.20

English Version

Overhead electrical lines exceeding AC 1 kV - Part 2-5: National
Normative Aspects (NNA) for DENMARK
(based on EN 50341-1:2012)
Lignes électriques aériennes dépassant 1 kV en courant
alternatif - Partie 2-5: Aspects normatifs nationaux
(NNA)pour le DANEMARK (basé sur l'EN 50341-1:2012)

This European Standard was approved by CENELEC on 2017-02-01.

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 50341-2-5:2017 E


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EN 50341-2-5:2017

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Contents

Denmark

Page

European foreword ........................................................................................................................................ 4
1
Scope .................................................................................................................................................. 5
1.1 DK.1 Reliability levels ........................................................................................................................... 5
2
Normative references, definitions and symbols .................................................................................. 5
2.1 DK.1 Normative references ................................................................................................................. 5
2.3
DK.1 Symbols ................................................................................................................................... 5
3
Basis of design .................................................................................................................................... 6
3.2
Requirements of overhead lines ........................................................................................................ 6

3.2.2 DK.1 Reliability levels ........................................................................................................................ 6
4
Actions on lines ................................................................................................................................... 6
4.1 DK.1 Introduction ................................................................................................................................... 6
4.3
Wind loads ......................................................................................................................................... 6
4.3.1 DK.1 Field of application and basic wind velocity .............................................................................. 6
Table 4.3.1/DK.1 - Reference wind speeds in Denmark ............................................................................... 6
4.3.3 DK.1 Mean wind pressure .................................................................................................................. 6
4.4
Wind forces on overhead line components ....................................................................................... 6
4.4.1 Wind forces on conductors ................................................................................................................ 6
4.4.1.1 DK.1 General ..................................................................................................................................... 6
DK.2 General ................................................................................................................................................. 6
4.4.1.3 DK.1 Drag factor ................................................................................................................................ 7
4.4.3 Wind forces on lattice towers ............................................................................................................. 7
4.4.3.1 DK.1 General ................................................................................................................................... 7
4.4.4 DK.1 Wind forces on poles ................................................................................................................ 7
4.5
Ice loads ............................................................................................................................................ 7
4.5.1 DK.1 General ..................................................................................................................................... 7
4.5.2 DK.1 Ice forces on conductors .......................................................................................................... 7
4.6
Combined wind and ice loads ............................................................................................................ 7
4.6.6 Combination of wind velocity and ice loads ...................................................................................... 7
4.6.6.1 DK.1 Extreme ice load IT combined with a high probability wind velocity VIH .............................. 7
4.6.6.2 DK.1 Nominal ice load l3 combined with a low probability wind velocity VIL ................................. 7
4.7
DK.1 Temperature effects .................................................................................................................. 7
4.8

Security loads .................................................................................................................................... 7
4.8.2 DK.1 Torsional loads ......................................................................................................................... 8
4.8.3 DK.1 Longitudinal loads .................................................................................................................... 9
4.12 Load cases ........................................................................................................................................ 9
4.12.1 DK.1 General ..................................................................................................................................... 9
4.12.2 DK.1 Standard load cases ................................................................................................................. 9
4.13 DK.1 Partial factors for actions .......................................................................................................... 9
5
Electrical requirements ........................................................................................................................ 9
5.6 Load cases for calculation of clearances ............................................................................................ 9
5.6.1 DK.1 Load conditions ......................................................................................................................... 9
5.6.2 DK.1 Maximum conductor temperature.............................................................................................. 9
5.6.3 DK.1 Wind loads for determination of electric clearances.................................................................. 9
5.6.3.2 DK.1 Nominal wind loads for determination of internal and external clearances .......................... 10
5.6.4 DK.1 Ice loads for determination of electric clearances ................................................................. 10
5.6.5 DK.1 Combined wind and ice loads .................................................................................................. 10
5.8 DK.1 Internal clearances within the span and at the top of support .................................................. 10
5.9
External clearances .......................................................................................................................... 10
5.9.3
DK.1 External clearances to residential and other buildings ......................................................... 10
5.9.4
DK.1 External clearances to crossing traffic routes ...................................................................... 10
5.9.7
DK.1 External clearances to recreational areas (playgrounds, sports areas, etc.) ....................... 10
6
Earthing systems .......................................................................................................................... 11
7
Supports ....................................................................................................................................... 11
7.1

Initial design considerations ......................................................................................................... 11
7.1.1
DK.1 Introduction ........................................................................................................................... 11
7.2.1
DK.1 Steel materials, bolts, nuts and washers, welding consumables ......................................... 11


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7.2.4
DK.1 Holding-down bolts ............................................................................................................... 11
7.3.6
Ultimate limit states ..................................................................................................................... 11
7.3.6.1
DK.1 General .............................................................................................................................. 11
7.4.6.1
DK.1 General .............................................................................................................................. 11
7.4.8
Resistance of connections .......................................................................................................... 11
7.4.8.3
DK.1 General .............................................................................................................................. 11
7.6.4

DK.1 Ultimate limit states .............................................................................................................. 11
8
Foundations .................................................................................................................................. 12
8.2.2
DK.1 Geotechnical design by calculation ...................................................................................... 12
8.3
DK.1 Soil investigation and geotechnical data (EN 1997-1:2004 – Section 3) ............................. 12
9
Conductors and earth-wires ......................................................................................................... 12
10
Insulators ..................................................................................................................................... 12
10.1 DK.1 Introduction .............................................................................................................................. 12
10.7 DK.1 Mechanical requirements ........................................................................................................ 12
11
Hardware ..................................................................................................................................... 12
12
Quality assurance, checks and taking-over ................................................................................ 12


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Denmark

European foreword
1

The Danish National Committee (NC) is identified by the following address:
Dansk Standard
Göteborg Plads 1
DK-2150 Nordhavn
Phone no.
+45 39 96 61 01
E-mail:

2

The Danish NC has prepared this Part 2-5 of EN 50341, listing the Danish national normative aspects,
under its sole responsibility, and duly passed it through the CENELEC and CLC/TC 11 procedures.
NOTE The Danish NC also takes sole responsibility for the technically correct coordination of this EN 50341-25 with EN 50341-1:2012. It has performed the necessary checks in the frame of quality assurance/control. It is
noted however that this quality assurance/control has been made in the framework of the general responsibility
of a standards committee under the national laws/regulations.

3

This EN 50341-2-5 is normative in Denmark and informative for other countries.

4

This EN 50341-2-5 has to be read in conjunction with EN 50341-1:2012, hereinafter referred to as Part
1. All clause numbers used in this Part 2-5 correspond to those of Part 1.
Specific sub clauses, which are prefixed “DK”, are to be read as amendments to the relevant text in
Part 1. Any necessary clarification regarding the application of Part 2-5 in conjunction with Part 1 shall
be referred to the Danish NC who will, in cooperation with CLC/TC 11 clarify the requirements.
When no reference is made in Part 2-5 to a specific sub clause, then Part 1 applies.

5

In the case of “boxed values” defined in Part 1, amended values (if any) which are defined in Part 2-5
shall be taken into account in Denmark.
However any “boxed values“, whether in Part 1 or Part 2-5, shall not be amended in the direction of
greater risk in a Project Specification.

6

The national Danish standards/regulations related to overhead electrical lines exceeding 1 kV (AC)
are identified in 2.1/DK1.
NOTE All national standards referred to in this Part 2-5 will be replaced by the relevant European Standards as
soon as they become available and are declared by the Danish NC to be applicable and thus reported to the
secretary of CLC/TC 11.


Denmark

1

Scope

(snc)

1.1

(ncpt)

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EN 50341-2-5:2017

This Part 2-5 is applicable for new permanent overhead lines only and generally not for
existing lines in Denmark. If some planning/design or execution work on existing lines in
Denmark has to be performed, the degree of application of this Standard shall be agreed
upon by the parties concerned and the authorities.
DK.1 General
Installations in the planning and construction stage may be completed adopting the standard
edition valid at the beginning of planning.

2

Normative references, definitions and symbols

2.1

DK.1

(A-dev)

Normative references

Lov nr. 525 af 29/04/2015.
Lov om sikkerhed ved elektriske anlæg, elektriske installationer og elektrisk materiel
(Elsikkerhedsloven)
Act No. 525 - 29/04/2015.
Act on the Safety of Electrical Plants, Electrical Installations and Electrical Equipment (the

Electrical Safety Act)
Bekendtgørelse nr. 1114 af 18/08/2016
Bekendtgørelse om sikkerhed for udførelse af elektriske anlæg
Executive Order no. 1114 - 18/08/2016
Executive Order on Safety in connection with the Construction of Electrical Plants

2.3

(ncpt)

DK.1 Symbols

Symbol

Signification

Reference

L

Length of the intact span [m]

4.8.2/DK.1

E

Modulus of elasticity of the conductor [N/mm2]

4.8.2/DK.1

γ

Weight of the conductor including possible external

4.8.2/DK.1

Load divided by the cross-sectional area [N/m/mm2]
σ

Tensile stress in the conductor prior to breakage [N/mm2]

4.8.2/DK.1

I

Max movement of movable suspension in the direction

4.8.2/DK.1

of the line [m]
u

Deflection of the support in the direction of the line at the

4.8.2/DK.1

attachment point of the insulator [m]
d

Horizontal conductor swing [m]

5.6.3.2/DK.1


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y0

Overhead line sag at 0°C [m]

5.6.3.2/DK.1

Ik

Distance from the attachment point of the conductor

5.6.3.2/DK.1

and the turning point of the insulator string [m]
3

Basis of design

3.2

Requirements of overhead lines

3.2.2

DK.1 Reliability requirements

(ncpt)

4

One reliability level generally applies corresponding to level 3.
Actions on lines

4.1 DK.1 Introduction
(snc)

4.3

For assessment of climatic data to determine numerical values for action approach 1 is
applied.
Wind loads

4.3.1 DK.1 Field of application and basic wind velocity
(snc)

The basic wind velocity, Vb,0 can be taken as given in Table 4.3.1 below
Table 4.3.1/DK.1 - Reference wind speeds in Denmark
Part of the country

Reference wind speed

The whole of Denmark, however
with the exceptions mentioned below

24 m/s

The west coast of Jutland

27 m/s

From the west coast line of Jutland
and 25 km inland

Linear declination from
27 m/s to 24 m/s

Further information can be found in DS/EN 1991-1-4 DK NA.
4.3.3 DK.1 Mean wind pressure
(snc)

4.4
4.4.1

Density of air of ρ=1.25 kg/m3 is used in Denmark. This is independent of temperature and
altitude.
Wind forces on overhead line components
Wind forces on conductors

4.4.1.1 DK.1 General

(ncpt)

(ncpt)

Method 4 in Table 4.3 should be used for the determination of the reference height above
ground, h of the conductors.
DK.2 General
For calculation of the mechanical tension in a section, the equivalent mean section length
should be used as the span length.


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4.4.1.3 DK.1 Drag factor
(npct)

Method 1 or 2 shall be used for determination of the drag factor of the conductors.
4.4.3 Wind forces on lattice towers
4.4.3.1 DK.1 General
(npct)

Method 1 should be used for determining the wind forces on the tower itself.

4.4.4

DK.1 Wind forces on poles

(ncpt)

Method 2 is used for determination of the reference height for the pole.
The reference height should be 60% of the total height.

4.5

Ice loads

4.5.1

DK.1 General

(ncpt)

No ice loads apply on insulators or towers.
DK.2 Characteristic ice load

(snc)

The characteristic ice load, I, on a conductor with the diameter d in mm is I = 12 + 0.9 d [N/m]
The ice is considered as glaze ice. For a 30 mm conductor the value reflects a 50-year return
period load.
Density of ice is 900 kg/m3.

4.5.2

DK.1 Ice forces on conductors

(ncpt)

The vertical ice force on a support from each sub-conductor is QI = I (LW1+LW2)/2
4.6

Combined wind and ice loads

4.6.6

Combination of wind velocity and ice loads

4.6.6.1
(snc)

ΨW = 0.4
Only the extreme ice load combined with the reduced wind load have to be investigated, i.e.
I = 0.

4.6.6.2
(snc)

DK.1 Extreme ice load IT combined with a high probability wind velocity VIH

DK.1 Nominal ice load l3 combined with a low probability wind velocity VIL
This situation should not be investigated in Denmark.

4.7

(snc)

DK.1 Temperature effects
The following temperature effects should be considered:
a) A minimum temperature to be considered with no other climatic action: -20 °C
b) A normal ambient reference temperature assumed for the extreme wind velocity condition:
5 °C
c+d) Not relevant
e) A temperature to be used for the combination of wind and ice: 0 °C.

4.8

Security loads


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4.8.2

(ncpt)

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Denmark

DK.1 Torsional loads
The β-method shall be applied and calculated in accordance with an accepted model,

simulating the residual situation after a conductor breakage.
Simplified β can be found using the diagram in Figure 4.8.2/DK.1.

Figure 4.8.2/DK.1 - Tension reduction factor

where:
2

X =

E  L
γ  ;
σ  σ

Y =

E I +u
σ L

L

the length of the intact span [m]

E

the modulus of elasticity of the conductor [N/mm²]

γ

the weight of the conductor including possible external load divided by the

cross-sectional area [N/m/mm²]

σ

the tensile stress in the conductor prior to breakage [N/mm²]

I

the max. movement of movable suspension in the direction of the line [m]

u

the deflection of the support in the direction of the line at the attachment
point of the insulator [m]

NOTE The basis of the simplified method is reported in CIGRÉ paper 22-10, 1976.

The number of released conductors is as follows:
-

single and double circuit lines
multiple circuit lines

1
2

The number of broken sub-conductors in a bundle conductor can be taken as half the sum of
sub-conductors.

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The partial factor, γA1, to be 1.5, however for secondary parts of suspension supports, i.e. tower
peak and cross-arm peaks which do not support other conductors, the partial factor, γA1, may be
reduced to 1.0.
4.8.3

(ncpt)

4.12

DK.1 Longitudinal loads
The β-method shall be applied and calculated in accordance with an accepted model, simulating
the residual situation after breakage of all conductors including all sub-conductors in bundle
conductors, overhead ground wires, etc. on one side of the support. The simplified method as
given in 4.8.2/DK.1 can be used.
Derived β-values are multiplied by 0.80.
Load cases

4.12.1 DK.1 General
(ncpt)

The same sub clauses shall apply for overhead lines exceeding a nominal system voltage AC 1
kV up to and including AC 45 kV as for overhead lines exceeding a nominal system voltage AC
45 kV.

4.12.2 DK.1 Standard load cases
(ncpt)

The following reduction factors shall be used:
α = 0.0
α1 = 0.0
α2 = 0.5 on all spans
α3 = 0.0
α4 = 0.0
NOTE
Attention should be paid to the limited effect of unbalanced ice loads on suspension supports
as referred to in the note in 4.8.3.

4.13

(snc)

DK.1 Partial factors for actions
Partial factors on Torsional security loads are given in section 4.8.2/DK.1

5

Electrical requirements

5.6

Load cases for calculation of clearances

5.6.1 DK.1
(ncpt)

5.6.2 DK.1
(ncpt)

5.6.3 DK.1

Load conditions
Load cases for calculation of clearances
Three different load cases have to be considered in Denmark:
- Maximum conductor temperature (given in 5.6.2/DK.1).
- Nominal wind load (given in 5.6.3.3/DK.1).
- Ice loads (given in 5.6.4/DK.1).
- Extreme Ice load.
- Uneven Ice load.
The load cases are detailed below.
Maximum conductor temperature
The clearances should be based on the maximum continuous service temperature of the
conductor specified in the Project Specification.
Wind loads for determination of electric clearances


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5.6.3.2 DK.1

(ncpt)

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Denmark

Nominal wind loads for determination of internal and external clearances

For external clearances the following method shall be used:
On a given location X in a conductor span between two towers the value of the horizontal
conductor swing (d) under wind influence is determined as follows:
d = 0.75⋅(y0 + lk)
y0 is the overhead line sag (in metres) at the point X at 0 °C.
lk is the distance (in metres) from the attachment point of the conductor and the turning point of
the insulator string. If lk is different at the two end points of a span, the mean value shall be used.
By using post insulators or V-string insulators lk = 0 is used.

(ncpt)

5.6.4

(ncpt)

DK.2 Galloping condition
The conductor deflection for Galloping Condition shall be investigated according to the Project
Specification.
DK.1

Ice loads for determination of electric clearances

For all not specified clearances the specified ice load given in 4.5.1/DK.2, shall be used.
Uneven ice load:
Uneven ice load is calculated as the half of the ice load defined in 4.5.1/DK.2 and shall be
assumed in the crossing span and no ice load in all the other spans of the line section
Uneven ice load is to be applied in addition to extreme ice load in table. 5.11 and 5.12.

5.6.5
(snc)

5.8

(ncpt)

5.9
5.9.3

(ncpt)

5.9.4

(ncpt)

5.9.7

(ncpt)

DK.1 Combined wind and ice loads
A verification of clearances under combined wind and ice loads is not required.
DK.1 Internal clearances within the span and at the top of support
k1 is defined as 0.7 for use in table 5.8 and annex F.

External clearances
DK.1

External clearances to residential and other buildings

It is not allowed in Denmark for overhead lines to cross buildings with non-fire resistant roofs
and fire sensitive installations.
Following addition to table 5.11 are valid for protection system B:
Uneven Ice load:
To clearance case: ‘With fire resistant roofs where the slope is less than or equal to
15°to the horizontal’:
4 m + Del but at least 5 m.
For other clearance cases:
2 m + Del but at least 3 m.
DK.1

External clearances to crossing traffic routes

Following addition to table 5.12 are valid for protection system B:
Uneven Ice load:
To clearance case: ‘Top of road’:
4.5 m + Del
- For other clearance cases:
Del
DK.1

External clearances to recreational areas (playgrounds, sports areas, etc.)

It is not allowed in Denmark for overhead lines to cross sport facilities and swimming pools

Denmark

6

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Earthing systems
Part 1 applies without change

7

Supports

7.1

Initial design considerations

7.1.1

DK.1

(ncpt)

Introduction

Where Eurocodes are specified in the standard, these codes are valid without applying the
Danish National Annex. Boxed values of partial factors are used, unless stated otherwise in
this standard or the present National Complements.

7.2

Materials

7.2.1

DK.1

(ncpt)

7.2.4

(ncpt)

Steel materials, bolts, nuts and washers, welding consumables

The Execution Class according to EN 1090-2 is normally EXC 2. EXC 3 or EXC 4 may be
chosen in Project Specification.
DK.1

Holding-down bolts

Straight undeformed anchors (Annex K.6) are not allowed for round bars without bends or
plates.

7.3

Lattice steel towers

7.3.6

Ultimate limit states

7.3.6.1

DK.1 General

(ncpt)

7.4
7.4.6.1
(ncpt)

For lattice steel towers the following partial coefficients shall be used:
1.1
γM0 =
1.1
γM1 =
1.25
γM2 =
Steel poles
DK.1 General
For steel poles the following partial coefficients shall be used:
1.1

γM0 =
1.1
γM1 =
1.25
γM2 =

7.4.8

Resistance of connections

7.4.8.3

DK.1 General

(ncpt)

For slip joints the conicity of the pole body based on the diameter shall be >10 mm/m.

7.6

Concrete poles

7.6.4

DK.1 Ultimate limit states

(ncpt)

For concrete poles the following partial coefficients shall be used:
1.45

γMC =
1.2
γMS =


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8

Foundations

8.2

Basis of geotechnical design (EN 1997-1:2004 – Section 2)

8.2.2

DK.1

(ncpt)

Denmark

Geotechnical design by calculation

Methods for Geotechnical design shall follow the methods given in EN 1997-1 DK NA

Driven piles should be analysed according to the method described in EN 1997-1 DK NA,
Annex L.
For ground properties the following partial factors for soil parameters shall be used:
1.2
γφ’ =
1.2
γc’ =
1.8
γcu =
The partial factors for driven piles should be: γ = 1.3
Other values for partial factors and correlation factors should be taken from EN 1997-1 DK
NA.
Pile foundation
For pile foundations the resistance is calculated according to 8.2.2 with the following partial
factors:
γ = 1.8 (For resistance found without load test)
γ = 1.4 (For resistance found with load test)
γ = 1.3 (For resistance where the actual pile has been tested)

8.3

(ncpt)

9

DK.1

Soil investigation and geotechnical data (EN 1997-1:2004 – Section 3)

The structure of the soil below surface, down to a depth greater than two times the footing

effective width, and in case of a piled foundation, greater than the pile tip depth, shall be
known in sufficient detail.
Conductors and earth-wires
Part 1 applies without change

10
10.1

(ncpt)

10.7

(ncpt)

Insulators
DK.1 Introduction
Fail safe insulators should be used when crossing highways and main roads. Fail safe
insulators are cap and pin insulators. Alternatively, shall double long rod or composite
insulators be used.
DK.1 Mechanical requirements
The partial material factor for all types of insulators shall have a minimum value of: γm =2.0.

11

Hardware
Part 1 applies without change

12

Quality assurance, checks and taking-over

Part 1 applies without change


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