EN 50341-2-5:2017

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

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. Installations in the planning and construction stage may be completed adopting the standard edition valid at the beginning of planning.

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)

Nadzemni električni vodi za izmenične napetosti nad 1 kV - 2-5. del: Nacionalna normativna določila (NNA) za Dansko (na podlagi EN 50341-1:2012)

Ta del 2-5 se uporablja samo za nove trajne nadzemne vode in na splošno ne za obstoječe vode na Danskem. Če so na Danskem potrebna dela, povezana z načrtovanjem/projektiranjem ali izvedbo na obstoječih vodih, se morajo o obsegu uporabe tega standarda dogovoriti vpleteni stranki in pristojni organi.
Napeljave v fazi načrtovanja in izgradnje se lahko dokončajo s sprejetjem standardne izdaje, uveljavljene ob začetku načrtovanja.

General Information

• Status: Published
• Publication Date: 23-Feb-2017
• Withdrawal Date: 31-Jan-2020
• ICS: 29.240.20 - Power transmission and distribution lines
• Technical Committee: CLC/TC 11 - Overhead electrical lines exceeding 1 kV a.c. (1,5 kV d.c.)
• Drafting Committee: CLC/TC 11 - Overhead electrical lines exceeding 1 kV a.c. (1,5 kV d.c.)
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 24-Feb-2017
• Completion Date: 24-Feb-2017
• Ref Project: SIST EN 50341-2-5:2018 - Overhead electrical lines exceeding AC 1 kV – Part 2-5: National Normative Aspects (NNA) for DENMARK (based on EN 50341-1:2012)

Overview

EN 50341-2-5:2017 is a European Standard specifying the National Normative Aspects (NNA) for Denmark related to overhead electrical lines exceeding AC 1 kV. Developed by CLC and based on EN 50341-1:2012, this standard exclusively applies to new permanent overhead lines in Denmark. It encompasses detailed guidelines on the planning, design, and execution of such high-voltage electrical installations, integrating Danish national regulations and climatic conditions to ensure safety, reliability, and compliance with local legislation.

This standard is crucial for engineers, designers, and regulatory authorities involved in the construction and operation of overhead power lines, helping harmonize European standards with Danish-specific requirements.

Key Topics

• Scope and Applicability: EN 50341-2-5:2017 applies only to new permanent overhead lines in Denmark. For existing lines, application of the standard must be mutually agreed upon by stakeholders and authorities.

• National Reliability Levels: The standard defines reliability requirements specific to Denmark, generally adopting reliability level 3 for overhead line installations.

• Climatic Actions on Lines:

  • Wind Loads: Specifies reference wind speeds across Denmark, with values such as 24 m/s general and 27 m/s for the west coast of Jutland.
  • Wind Pressure: Uses an air density of 1.25 kg/m³ for calculations, constant regardless of temperature or altitude.
  • Drag Factors: Methods prescribed for determining drag factors on conductors inform structural and mechanical design choices.
  • Ice Loads and Combined Effects: Provides guidance on managing combined effects of wind and ice on line components to ensure structural integrity.

• Design Basis: National amendments to the European Part 1 standard set forth:

  • Parameters for conductor sag, deflection, and tensile stresses under Danish conditions.
  • Lattice tower and pole wind force calculations per local environmental data.

• Electrical Clearances and Safety:

  • Defines load cases for clearance calculations considering temperature, wind, and ice load combinations.
  • Establishes safety distances from residential areas, traffic routes, and recreational zones.

• Materials and Construction:

  • Sets requirements for steel materials, bolts, and welding consumables.
  • Includes geotechnical design considerations for foundations aligned with Danish soil investigation protocols.

• Earthing and Quality Assurance: Addresses earthing system design and mandates quality checks during construction, ensuring operational safety and compliance.

Applications

The standard is primarily utilized by:

• Design Engineers: To incorporate Danish normative aspects into the structural and electrical design of overhead power lines exceeding 1 kV AC.
• Construction and Installation Teams: To execute line constructions aligned with national safety and performance requirements.
• Regulatory Authorities: To assess project compliance based on harmonized European and Danish standards.
• Asset Owners and Operators: For planning lifecycle management and maintenance strategies that comply with national regulations.

EN 50341-2-5:2017 aids in:

• Enhancing electrical network safety and reliability in Denmark.
• Designing overhead lines that withstand local climatic stresses such as wind and ice.
• Harmonizing Danish electrical infrastructure with European-wide technical standards while respecting local conditions.
• Informing risk assessments related to electrical clearance and environmental safety distances.

Related Standards

• EN 50341-1:2012: The foundational European standard on overhead electrical lines exceeding AC 1 kV, forming the basis for this national normative part.
• DS/EN 1991-1-4 DK NA: Danish National Annex related to wind actions, referenced for wind velocity and load data.
• Danish Electrical Safety Act (Lov nr. 525 af 29/04/2015): Governs safety rules for electrical installations and equipment within Denmark.
• Executive Order no. 1114 - 18/08/2016: Specifies safety requirements in the construction of electrical plants.

Compliance with EN 50341-2-5:2017 ensures that new overhead lines meet both European harmonized standards and Denmark’s specific legal and environmental criteria, providing a structured approach to power transmission network development.

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Keywords: EN 50341-2-5:2017, overhead electrical lines Denmark, AC 1 kV overhead lines, Danish electrical standards, overhead line design Denmark, wind load standards, ice load overhead lines, electrical clearance, power transmission standards Denmark, CENELEC overhead lines standard.

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2018
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QRUPDWLYQDGRORþLOD11$]D'DQVNRQDSRGODJL(1
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)
Ta slovenski standard je istoveten z: EN 50341-2-5:2017
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 50341-2-5

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
Contents
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

Denmark                                -3/12-                       EN 50341-2-5:2017

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

European foreword
1 The Danish National Committee (NC) is identified by the following address:

Dansk Standard
Göteborg Plads 1
DK-2150 Nordhavn
Phone no. [phone]
E-mail: [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 50341-2-
5 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                                -5/
...