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eLibrary > BS EN 50341-2-7:2023 - TC Tracked Changes. Overhead electrical lines exceeding AC 1 kV - National Normative Aspects (NNA) for FINLAND (based on EN 50341-1:2012) >

BS EN 50341-2-7:2023 - TC Tracked Changes. Overhead electrical lines exceeding AC 1 kV - National Normative Aspects (NNA) for FINLAND (based on EN 50341-1:2012), 2024

A-30480614.pdf [Go to Page]
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European foreword
1 Scope [Go to Page]
1.1 General
1.2 Field of application
2 Normative references, definitions and symbols [Go to Page]
2.1 Normative references
3 Basis of design [Go to Page]
3.2 Requirements of overhead lines
3.2.2 Reliability requirements
3.2.5 Strength coordination
4 Actions on lines [Go to Page]
4.3 Wind loads
4.3.1 Field of application and basic wind velocity
4.3.2 Mean wind velocity
4.3.3 Mean wind pressure
4.4 Wind forces on overhead line components
4.4.1 Wind forces on conductors
4.4.1.1 General
4.4.1.2 Structural factor
4.4.1.3 Drag factor
4.4.2 Wind forces on insulator sets
4.4.3 Wind forces on lattice towers
4.4.3.1 General
4.4.4 Wind forces on poles
4.5 Ice loads
4.5.1 General
4.6 Combined wind and ice loads
4.6.2 Drag factors and ice densities
4.7 Temperature effects
4.8 Security loads
4.9 Safety loads
4.9.1 Construction and maintenance loads
4.12 Load cases
4.12.1 General
4.12.2 Standard load cases
4.13 Partial factors for actions
5 Electrical requirements [Go to Page]
5.5 Minimum air clearance distances to avoid flashover
5.5.1 General
5.6 Load cases for calculation of clearances
5.6.1 Load conditions
5.6.2 Maximum conductor temperature
5.6.3 Ice loads for determination of electric clearances
5.8 Internal clearances within the span and at the top of the support
5.9 External clearances
5.9.1 General
5.9.2 External clearances to ground in areas remote from buildings, roads etc.
5.9.3 External clearances to residential and other buildings
5.9.4 External clearances to crossing traffic routes
5.9.6 External clearances to other power lines or telecommunication lines
6 Earthing systems [Go to Page]
6.1 Introduction
6.1.4 Transferred potentials
6.4 Dimensioning regarding human safety
6.4.3 Design of earthing systems regarding permissible touch voltage
7 Supports [Go to Page]
7.3 Lattice steel towers
7.3.1 General
7.3.6 Ultimate limit states
7.3.6.1 General
7.3.6.4 General
7.3.9 Design assisted by testing
7.5 Wood poles
7.5.3 Materials
7.5.5 Ultimate limit states
7.5.5.1 Basis
7.5.5.2 Calculation of internal forces and moments
7.5.5.3 Resistance of wood elements
7.5.5.4 Decay conditions
7.7 Guyed structures
7.7.1 General
7.7.4 Ultimate limit states
7.7.4.1 Basis
7.7.4.3 Second order analysis
7.7.6 Design details for guys
7.10 Maintenance facilities
7.10.3 Safety requirements
8 Foundations [Go to Page]
8.1 Introduction
8.2 Basis of geotechnical design
8.2.1 General
8.2.2 Geotechnical design by calculation
8.2.3 Design by prescriptive measures
9 Conductors and earth wires [Go to Page]
9.1 Introduction
9.6 General requirements
9.6.2 Partial factor for conductors
10 Insulators [Go to Page]
10.2 Standard electrical requirements
10.11 Type test requirements
11 Hardware [Go to Page]
11.6 Mechanical requirements
11.8 Material selection and specification
12 Quality assurance, checks and taking-over
Annex J [Go to Page]
J.4 Buckling resistance of angles in compression
J.4.3 Slenderness of members
J.4.3.1 General
J.4.4 Secondary bracing members [Go to Page]

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