NEN EN 50341-1 : 2013

Introduction
1 Scope
2 Definition, symbols and references
   2.1 Definitions
   2.2 List of symbols
   2.3 References
3 Basis of design
   3.1 General
   3.2 Requirements
   3.3 Limit states
   3.4 Actions
   3.5 Material properties
   3.6 Modelling for structural analysis and resistance
   3.7 Design values and verification method
4 Actions on lines
   4.1 Introduction
   4.2 Actions, General approach
   4.3 Actions, Empirical approach
5 Electrical requirements
   5.1 Voltage classification
   5.2 Currents
   5.3 Insulation co-ordination
   5.4 Internal and external clearances
   5.5 Corona effect
   5.6 Electric and magnetic fields
6 Earthing systems
   6.1 Purpose
   6.2 Dimensioning of earthing systems at power frequency
   6.3 Construction of earthing systems
   6.4 Earthing measures against lighting effects
   6.5 Measurements for and on earthing systems
   6.6 Site inspection and documentation of earthing systems
7 Supports
   7.1 Initial design considerations
   7.2 Materials
   7.3 Lattice steel towers
   7.4 Steel poles
   7.5 Timber poles
   7.6 Concrete poles
   7.7 Guyed structures
   7.8 Other structures
   7.9 Corrosion protection and finishes
   7.10 Maintenance facilities
   7.11 Loading tests
   7.12 Assembly and erection
8 Foundations
   8.1 Introduction
   8.2 General requirements
   8.3 Soil investigation
   8.4 Loads acting on the foundations
   8.5 Geotechnical design
   8.6 Loading tests
   8.7 Structural design
   8.8 Construction and installation
9 Conductors and overhead earthwires (ground wires) with or
   without telecommunication circuits
   9.1 Introduction
   9.2 Aluminium based conductors
   9.3 Steel based conductors
   9.4 Copper based conductors
   9.5 Conductors (OPCON's) and ground wires (OPGW's)
       containing fibre telecommunication circuits
   9.6 General requirements
   9.7 Test reports and certificates
   9.8 Selection, delivery and installation of conductors
10 Insulators
   10.1 General
   10.2 Standard electrical requirements
   10.3 RIV requirements and corona extinction voltage
   10.4 Pollution performance requirements
   10.5 Power arc requirements
   10.6 Audible noise requirements
   10.7 Mechanical requirements
   10.8 Durability requirements
   10.9 Material selection and specification
   10.10 Characteristics and dimensions of insulators
   10.11 Type test requirements
   10.12 Sample test requirements
   10.13 Routine test requirements
   10.14 Summary of test requirements
   10.15 Test reports and certificates
11 Line equipment - Overhead line fittings
   11.1 General
   11.2 Electrical requirements
   11.3 RIV requirements and corona extinction voltage
   11.4 Magnetic characteristics
   11.5 Short circuit current and power arc requirements
   11.6 Mechanical requirements'
   11.7 Durability requirements
   11.8 Material selection and specification
   11.9 Characteristics and dimensions of fittings
   11.10 Type test requirements
   11.11 Sample test requirements
   11.12 Routine test requirements
   11.13 Test reports and certificates
   11.14 Selection, delivery and installation of fittings
12 Quality assurance, checks and taking-over
   12.1 Quality assurance
   12.2 Checks and taking-over
Annex A (informative) Strength coordination
        A.1 Recommended design criteria
        A.2 Proposed strength coordination
Annex B (informative) Extreme wind speeds and ice loads
        B.1 Definition of symbols used in this annex
        B.2 Evaluation of extreme wind speed data
        B.3 Definition of extreme ice load
        B.4 Statistical ice parameters
        B.5 Extreme ice load evaluation based on various data sources
        B.6 Combination of wind speeds and ice loads
Annex C (informative) Special forces
        C.1 Definitions of symbols used in this annex
        C.2 Forces due to short circuit currents
        C.3 Avalanches, creeping snow
        C.4 Earthquakes
Annex D (informative) Statistical data for the Gumbel
        distribution of extremes
        D.1 Definitions of symbols used in this annex
        D.2 The Gumbel distribution
        D.3 Example of using C[1] and C[2]
        D.4 Calculation of C[1] and C[2]
Annex E (normative) Electrical requirements
        E.1 Definitions of symbols used in this annex
        E.2 Insulation co-ordination
Annex F (informative) Electrical requirements
        F.1 Definition of symbols used in this annex
        F.2 Insulation co-ordination. Examples of calculation
             of D[el], D[pp] and D[50 Hz] for different system
             voltages
Annex G (normative) Earthing systems
        G.1 Definition of symbols used in this annex
        G.2 Minimum dimensions of earth electrode materials
             ensuring mechanical strength and corrosion resistance
        G.3 Current rating calculation
        G.4 Touch voltage and body current
        G.5 Measuring touch voltages
        G.6 Reduction factor related to earthwires of overhead
             lines
Annex H (informative) Earthing systems
        H.1 Definition of symbols used in this annex
        H.2 Basis for the verification
        H.3 Installation of earth electrodes and earthing conductors
        H.4 Measurements for and on earthing systems
Annex J (normative) Lattice steel towers
        J.1 Definition of symbols used in this annex
        J.2 Classification of cross sections
        J.3 Section properties
        J.4 Check of cross section resistance
        J.5 Check of the buckling resistance of members
        J.6 Buckling length of members
        J.7 Additional recommendations on bracing patterns
        J.8 Calculation of effective slenderness lambda [eff]
        J.9 Selection of buckling cases for angles
        J.10 Secondary (redundant) members
        J.11 Bolted connections
Annex K (normative) Steel poles
        K.1 Definition of symbols used in this annex
        K.2 Classification of cross sections
        K.3 Effective cross-sections properties of class 4
            cross-sections
        K.4 Resistance of circular cross sections, without opening,
            under preponderant bending moment
        K.5 Resistance of polygonal cross sections, without opening,
            under preponderant bending moment
        K.6 Design of holding-down bolts
Annex L (informative) Design requirements for supports and foundations
        L.1 Structural requirement
        L.2 Configuration requirements: types of supports and uses
        L.3 Phase conductor and earthwire attachment
        L.4 Foundation steelwork
        L.5 Erection/maintenance facilities
        L.6 Mass-length restrictions
Annex M (informative) Typical values of the geotechnical parameters
        of soils and rocks
        M.1 General
        M.2 Definitions
        M.3 Units
Annex N (informative) Conductors and overhead earthwires
        N.1 Specification of conductors and earthwires
        N.2 Selection of conductors and earthwires
        N.3 Packing and delivery of conductors and earthwires
        N.4 Precautions during installation of conductors and
            earthwires
Annex P (informative) Tests on overhead line insulators and
        insulator sets in porcelain and glass insulating materials
Annex Q (informative) Insulators
        Q.1 Specification of insulators
        Q.2 Selection of insulators
        Q.3 Packing and delivery of insulators
        Q.4 Precautions during installation of insulators
Annex R (informative) Line equipment - Overhead line fittings
        R.1 Specification and selection of fittings
        R.2 Packing and delivery of fittings
        R.3 Precautions during installation of fittings

Pertains to new overhead electric lines with nominal system voltages exceeding AC 1 kV and with rated frequencies below 100 Hz.