General

SK.1 New overhead line

As a new overhead line is considered a brand new electric overhead line with nominal voltage exceeding 1 kV AC, between the points A and B.

The new branch line of the existing overhead line shall be considered as a new overhead line except for a junction support for which the specific requirements shall be defined in the Project Specification.

The extent of application of this standard in respect of reconstruction, relaying and extension of existing overhead lines shall be determined in the Project Specification. Simultaneously, the Project Specification shall determine, which of the previous national standards shall be used and to what extent they shall be used for the project in question.

1.2 Field of application

SK.1 Field of application

The requirements of this standard shall be adopted, where applicable (e.g. requirements on loads, external clearances, etc.), for telecommunication cables as well.

In case of overhead line under the design stage, parties concerned shall agree the extent of the application of this standard.

Overhead line under construction may be completed according to standards valid during the design stage of the line. The parties concerned shall agree any possible application of certain clauses of this standard.

SK.2 Installation of telecommunication equipment on supports

Provisions of this standard also apply to the telecommunication equipment and devices (aerials, dish antennas, etc.) which are installed on individual supports of overhead power lines, especially in terms of wind and ice loads on such installed equipment. Design and installation has to respect requirements of the utility operating the line in question. The design of such telecommunication equipment has to incorporate such technical solutions and such precautions, which shall allow safe access and maintenance of both a power line and telecommunication equipment, and which shall provide protection of persons performing repairs or maintenance of the power line and/or telecommunication equipment against electric shock and protection of telecommunication equipment and attached installations against the influence of the power line (short-circuits, switching and lightning overvoltages etc.).

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PDF Pages	PDF Title
9	1 Scope 1.1 General 1.2 Field of application 2 Normative references, definitions and symbols 2.1 Normative references
12	2.2 Definitions 2.3 Symbols
14	3 Basis of design 3.2 Requirements of overhead lines 3.2.2 Reliability requirements 3.2.5 Strength coordination 3.2.6 Additional considerations
15	4 Actions on lines 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
16	4.4.1.2 Structural factor 4.4.1.3 Drag factor 4.4.2 Wind forces on insulator sets
17	4.4.3 Wind forces on lattice towers 4.4.3.1 General 4.4.3.2 Method 1 4.4.4 Wind forces on poles 4.5 Ice loads 4.5.1 General
19	4.6 Combined wind and ice loads 4.6.1 Combined probabilities 4.6.2 Drag factors and ice densities 4.6.5 Wind forces on support for ice covered conductors 4.6.6 Combination of wind velocities and ice loads 4.6.6.1 Extreme ice load IT combined with a high probability wind velocity VIH 4.6.6.2 Nominal ice load I3 combined with a low probability wind velocity VIL
20	4.7 Temperature effects 4.8 Security loads 4.8.1 General 4.8.2 Torsional loads
21	4.8.3 Longitudinal loads 4.9 Safety loads 4.9.1 Construction and maintenance loads 4.9.2 Loads related to the weight of linesmen 4.10 Forces due to short-circuit currents 4.11 Other special forces 4.11.1 Avalanches, creeping snow
22	4.11.2 Earthquakes 4.12 Load cases 4.12.1 General 4.12.2 Standard load cases
23	4.13 Partial factors for actions
27	5 Electrical requirements 5.3 Insulation coordination
28	5.4 Classification of voltages and overvoltages 5.4.2 Representative power frequency voltages 5.5 Minimum air clearance distances to avoid flashover 5.5.2 Application of the theoretical method in Annex E 5.5.3 Empirical method based on European experience
29	5.6 Load cases for calculation of clearances 5.6.2 Maximum conductor temperature 5.6.3 Wind loads for determination of electric clearances 5.6.3.1 Wind load cases 5.6.3.2 Nominal wind loads for determination of internal and external clearances
30	5.6.3.3 Extreme wind loads for determination of internal clearances 5.6.4 Ice loads for determination of electric clearances
31	5.6.5 Combined wind and ice loads 5.7 Coordination of conductor positions and electrical stresses
32	5.8 Internal clearances within the span and at the top of support
35	5.9 External clearances 5.9.1 General
36	5.9.2 External clearances to ground in areas remote from buildings, roads, etc. 5.9.3 External clearances to residential and other buildings
38	5.9.4 External clearances to crossing traffic routes
41	5.9.5 External clearances to adjacent traffic routes 5.9.6 External clearances to other power lines or overhead telecommunication lines
43	5.10 Corona effect 5.10.1 Radio noise 5.10.1.3 Noise limits 5.11 Electric and magnetic fields 5.11.1 Electric and magnetic fields under a line 5.11.2 Electric and magnetic field induction 5.11.3 Interference with telecommunication circuits
44	6 Earthing systems 6.1 Introduction 6.1.2 Requirements for dimensioning of earthing systems 6.1.3 Earthing measures against lightning effects
45	6.1.4 Transferred potentials 6.2 Ratings with regard to corrosion and mechanical strength 6.2.1 Earth electrodes
46	6.2.2 Earthing and bonding conductors 6.4 Dimensioning with regard to human safety 6.4.1 Permissible values for touch voltages 6.4.3 Basic design of earthing systems with regard to permissible touch voltage
47	7 Supports 7.3 Lattice steel towers 7.3.6 Ultimate limit states 7.3.6.1 General 7.3.6.3 Tension, bending and compression resistance of members 7.3.6.4 Buckling resistance of members in compression 7.3.7 Serviceability limit states 7.3.8 Resistance of connections 7.3.9 Design assisted by testing 7.4 Steel poles 7.4.6 Ultimate limit states (EN 1993-1-1:2005 – Chapter 6) 7.4.6.1 General 7.4.7 Serviceability limit states (EN 1993-1-1:2005 – Chapter 7)
48	7.4.8 Resistance of connections 7.4.8.1 Basis 7.4.8.2 Bolts (other than holding-down bolts) 7.4.8.3 Slip joint connections 7.4.9 Design assisted by testing 7.5 Wood poles 7.5.5 Ultimate limit states 7.5.5.1 Basis 7.5.6 Serviceability limit states 7.5.7 Resistance of connections 7.5.8 Design assisted by testing 7.6 Concrete poles 7.6.4 Ultimate limit states
49	7.6.5 Serviceability limit states 7.6.6 Design assisted by testing 7.7 Guyed structures 7.7.4 Ultimate limit states 7.7.4.1 Basis 7.7.4.4 Maximum slenderness 7.7.5 Serviceability limit states 7.9 Corrosion protection and finishes 7.9.1 General
50	7.10 Maintenance facilities 7.10.1 Climbing 7.10.2 Maintainability 7.10.3 Safety requirements 8 Foundations 8.1 Introduction 8.2 Basis of geotechnical design (EN 1997-1:2004 – Section 2) 8.2.2 Geotechnical design by calculation 8.3 Soil investigation and geotechnical data (EN 1997-1:2004 – Section 3)
51	9 Conductors and earth-wires 9.1 Introduction 9.2 Aluminium based conductors 9.2.2 Electrical requirements 9.2.3 Conductor service temperatures and grease characteristics
52	9.2.4 Mechanical requirements 9.2.5 Corrosion protection 9.2.6 Test requirements 9.3 Steel based conductors 9.3.1 Characteristics and dimensions
53	9.3.3 Conductor service temperatures and grease characteristics 9.3.4 Mechanical requirements 9.3.5 Corrosion protection 9.3.6 Test requirements
54	9.4 Copper base conductors 9.5 Conductors and ground wires containing optical fibre telecommunication circuits 9.5.1 Characteristics and dimensions 9.5.2 Electrical requirements 9.5.3 Conductor service temperatures 9.5.4 Mechanical requirements
55	9.6 General requirements 9.6.2 Partial factor for conductors 9.6.3 Minimum cross-sections 9.6.4 Sag – tension calculations 10 Insulators 10.1 Introduction 10.4 Pollution performance requirements 10.5 Power arc requirements 10.7 Mechanical requirements
56	10.10 Characteristics and dimensions of insulators 10.11 Type test requirements 10.11.1 Standard type tests 10.11.2 Optional type tests
57	11 Hardware 11.1 Introduction 11.6 Mechanical requirements
58	12 Quality assurance, checks and taking-over Annex H/SK (informative) Installation and measurements of earthing systems H.2 Basis for the verification H.2.2 Resistance to earth H.3 Installation of earth electrodes and earthing conductors H.3.1 Installation of earth conductors H.3.1.4 Jointing the earth conductors H.4 Measurements for and on earthing systems H.4.4 Determination of the earth potential rise H.4.5 Reduction factor related to earth wires of overhead lines H.4.5.2 Values of reduction factor of overhead lines
59	Annex M/SK (informative) Geotechnical and structural design of foundations M.1 Typical values of the geotechnical parameters of soils and rocks M.1.3 Symbols, definitions and units of some ground parameters
65	M.3 Sample semi-empirical models for resistance estimation M.3.1 Geotechnical design by calculation M.3.1.3 Slab foundations
66	Annex S/SK (informative) Map of icing zones in Slovakia

Status	Definitive
Pages	68
Publication Date	2016-12-31
ISBN	978 0 580 95801 4
Standard Number	BS EN 50341-2-23:2016
Title	Overhead electrical lines exceeding AC 1 kV – National Normative Aspects (NNA) for SLOVAKIA (based on EN 50341-1:2012)
Identical National Standard Of	EN 50341-2-23:2016
Replaces	BS EN 50341-3:2001, BS EN 50423-3:2005
Descriptors	Structural design, Electric power transmission, Electric power systems, Overhead contact lines, Overhead line conductors, Electric power transmission lines, Electric power distribution lines, Alternating-current power transmission, Overhead power lines, Loading, Alternating current, Power cables
Publisher	BSI
Committee	PEL/11
ICS Codes	29.240.20 - Power transmission and distribution lines


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