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eLibrary >
BS EN IEC 62305-3:2024 Protection against lightning - Physical damage to structures and life hazard >
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BS EN IEC 62305-3:2024 Protection against lightning - Physical damage to structures and life hazard, 2025
- undefined
- Annex ZA (normative)Normative references to international publicationswith their corresponding European publications [Go to Page]
- English [Go to Page]
- CONTENTS
- FOREWORD
- INTRODUCTION
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Lightning protection system (LPS) [Go to Page]
- 4.1 Class of LPS
- Tables [Go to Page]
- Table 1 – Relation between lightning protection levels (LPL) and class of LPS (see IEC 62305-1)
- 4.2 Design of the LPS
- 5 External lightning protection system [Go to Page]
- 5.1 General [Go to Page]
- 5.1.1 Application of an external LPS
- 5.1.2 Application of an isolated LPS or an electrically insulated LPS
- 5.1.3 Use of natural components
- 5.2 Air-termination systems [Go to Page]
- 5.2.1 General
- 5.2.2 Positioning
- Table 2 – Values of rolling sphere radius, mesh size and protection angle corresponding to the class of LPS
- Figures [Go to Page]
- Figure 1 – Protection angle corresponding to the class of LPS
- Figure 2 – Contacting the rolling sphere with the structure to be protected
- Figure 3 – Application of the protection angle method [Go to Page]
- 5.2.3 Air terminations against flashes to the side of tall structures
- 5.2.4 Construction
- 5.2.5 Natural components
- Table 3 – Minimum thickness of metal sheets or metal pipes in air-termination systems
- Table 4 – Maximum temperature rises ∆T (K) of inner surface and time duration t50 (s) for different thickness t’’ (mm) and long strokes according to LPL I (QLONG = 200 C)
- 5.3 Down-conductor systems [Go to Page]
- 5.3.1 General
- 5.3.2 Positioning of an isolated LPS
- 5.3.3 Positioning of an attached LPS
- 5.3.4 Construction
- Table 5 – Preferred values of the distance between down conductors by LPS according to the class of LPS
- Figure 4 – Loop in a down conductor [Go to Page]
- 5.3.5 Natural components
- 5.3.6 Test joints and test points
- 5.4 Earth-termination system [Go to Page]
- 5.4.1 General
- 5.4.2 Earthing arrangement in general conditions
- Figure 5 – Minimum length l1 of each earth electrode according to the class of LPS [Go to Page]
- 5.4.3 Installation of earth electrodes
- 5.4.4 Natural earth electrodes
- 5.5 Components [Go to Page]
- 5.5.1 General
- 5.5.2 Fixing
- Table 6 – LPS materials and conditions of usea [Go to Page]
- 5.5.3 Connections
- 5.5.4 Components of an electrically insulated LPS
- 5.6 Materials and dimensions [Go to Page]
- 5.6.1 Materials
- 5.6.2 Dimensions
- Table 7 – Material, configuration and minimum cross-sectional area of air-termination conductors, air-termination rods, earth lead-in conductors and down conductors
- Table 8 – Material, configuration and minimum dimensions of earth electrodes
- 6 Internal lightning protection system [Go to Page]
- 6.1 General
- 6.2 Lightning equipotential bonding [Go to Page]
- 6.2.1 General
- 6.2.2 Lightning equipotential bonding for metal installations
- Table 9 – Minimum dimensions of conductors connecting different bonding bars or connecting bonding bars to the earth-termination system
- Table 10 – Minimum dimensions of conductors connecting internal metal installations to the bonding bar [Go to Page]
- 6.2.3 Lightning equipotential bonding for external conductive parts
- 6.2.4 Lightning equipotential bonding for internal systems
- 6.2.5 Lightning equipotential bonding for lines connected to the structure to be protected
- 6.3 Separation distance [Go to Page]
- 6.3.1 General approach
- Table 11 – Separation distance – Values of coefficient ki
- Table 12 – Separation distance – Values of coefficient km [Go to Page]
- 6.3.2 Simplified approach
- 7 Maintenance and inspection of an LPS [Go to Page]
- 7.1 General
- 7.2 Maintenance
- 7.3 Objective of inspections
- Table 13 – Separation distance – Approximated values of coefficient kc
- 7.4 Need for inspection
- 8 Protection measures against injury to human beings due to touch and step voltages [Go to Page]
- 8.1 Protection measures against touch voltages
- 8.2 Protection measures against step voltages
- Annex A (normative) Minimum cross-section of the entering cable screen to avoid dangerous sparking [Go to Page]
- Table A.1 – Cable length to be considered according to the condition of the screen
- Annex B (informative) Evaluation of the separation distance s [Go to Page]
- Figure B.1 – Values of coefficient kc in the case of a wire air-termination system
- Figure B.2 – Values of coefficient kc in the case of a multiple down-conductor system
- Figure B.3 – Values of coefficients kc in the case of multiple down conductors with an interconnecting ring of down conductors at each level
- Figure B.4 – Values of coefficient kc in the case of a meshed air-termination system, with a multiple down-conductor system
- Annex C (normative) Additional requirements for LPSs in the case of structures with a risk of explosion [Go to Page]
- C.1 General
- C.2 Basic requirements [Go to Page]
- C.2.1 General
- C.2.2 Required information
- C.2.3 Earthing
- C.3 Structures containing solid explosive material
- C.4 Structures with hazardous areas [Go to Page]
- C.4.1 General
- C.4.2 Structures with Zones 2 and 22
- C.4.3 Structures with Zones 1 and 21
- C.4.4 Structures with Zones 0 and 20
- C.4.5 Specific applications
- C.5 Maintenance and inspection
- Annex D (informative) Explanatory text concerning the design, construction, maintenance and inspection of lightning protection systems [Go to Page]
- D.1 General
- D.2 Structure of Annex D
- D.3 Additional information
- D.4 Design of lightning protection systems (LPSs) [Go to Page]
- D.4.1 General remarks
- Figure D.1 – LPS design flow diagram [Go to Page]
- D.4.2 Design of the LPS
- D.5 External lightning protection system [Go to Page]
- D.5.1 General
- D.5.2 Air-termination systems
- Figure D.2 – Space protected by two parallel air-termination horizontal wires or two air-termination rods (r > d/2)
- Figure D.3 – Designing the protection volume of catenary wire
- Figure D.4 – Horizontal section of the protected area at a given height
- Figure D.5 – Three examples of design of attached LPS air termination according to the mesh method air-termination design
- Figure D.6 – Lateral protected volume constructed from the rolling sphere and the lateral protection angle methods near the height equal to the radius of the sphere
- Figure D.7 – Application of the protection angle method for lateral impact with heights up to 60 m
- Table D.1 – Suggested fixing centres
- Figure D.8 – Air termination and visually concealed conductors for buildings less than 20 m high with sloping roofs
- Figure D.9 – Construction of an LPS using natural components on the roof of the structure
- Figure D.10 – Positioning of the external LPS on a structure made of insulating material (e.g. wood or bricks) with a height up to 60 m with flat roof and with roof fixtures
- Figure D.11 – Connection of natural air-termination rod to air-termination conductor
- Figure D.12 – Construction of the bridging between the segments of the metallic facade plates
- Figure D.13 – Air-termination rod used for protection of a metallic roof fixture with electric power installations which are not bonded to the air-termination system
- Figure D.14 – Method of achieving electrical continuity on metallic parapet capping
- Figure D.15 – Examples of air termination for a house with an antenna using an attached LPS [Go to Page]
- D.5.3 Down-conductor systems
- Figure D.16 – Installation of external LPS on a structure of insulating material with different roof levels
- Figure D.17 – LPS design for a cantilevered part of a structure
- Figure D.18 – Use of a metallic facade covering as a natural down-conductor system on a structure of steel-reinforced concrete
- Figure D.19 – Use of metallic facade as natural down-conductor system and connection of facade supports
- Figure D.20 – Connection of the continuous strip windows to a metal facade covering
- Figure D.21 – Measuring the overall electrical resistance of steel reinforcement
- Figure D.22 – Equipotential bonding in a structure with a steel reinforcement
- Figure D.23 – Typical methods of joining reinforcing rods in concrete (where permitted)
- Figure D.24 – Examples of clamps used as joints between reinforcing rods and conductors
- Figure D.25 – Examples of connection points to the reinforcement in a reinforced concrete wall
- Figure D.26 – Internal down conductors in industrial structures
- Figure D.27 – Installation of bonding conductors on plate-like prefabricated reinforced concrete parts by means of bolted or welded conductor links
- Figure D.28 – Installation of bonding conductors in reinforced concrete structures and flexible bonds between two reinforced concrete parts [Go to Page]
- D.5.4 Earth-termination systems
- Figure D.29 – Combined foundation earth electrode
- Figure D.30 – Construction of foundation earth ring for structures of different foundation design
- Figure D.31 – Example of a Type A earthing arrangement with a vertical conductor type electrode
- Figure D.32 – Example of a Type A earthing arrangement with a vertical rod type electrode [Go to Page]
- D.5.5 Components
- D.5.6 Materials and dimensions
- Figure D.33 – Meshed earth-termination system of a plant
- D.6 Internal lightning protection system [Go to Page]
- D.6.1 General
- D.6.2 Lightning equipotential bonding (EB)
- Figure D.34 – Example of an equipotential bonding arrangement
- Figure D.35 – Example of bonding arrangement in a structure with multiple entry points of external conductive parts using a ring electrode for interconnection of bonding bars
- Figure D.36 – Example of bonding in the case of multiple entry points of external conductive parts and an electric power or communication line, using an internal ring conductor for interconnection of the bonding bars
- Figure D.37 – Example of bonding arrangement in a structure with multiple entry points of external conductive parts entering the structure above ground level [Go to Page]
- D.6.3 Electrical isolation of the external LPS
- Figure D.38 – Directions for calculations of the separation distance, s, for a worse case lightning interception point at a distance, l, from the reference point according to 6.3 [Go to Page]
- D.6.4 Protection against effects of induced currents in internal systems
- D.7 Maintenance and inspection of the LPS [Go to Page]
- D.7.1 General
- D.7.2 Inspection
- D.7.3 Testing
- D.7.4 Maintenance
- Bibliography [Go to Page]
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