Cart (0)
- No items in cart.
Total
$0
There is a technical issue about last added item. You can click "Report to us" button to let us know and we resolve the issue and return back to you or you can continue without last item via click to continue button.
Not a subscriber? Register for a trial account.
Already a subscriber? 
MADCAD.com Free Trial
Sign up for a 3 day free trial to explore the MADCAD.com interface, PLUS access the
2009 International Building Code to see how it all works.
If you like to setup a quick demo, let us know at support@madcad.com
or +1 800.798.9296 and we will be happy to schedule a webinar for you.
| Email * | |
| Password * | |
| Confirm * | |
| First Name * | |
| Last Name * | |
| Title | |
| Company Name * | |
| Company Size * | |
| Industry * | |
| Address * | |
| Address 2 | |
| City * | |
| State * |
Zip *
|
| Country * | |
| Phone * | |
| How did you hear about MADCAD.com? * |
|
Reset password
Enter your personal account email address to request
a password reset:
a password reset:
Reset password
Enter your account email address to request
a password reset:
a password reset:
Security check
Please login to your authorized staff account to use this feature.
Are you sure you want to empty the cart?
Report To Us
Contact us for a custom quote
⨯To continue with accurate pricing,
please select your company type below:
⨯We need your input!
Are you a code official in a jurisdiction with less than 300,000 population?
⨯ We need your input!
⨯We need your input!
Are you an existing Madcad user?
If so, please login to continue with the free items in your cart.
⨯We need your input!
This bundle includes subscribed items.
eLibrary >
BS EN IEC 62305-4:2024 Protection against lightning - Electrical and electronic systems within structures >
BS EN IEC 62305-4:2024 Protection against lightning - Electrical and electronic systems within structures, 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 Design and installation of SPM [Go to Page]
- 4.1 General
- Figures [Go to Page]
- Figure 1 – General principle for the division into different LPZs
- Figure 2 – Examples of possible SPM (LEMP protection measures)
- 4.2 Design of SPM
- 4.3 Lightning protection zones (LPZs) [Go to Page]
- 4.3.1 General
- 4.3.2 Outer zones
- 4.3.3 Inner zones
- Figure 3 – Examples of interconnected LPZs
- 4.4 Basic SPM
- Figure 4 – Examples of extended lightning protection zones
- 5 Earthing and bonding networks [Go to Page]
- 5.1 General
- 5.2 Earth-termination system
- Figure 5 – Example of a three-dimensional earthing system consisting of the bonding network interconnected with the earth-termination system
- 5.3 Bonding network
- Figure 6 – Meshed earth-termination system of a plant
- Figure 7 – Utilization of reinforcing rods of a structure as a protection measure against LEMP and for equipotential bonding
- Figure 8 – Equipotential bonding in a structure with steel reinforcement
- Figure 9 – Integration of conductive parts of internal systems intothe bonding network
- 5.4 Bonding bars
- Figure 10 – Combinations of integration methods of conductive parts of internal systems into the bonding network
- 5.5 Bonding at the boundary of an LPZ
- 5.6 Material and dimensions of bonding components
- 6 Magnetic shielding and line routing [Go to Page]
- 6.1 General
- 6.2 Spatial shielding
- 6.3 Shielding of internal lines
- Tables [Go to Page]
- Table 1 – Minimum cross-sections for bonding components
- 6.4 Routing of internal lines
- 6.5 Shielding of external lines
- 6.6 Material and dimensions of magnetic shields
- 7 Coordinated SPD system
- 8 Isolating interfaces
- 9 SPM management [Go to Page]
- 9.1 General
- 9.2 SPM management plan
- Table 2 – SPM management plan for new buildings and for extensive changes in construction or use of existing buildings
- 9.3 Inspection of SPM [Go to Page]
- 9.3.1 General
- 9.3.2 Inspection procedure
- 9.3.3 Inspection documentation
- 9.4 Maintenance
- Annex A (informative) Basis of electromagnetic environment evaluation in an LPZ [Go to Page]
- A.1 General
- A.2 Damaging effects on electrical and electronic systems due to lightning [Go to Page]
- A.2.1 Sources of damage
- A.2.2 Object of damage
- A.2.3 Withstand of equipment signal ports
- A.2.4 Withstand of equipment power ports
- Table A.1 – Rated impulse voltage of equipment per IEC 60364-4-44:2007, Clause 443 and IEC 60364-4-44:2007/AMD1:2015, Clause 443 [Go to Page]
- A.2.5 Relationship between the object of damage and the source of damage
- A.3 Spatial shielding, line routing and line shielding [Go to Page]
- A.3.1 General
- Figure A.1 – LEMP situation due to lightning strike to the structure
- Table A.2 – Parameters relevant to source of harm and equipment [Go to Page]
- A.3.2 Grid-like spatial shields
- Figure A.2 – Simulation of the rise of the field of the subsequent stroke (0,25/100 µs) by damped 1 MHz oscillations (multiple impulses 0,2/0,5 µs)
- Figure A.3 – Large volume shield built by metal reinforcement and metal frames [Go to Page]
- A.3.3 Line routing and line shielding
- Figure A.4 – Volume for electrical and electronic systems inside an inner LPZ n
- Figure A.5 – Reducing induction effects by line routing and shielding measures
- Figure A.6 – Example of SPM for an office building
- A.4 Magnetic field inside LPZ [Go to Page]
- A.4.1 Approximation for the magnetic field inside LPZ
- Figure A.7 – Evaluation of the magnetic field values in case of a direct lightning strike
- Figure A.8 – Evaluation of the magnetic field values in case of a nearby lightning strike
- Table A.3 – Examples for I0/MAX = 100 kA and wm = 2 m
- Table A.4 – Attenuation of the magnetic field of grid-like spatial shields for a plane wave
- Figure A.9 – Distance sa depending on rolling sphere radius and structure dimensions
- Table A.5 – Rolling sphere radius corresponding to maximum lightning current [Go to Page]
- A.4.2 Numerical magnetic field calculation in case of direct lightning strikes
- Table A.6 – Examples for I0/MAX = 100 kA and wm = 2 m corresponding to SF = 12,6 dB
- Figure A.10 – Types of structure geometries with different volume shields
- Figure A.11 – Magnetic field strength H1/MAX inside a grid-like shield for the cubic structure shown in Figure A.10 [14]
- Figure A.12 – Magnetic field strength H1/MAX inside a grid-like shield for the cubic structure according to mesh width [Go to Page]
- A.4.3 Experimental evaluation of the magnetic field due to a direct lightning strike
- Figure A.13 – Low-level test to evaluate the magnetic field inside a shielded structure
- A.5 Calculation of induced voltages and currents [Go to Page]
- A.5.1 General
- A.5.2 Situation inside LPZ 1 in the case of a direct lightning strike
- Figure A.14 – Voltages and currents induced into a loop formed by lines [Go to Page]
- A.5.3 Situation inside LPZ 1 in the case of a nearby lightning strike
- A.5.4 Situation inside LPZ 2 and higher
- Annex B (informative) Implementation of SPM for an existing structure [Go to Page]
- B.1 General
- B.2 Checklists
- Table B.1 – Structural characteristics and surroundings
- B.3 Design of SPM for an existing structure
- Table B.2 – Installation characteristics
- Table B.3 – Equipment characteristics
- Table B.4 – Other questions to be considered for the protection concept
- Table B.5 – Type of LPS
- B.4 Design of basic protection measures for LPZs [Go to Page]
- B.4.1 Design of basic protection measures for LPZ 1
- B.4.2 Design of basic protection measures for LPZ 2
- Figure B.1 – SPM design steps for an existing structure [Go to Page]
- B.4.3 Design of basic protection measures for LPZ 3
- B.5 Improvement of an existing LPS using spatial shielding of LPZ 1
- B.6 Establishment of LPZs for electrical and electronic systems
- Figure B.2 – Methods of establishing LPZs in existing structures
- B.7 Protection using a bonding network
- B.8 Protection by surge protective devices
- B.9 Protection by isolating interfaces
- B.10 Protection measures by line routing and shielding
- Figure B.3 – Reduction of loop area using shielded cables close to a metal plate
- Figure B.4 – Example of a metal plate for additional shielding
- B.11 Protection measures for externally installed equipment [Go to Page]
- B.11.1 General
- B.11.2 Protection of external equipment
- Figure B.5 – Protection of aerials and other external equipment [Go to Page]
- B.11.3 Protection by maintaining electrical insulation to the LPS
- Figure B.6 – Separation distance maintained or not maintained [Go to Page]
- B.11.4 Reduction of overvoltages in cables
- Figure B.7 – Inherent shielding provided by bonded ladders and pipes
- Figure B.8 – Ideal positions for lines on a mast (cross-section of steel lattice mast)
- B.12 Improving interconnections between structures [Go to Page]
- B.12.1 General
- B.12.2 Isolating lines
- B.12.3 Metallic lines
- B.13 Integration of new internal systems into existing structures
- B.14 Overview of possible protection measures [Go to Page]
- B.14.1 Power supply
- Figure B.9 – Upgrading of the SPM in existing structures [Go to Page]
- B.14.2 Surge protective devices
- B.14.3 Isolating interfaces
- B.14.4 Line routing and shielding
- B.14.5 Spatial shielding
- B.14.6 Bonding
- B.15 Upgrading a power supply and cable installation inside the structure
- Annex C (informative) Selection and installation of a coordinated SPD system [Go to Page]
- C.1 General
- C.2 Selection of SPDs [Go to Page]
- C.2.1 Location of SPDs according to source of damage
- C.2.2 Selection with regard to lightning current I
- Figure C.1 – Selection of SPDs by source of damage [Go to Page]
- C.2.3 Selection with regard to voltage protection level Up
- Table C.1 – Required rated impulse voltage of equipment
- Figure C.2 – Example of installation of an SPD to reduce the effect of SPD lead length
- Figure C.3 – Surge voltage between live conductor and bonding bar [Go to Page]
- C.2.4 SPD arrangements
- C.2.5 Equipment protection by two SPDs
- C.2.6 Equipment connected to two different services
- C.2.7 Selection with regard to location and discharge current
- Figure C.4 – Equipment with two ports and SPDs on both services bonded to two different earthing points of a non-equipotential earthing system
- Table C.2 – Connection of the SPD dependent on supply system
- Table C.3 – Selection of impulse discharge current (Iimp) where the building is protected against direct lightning strike (S1) based on simplified rules
- Table C.4 – Nominal discharge current (In) in kA depending on supply system and connection type [Go to Page]
- C.2.8 Coordination of the SPD with back-up overcurrent protective device (OCPD)
- Table C.5 – Selection of impulse discharge current (Iimp) where the building is protected from direct strikes to the line (S3)
- C.3 Installation of a coordinated SPD system [Go to Page]
- C.3.1 General
- C.3.2 Installation location of SPDs
- C.3.3 Connecting conductors
- C.3.4 Coordination of SPDs
- C.3.5 Procedure for installation of a coordinated SPD system
- Annex D (informative) Factors to be considered in the selection of SPDs [Go to Page]
- D.1 General
- D.2 Factors determining the stress experienced by an SPD
- Table D.1 – Preferred values of Iimp
- Figure D.1 – Installation example of SPD test class I, class II and class III in a TN system
- D.3 Quantifying the statistical threat level to an SPD [Go to Page]
- D.3.1 General
- D.3.2 Installation factors effecting current distribution
- Figure D.2 – Basic example of different sources of damage to a structure and lightning current distribution within a system [Go to Page]
- D.3.3 Considerations in the selection of SPD ratings: Iimp, [Imax], In, UOC
- Figure D.3 – Example of the simplified current distribution in a TN power distribution system
- Annex E (informative) Lightning current sharing using simulation modelling [Go to Page]
- E.1 General [Go to Page]
- E.1.1 Overview
- E.1.2 Methods to determine the lightning current distribution
- E.2 Lightning current parameters for SPDs [Go to Page]
- E.2.1 Lightning current parameters in accordance with IEC 62305-1
- E.2.2 Conclusion on lightning current sharing from numerical modelling
- Figure E.1 – Approach to computer simulation used to analyse lightning current sharing
- E.3 Distribution of lightning currents in power supply systems [Go to Page]
- E.3.1 Influencing factors
- Table E.1 – General trends associated with protection installations for different power distribution systems [Go to Page]
- E.3.2 Considerations in lightning current sharing using numerical modelling
- Figure E.2 – MEN earthing system
- Figure E.3 – Parallel connected structures
- Figure E.4 – Influence of lightning current flow in parallel connected structures
- Figure E.5 – Influence of lightning current flow in star connected structures
- Figure E.6 – Influence of other metallic conductive services onlightning current sharing
- E.4 Current distribution in structures [Go to Page]
- E.4.1 General
- Figure E.7 – Influence of lightning current flow from S3 events [Go to Page]
- E.4.2 Structures with externally installed equipment and non-isolated LPS
- Figure E.8 – Structures with externally installed equipment and non-isolated LPS [Go to Page]
- E.4.3 Tall buildings
- E.4.4 Transformer located inside a structure
- Figure E.9 – Protection of internally located sub-station transformers
- Annex F (informative) Lightning current sharing in photovoltaic installations [Go to Page]
- F.1 General
- Figure F.1 – Current sharing between LPS down conductors and the internal cabling of a PV system in which the separation distance s has not been maintained
- F.2 Structures with roof-mounted PV systems [Go to Page]
- F.2.1 Description and assumptions
- F.2.2 Simplified calculation for the lightning current flowing in DC conductors
- Figure F.2 – Protection of a roof-mounted PV system
- Table F.1 – Simplified calculated values of Iimp (I10/350) and In (I8/20) for voltage-limiting SPDs on the DC side of a PV installation mounted on the roof of a building with an external LPS if the separation distance is not maintained (see Figure F.1)
- F.3 Outside free-field power plant with a non-isolated LPS [Go to Page]
- F.3.1 General
- Table F.2 – Simplified calculated values of Iimp (I10/350) for voltage switching SPDs on the DC side of a PV installation mounted on the roof of a building with an external LPS if the separation distance is not maintained (see Figure F.1) [Go to Page]
- F.3.2 Finding the lightning current flowing through the DC conductor via the SPD
- F.3.3 Results
- Figure F.3 – Free-field PV power plant with multiple earthing and meshed earthing system
- Table F.3 – Simplified calculated values of I10/350 and I8/20 for SPDs intended to be used in free-field PV power plants with multiple earthing and a meshed earthing system based on Figure F.3
- Annex G (informative) Testing system level behaviour under lightning discharge conditions [Go to Page]
- G.1 General
- G.2 SPD discharge current test under normal service conditions
- G.3 Induction test due to lightning currents
- G.4 Recommended test classification of system level immunity (IEC 61000-4-5)
- Figure G.1 – Example circuit of an SPD discharge current test under service conditions
- Figure G.2 – Example circuit of an induction test due to lightning currents
- Annex H (informative) Induced voltage in the circuits protected by an SPD [Go to Page]
- H.1 General
- H.2 Direct flashes to the structure (Figure H.1)
- H.3 Flashes near the structure (Figure H.2)
- Figure H.1 – Induced loop by a lightning current on the structure
- Figure H.2 – Induced loop by a lightning current near the structure
- H.4 Flashes to the service
- Table H.1 – Flashes near the structure: induced voltage per square metre q as a function of LPL
- Table H.2 – Values of kc
- Table H.3 – Values of kS1 and kS2 for some copper shields
- Annex I (informative) Isolation interfaces using surge isolation transformers (SITs) [Go to Page]
- I.1 SIT for low-voltage power distribution system
- I.2 SIT for communication systems
- I.3 SIT surge mitigation performance (low-voltage power distribution systems)
- Figure I.1 – Use of SPDs to protect windings of SIT
- Bibliography [Go to Page]
Copyright 2025 Compu-tecture, Inc.
All Rights Reserved.
About Us /
Careers /
support@madcad.com /
1.800.798.9296