MADCAD.com - The Cloud-Based Reference Library

Not a subscriber? Register for a trial account.

Username:
Password:

Incorrect username/password.

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? *

⨯To continue with accurate pricing,
please select your company type below:

Large goverment organizations

Large multi-national corporation (more than $5B annual revenue)

None of the above

Your company has a special pricing case for IEEE.
For pricing, please contact us by filling out the form.

Full name*
Email*
Phone
Your selection

⨯We need your input!

Are you a code official in a jurisdiction with less than 300,000 population?

Yes No

This item is only available for the code officials of jurisdictions less then 300K population.

If you do not meet the criteria item will be removed and you will be able to continue shopping other items.

⨯ We need your input!

Your company has a special pricing case for ASME.
Please make sure the information you provide below is accurate.

Company Industry
Number Of Employees
Revenue

Pricing for the ASME publications in the store is for a 1-4 employee company in Construction Industry with revenue under $500,000.
If correct company info does not match what is publicly available info we will suspend the access and contact you for correction.
Please call 1-800-798-9296 if you have any questions.
If your company has more than 5,000 employee or more than 500 mil revenue please email us at info@madcad.com to receive a special quote, use "ASME Quote" on the subject line.

eLibrary > BS EN IEC 62305-2:2024 Protection against lightning - Risk management >

BS EN IEC 62305-2:2024 Protection against lightning - Risk management, 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 Symbols and abbreviated terms
5 Damage and loss [Go to Page]
5.1 Source of damage
5.2 Cause of damage
5.3 Type of loss
6 Risk and risk components [Go to Page]
6.1 Risk
6.2 Risk components [Go to Page]
6.2.1 Risk components for a structure due to source S1
Tables [Go to Page]
Table 1 – Sources of damage, causes of damage, types of loss and risk components according to the point of strike [Go to Page]
6.2.2 Risk component for a structure due to source S2
6.2.3 Risk components for a structure due to source S3
6.2.4 Risk component for a structure due to source S4
6.2.5 Factors affecting risk components for a structure
6.3 Composition of risk components [Go to Page]
6.3.1 Composition of risk components according to source of damage
Table 2 – Factors influencing the risk components [Go to Page]
6.3.2 Composition of risk components according to type of loss
7 Risk assessment [Go to Page]
7.1 Basic procedure
7.2 Structure to be considered for risk assessment
7.3 Procedure to evaluate the need of protection for risk R
8 Assessment of risk components [Go to Page]
8.1 Basic equation
Figures [Go to Page]
Figure 1 – Procedure for deciding the need for protection and for the selection of protection measures to reduce R ≤ RT
8.2 Assessment of risk components due to different sources of damage
Table 3 – Risk components for different sources of damage and types of loss
8.3 Partitioning of a structure in risk zones ZS
8.4 Partitioning of a line into sections SL
Figure 2 – Example of zone partitioning
8.5 Assessment of risk components in a zone of a structure with risk zones ZS [Go to Page]
8.5.1 General criteria
8.5.2 Single-zoned structure
8.5.3 Multi-zoned structure
9 Frequency of damage and its components [Go to Page]
9.1 Frequency of damage
9.2 Assessment of partial frequency of damage
9.3 Procedure to evaluate the need of protection for frequency of damage F
Table 4 – Partial frequency of damage for each source of damage
Figure 3 – Procedure for determining the need for protection and for the selection of protection measures
9.4 Assessment of partial frequency of damage in zones [Go to Page]
9.4.1 General criteria
9.4.2 Single-zoned structure
9.4.3 Multi-zoned structure
Annex A (informative) Assessment of annual number N of dangerous events [Go to Page]
A.1 General
A.2 Assessment of the average annual number of dangerous events ND due to flashes to a structure and NDJ to an adjacent structure [Go to Page]
A.2.1 Determination of the collection area AD
Figure A.1 – Collection area AD of an isolated structure
Figure A.2 – Complex-shaped structure [Go to Page]
A.2.2 Structure as a part of a building
Figure A.3 – Different methods to determine the collection area for a given structure
Figure A.4 – Structure to be considered for evaluation of collection area AD [Go to Page]
A.2.3 Relative location of the structure
A.2.4 Number of dangerous events ND for the structure
Table A.1 – Structure location factors CD and CDJ [Go to Page]
A.2.5 Number of dangerous events NDJ for an adjacent structure
A.3 Assessment of the average annual number of dangerous events NM due to flashes near a structure
A.4 Assessment of the average annual number of dangerous events NL due to flashes to a line
Table A.2 – Line installation factor CI
A.5 Assessment of average annual number of dangerous events NI due to flashes near a line
Table A.3 – Line type factor CT
Table A.4 – Environmental factor CE
A.6 Representation of the equivalent collection areas
Figure A.5 – Equivalent collection areas AD, ADJ, AM, AL and Al
Annex B (informative) Assessment of probability PX of damage [Go to Page]
B.1 General
B.2 Probability PAT that a flash to a structure will cause dangerous touch and step voltages
B.3 Probability PAD that a flash will cause damage to an exposed person on the structure
Table B.1 – Values of probability Pam that a flash to a structure will cause damage due to touch and step voltages according to different protection measures
Table B.2 – Reduction factor rt as a function of the type of surface of soil or floor
Table B.3 – Values of probability PLPS depending on the protection measures to protect the exposed areas of the structure against the direct flash and to reduce physical damage
B.4 Probability PB that a flash to a structure will cause physical damage by fire or explosion
Table B.4 – Values of probability PS that a flash to a structure will cause dangerous sparking
Table B.5 – Reduction factor rp as a function of provisions taken to reduce the consequences of fire
Table B.6 – Reduction factor rf as a function of risk of fire or explosion of structure
B.5 Probability PC that a flash to a structure will cause failure of internal systems
Table B.7 – Typical values of PSPD for SPDs on the low-voltage system, used to protect against sources of damage S1, S2, S3, S4
Table B.8 – Typical values of PSPD for SPDs on the telecommunications system used to protect against sources of damage S1, S2, S3, S4
Table B.9 – Values of factors CLD and CLI depending on shielding, grounding and isolation conditions
B.6 Probability PM that a flash near a structure will cause failure of internal systems
B.7 Probability PU that a flash to a line will cause damage due to touch voltage
Table B.10 – Value of factor KS3 depending on internal wiring
Table B.11 – Values of the probability PLD depending on the resistance RS of the cable screen and the impulse withstand voltage UW of the equipment
B.8 Probability PV that a flash to a line will cause physical damage by fire or explosion
Table B.12 – Values of the probability PLD depending on the resistance RS of the cable screen and the higher impulse withstand voltage UW of the equipment
Table B.13 – Typical values of probability PEB relevant to protection level LPL for which the SPD is designed to protect against source of damage S3
B.9 Probability PW that a flash to a line will cause failure of internal systems
B.10 Probability PZ that a lightning flash near an incoming line will cause failure of internal systems
B.11 Probability PP that a person will be in a dangerous place
B.12 Probability Pe that an equipment will be exposed to a damaging event
Annex C (informative) Assessment of loss LX [Go to Page]
C.1 General
C.2 Mean relative loss per dangerous event
Table C.1 – Loss values for each zone
Table C.2 – Typical mean values of LT, LD, LF1, LF2, LO1 and LO2
Annex D (informative) PSPD evaluation [Go to Page]
D.1 General
D.2 PQ values [Go to Page]
D.2.1 Probability values of both the negative and positive first strokes
D.2.2 Source of damage S1
D.2.3 Source of damage S3
Figure D.1 – Charge probability of both negative and positive first strokes [Go to Page]
D.2.4 Sources of damage S2 and S4
D.3 SPD protection level [Go to Page]
D.3.1 General
D.3.2 Source of damage S1
Figure D.2 – Probability PUp as a function of the SPD residual voltage Up’ at 1 kA
Figure D.3 – Probability PUp as a function of k1i
Table D.1 – PUp values of the voltage limiting SPD for combination between a voltage limiting and a voltage switching SPD
Figure D.4 – Probability PUp as a function of the SPD2 residual voltage Up’ at 1 kA [Go to Page]
D.3.3 Source of damage S3
Figure D.5 – Probability PUp as a function of the SPD2 residual voltage Up’ at 1 kA
Figure D.6 – Probability PUp as a function of the residual voltage at 1 kA (Up’)
Figure D.7 – Probability PUp as a function of different lengths of the internal circuit
Figure D.8 – Probability PUp as a function of different lengths of the internal circuit
Table D.2 – PUp values of the voltage limiting SPD [Go to Page]
D.3.4 Energy coordinated SPDs: One voltage switching SPD and one voltage limiting SPD downstream
Figure D.9 – Probability PUp as a function of the SPD2 residual voltage Up’ at 1 kA
Figure D.10 – Probability PUp as a function of the internal loop area for n' = 2 and w = 0,1 m
Figure D.11 – Probability PUp as a function of the internal loop area for n' = 2 and w = 0,5 m
Figure D.12 – Probability PUp as a function of the internal loop areafor n' = 20 and w = 0,1 m
D.4 Source of damage S4 [Go to Page]
D.4.1 One voltage limiting SPD
D.4.2 One voltage switching SPD
Figure D.13 – Probability PUp as a function of the SPD protection level Up’ at 1 kA for different internal loop areas
D.5 Source of damage S2
Figure D.14 – Probability PUp as a function of different internal loop areas for two typical protection levels of GDTs
Annex E (informative) Detailed investigation of additional losses LE related to surroundings [Go to Page]
E.1 General
E.2 Calculation of risk components
Table E.1 – Risk components for different sources of damage and types of loss, valid for damage to the surroundings
Table E.2 – Type of loss L1: Proposed typical values for the related time of presence for people tzE/8 760 in different environments as limited by Table E.3
Table E.3 – Type of loss L1: Typical mean values of LF1E and LO1E outside the structure
Table E.4 – Type of loss L2: Typical mean values of LF2E and LO2E outside the structure
Annex F (informative) Case studies [Go to Page]
F.1 General
F.2 House [Go to Page]
F.2.1 Relevant data and characteristics
Table F.1 – House: environment and structure characteristics
Table F.2 – House: power line [Go to Page]
F.2.2 Calculation of expected annual number of dangerous events
Table F.3 – House: telecom line
Table F.4 – House: equivalent collection areas of structure and lines [Go to Page]
F.2.3 Risk management
F.2.4 Definition of risk zones in the house
Table F.5 – House: expected annual number of dangerous events
Table F.6 – House: time of presence of persons and risk components into risk zones
Table F.7 – House: values for zone Z2 (inside the building) [Go to Page]
F.2.5 Risk assessment
F.2.6 Risk – Selection of protection measures
Table F.8 – House: risk for the unprotected structure (values × 10–5) [Go to Page]
F.2.7 Conclusions
F.3 Office building [Go to Page]
F.3.1 Relevant data and characteristics
Table F.9 – House: risk components for protected structure (values × 10–5)
Table F.10 – Office building: environment and structure characteristics [Go to Page]
F.3.2 Calculation of expected annual number of dangerous events
Table F.11 – Office building: power line
Table F.12 – Office building: telecom line [Go to Page]
F.3.3 Risk management
Table F.13 – Office building: collection areas of structure and lines
Table F.14 – Office building: expected annual number of dangerous events [Go to Page]
F.3.4 Definition of zones in the office building
Table F.15 – Office building: time of presence of persons and risk components in zones
Table F.16 – Office building: factors valid for zone Z1 (entrance area outside)
Table F.17 – Office building: factors valid for zone Z2 (roof)
Table F.18 – Office building: factors valid for zone Z3 (archive)
Table F.19 – Office building: factors valid for zone Z4 (offices) [Go to Page]
F.3.5 Risk assessment
Table F.20 – Office building: factors valid for zone Z5 (computer centre) [Go to Page]
F.3.6 Frequency of damage assessment
F.3.7 Risk – Selection of protection measures
Table F.21 – Office building: risk for the unprotected structure (values × 10–5)
Table F.22 – Office building: frequency of damage for the unprotected structure [Go to Page]
F.3.8 Frequency of damage – Selection of protection measures
Table F.23 – Risk components for protected structure (values × 10–5)
Table F.24 – Office building: frequency of damage for protected structure [Go to Page]
F.3.9 Conclusions
F.4 Hospital [Go to Page]
F.4.1 Relevant data and characteristics
Table F.25 – Hospital: environment and structure characteristics [Go to Page]
F.4.2 Calculation of expected annual number of dangerous events
Table F.26 – Hospital: power line
Table F.27 – Hospital: collection areas of structure and power line [Go to Page]
F.4.3 Risk management
F.4.4 Definition of zones in the hospital
Table F.28 – Hospital: expected annual number of dangerous events
Table F.29 – Hospital: time of presence of persons and risk components in zones
Table F.30 – Hospital: factors valid for zone Z1 (outside the building)
Table F.31 – Hospital: factors valid for zone Z2 (roof)
Table F.32 – Hospital: factors valid for zone Z3 (rooms)
Table F.33 – Hospital: factors valid for zone Z4 (operating block) [Go to Page]
F.4.5 Risk assessment
Table F.34 – Hospital: factors valid for zone Z5 (intensive care unit) [Go to Page]
F.4.6 Frequency of damage assessment
F.4.7 Risk – Selection of protection measures
Table F.35 – Hospital: risk for the unprotected structure (values × 10–5)
Table F.36 – Hospital: frequency of damage for the unprotected structure
Table F.37 – Hospital: risk for the protected structure (values × 10–5) [Go to Page]
F.4.8 Frequency of damage – Selection of protection measures
F.4.9 Conclusions
Table F.38 – Hospital: frequency of damage for the protected structure
Bibliography
Annex NB (informative) Assessment of probability PX of damage [Go to Page]
NB.1 General
NB.2 Probability PAT that a flash to a structure will cause dangerous touch and step voltages
NB. 3 Probability PAD that a flash will cause damage to an exposed person on the structure
NB.4 Probability PB that a flash to a structure will cause physical damage by fire or explosion
NB.5 Probability PC that a flash to a structure will cause failure of internal systems
NB.6 Probability PM that a flash near a structure will cause failure of internal systems
NB.7 Probability PU that a flash to a line will cause damage due to touch voltage
NB.8 Probability PV that a flash to a line will cause physical damage by fire or explosion
NB.9 Probability PW that a flash to a line will cause failure of internal systems
NB.10 Probability PZ that a lightning flash near an incoming line will cause failure of internal systems
NB.11 Probability PP that a person will be in a dangerous place
NB.12 Probability Pe that an equipment will be exposed to a damaging event
Annex NC (informative) Assessment of loss LX [Go to Page]
NC.1 General
NC.2 Mean relative loss per dangerous event
Annex NG (informative) UK Ground Strike Density Maps [Go to Page]
NG.1 General
NG.2 South
NG.3 North [Go to Page]

MADCAD.com Free Trial

Report To Us

Contact us for a custom quote

⨯To continue with accurate pricing,
please select your company type below:

⨯We need your input!

⨯ We need your input!

⨯We need your input!

⨯We need your input!

Cart Warning

BS EN IEC 62305-2:2024 Protection against lightning - Risk management, 2025

MADCAD.com Free Trial

Report To Us

Contact us for a custom quote

⨯To continue with accurate pricing, please select your company type below:

⨯We need your input!

⨯ We need your input!

⨯We need your input!

⨯We need your input!

Cart Warning

BS EN IEC 62305-2:2024 Protection against lightning - Risk management, 2025

⨯To continue with accurate pricing,
please select your company type below: