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BSI 23/30479272 DC 2023

BSI 23/30479272 DC 2023

$24.66

BS EN IEC 62305-2. Protection against lightning – Part 2. Risk management

Published By Publication Date Number of Pages
BSI 2023 125
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PDF Catalog

PDF Pages PDF Title
10 FOREWORD
12 INTRODUCTION
14 Scope
Normative references
Terms and definitions
22 Symbol and abbreviations
26 Damage and loss
5.1 Source of damage
5.2 Cause of damage
5.3 Type of loss
27 Risk and risk components
6.1 Risk
28 6.2 Risk components
6.2.1 Risk components for a structure due to source S1
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
29 6.3 Composition of risk components
6.3.1 Composition of risk components according to source of damage
30 6.3.2 Composition of risk components according to type of loss
31 Risk assessment
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
34 Assessment of risk components
8.1 Basic equation
8.2 Assessment of risk components due to different sources of damage
36 8.3 Partitioning of a structure in risk zones ZS
37 8.4 Partitioning of a line into sections SL
8.5 Assessment of risk components in a zone of a structure with risk zones ZS
8.5.1 General criteria
8.5.2 Single-zoned structure
38 8.5.3 Multi-zoned structure
Frequency of damage and its components
9.1 Frequency of damage
9.2 Assessment of partial frequency of damage
39 9.3 Procedure to evaluate the need of protection for frequency of damage F
42 9.4 Assessment of partial frequency of damage
9.4.1 General criteria
9.4.2 Single-zoned structure
9.4.3 Multi-zoned structure
43 Annex A (informative) Assessment of annual number N of dangerous events
A.1 General
44 A.2 Assessment of the average annual number of dangerous events ND due to flashes to a structure and NDJ to an adjacent structure
A.2.1 Determination of the collection area AD
A.2.1.1 Rectangular structure
A.2.1.2 Complex-shaped structure
46 A.2.2 Structure as a part of a building
47 A.2.3 Relative location of the structure
48 A.2.4 Number of dangerous events ND for the structure
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
49 A.4 Assessment of the average annual number of dangerous events NL due to flashes to a line
50 A.5 Assessment of average annual number of dangerous events NI due to flashes near a line
51 A.6 Representation of the equivalent collection areas
52 Annex B (informative) Assessment of probability PX of damage
B.1 General
53 B.2 Probability PAT that a flash to a structure will cause dangerous touch and step voltage
54 B.3 Probability PAD that a flash will cause damage to an exposed person on the structure.
55 B.4 Probability PB that a flash to a structure will cause physical damage by fire or explosion
57 B.5 Probability PC that a flash to a structure will cause failure of internal systems
62 B.6 Probability PM that a flash near a structure will cause failure of internal systems
64 B.7 Probability PU that a flash to a line will cause damage due to touch voltage
66 B.8 Probability PV that a flash to a line will cause physical damage by fire or explosion
67 B.9 Probability PW that a flash to a line will cause failure of internal systems
68 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
69 Annex C (informative) Assessment of loss LX
C.1 General
C.2 Mean relative loss per dangerous event
72 Annex D (informative) PSPD Evaluation
D.1 Introduction
D.2 PQ values
D.2.1 Probability values of both the negative and positive first strokes
73 D.2.2 Source of damage S1
D.2.3 Source of damage S3
74 D.2.4 Sources of damage S2 and S4
D.3 SPD protection level
D.3.1 Source of damage S1
D.3.1.1 One voltage limiting SPD
75 D.3.1.2 One voltage switching SPD
76 D.3.1.3 Combination of voltage limiting SPD and voltage switching SPD
77 D.3.1.4 Two voltage limiting SPDs
D.3.1.5 Two SPDs: one voltage switching SPD and one voltage limiting SPD
78 D.3.2 Source of damage S3
D.3.2.1 One voltage limiting SPD
79 D.3.2.2 One voltage switching SPD
81 D.3.2.3 Limiting type SPD and voltage switching SPD
82 D.3.2.4 Two voltage limiting SPDs
83 D.3.3 Energy coordinated SPDs: One voltage switching SPD and one voltage limiting SPD downstream
86 D.4 Source of damage S4
D.4.1 One voltage limiting SPD
D.4.2 One voltage switching SPD
87 D.5 Source of damage S2
88 Annex E (informative) Detailed investigation of additional losses LE related to surroundings
E.1 General
E.2 Calculation of risk components
92 Annex F (informative) Case study
F.1 General
F.2 House
F.2.1 Relevant data and characteristics
95 F.2.2 Calculation of expected annual number of dangerous events
96 F.2.3 Risk management
F.2.4 Definition of risk zones in the House
98 F.2.5 Risk assessment
99 F.2.6 Risk – Selection of protection measures
F.2.7 Conclusions
100 F.3 Office building
F.3.1 Relevant data and characteristics
101 F.3.2 Calculation of expected annual number of dangerous events
102 F.3.3 Risk management
103 F.3.4 Definition of zones in the office building
108 F.3.5 Risk assessment
109 F.3.6 Frequency of damage assessment
F.3.7 Risk – Selection of protection measures
110 F.3.8 Frequency of damage – Selection of protection measures
111 F.3.9 Conclusions
112 F.4 Hospital
F.4.1 Relevant data and characteristics
113 F.4.2 Calculation of expected annual number of dangerous events
114 F.4.3 Risk management
F.4.4 Definition of zones in the hospital
120 F.4.5 Risk assessment
121 F.4.6 Frequency of damage assessment
F.4.7 Risk – Selection of protection measures
123 F.4.8 Frequency of damage – Selection of protection measures
124 F.4.9 Conclusions
125 Bibliography

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BSI 23/30479272 DC 2023
$24.66