EN 62305-2:2012

SLOVENSKI STANDARD
01-julij-2012
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SIST EN 62305-2:2006
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Protection against lightning - Part 2: Risk management
Blitzschutz - Teil 2: Risiko-Management
Protection contre la foudre - Partie 2: Evaluation des risques
Ta slovenski standard je istoveten z: EN 62305-2:2012
ICS:
91.120.40 =DãþLWDSUHGVWUHOR Lightning protection
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 62305-2
NORME EUROPÉENNE
May 2012
EUROPÄISCHE NORM
ICS 29.020; 91.120.40 Supersedes EN 62305-2:2006 + corr. Nov.2006

English version
Protection against lightning -
Part 2: Risk management
(IEC 62305-2:2010, modified)
Protection contre la foudre -  Blitzschutz -
Partie 2: Evaluation des risques Teil 2: Risiko-Management
(CEI 62305-2:2010, modifiée) (IEC 62305-2:2010, modifiziert)

This European Standard was approved by CENELEC on 2012-03-19. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62305-2:2012 E
Contents
For e wor d . 6
Introduction . 7
1 Scope . 8
2 Normative references . 8
3 Terms, definitions, symbols and abbreviations . 8
3.1 Terms and definitions . 8
3.2 Symbols and abbreviations . 13
4 Explanation of terms . 16
4.1 Damage and loss . 16
4.2 Risk and risk components . 18
4.3 Composition of risk components . 20
5 Risk management . 21
5.1 Basic procedure . 21
5.2 Structure to be considered for risk assessment . 22
5.3 Tolerable risk R . 22
T
5.4 Specific procedure to evaluate the need of protection . 22
5.5 Procedure to evaluate the cost effectiveness of protection . 23
5.6 Protection measures . 26
5.7 Selection of protection measures . 26
6 Assessment of risk components . 26
6.1 Basic equation . 26
6.2 Assessment of risk components due to flashes to the structure (S1) . 27
6.3 Assessment of the risk component due to flashes near the structure (S2) . 27
6.4 Assessment of risk components due to flashes to a line connected to the structure
(S3) . 27
6.5 Assessment of risk component due to flashes near a line connected to the
structure (S4) . 28
6.6 Summary of risk components . 29
6.7 Partitioning of a structure in zones Z . 29
S
6.8 Partitioning of a line into sections S . 30
L
6.9 Assessment of risk components in a structure with zones Z . 30
S
6.10 Cost-benefit analysis for economic loss (L4) . 31
Annex A (informative) Assessment of annual number N of dangerous events . 32
A.1 General . 32
A.2 Assessment of the average annual number of dangerous events N due to flashes
D
to a structure and N to an adjacent structure . 32
DJ
A.3 Assessment of the average annual number of dangerous events N due to
M
flashes near a structure . 37
A.4 Assessment of the average annual number of dangerous events N due to flashes
L
to a line. 38
A.5 Assessment of average annual number of dangerous events N due to flashes
I
near a line. 39
Annex B (informative) Assessment of probability P of damage . 40
X
B.1 General . 40
B.2 Probability P that a flash to a structure will cause injury to living beings by
A
electric shock . 40
B.3 Probability P that a flash to a structure will cause physical damage . 41
B
– 3 – EN 62305-2:2012
B.4 Probability P that a flash to a structure will cause failure of internal systems . 41
C
B.5 Probability P that a flash near a structure will cause failure of internal systems . 43
M
B.6 Probability P that a flash to a line will cause injury to living beings by electric
U
shock . 44
B.7 Probability P that a flash to a line will cause physical damage . 45
V
B.8 Probability P that a flash to a line will cause failure of internal systems . 46
W
B.9 Probability P that a lightning flash near an incoming line will cause failure of
Z
internal systems . 46
Annex C (informative) Assessment of amount of loss L . 48
X
C.1 General . 48
C.2 Mean relative amount of loss per dangerous event . 48
C.3 Loss of human life (L1) . 48
C.4 Unacceptable loss of service to the public (L2) . 51
C.5 Loss of irreplaceable cultural heritage (L3) . 52
C.6 Economic loss (L4) . 53
Annex D (informative) Evaluation of costs of loss . 56
Annex E (informative) Case study . 57
E.1 General . 57
E.2 Country house . 57
E.3 Office building . 62
E.4 Hospital . 69
E.5 Apartment block . 80
Bibliography . 85
Figures
Figure 1 – Procedure for deciding the need of protection and for selecting protection
measures . 24
Figure 2 – Procedure for evaluating the cost-effectiveness of protection measures . 25
Figure A.1 – Collection area A of an isolated structure . 33
D
Figure A.2 – Complex shaped structure . 34
Figure A.3 – Different methods to determine the collection area for the given structure . 35
Figure A.4 – Structure to be considered for evaluation of collection area A . 36
D
Figure A.5 – Collection areas (A , A , A , A ) . 39
D M I L
Figure E.1 – Country house . 57
Figure E.2 – Office building . 62
Figure E.3 – Hospital . 69
Figure E.4 – Apartment block . 81
Tables
Table 1 – Sources of damage, types of damage and types of loss according to the point of
strike . 18
Table 2 – Risk components to be considered for each type of loss in a structure . 20
Table 3 – Factors influencing the risk components . 21
Table 4 – Typical values of tolerable risk R . 22
T
Table 5 – Parameters relevant to the assessment of risk components . 28
Table 6 – Risk components for different types of damage and source of damage . 29
Table A.1 – Structure location factor C . 37
D
Table A.2 – Line installation factor C . 38
I
Table A.3 – Line type factor C . 38
T
Table A.4 – Line environmental factor C . 38
E
Table B.1 – Values of probability P that a flash to a structure will cause shock to living
TA
beings due to dangerous touch and step voltages . 40
Table B.2 – Values of probability P depending on the protection measures to reduce
B
physical damage . 41
Table B.3 – Value of the probability P as a function of LPL for which SPDs are designed42
SPD
Table B.4 – Values of factors C and C depending on shielding, grounding and isolation
LD LI
c o n d i t i o n s . 42
Table B.5 – Value of factor K depending on internal wiring . 44
S3
Table B.6 – Values of probability P that a flash to an entering line will cause shock to
TU
living beings due to dangerous touch voltages . 45
Table B.7 – Value of the probability P as a function of LPL fo
...