BS EN 62305-1:2011 Part 1:
General principles
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1 - BS EN 62305 General Principles
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Introduction to
BS EN 62305
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BS EN 62305:- History
 CP326 – 1965 introduced the theory of an angle of protection
 BS 6651 - 1985 British Standard for Lightning Protection for years
 BS EN 62305:2006
– new European Lightning Protection standard came into use in
the UK in August 2006.
– ran in parallel with BS6651 until 31st August 2008 when the old
standard was completely withdrawn
 BS EN 62305:2011
– Parts 1,3 & 4 updated in 2011, part 2 updated in 2012
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1 - BS EN 62305 General Principles
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BS EN 62305 Layout
62305-1
General Principles
62305-2
Risk Management
62305-3
Physical damage
and life hazard
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62305-4
Electrical and
electronic systems
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Document sizes BS 6651 / BS EN 62305: 2011
BS6651
Code of Practice for protection
of structures against lightning
140 Pages
BSEN 62305-1
General Principles
70 Pages
BSEN 62305-2
Risk Management
144 Pages
BSEN 62305-3
Physical Damage to
Structures and Life Hazard
160 Pages
BSEN 62305-4
Electrical and Electronic
Systems
( BS6651 – annex C – Surge Protection 36 Pages )
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1 - BS EN 62305 General Principles
89 Pages
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Differences between IEC 62305, EN 62305 and
BS EN 62305
 Both sets of documents derived from the base standard IEC 62305
 When IEC 62305 was voted on by the European committees it was
accepted and became a European norm EN 62305
 All countries working to the EN abide by the majority of the content
of the IEC documents but are allowed local variations that reflect any
major differences within the specific country
 BS EN relects differences experienced within the UK and has country
specific risk levels
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Insurance Industry Details
EU Regional Insurance Claims
19%
Lightning Related
50%
31%
1st Qtr
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2nd Qtr
Confirmed ‘other’
3rd Qtr
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BS EN 62305-1
General Principles
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BS EN 62305-1
General Principles
 Introduction to the BS EN 62305 set of documents.
 Describes each document and its relationship to the other
documents in the series.
 Introduces fundamental principles:– Source of Damage and Loss in a structure
– Lightning Protection Levels and Parameters
– Lightning Protection Zones (LPZ)
– Parameters of lighting current
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BS EN 62305-2
Risk Management
 Complex document embracing many more factors than the BS6651
risk assessment.
 By working through a series of formulae the process assists the user
in deciding what protection is required. The actual risk (RA) must be
below the tolerable level (RT).
 Depending upon the calculated risk values the protective
requirements may be the installation of a LPS system and /or Direct
lightning current arresters against LEMP and Surge arresters against
SEMP.
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Risk components
Risk
Current
Water
Gas
Human life
Service to the public
Cultural heritage
Economic loss
R1
R2
R3
R4
Each risk consists of several risk components
=
R1 = RA+ RB+ RC
+ RM+ RU+
RV+ RW+ RZ
=
R2 = RB+ RC+
RM+ RV +
RW+RZ
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=
=
R3 = RB+ RV
1 - BS EN 62305 General Principles
R4 = RA+ RB+ RC
+ RM+ RU+
RV+ RW+ RZ
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BS EN 62305-3
Physical damage to structures and life hazard
 External Lightning Protection System:-
– Air-Termination and earth termination systems
– Down conductor systems – Isolated and non Isolated
– Components, dimensions and fixings
 Internal Lightning Protection System:– Lightning equipotential bonding
– Electrical insulation of the LPS using separation distance
 Maintenance of LPS and prevention of touch and step voltages
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Design methods for air-termination systems
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BS EN 62305-4
Electrical and electronic systems within structures
 Design and installation of SPM (Surge Protection Measures)
 Earthing and bonding
 Magnetic shielding and line routing
 Co-ordinated SPD system
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Surge protection for electrical and electronic systems
Type 3
Type 2
SDB
> 10 m
DEHNguard M
 10 m terminal
device
> 10 m
DEHNrail
DEHNguard M
> 10 m
MDB
DEHNventil M
terminal
device
Type 3
Type 1-2-3
power network
terminal
device
Type 3
Type 2
SDB
DEHNsafe
 10 m
terminal
device
DEHNflex
terminal
device
MDB main distribution board
SDB sub distribution board
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(AH 30.07.13 / 8350_E_1)