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Structure of IEC/BS EN 62305
The IEC/BS EN 62305 series consists of four parts, all of
which need to be taken into consideration. These four parts
are outlined opposite:
Part 1: General principles
IEC/BS EN 62305-1 (part 1) is an introduction to the other
parts of the standard and essentially describes how to design
a Lightning Protection System (LPS) in accordance with
the accompanying parts of the standard.
Part 2: Risk management
IEC/BS EN 62305-2 (part 2) risk management approach, does
not concentrate so much on the purely physical damage to
a structure caused by a lightning discharge, but more on the
risk of loss of human life (including permanent injury), loss
of service to the public, loss of cultural heritage and
economic loss.
Part 3: Physical damage to structures and life hazard
IEC/BS EN 62305-3 (part 3) relates directly to the major part
of BS 6651. It differs from BS 6651 in as much that this
new part has four Classes or protection levels of LPS, as
opposed to the basic two (ordinary and high-risk) levels
in BS 6651.
Part 4: Electrical and electronic systems
within structures
IEC/BS EN 62305-4 (part 4) covers the protection of
electrical and electronic systems housed within
structures. It embodies what Annex C in BS 6651
conveyed, but with a new zonal approach referred to as
Lightning Protection Zones (LPZs). It provides information
for the design, installation, maintenance and testing of a
Lightning Electromagnetic Impulse (LEMP) protection system
(now referred to as Surge Protection Measures - SPM) for
electrical/electronic systems within a structure.
Figure 2. Structure of IEC/BS EN 62305
General
Principles
IEC/BS EN 62305-1
Risk
Management
IEC/BS EN 62305-2
Protection of
the Structure
IEC/BS EN 62305-3
Electronic Systems
Protection
IEC/BS EN 62305-3