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Section 10
9
How to implement a surge
arrester system
Lightning
protection
Estimate the value of the equipment to be protected
To estimate its value, consider:
b
b
The cost of the equipment in financial terms
b
b
The economic impact if the equipment goes down
b
b
Domestic equipment:
v
v
Audio-video, computers
v
v
Household appliances
v
v
Burglar alarm
b
b
Sensitive equipment:
v
v
Burglar alarm
v
v
Fire alarm
v
v
Access control
v
v
Video surveillance
b
b
Building equipment:
v
v
Automated heating or air-conditioning
v
v
Lift
b
b
Professional equipment:
v
v
Programmable machine
v
v
Computer server
v
v
Sound or light control system
b
b
Heavy equipment:
v
v
Medical infrastructure
v
v
Production infrastructure
v
v
Heavy computer processing
Determine the electrical architecture of buildings
Lightning protection can be calculated for an entire building or for part of a building that is electrically
independent
Depending on the size of the building and the extent of its electrical system, one or more surge arresters must be
used in the various switchboards in the installation.
b
b
Detached house
b
b
Apartment, small semi-detached house
b
b
Communal part of a building
b
b
Professional premises
b
b
Tertiary and industrial buildings:
v
v
Single switchboard, main switchboard
v
v
Distribution board
v
v
Sensitive equipment more than 30 m from the switchboard
Understand the risk of the impact of lightning on the site
Lightning is attracted by high points that conduct electricity. They can be:
b
b
Natural: tall trees, mountain crest, wet areas, ferrous soil
b
b
Artificial: chimney, aerial, pylon, lightning conductor
Indirect effects can be incurred within a fifty metre radius around the point of impact.
Location of the building
b
b
In an urban, peri-urban, grouped
housing area
b
b
In an area where there is a particular
hazard (pylon, tree, mountainous region,
mountain crest, wet area or pond)
b
b
In flat open country
b
b
In an exceptionally exposed area
(lightning conductor on a building less
than 50 metres away)
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