(c) least copper plating with 99. alu-
minium round conductors arrestors and copper-
/steel earthing material.g. steel earth and concrete.7 Materials and corrosion protec-
tion
The following materials are preferred for use extern-
al lightning protection systems: Hot galvanised steel,
rustproof steel, copper and aluminium.g. can also occur when a
single type metal embedded two distinct envir-
onments, e.5 mm
Rustproof steel (a)
Strip solid 2.
Material Form Minimum dimensions
Copper, tin-plated copper
Strip solid 2.
Causes corrosion
Corrosion occurs when different metals are connected
with one another soil, water molten salt, e.TBS
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2.5 mm
Round, solid (b) mm
Cable (b) mm²
Round, solid mm
Aluminium
Round, solid mm
Cable mm²
Copper-coated aluminium alloy Round, solid (c) mm
Aluminium alloy
Strip solid 2.5 mm
Round, solid mm
Cable (b) mm²
Round, solid (d) mm
(a) Chromium 16%; Nickel 8%; Carbon 0.08%
(b) Diameter can certain applications reduced mm2
(diameter mm) mechanical resistance not primary criterion.27: Material, form and minimum dimensions air-termination cables, air-termination rods, earth entry rods
and conductors
TBS
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169
Chapter The external lightning protection system
. All metals in
direct contact with the ground water can corrode
due stray current aggressive soils. Corrosion is
when metal material reacts with its surroundings to
the detriment the material’s properties.5 mm
Round, solid mm
Cable (b) mm²
Round, solid mm
Copper-coated steel (c)
Round, solid mm
Strip solid 2.5 mm
Round, solid mm
Cable (b) mm²
Round, solid mm
Hot galvanised steel
Strip solid 2.9% copper content
(d) Can used for air-termination rods and base
Table 2.
The minimum cross-sections,
shape and material depend the
appropriate application
